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公开(公告)号：JPH05296035A
公开(公告)日：1993-11-09
申请号：JP17975991
申请日：1991-07-19
Applicant: TOYOTA MOTOR CORP , TOYOTA CENTRAL RES & DEV
Inventor： ARAGA TOSHIMI , SUDO EIICHI , OSHIMA YUJIRO , MATSUSHITA SOICHI
Abstract: PURPOSE:To enhance exhaust gas purifying performance with respect to the exhaust gas purifying device for an internal combustion engine provided with an afterburner in its exhaust system. CONSTITUTION:A bubbling chamber (hereinafter referred to as a chamber) 33 that extracts a low boiling point constituent whose ignitability and combustibility are good out of fuel (gasoline) is provided, and a fuel supply system 31 and an air supply system 32 that are forked from the fuel supply system 2 and the air intake system 3 of an internal combustion engine 1 are respectively connected to the chamber. The air supply system 32 is further forked on the way and a secondary air line 42 provided with a temperature-sensitive regulating valve 40 is connected to an afterburner 18. And a fuel-air mixture supply line 34 that conveys the low boiling point constituent of the fuel produced inside the chamber 33 is provided. In the afterburner 18, hydrocarbon in exhaust gas is certainly burnt and oxidized by the positive burning of the low boiling point constituent diluted to a nearly theoretical air-fuel ratio by secondary air from the secondary air line 42, and exhaust gas purifying performance is enhanced.
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公开(公告)号：JPH05118245A
公开(公告)日：1993-05-14
申请号：JP28152791
申请日：1991-10-28
Applicant: TOYOTA MOTOR CORP
Inventor： MATSUSHITA SOICHI
IPC: F02B17/00 , F02B23/10 , F02B75/12 , F02D33/00 , F02D35/02 , F02D41/30 , F02D41/34 , F02D41/38 , F02D41/40 , F02D45/00
Abstract: PURPOSE:To constantly provide a good burning when fuel is injected in the inlet stroke and in the compression stroke. CONSTITUTION:In an internal combustion engine where a required fuel injection quantity Q is injected dividedly in the inlet stroke and in the compression stroke, the fuel injection quantity QS in the inlet stroke is determined by multiplying the Q by a division factor QR, and the fuel injection quantity Q in the compression stroke is determined by subtracting the QS from the Q. The QR is found from a map maded on the basis of the Q, and corrected by a correction value KQR. The burning state is judged based on the pressure in the cylinder. When an initial misfire is produced in the judged burning state, and it is a rich misfire, the KQR is increased, and when it is a lean misfire, the KQR is reduced. On the other hand, when no misfire is produced, and the flame propagation is judged defective, the KQR is increased.
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公开(公告)号：JPH04224251A
公开(公告)日：1992-08-13
申请号：JP40609190
申请日：1990-12-25
Applicant: TOYOTA MOTOR CORP
Inventor： HIYOUDOU YOSHIHIKO , MATSUSHITA SOICHI
Abstract: PURPOSE:To find out certainly the correction value of a fuel injection amount at the time of acceleration, and make an output torque accord with a target torque so as to control certainly an air fuel ratio to be a target air fuel ratio by not impressing the ratio of the output torque to the target torque on the correction value of the fuel injection amount at the time of acceleration during a prescribed period after starting acceleration. CONSTITUTION:An initial attenuation coefficient is renewed by an attenuation coefficient renewal means M5 on the basis of the ratio of an output torque to a target torque at the time of initial acceleration, and an initial correction value reduced by the initial attenuation coefficient is calculated by an initial correction value calculating means M6. It is regulated by a regulation means M7, that the ratio of the output torque to the target torque is not impressed on the initial attenuation corfficient daring a prescribed period after starting acceleration. A last attenuation coefficient is reneared by a last attenuation coefficient renewal means M8, on the basis of the ratio of an output torque to a target torque at the time of last acceleration, and the last correction value reduced by the last attenuation coefficient is calculated by a last correction value calculating means M9. A basic fuel injection amount calculated by a basic fuel injection amount calculating means M4 according to the initial correction value and the last correction value, is increased to be corrected by a fuel injection amount correcting means M10 at the time of acceleration.
