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公开(公告)号：US4445478A
公开(公告)日：1984-05-01
申请号：US479798
申请日：1983-03-28
Applicant: Tsutomu Momoyama
Inventor： Tsutomu Momoyama
Abstract: What is disclosed is an ignition timing control system for internal combustion engine wherein an angular signal is generated at a predetermined crank position. This angular signal is fed into an integrator which is made operative to repeat its charging and discharging cycles with a constant current so as to provide an output which is retarded or advanced of the crank position in accordance with the rise and fall of the r.p.m. of the engine.
Abstract translation: 所公开的是用于内燃机的点火正时控制系统，其中在预定的曲柄位置处产生角度信号。 该角度信号被馈送到积分器，该积分器用于以恒定电流重复其充电和放电循环，以便根据r.p.m的上升和下降来提供延迟或提前的曲柄位置的输出。 的发动机。
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2.发明授权Apparatus for the adjustment of a quantity-metering member of a fuel injection pump 失效用于调节燃料喷射泵的计量部件的装置
公开(公告)号：US4357920A
公开(公告)日：1982-11-09
申请号：US230180
申请日：1981-01-30
Applicant: Gerhard Stumpp , Wolf Wessel , Ulrich Flaig , Fridolin Piwonka , Ludwig Walz
Inventor： Gerhard Stumpp , Wolf Wessel , Ulrich Flaig , Fridolin Piwonka , Ludwig Walz
CPC classification number: F02D41/407 , F02D2250/38 , Y02T10/44
Abstract: A device is proposed for the adjustment of a quantity-metering member of a fuel injection pump in an internal combustion engine with self-ignition, comprising an electric circuit arrangement for a control signal dependent on operating parameters, this signal inffluencing the position of the quantity-metering member via an electromagnetic servo unit wherein the electric circuit arrangement includes at least one series circuit made up of a minimum value selection stage, a maximum value selection stage, and a servo unit controller for the quantity-metering member and the output signals of at least two set-point stages for, in particular, the speed, the smoke limit, equalization, and exhaust gas temperature can be fed to the minimum value selection stage with the maximum value selection stage additionally coupled to a start control stage. In addition to the use of the device as a total controller, i.e., the electric circuit arrangement alone determines the position of the quantity-metering member and no mechanical controller is additionally provided, the device can also be utilized where only a regulated stop for the quantity-metering member, for example a control rod, is present as the control member ("signal mixing"). The purpose of the proposed device is to furnish an electronic speed regulation for idling and for intermediate speeds, beyond the quantity-limiting functions of equalization (limitation of the injection only in dependence on the speed), smoke limit, and exhaust gas temperature limit, in case of a total controller as well as in case of signal mixing with the aid of a controlled servo unit, so that the speed is maintained constant at the preset and/or desired value even in an unstable condition during varying loads, for example, due to the additional connection of auxiliary units.
