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公开(公告)号：JPH02286849A
公开(公告)日：1990-11-27
申请号：JP10852789
申请日：1989-04-27
Applicant: TOYOTA MOTOR CORP
Inventor： ITOU TOKIJI , SHIBATA NORIO
IPC: F02D41/16
Abstract: PURPOSE:To enhance the convergence characteristic to the target number of revolutions by performing control of the number of idling revolutions through calculation of the anticipative value of actual number of revolutions, that should be followed by calculation of the feedback correction amount according to the deviation of this antici pative value from the target number of idling revolutions. CONSTITUTION:A number-of-revolutions sensing means 21 senses the number of revolutions of an internal combustion engine 20 is sensed at certain intervals, and a number-of-revolutions anticipating means 22 calculates the anticipative value of the number of revolutions a certain time later, and the result therefrom is fed to a feedback correction amount calculating means 23. This calculates the feedback correction amount D according to the deviation of this anticipative value from the target number of idling revolutions NT. This correction amount D is fed back to the internal combustion engine 20 to control the air amount flowing in a bypass which circulates through the upstream and downstream of a throttle valve. Thereby, the air amount is put under control on the basis of the anticipative value in which under shoot and overshoot are grapsed precisely in advance. Thus, undershoot and overshoot are suppressed, and the actual number of revolutions can be converged to the target number of idling revolutions quickly.
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公开(公告)号：JPS63131855A
公开(公告)日：1988-06-03
申请号：JP27781386
申请日：1986-11-22
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA NORIO
IPC: F02M3/045
Abstract: PURPOSE:To suppress exhaust of uncombusted gas and prevent catalyzer from overheating by shutting a fuel cut valve, which is shut under deceleration, only when an oxygen concentration sensor is emitting a lean signal during deceleration. CONSTITUTION:A carburettor 3 is equipped with a fuel cut valve 23, which controls opening/closing of a slow fuel port 8 and an idle port 9. Signals from a throttle opening sensor 24, an oxygen concentration sensor 25, etc., are entered in a control circuit 30, and the fuel cut valve 23 is shut, when the engine is under decelerative operation and said oxygen concentration sensor 25 is emitting a lean signal, to stop fuel supply from a slow fuel passage 13. This prevents exhaust of a great quantity of uncombusted HC, CO due to misfire caused by supply of a lean mixture gas to lead to prevention of the catalyzer from overheating.
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公开(公告)号：JPS6390653A
公开(公告)日：1988-04-21
申请号：JP23526386
申请日：1986-10-02
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA NORIO
IPC: F02M25/07
Abstract: PURPOSE:To make an accurate diagnosis of the unit stated in the title by judging that the unit is defective when the counted value of a counter counted in response to a driving range is above the fixed value and the exhaust gas temperature is below the fixed value. CONSTITUTION:A microcomputer 50 detects whether or not it is within a driving range to perform the exhaust gas recirculation in response to the engine speed of an internal combustion engine 1, the temperature of the cooling water and the negative pressure in an intake pipe detected by an engine speed sensor 56, a water temperature sensor 57 and a negative pressure switch 58. A counter equipped with a CPU 51 counts up when it is detected that it is within the driving range to perform the exhaust gas recirculation and counts down when it is detected that it is not within the driving range to perform the exhaust gas recirculation. Next, when the counted value of the counter is above the fixed value and the temperature of an exhaust gas recirculation conduit 10 detected by a temperature sensing switch 59 is below the fixed value, an indicator lamp 60 lights while judging that the exhaust gas recirculating device is defective.
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公开(公告)号：JPS631753A
公开(公告)日：1988-01-06
申请号：JP14478286
申请日：1986-06-23
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA NORIO
Abstract: PURPOSE:To make it possible to early check the failure by judging an air-fuel control system as the failure if the feedback quantity exceeds the predetermined limit over the predetermined time while excluding the effect of evaporative fuel purge. CONSTITUTION:In an evaporative fuel absorbing device 9, one end thereof is connected to a fuel tank 8 through a conduit 14 and the other thereof is connected to an intake manifold 2 through a conduit 15. When a purge control solenoid valve 16 interposed in the conduit 15 is opened, a fuel steam absorbed in activated carbon 17 is released and supplied into the intake manifold 4 together with air. When an air-fuel ratio is feedback-controlled based on the output of an exhaust gas sensor 7, if the air-fuel feedback quantity exceeds the predetermined limit over the predetermined time, the solenoid valve 16 is temporarily closed. Then, if the feedback quantity exceeds the predetermined limit over the predetermined time after the closing of the solenoid valve 16, it judges the air-fuel ratio control system as the failure.