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104.发明专利
公开(公告)号：JPH04136456A
公开(公告)日：1992-05-11
申请号：JP25714490
申请日：1990-09-28
Applicant: TOYOTA MOTOR CORP
Inventor： HIYOUDOU YOSHIHIKO , MATSUSHITA SOICHI
Abstract: PURPOSE:To correctly estimate the temperature of a sensor by judging two different operation conditions where the engine water temperature and the pressure sensor element temperature nearly accord and grasping the relation between the water temperature and the internal resistance from the water temperature and the temperature of the sensor which are measured under each operation condition. CONSTITUTION:During the engine operation, the first and second operation state judging means A and B judge two different operation states where the cooling water temperature and the element temperature of a combustion pressure sensor nearly accord. An internal resistance value detecting means C detects the internal resistance value of the sensor in the first and second operation states, and a cooling water temperature detecting means D detects the cooling water temperature in each operation state. An element temperature estimation means F estimates the element temperature by utilizing the detected internal resistance value under arbitrary operation condition on the basis of the memory data of a memory means E which memorizes the data as the foundation of the rectilinear relation between the internal resistance and element temperature from the internal resistance value of the sensor and the cooling water temperature value in the first and the second operation states.
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公开(公告)号：JPH03217640A
公开(公告)日：1991-09-25
申请号：JP1247690
申请日：1990-01-24
Applicant: TOYOTA MOTOR CORP
Inventor： KATO KENJI , MATSUSHITA SOICHI , INOUE TOKUTA
Abstract: PURPOSE:To improve NOx purifying rate by changing fuel injecting timing so as to increase HC amount which flows into a lean NOx catalyzer while it is being judged that the HC amount is not sufficient for purifying NOx. CONSTITUTION:An electronic control device 36 reads output VHC from an HC sensor 8 installed in an exhaust system and at the upstream of a lean NOx catalyser 2. It judges whether VHC of present HC amount in the exhaust is sufficient for V0 of required HC amount of NOx for purifying NOx in the lean NOx catalyser 2 or not. When the HC amount is judged insufficient, BIT of the best fuel injecting start timing is delayed. Since injecting time is unchanged, a part of injected fuel does not enter the inside of a cylinder at its injection cycle, but enters the inside of the cylinder at the next injection cycle along a port wall in the form of liquid, which makes complete combustion difficult to increase HC amount in the exhaust. It is thus possible to increase HC amount only for a changing time of NOx purifying rate in the lean NOx catalyser 2.
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Patent Agency Ranking
公开(公告)号：JPH02188649A
公开(公告)日：1990-07-24
申请号：JP588289
申请日：1989-01-17
Applicant: TOYOTA MOTOR CORP
Inventor： KOTANI TAKESHI , HYODO YOSHIHIKO , TAKIMOTO TOSHIYUKI , MATSUSHITA SOICHI
Abstract: PURPOSE:To improve the accuracy in operation control by obtaining the ratio of the required time in an explosion stroke in each cylinder at the time both fuel supply and fuel cut-off to the mean value of these required times regarding the entire cylinder, respectively, and detecting the output fluctuation in each cylinder from the difference among these ratios. CONSTITUTION:An engine speed range judging means A, which detects in what speed range the present engine revolution is, and a fuel supply discriminating means B, which discriminates whether fuel supply is carried out or not for each speed range, are prepared. The time required for the explosion stroke of each cylinder at the tie of fuel supply is obtained by a first, ratio-computer- means C for each engine speed. In addition, the ratio of the said required time in each cylinder to the mean value of these required times regarding the entire cylinders is computed. The similar ratio at the time of fuel cut-off is computed by means of a second ratio-computing-means D, for each engine speed range. Then, the output fluctuation in each cylinder is computed by means of an output fluctuation computing means E for each engine speed range, corresponding the difference in the above-mentioned ratios at the time of both fuel supply and fuel cut-off.
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公开(公告)号：JPH02176138A
公开(公告)日：1990-07-09
申请号：JP22049588
申请日：1988-09-05
Applicant: TOYOTA MOTOR CORP
Inventor： MATSUSHITA SOICHI , KOTANI TAKESHI , TAKIMOTO TOSHIYUKI
Abstract: PURPOSE:To stabilize an air-fuel ratio after warming up run by updating, by a learning means, a learning value per temperature region, which is provided in every temperature region of an engine, so that a torque fluctuating rate becomes a prescribed value, and adjusting the air-fuel ratio in response to the above learning value per temperature region by an air-fuel ratio adjusting means, when an engine is in the state of warming up run. CONSTITUTION:The torque fluctuating rate of an engine is calculated by a torque fluctuating rate calculating means, and it is discriminated by a warming up condition discriminating means whether the engine is in a warming up condition or not. As a result, a learning value Wi per temperature region, which is provided in every temperature region of the engine, is updated by a learning means so that the torque fluctuating rate becomes a prescribed value. Further, when the engine is in the warming up condition, an air-fuel ratio of the engine is adjusted by an air-fuel ratio adjusting means, in response to the learning value Wi per temperature region. Namely, during warming up, the learning value per temperature region is updated, therefore, since an air-fuel ratio lean limit control is operated in response to the temperature of the engine, the air-fuel ratio after warming up is stabilized without influencing a learning per load region after warming up, so that emission of HC, CO, NOx, fuel consumption and the like can be prevented from worsening.