Abstract translation: 提出了一种用于调节具有自点火的内燃机中的燃料喷射泵的量计量构件的装置，其包括用于根据操作参数的控制信号的电路装置，该信号不影响量的位置 测量部件，其中电路装置包括至少一个串联电路，该串联电路由最小值选择级，最大值选择级和用于计量部件的伺服单元控制器组成，并且输出信号 至少两个设定点，特别是速度，烟雾限制，均衡和废气温度可以被馈送到最小值选择级，其中最大值选择级另外耦合到启动控制级。 除了使用该装置作为总控制器，即单独的电路装置确定计量部件的位置，并且不另外提供机械控制器，所以该装置也可以用于仅用于 作为控制部件（“信号混合”）存在计量部件，例如控制棒。 所提出的装置的目的是提供一种用于怠速和中等速度的电子速度调节，超出均衡量的限制功能（仅根据速度限制注射），烟雾限制和废气温度限制， 在总控制器的情况下，以及在受控伺服单元的帮助下信号混合的情况下，即使在变化的负载期间的不稳定状态下，速度也保持恒定在预设和/或期望值，例如， 由于辅助单元的附加连接。
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公开(公告)号：US4322800A
公开(公告)日：1982-03-30
申请号：US136331
申请日：1980-04-01
Applicant: Takashi Hisegawa , Osamu Ito , Nobuhito Hobo , Yoshihiko Tsuzuki , Yutaka Suzuki , Mikio Kumano , Masaharu Sumiyoshi
Inventor： Takashi Hisegawa , Osamu Ito , Nobuhito Hobo , Yoshihiko Tsuzuki , Yutaka Suzuki , Mikio Kumano , Masaharu Sumiyoshi
Abstract: An optimum control method for internal combustion engines uses the values of an engine control variable, such as engine timing, which are arranged in a map and stored in a memory. During normal operation, the engine is operated in accordance with one of the mapped engine control variable values related to engine operating conditions. During a fuel consumption minimization operation, the mapped engine control variable value is changed by an incremented amount to operate the engine therewith, and the mapped engine control variable value is replaced by the changed engine control variable value, if it is detected that the change by the incremented amount is in a direction to reduce the fuel consumption rate of the engine. This optimum engine control method can compensate for changes in the characteristics of engines caused during the manufacture or caused by changes over time during their operation, thereby ensuring the operation of an engine at a minimum rate of fuel consumption.
Abstract translation: 用于内燃机的最佳控制方法使用布置在地图中并存储在存储器中的诸如发动机定时的发动机控制变量的值。 在正常操作期间，发动机根据与发动机操作条件相关的映射发动机控制变量值之一进行操作。 在燃料消耗最小化操作期间，映射的发动机控制变量值被改变一个递增的量以与发动机一起操作，并且如果检测到变化的发动机控制变量值被改变 增加的量是减小发动机的燃料消耗率的方向。 这种最佳的发动机控制方法可以补偿在制造期间引起的发动机特性的变化或由其在操作期间随着时间的变化而引起的发动机的特性的变化，从而确保发动机在最小燃料消耗率下的操作。
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公开(公告)号：US4241709A
公开(公告)日：1980-12-30
申请号：US32501
申请日：1979-04-23
Applicant: Klaus Schellmann , Heinz Schulze
Inventor： Klaus Schellmann , Heinz Schulze
CPC classification number: F02P5/142
Abstract: A device for the adjustment of the ignition time of an internal combustion engine as a function of the vacuum in the intake line which is provided with a flow regulator in the form of a throttle valve or the like.
Abstract translation: 一种用于调节内燃机的点火时间的装置，其作为进气管线中的真空的函数，该装置设置有节流阀等形式的流量调节器。
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5.发明授权Simplified method and apparatus for assuring periodic control of the timing of an internal combustion engine 失效用于确保内燃机的定时的周期性控制的简化方法和装置
公开(公告)号：US4164204A
公开(公告)日：1979-08-14
申请号：US714138
申请日：1976-08-13
Applicant: Serge Guipaud
Inventor： Serge Guipaud
CPC classification number: F02P5/1555 , F02B2075/027 , Y02T10/46
Abstract: Method and apparatus for periodically controlling the timing of an internal combustion engine in which two voltages are generated, one of which corresponds to a selected portion of one complete rotation of the engine shaft whereas the other is a function of time. A control signal is generated when the second voltage becomes equal to the first. The first voltage is of the form aq+b+ce.sup. -.gamma.q, in which a, b, and c may be any constants and .gamma. is a positive constant, while the second voltage is of the form d+ ge.sup. -.alpha.t, in which d and g may be any constants and .alpha. is a positive constant. SUMMARY OF THE INVENTIONIt is known to be necessary in order to insure the satisfactory operation of a reciprocating internal combustion motor, such as the motor of an automotive vehicle, for example, to ignite the combustible gas in advance of the moment at which the piston reaches the top dead center point in the cylinder in question. In devices of a conventional type, the ignition is advanced by means of a centrifugal advance device and by means of a vacuum operated advance device, these two devices constituting mechanical controls which determine the relative position of a cam and a switch, the cam being driven in rotation by the motor and the switch being inserted in the primary circuit of an ignition coil. In this type of apparatus the presence of several mechanical parts is a by no means negligible cause of engine trouble and, moreover, rapid opening and closing of the switches leads to a progressive deterioration of their contacts during use, so that good operation requires frequent maintenance.In order to avoid the disadvantages resulting from the use of a switch it has already been proposed, for example in applicant's U.S. Pat. Application Ser. No. 562,844, filed Mar. 27, 1975, U.S. Pat. No. 4,066,968, to provide analogous devices making it possible to control the timing of an internal combustion engine by utilizing only