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公开(公告)号：JPH10288073A
公开(公告)日：1998-10-27
申请号：JP9874997
申请日：1997-04-16
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA NORIO
Abstract: PROBLEM TO BE SOLVED: To provide an idle CO concentration adjusting device of an internal combustion engine capable of adjusting and holding the CO concentration of the exhaust gas from the engine in the idle time, without using a CO densitometer, at those values within a proper range even if an internal combustion engine performing idle speed control. SOLUTION: At the adjustment of idle CO concentration, first the air fuel ratio of fuel mixture sucked into a combustion chamber 16 is adjusted so that the idle speed reaches the maximum value. When the idle speed reaches the maximum value, the idle CO concentration is larger slightly than a value within a proper range. Under this condition, when the opening of an idle speed control valve 49a is fixed and the fuel injection amount is reduced by a specified volume, the idle CO concentration becomes a value within a proper range. Through such a procedure, even in an engine 11 performing idle engine control, the idle CO concentration can be adjusted and held with a proper range without using a CO densitometer.
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Patent Agency Ranking
公开(公告)号：JPH0367063A
公开(公告)日：1991-03-22
申请号：JP20252589
申请日：1989-08-04
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA NORIO
Abstract: PURPOSE:To avoid increase in the capacity of a memory by performing the ignition timing control in the event of failure in a knock sensor system at the base ignition timing according to a two-dimensional map set at a knock avoid point while in the knock range. CONSTITUTION:A control means 16 prohibits knock control when No. 1 judging means 13 judges that the signaling line of a knock sensor 12 is troubled, and an ignition means 17 is driven at the ignition timing according to a two-dimen sional map read out of a memory 15. If judgement made by No.2 judging means 14 is such that the operating condition of an engine 11 lies in the off-knocking range, the ignition means 17 is driven at the ignition timing which gives max. torque. In the knocking range, on the other hand, the ignition means 17 is driven at the base ignition timing according to the two-dimensional map, at which the ignition timing is set at the knock avoid point. This requires use of only one two-dimensional map, and proper ignition timing can be obtained even in the event of failure in the knock sensor signaling line without increasing the memory capacity.
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公开(公告)号：JPH0255849A
公开(公告)日：1990-02-26
申请号：JP20645888
申请日：1988-08-22
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA NORIO
IPC: F02D41/14
Abstract: PURPOSE:To make an air-fuel ratio controllable to a theoretical air-fuel ratio in a highly accurate manner by changing an air-fuel ratio feedback factor to a different value at the time of exhaust control stoppage when exhaust reflux takes place or when an amount of the exhaust is larger than the specified value. CONSTITUTION:An air-fuel ratio correction factor is calculated on the basis of a signal of an oxygen sensor 43 at a control circuit 51 when an engine driving state is in a feedback area. Here, an integration constant in this air-fuel ratio correction factor or a skip quantity takes a different value according to an exhaust gas recirculation(EGR) area and such other than this EGR area. With this constitution, the air-fuel ratio correction factor at this EGR area is made larger or smaller than the case other than the EGR area. Consequently, even if distribution of exhaust reflex to each cylinder at the EGR area is ununiformity, and that the oxygen sensor 43 is liable to be subject to the influence of a specified cylinder, an air-fuel ratio is controllable to a theoretical air-fuel ratio in a highly accurate manner, whereby exhaust gas can be cleaned up thoroughly.