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公开(公告)号：JPH0299743A
公开(公告)日：1990-04-11
申请号：JP25199288
申请日：1988-10-07
Applicant: TOYOTA MOTOR CORP
Inventor： KOTANI TAKESHI , TAKIMOTO TOSHIYUKI , MATSUSHITA SOICHI
IPC: F02D45/00
Abstract: PURPOSE:To lighten the load of a CPU by selecting an angle interrupting A/D conversion means which A/D-converts the output signals of a sensor group according to the output signal of a crank angle sensor and a time interrupting A/D conversion means which A/D-converts the output signals of the sensor group by using the A/D converter at each prescribed time, according to the prescribed operation state of the engine. CONSTITUTION:In an internal combustion engine equipped with an A/D converter equipped with a multiplexor built-in which A/D-converts the output voltage of a sensor group for detecting the operation state of the internal combustion engine, an angle interruption A/D converting means A/D-converts the output signals of the sensor group according to the signal of a crank angle sensor by the A/D converter, and a timing interruption A/D converting means performs A/D-converts at each prescribed time. A selecting means selects the angle A/D- conversion means, if N1 =N2, the time interrupting A/D conversion means is selected. Thus, the load of a CPU can be lightened.
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公开(公告)号：JPH0275743A
公开(公告)日：1990-03-15
申请号：JP22638288
申请日：1988-09-12
Applicant: TOYOTA MOTOR CORP
Inventor： TAKIMOTO TOSHIYUKI , KOTANI TAKESHI , MATSUSHITA SOICHI
Abstract: PURPOSE:To improve stability and responsiveness of an internal combustion engine by controlling a control factor of the engine according to an average of a torque change rate and a maximum value of torque change rate on which a large rate of torque decrease is influenced. CONSTITUTION:During operation of an internal combustion engine, a torque TRQ of the engine is detected by a torque detecting means A. A torque change rate DELTATRQ per a cycle is computed from the detected torque TRQ by an every cycle torque change rate computing means B. By an average torque change rate computing means C, average or annealed value in a specified period, for instance, ten cycles of the torque change rate DELTATRQ is computed as a first value DELTATRQ 10, while by a torque change rate maximum value computing means D, a maximum value DELTATRQM within a specified period, for instance, ten cycles, is computed as a second value. Control factor of the engine is adjusted according to the first and second values DELTATRQ 10, DELTATRQM by an adjusting means E.
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公开(公告)号：JPH0230955A
公开(公告)日：1990-02-01
申请号：JP30680688
申请日：1988-12-06
Applicant: TOYOTA MOTOR CORP
Inventor： KOTANI TAKESHI , TAKIMOTO TOSHIYUKI , HIYOUDOU YOSHIHIKO , MATSUSHITA SOICHI
Abstract: PURPOSE:To improve the operation control precision of an engine by calculating the ratios between the required time of the explosion stroke for individual cylinders and the average value of this required time for all cylinders at the time of the fuel feed and at the time of the fuel cutoff and detecting output fluctuations of individual cylinders in response to the difference of the ratios. CONSTITUTION:A fuel feed judging means A judging whether fuel is fed to an internal combustion engine or not is provided, when the fuel feed is judged, the required time of the explosion stroke for each cylinder is determined and the ratio between the required time for each cylinder and the average value of this required time for all cylinders is calculated by the first ratio calculating means B. On the other hand, when the fuel cutoff is judged, the required time of the explosion stroke for each cylinder is determined and the ratio between the required time for each cylinder and the average value of this required time for all cylinders is calculated by the second ratio calculating means C. Output signals of the calculating means B and C are inputted to an output fluctuation detecting means D, output fluctuations of individual cylinders are detected in response to the difference of the ratios thus calculated.
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