electronic components, thus eliminating the mechanical devices customarily required. These electronic component devices make it possible to initiate the ignition with an advance the representative curve of which is a straight line, as a function of the speed of rotation. When the advance curve takes the form of a succession of connected straight line segments, it is necessary either to provide a relatively complex speed discriminating circuit to select those of the electronic circuits which should be used in the speed zone in which one is operating, or utilize a group of circuits functioning simultaneously, one of which is selected by comparison on the assumption that the advancement curve is a monotone or straight line in the working interval. These prior art electronic devices work on the principle of comparing two voltages, the first of which is a linear function of the inverse of the speed of rotation of the motor with which the device is associated, and the second is a linear function of time. This comparison makes it possible to generate a control signal which results in producing, for the ignition of the internal combustion motor of an automotive vehicle, a linear curve of ignition advancement as a function of the speed of rotation. This linearity, as has been explained above, makes it necessary, in order to obtain a curve consisting of several different straight segments, to add a certain number of electronic components to the circuits generating the first and second voltages, so as to permit a change in straight segments when shifting from one range of speeds of rotation to another range of speeds of rotation.It is the object of the present invention to provide an analog electronic device which makes it possible to obtain an ignition advance curve as a function of the speed of rotation which has a finite radius of curvature which differs in dependence on the points of the curve. In this way it is possible, over the entire range of rotational speeds which must be taken into consideration, to obtain a single curve by comparing two voltages, one of which is a function of the inverse of the speed of rotation and the other of which is a function of time. It is thus no longer necessary to have available supplementary electronic components for changing the straight curve segment in dependence on the portion of the total operating range within which one is working, as is the case in the devices of the prior art. This results not only in a simplification of the electronic device and consequently a decrease in its cost, but also in an improved response to the needs of the motors.The device according to the invention receives information from a certain number of sensors, and in particular from a speed detector, which indicates the speed of rotation of a shaft which, in the case of a control for the ignition of an internal combustion motor, may be a shaft connected to the crankshaft or cam shaft of the motor. The device according to the invention is an analog assembly which transforms the information received into control signals which are supplied either to the ignition coil or to other means controlled by the device from, for example, a fuel pump, a starter, a fuel injection device, a carburetor, an air pump, or an automatic transmission. It will be appreciated that this list of possible applications is representative and not exhaustive.In accordance with the invention at least one of the two voltages compared is an asymptotic exponential function which may be simply provided by the charging or discharging of a circuit comprising a condenser and a resistance. It has already been proposed in the prior art that, in order to control the ignition of an internal combustion motor, two voltages be compared, one of which is an exponential function of time and the other of which is proportional to the speed of rotation of the shaft of the motor (see the article by B. J. Hoetink, in the Dutch Review, "de Ingenieur", Volume 76, No. 22, pages W95 to W99). However, this prior art device is not satisfactory because the curve which represents the ignition advance as a function of the speed of rotation is an exponential asymptotic curve in which the position of the asymptote is a function of the structure of the sensor for the speed of rotation which is used. It follows that, for a given sensor, the position of the asymptote is determined, which makes it impossible to modify the curve as a function of the values of parameters other than the speed of rotation and, in particular, as a function of the vacuum. On the contrary, the device according to the invention makes it possible to obtain an ignition advance the curve of which, as a function of the speed of rotation, is an exponential asymptotic curve, the position of the asymptote being essentially a function of the characteristics of the electronic circuits used and, in particular, of the value of the resistances and the capacitances which are included in the circuits generating the