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1. 发明专利

JPH01273848A FUEL FEED QUANTITY CONTROLLER 失效
公开(公告)号：JPH01273848A
公开(公告)日：1989-11-01
申请号：JP10122888
申请日：1988-04-26
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KAMEDA KAZUNOBU , MORITA KIYOMI , KIKUCHI TAKASHI , TANABE YOSHIYUKI
IPC分类号： F02D41/00 , F02D41/14 , F02D41/34 , F02D45/00
摘要： PURPOSE:To permit the air-fuel ratio control with high precision by memorizing a correction value in the result of learning from the difference between an actual air-fuel ratio and aimed air-fuel ratio and successively integration-calculating a part of the correction value at each time when the correction value is memorized into a memory map and correcting the correction coefficient searched from the memory, by the integration-calculation value. CONSTITUTION:In a calculation part C, the fundamental supplied fuel quantity is calculated by adding the correction according to the cooling water temperature detected by a cooling water temperature sensor 8, onto the engine load calculated in a calculation part A and the engine revolution speed measured by a measurement part B. Further, in an air-fuel ratio feedback control part D, the air-fuel ratio feedback coefficient is obtained according to the actual air-fuel ratio detected by an air-fuel ratio sensor 2, and in a learning part E, said coefficient is memorized in division in the pertinent region of an air-fuel ratio correction coefficient map 1306 divided by the engine revolution speed and the load and an air-fuel ratio deviation coefficient 1307 which is common in all the regions. Then, in a calculation part F, the learning correction value is obtained from the value of the map 1306 and the air-fuel ratio deviation coefficient 1307, and in a correction part G, the fundamental supplied fuel quantity is corrected from the learning correction value and the air-fuel ratio feedback coefficient.

2. 发明专利

JPH0223242A FUEL CONTROL DEVICE 失效
公开(公告)号：JPH0223242A
公开(公告)日：1990-01-25
申请号：JP17093188
申请日：1988-07-11
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KIKUCHI TAKASHI , MORITA KIYOMI , TANABE YOSHIYUKI , KAMEDA KAZUNOBU
IPC分类号： F02D41/14
摘要： PURPOSE:To take a feedback constant as an air density correction value and to make favorable air-fuel ratio control by continuing air-fuel ratio feedback control when an engine is in the idling state and a vehicle is running. CONSTITUTION:The respective detections signals from a throttle sensor 16 for detecting the opening of a throttle valve 14 disposed in an intake passage 12, an oxygen concentration sensor 22 disposed in an exhaust manifold 20, a top dead center sensor 26 disposed in a distributor 24, a crank angle sensor 28, a car velocity sensor 32 disposed in a transmission 80 and a neutral sensor 34 are input to a digital control circuit 40. On the other hand, a designated control signal is output to an injector 18 from a digital control circuit 40 to control the fuel injection quantity. In this case, when an engine is in the idling state and a vehicle is running, the air-fuel ratio feedback control is continued.

3. 发明专利

JPH01177430A FUEL CONTROL DEVICE 失效
公开(公告)号：JPH01177430A
公开(公告)日：1989-07-13
申请号：JP33024187
申请日：1987-12-28
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KAMEDA KAZUNOBU , MORITA KIYOMI , KIKUCHI TAKASHI , TANABE YOSHIYUKI
IPC分类号： F02D41/04 , F02D41/00 , F02D45/00
摘要： PURPOSE:To enable simple and proper height correction for fuel control by obtaining the inclination of a running road on the basis of a driving force given from an engine to a vehicle, and a climbing-up and down height difference on the basis of the aforesaid inclination and a travel distance. CONSTITUTION:The control unit 8 of a fuel control device computes a basic fuel supply quantity on the basis of an engine speed 13 and an engine load 16. In this case, an actual driving force map 10 is retrieved on the basis of the engine speed 13, a gear position 15 and the engine load 16, thereby obtaining an actual driving force 20. Also, a road grade 21 is obtained on the basis of the actual driving force 20 and acceleration 17. Furthermore, a height difference 22 is obtained on the basis of the road grade 21 and a travel distance 18. And a height correction value 23 is retrieved from a height difference correction value table 11 on the basis of the height difference 22, and feed fuel correction value 24 is obtained on the basis of the aforesaid height correction value 23 and a basic air-fuel ratio correction value 19 obtainable from an O2 sensor 6.