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公开(公告)号：JPS6390654A
公开(公告)日：1988-04-21
申请号：JP23526486
申请日：1986-10-02
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA NORIO
Abstract: PURPOSE:To make an accurate diagnosis of the unit stated in the title by judging that the unit is defective when the exhaust gas temperature is below the fixed value under the condition of being detected that it is in the driving range to perform the exhaust gas recirculation. CONSTITUTION:A microcomputer 50 detects whether or not it is within a driving range to perform the exhaust gas recirculation in response to the engine speed of an internal combustion engine, the temperature of the cooling water and the negative pressure in an intake pipe detected by an engine speed sensor 54, a water temperature sensor 55 and a negative pressure switch 56. When it is detected that it is in the driving range to perform the exhaust gas recirculation, the exhaust gas recirculating device is judged to be defective and an indicator lamp 62 lights when the temperature of the exhaust gas recirculating pipe detected by a temperature sensor 59 has has not exceeded the second fixed value after elapse of a certain fixed time from the time the temperature of the exhaust gas recirculating pipe had reached the first fixed value.
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公开(公告)号：JPS62153552A
公开(公告)日：1987-07-08
申请号：JP29519685
申请日：1985-12-27
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA NORIO
Abstract: PURPOSE:To stabilize control by detecting the relaying region between the primary system and the secondary system and compulsorily generating the rich state and then returning to the feedback control when the rich signal is obtained in an O2 sensor, in an O2 feedback controller for 2-barrel type carburetor. CONSTITUTION:A carburetor 12 equipped with the primary side and the secondary side is feedback-controlled on the basis of the output mainly of an O2 sensor 22 in an exhaust system 24 by controlling an air fuel ratio controller 44 having a solenoid valve in an air bleed by a controller 42. The opening degree of a throttle valve 14, negative pressure 19, etc. are input into the controller 42, and the region in which also the secondary side is operated is detected, and in the relay region, feedback control is suspended, and a prescribed rich state is generated, and then, the feedback control is carried out when the rich signal is outputted from the O2 sensor, and the engine trouble due to the formation of lean state in relaying is prevented.
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公开(公告)号：JPS6119962A
公开(公告)日：1986-01-28
申请号：JP14110484
申请日：1984-07-06
Applicant: Toyota Motor Corp
Inventor： SHIBATA NORIO
Abstract: PURPOSE: To secure a purge flow rate to the maximum and keep the suction capacity of a suction device in a sufficiently higher state as well as to check variations in an air-fuel ratio due to purging to the minimum, by setting the purge flow rate to be smaller when a suction air quantity is little but larger when it is abundant, respectively.
CONSTITUTION: A physical value representing a suction air quantity of an engine is detected by a suction air quantity detecting device, and at a duty controlling device, opening or closing of an on-off valve is controlled for its duty ratio. And, the duty ratio is altered according to the suction air quantity to be detected by the suction air quantity detecting device, and when the suction air quantity comes much, opening time of the on-off valve is made longer while shorter in the closing time, respectively. As a result, when the suction air quantity is little, a purge flow rate is made smaller but when it is much enough, the purge flow rate is made much too, so that the purge flow rate is secured to the maximum as avoiding exerting an adverse effect on engine drivability and exhaust emission control performance by means of purging of the suction device, thus the suction capacity of the suction device is maintainable in a higher state.
COPYRIGHT: (C)1986,JPO&JapioAbstract translation: 目的：为了确保最大的清洗流量，并将吸入装置的吸入能力保持在足够高的状态，并且通过将吹扫流量设定为最小来检查空气 - 燃料比的变化， 当吸入空气量分别较大时较小，分别较小。 构成：通过吸入空气量检测装置检测表示发动机的吸入空气量的物理值，在占空比控制装置中，对占空比进行控制，对开闭阀进行打开或关闭。 并且，占空比根据吸气量检测装置检测的吸入空气量而改变，当吸入空气量多时，开闭阀的打开时间变长，关闭时间缩短 ， 分别。 结果，当吸入空气量很少时，清洗流量变小，但是当足够大时，清洗流量也很大，因此清洗流量被确保为最大，因为避免施加 通过抽吸装置的吹扫对发动机驱动能力和废气排放控制性能产生不利影响，因此吸入装置的吸入能力可维持在较高的状态。
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