exponential voltages compared. It follows that one may easily introduce parameters other than the speed of rotation of the motor and, in particular, the value of a vacuum, so as to modify the ignition advance curve obtained, by simply changing the value of a resistance or a capacitor.It is therefore an object of the present invention to provide a process for insuring the periodic control of at least one function dependent upon one or more parameters, and in particular, on the speed of rotation of a shaft, which control must be initiated with a phase displacement with respect to the instant of passage of an indicator connected to the shaft before a stationary mark, the displacement being a function of the speed of rotation of the shaft. In this process a signal P is generated, the duration q of which corresponds to passage of a rotating sector having a constant angle .phi. in front of a stationary mark, the angle (2.pi.-.phi.) corresponding to the absence of this signal for a time q. A complementary signal P may be generated throughout the period q. After having generated a signal P, there is generated, during a subsequent period q or q, a first voltage which is a function of q. During one of the subsequent periods q, a second voltage is generated as a function of the time t from the beginning of the period q of the signal P under consideration. A control signal is generated when the second of the aforesaid voltages becomes equal to the first, said control signal being used to initiate the control step in question. The process is characterized by the fact that the first voltage is of the form q+b+ce.sup. -.gamma.q ; a, b and c being any constants and .gamma. being a positive constant, and that the second voltage is of the form d+ge.sup. -.alpha.t, d and g being any constants and .alpha. being a positive constant.In a preferred embodiment of the process according to the invention the first voltage is generated during the period q following a period q of the signal P. This first voltage is stored and the second voltage is generated during the following period q. The second voltage is generated at the terminals of a condenser which is charged through a charging resistance. In a simple and advantageous embodiment, the first voltage is a linear function of q. In this case the first voltage is obtained by utilizing an integrator which operates during the period of the signal P or P. The return to the initial state of the first and second voltages preferably occurs at the moment at which the trailing edge of the signal P occurs. In the case in which it is desired to utilize parameters other than the speed of rotation of the shaft, for example the value of the vacuum in an intake line, the characteristics of the components of the circuits permitting the generation of the first and/or second voltage are modified as a function of the parameter to be used.The value of the process according to the invention comes from the fact that the electronic circuits making it possible to generate the first and second voltages which are to be compared are particularly simple since the linear functions may be generated without difficulty by means of an integrator and the asymptotic exponential functions may be generated without difficulty by charging a condenser.If this process is used for the ignition of an internal combustion motor it is arranged so that the top dead point corresponds to the end of the passage of the sector having an angle of rotation .phi. is in front of the stationary mark associated therewith, that is to say, at the end of the signal P. The time t.sub.o at which equality between the first and second voltages occurs is counted, beginning with the beginning of the signal P and the ignition advance is thus equal to the difference between the duration of the signal P and the time t.sub.o. If the angular rotation of the shaft is equated to time by designating by N the angular speed of rotation expressed in revolutions per minute, one may write ##EQU1## a formula in which .theta. represents the advance of the ignition in degrees, .phi. is in degrees, N is in RPM, and the quantity ##EQU2## so that t.sub.o is in seconds.It will, moreover, be seen that, if the second voltage never becomes equal to the first, and the ignition is fired at the end of the signal P, there is no advance of the ignition. If an initial setting is desired in which there is an advance or a lag in firing, it suffices to displace the rotating angular sector of the sensor with respect to the fixed mark so that the end of the passage of the rotating sector by the fixed mark is angularly displaced with respect to the top dead point.Taking into account the form of the equations representing the first and second voltage and allowing, on the other hand, for the relationship, above indicated, which exists between .theta. and t.sub.o, it may be easily deduced that, when the ignition is fired because the first and second voltages have become equal, the expression of .theta. as a function of N is of the form: .theta.