4. 发明专利

JPH02153261A INTERNAL COMBUSTION ENGINE CONTROL PART 失效
公开(公告)号：JPH02153261A
公开(公告)日：1990-06-12
申请号：JP30401488
申请日：1988-12-02
申请人： HITACHI LTD
发明人： MORITA KIYOMI , KAMEDA KAZUNOBU
IPC分类号： F02P5/15
摘要： PURPOSE:To enable suppression of a fluctuation in torque produced during feedback control of an air-fuel ratio by providing a control means which retards an ignition timing when a mixture ratio brings fuel into a rich state and advances the ignition timing when fuel is brought into a lean state. CONSTITUTION:A control unit 7 to which output signals from a crank angle sensor 1, an oxygen sensor 2, a water temperature sensor 3, a throttle valve opening sensor 4, and an intake air amount sensor 8 are inputted computes the pulse width of a fuel injection drive pulse and an ignition timing according to the input signals. Namely, regarding an ignition timing, an ignition fundamental advance angle value determined according to the number of revolutions of an engine and an intake air amount is corrected by means of a correction value responding to a cooling water temperature to decide an ignition position. In this case, the control unit 7 retards an ignition timing by a given amount when an air-fuel ratio brings air into further rich state than a theoretical air-fuel ratio, and advances an ignition timing by a given amount when it brings fuel into a lean state.

5. 发明专利

JPS63111248A FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPS63111248A
公开(公告)日：1988-05-16
申请号：JP25569886
申请日：1986-10-29
申请人： HITACHI LTD
发明人： MANAKA TOSHIO , ATAGO TAKESHI , SAKAMOTO MASAHIDE , KAMEDA KAZUNOBU
IPC分类号： F02D41/04 , F02D41/00
摘要： PURPOSE:To always obtain the optimum air-fuel ratio and to improve operability by controlling the intake air quantity during load operation according to a parameter showing engine load, and giving a limit to decreasing speed in the direction of decreasing the intake air quantity. CONSTITUTION:During operation of an engine, a target idle rotational frequency, basic ON duty applied to ISC valve 3 disposed parallel to an air intake throttle valve 1 and a duty correction value of basic injection quantity are retrieved in a control unit 7. Subsequently the decrease of the above duty correction value is selected according to an idle switch signal and a neutral switch signal. The decrease is selected in such a manner as to be the maximum value in the no-load state where a neutral switch is ON. After that, the present duty correction retrieved value and the actual correction value are compared, and if the former is larger than the latter, it is subtracted by a selected value. If the former is smaller than the latter, a retrieved value is set at a duty correction value to control ISC valve 3.

6. 发明专利

JPH0211734B2 失效
公开(公告)号：JPH0211734B2
公开(公告)日：1990-03-15
申请号：JP18704383
申请日：1983-10-07
申请人： HITACHI LTD
发明人： TANABE YOSHUKI , KASHIWATANI MINEO , MORITA KYOMI , KAMEDA KAZUNOBU
IPC分类号： F02M69/00 , F02M69/32

7. 发明专利

JPS6079162A FUEL INJECTOR 失效
公开(公告)号：JPS6079162A
公开(公告)日：1985-05-04
申请号：JP18704383
申请日：1983-10-07
申请人： HITACHI LTD
发明人： TANABE YOSHIYUKI , KASHIWATANI MINEO , MORITA KIYOMI , KAMEDA KAZUNOBU
IPC分类号： F02M69/00 , F02M69/32
摘要： PURPOSE:To prevent fuel from being formed into droplets during idling and improve engine stability during idling by providing an air passage bypassing a throttle valve and introducing the air for destroying eddy currents into the intake passage downstream the throttle valve. CONSTITUTION:A throttle valve 3 is provided on an air passage 2, and a fuel injection valve 4 is provided upstream it. A hot wire sensor 5 is provided on a bypass air passage 7 between an intake passage 8 and a Venturi section 9, and the fuel injection valve 4 is controlled by a computer based on its air flow signal. In this case, a bypass air passage 12 having an inlet 13 downstream the outlet 14 of the bypass 7 outside the fuel cone upstream a throttle valve 3 and having an outlet 15 on the wall surface of a main body 1 downstream the throttle valve 3 is provided. The air passing the bypass air passage 12 is injected downstream the throttle valve 3 toward the center of the air passage 2 to prevent the wrap up of the air-fuel mixture. Accordingly, fuel is prevented from being formed into droplets during idling.

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