=.phi.+KN Log (1+(A/N)+Be.sup.-.beta./N). In this formula K, A, B and .beta. are constants which are essentially a function of the characteristics of the components of the electronic circuits which generate the first and second voltages. One may therefore, for example, by adjusting the value of a resistance, modify the ignition curve obtained as a function of the value of a parameter such as the vacuum in the intake line of the motor.A further object of the present invention is to provide the new article of manufcture which consists of a device adapted to carry out the above defined process and particularly adapted to assure the timing of the ignition of a reciprocating internal combustion motor with respect to the top dead point of the stroke of each piston, said device comprising a stationary sensor which cooperates with a rotating sector having the angle .phi. and associated with the shaft, the speed of rotation of which determines the command to fire, said sensor supplying, during the passage of the sector having the angle .phi. aforesaid, a signal P of duration q, characterized by the fact that it comprises, in the first place, a circuit which generates a first voltage of the form aq+ b+ce.sup.-.gamma.q ; a, b, and c being any constants and .gamma. a positive constant; in the second place, a circuit which generates a second voltage of the form d+ge.sup. -.alpha.t, in which formula d and g are any constants, .alpha. is a positive constant and t represents the time counted from the beginning of the signal P; and, in the third place, a comparator supplied by the two above circuits and capable of generating a control signal when the second voltage becomes equal to the first voltage.When the second voltage does not become equal to the first voltage before the end of the signal P during which it is generated and when it is desired to initiate the control signal at the moment at which the signal P ends, the output of the comparator and the signal P is connected to an OR gate permitting the delivery of a control signal.In a preferred embodiment of the invention the control signal emitted at the moment at which ignition must occur is supplied to the input of a monostable, the output of which controls two transistors associated in a "Darlington" pair, said pair making it possible to cut off the supply to the primary coil of the ignition coil associated with the device at the moment at which emission of the control signal takes place. When the first voltage is a linear function of q, that is to say in the case in which c=o, the circuit generating the first voltage is an integrator functioning for the duration of the signal P, the output voltage of said integrator being maintained during the following signal P by means of a condenser connected between an input and the output of the integrator. The output voltage of the integrator is returned to zero by supplying a reverse voltage pulse to the integrator input connected to the condenser at the moment at which the trailing edge of the signal P occurs. This pulse is provided by a monostable multivibrator in response to the trailing edge of the signal P. The integrator, which generates the first voltage, has its input other than the one which is connected to the condenser supplied during the signal P and connected to ground during the signal P through a transistor. The circuit generating the second voltage consists of a condenser associated with a charging resistance. The charging resistance of the circuit generating the second voltage is continuously or discontinuously modified as a function of the value of a parameter such as the vacuum in the intake line of the motor which is associated with the device.
Abstract translation: 用于周期性地控制其中产生两个电压的内燃机的定时的方法和装置，其中一个对应于发动机轴的一个完整旋转的选定部分，而另一个是时间的函数。 当第二电压变为等于第一电压时，产生控制信号。 第一电压为aq + b + ce-gamma q形式，其中a，b和c可以是任何常数，γ是正常数，而第二电压为d + ge-αt，形式为 其中d和g可以是任何常数，α是正常数。
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Patent Agency Ranking
公开(公告)号：US4121553A
公开(公告)日：1978-10-24
申请号：US766617
申请日：1977-02-07
Applicant: Takashi Hasegawa
Inventor： Takashi Hasegawa
Abstract: An electric ignition advance system for internal combustion engines wherein an ignition timing to be advanced in accordance with a scheduled pattern is determined digitally. Advance pattern voltage generators generate voltage signals depending on engine operation parameters such as engine rotational speed or engine intake vacuum and hence the voltage signals represent scheduled advance pattern voltages. The voltage signal, i.e., the advance pattern voltages are combined and the resultant signal is converted into a frequency signal. The frequency signal is counted by a digital ignition timing determination circuit with respect to a reference ignition signal supplied from, e.g. a distributor. When the digital ignition timing determination circuit counts a predetermined number of the frequency signals, it provides an ignition signal.
Abstract translation: 一种用于内燃机的电动点火提前系统，其中根据预定模式进行的点火正时数字地确定。 先进模式电压发生器根据诸如发动机转速或发动机进气真空度的发动机操作参数产生电压信号，因此电压信号表示调度的提前模式电压。 电压信号，即提前图形电压被组合，并将所得到的信号转换成频率信号。 频率信号由数字点火正时确定电路相对于从例如电源提供的参考点火信号进行计数。 经销商。 当数字点火正时确定电路对预定数量的频率信号进行计数时，它提供点火信号。
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公开(公告)号：US4063538A
公开(公告)日：1977-12-20
申请号：US657443
申请日：1976-02-12
Applicant: John David Powell , Mont Hubbard , Robert R. Clappier
Inventor： John David Powell , Mont Hubbard , Robert R. Clappier
CPC classification number: F02P5/1455 , F02B1/04 , Y02T10/46
Abstract: A method and apparatus for controlling the ignition timing in an internal combustion engine. The angular position of peak cylinder pressure is measured and to the extent such angular position deviates from a preselected set point, the time of spark ignition is advanced or retarded to restore the position of peak cylinder pressure to the set point.
Abstract translation: 一种用于控制内燃机中的点火正时的方法和装置。 测量峰值气缸压力的角位置，并且在这种角度位置偏离预选设定点的程度上，火花点火的时间提前或延迟，以恢复峰值气缸压力到设定点的位置。
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公开(公告)号：US4024458A
公开(公告)日：1977-05-17
申请号：US696411
申请日：1976-06-15
Applicant: Jackson R. Templin
Inventor： Jackson R. Templin
CPC classification number: F02P7/061 , G01M15/06 , G01P13/045 , G01P3/488 , H02K21/44
Abstract: Two phase displaced alternating current wave forms are generated by a magnetic pickup arrangement including two each split pole tips in magnetic circuit relationship with a rotatable toothed disk and structure for changing the phase relationship of each of the generated wave forms at predetermined intervals, the pole tips being mechanically separated from each other about the periphery of the disk by a distance determined by the desired wave form phase displacement and the desired duration of a periodic system output signal. Auxiliary alternating current wave forms are produced from the generated wave forms to provide a plurality of equally phase displaced alternating current wave forms and all are converted to square wave forms. A gating circuit combination initiates and terminates the system periodic output signal upon alternate changes of phase relationship of the generated wave forms and other gating circuit combination combines the squared generated and auxiliary wave forms to produce a series of other system output signal pulses of a frequency which is a multiple of the frequency of the generated and auxiliary alternating current wave forms as determined by the total number thereof.
Abstract translation: 两相移位交流电波形成由磁拾取装置产生，该磁拾取装置包括两个与可旋转的齿盘的磁路关系的每个分极柱，以及用于以预定间隔改变每个所产生的波形的相位关系的结构， 在围绕磁盘的周边彼此机械地分离由所需波形相位位移和周期性系统输出信号的期望持续时间确定的距离。 从产生的波形产生辅助交流波形，以提供多个等相移位的交流波形，并且都转换成方波形。 选通电路组合在产生的波形和其他门控电路组合的相位关系的交替变化时启动和终止系统周期性输出信号，其组合平方生成和辅助波形以产生一系列其它系统输出信号脉冲，其频率为 是由其总数确定的生成和辅助交流电波形式的频率的倍数。
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公开(公告)号：US3927648A
公开(公告)日：1975-12-23
申请号：US47627274
申请日：1974-06-04
Applicant: NIPPON SOKEN
Inventor： KAWAI HISASI , IWASE KAZUO
Abstract: There is provided a digital electronic ignition timing control circuit for an internal combustion engine wherein a retard angle from the reference angular position of the engine which corresponds to the number of revolutions of the engine and the vacuum within the engine intake manifold is read out from a predetermined program, the retard angle thus read out is converted, in terms of a frequency which varies with a predetermined functional relationship, into a delay time from the moment at which the rotation of the engine passes the reference angular position, the frequency corresponding to the delay time is counted by a counter, and the expiration of the delay time from the moment of passing the reference angular position is computed in accordance with the count of the counter to determine the timing of the ignition. Thus, the system of this invention is free from deterioration with age, capable of timing the ignition of an engine with very high accuracy, capable of readily obtaining a different ignition timing characteristic by changing the program, is requiring no complicate computing circuitry, eliminates the computing time for an electronic ignition system through the use of a digital system and hence is superior in response characteristic.
Abstract translation: 提供了一种用于内燃机的数字电子点火正时控制电路，其中从发动机的参考角位置的发动机的延迟角对应于发动机的转数和发动机进气歧管内的真空从 将由此读出的延迟角按照预定的功能关系变化的频率转换成从发动机的转动通过参考角位置的时刻起的延迟时间，对应于 通过计数器计数延迟时间，并且根据计数器的计数来计算从通过参考角位置的时刻起的延迟时间的到期以确定点火的定时。 因此，本发明的系统不会因年龄而变差，能够以非常高的精度对发动机的点火进行定时，能够通过改变程序容易地获得不同的点火时间特性，不需要复杂的计算电路，消除了 通过使用数字系统的电子点火系统的计算时间，因此具有优异的响应特性。
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10.发明授权
公开(公告)号：US3871342A
公开(公告)日：1975-03-18
申请号：US44590274
申请日：1974-02-26
Applicant: NIPPON SOKEN
Inventor： FUJINAMI HIROSHI , TAKAGI KATUYUKI
CPC classification number: G06F7/62 , F02P5/1502 , F02P5/151 , G06F7/602 , Y02T10/46
Abstract: There is provided a control circuit for electrically determining the ignition timing of an internal combustion engine. The most common type of the conventional spark-advance mechanisms is one in which the relative positions of a cam and contact points constituting a cam and electric contact assembly are varied in accordance with the number of revolutions of the engine and the magnitude of the intake manifold vacuum respectively detected by a centrifugal governor and a vacuum advancer to generate an ignition signal at an ignition point that suits the operating conditions of the engine. However, the spark-advance mechanism of this type is disadvantageous in that the wear of the cam and the contact points results in the alteration of the ignition timing, and moreover it is difficult to design the mechanism to provide a variety of ignition timing characteristics. According to the present invention, a certain angular position of the crankshaft of an engine is taken as a reference point, and the retard angles from this reference positions are preliminarily programmed in accordance with variations in the number of revolutions of the engine and manifold vacuum, whereby in accordance with the conditions of the engine the corresponding retard angle is read out from the programs and it is then converted into the equivalent delay of the engine crankshaft from the moment at which is rotates past the said reference angular position, and the expiration of this delay time after the movement of the crankshaft past the reference angular position is then computed to determine the ignition timing. The control circuit according to the present invention is therefore free from deterioration with agee, capable of determining the correct ignition timing with very great accuracy, and capable of changing, as desired, the ignition timing characteristic by changing the programs.
Abstract translation: 提供了一种用于电气确定内燃机的点火正时的控制电路。 传统火花提前机构的最常见类型是其中构成凸轮和电接触组件的凸轮和接触点的相对位置根据发动机的转数和进气歧管的大小而变化的机构 真空分别由离心调速器和真空推进器检测，以在适合发动机工作状态的点火点产生点火信号。 然而，这种类型的火花提前机构的缺点在于，凸轮和接触点的磨损导致点火正时的改变，而且难以设计该机构以提供各种点火正时特性。 根据本发明，将发动机的曲轴的某个角度位置作为基准点，并且根据发动机的转数和歧管真空的变化预先对来自该参考位置的延迟角进行编程， 由此根据发动机的条件，从程序中读出对应的延迟角，然后将其从旋转经过所述参考角位置的时刻转换成发动机曲轴的等效延迟， 然后计算出曲轴运动超过参考角位置之后的延迟时间，以确定点火正时。 因此，根据本发明的控制电路不会因年龄而劣化，能够以非常高的精度确定正确的点火正时，并且能够根据需要通过改变程序来改变点火正时特性。
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