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1. 发明专利

JPH08312442A LOAD CURRENT MONITORING METHOD 失效
公开(公告)号：JPH08312442A
公开(公告)日：1996-11-26
申请号：JP11422095
申请日：1995-05-12
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ISHIKAWA HIDEAKI , FUJISAWA MASAAKI , SASAKI MASAHIRO
IPC分类号： F02D45/00
摘要： PURPOSE: To monitor plural currents by a single amplifier curcuit and a single A/D converter, by providing a means to monitor the current flowing to the load, to each driving circuit to control the plural loads individually, and inputting the voltages to the A/D converter after the currents are converted to voltages. CONSTITUTION: When four O2 heaters 24a to 24d as loads are provided to a system to control the driving circuit of an engine control device 21, the currents flowing to the loads are detected by resistance elements 22a to 22d, and converted to voltages. Then, signals converted to voltages are delivered in order, to an amplifier circuit 26 by a multiplxer 25, and after amplified there, they are digital converted by an A/D converter built in to a microcomputer 23, and the operating currents of the O2 heaters 24a to 24d are measured from the digital signals. In such a way, the currents flowing to plural loads respectively can be monitored by a single amplifier circuit and a single A/D converter, and a control device can be composed at a low cost.

2. 发明专利

JPH07119538A ENGINE CONTROL DEVICE 失效
公开(公告)号：JPH07119538A
公开(公告)日：1995-05-09
申请号：JP26455993
申请日：1993-10-22
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SASAKI MASAHIRO , SASAKI SHOJI , ISHIKAWA HIDEAKI
IPC分类号： F02D45/00
摘要： PURPOSE:To facilitate trouble shooting by connecting a memory rewriter, external equipment, to the communication circuit of a CPU, and rewriting the contents of a non-volatile memory with data erasable and writable in the CPU, by the memory rewriter. CONSTITUTION:In a control device 1, a detection signal from an operating state detecting sensor in an engine 2 is waveform-processed by an input processing circuit 4, the optimum operating state is computed by a CPU 3, and a computed control signal is outputted to the engine 2 by an output circuit 5. In the CPU 3, an MPU 7 is put in action according to the control program of an ROM 8, and the computed result is stored in an RAM 9. A memory rewriter 11, external equipment, is connected to the communication circuit 10 of the CPU 3. On the other hand, the action of the CPU 3 is monitored by a watch dog circuit 12, and in the case of abnormality being generated to the CPU 3, the CPU 3 is reset. The contents of the ROM 8 is thereby rewritten by the memory rewriter 11 so as to facilitate trouble shooting.

3. 发明专利

JPH08296484A ENGINE CONTROLLER 失效
公开(公告)号：JPH08296484A
公开(公告)日：1996-11-12
申请号：JP9922695
申请日：1995-04-25
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SASAKI MASAHIRO
IPC分类号： G01N27/409 , F02D41/06 , F02D41/14 , F02D41/22
摘要： PURPOSE: To improve starting ability at a low temperature by providing a means for detecting electric current passing through an oxygen heater which activates an oxygen sensor for fuel injection control when starting an engine at a low temperature even if a water temperature sensor is broken. CONSTITUTION: This engine controller inputs various sensor signals for computation, and controls actuators such as a fuel injection device and an ignition device so that an optimum driving condition may be obtained. The driving element 22 of an oxygen heater 24 in an oxygen sensor with a heater is controlled by the output signal of a microcomputer 23. At this time, the electric current passing through the oxygen heater 24 is detected by a current detection circuit 25 and is replaced with voltage to be inputted into the microcomputer 23. If a water temperature sensor breakage detection condition is detected, the current of the oxygen heater is detected while the oxygen heater is being energized to compute water temperature T from the maximum current. When the initial value of the water temperature T is large, injection is controlled at the time of starting based on the water temperature T.

4. 发明专利

JPH08296506A ENGINE CONTROLLER 失效
公开(公告)号：JPH08296506A
公开(公告)日：1996-11-12
申请号：JP10188795
申请日：1995-04-26
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： TAKAHASHI HIROMI , SASAKI MASAHIRO , SATO MASAHIRO , ISHIKAWA HIDEAKI
IPC分类号： F02M25/07 , F02D43/00
摘要： PURPOSE: To avoid malfunction in the operation of an engine at the time of CPU back-up by constituting in such a manner that a step motor can be driven even after a failure of CPU is detected when a degree of opening of an exhaust gas reflux valve is controlled by changing a lift of a valve body by driving the step motor in accordance with operation condition. CONSTITUTION: Air-fuel mixture enters a cylinder from a suction pipe for combustion, and a part of exhaust gas exhausted from an exhaust pipe passes an EGR valve of step motor type and is refluxed into the suction pipe so as to reduce the amount of NOx contained in the exhaust gas and improve a fuel consumption rate. At this time, if a CPU monitoring circuit 3 detects abnormality of a CPU 2, it is changed over to a gate alley 5 for back-up which can control the ignition time required for the operation of an engine and fuel injection amount. An EGR valve signal output circuit 8 of step motor type which can output energized pattern for valve close operation is built in the gate alley 5, and the EGR valve is fully closed through an output circuit 11 in accordance with its output.

5. 发明专利

JPH04347351A ENGINE CONTROLLER 失效
公开(公告)号：JPH04347351A
公开(公告)日：1992-12-02
申请号：JP12088691
申请日：1991-05-27
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SASAKI MASAHIRO , TABUCHI KENJI , ISHIKAWA HIDEAKI , NAKAZURU KUNIHITO
IPC分类号： F02D45/00
摘要： PURPOSE:To extract an initial failure and prevent any defective at the market by making the write voltage of a memory alterable at the time of program changing, in an engine controller with a program changing means in the memory at the onboard. CONSTITUTION:An engine controller 1 converts an input signal for performing engine control into a requisite form by means of an input processing circuit 10, transmitting it to an operational part 3, and here required data are taken out of a memory part 4 together with input information, transmitting it to an output circuit 5 as well. A stabilized power circuit 2, using a battery 9 as a power source, feeds every part with an optimal constant voltage at all times through a power line 6, while the memory part 4 can be electrically subjected to a batch deletion, or made reprogramable. In this case, at the time of program changing, stabilized supply voltage is selected to a higher voltage than the usual one, and in this state, the program is transferred, and after this transfer is over, it is put back to a current-energizing voltage, performing a system motion check.

6. 发明专利

JPH01232136A ENGINE CONTROL DEVICE 失效
公开(公告)号：JPH01232136A
公开(公告)日：1989-09-18
申请号：JP5735588
申请日：1988-03-12
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SASAKI MASAHIRO , ABE OSAMU , ISHIKAWA HIDEAKI
IPC分类号： F02B1/04 , F02D41/00 , F02D41/10 , F02D41/14
摘要： PURPOSE:To maintain excellent performance of acceleration by constituting a device deciding an acceleration correction for whether it is proper or not and correcting the acceleration correction in accordance with the decision by the time from the point of time controlling an engine to be accelerated till a detecting result of air-fuel ratio by an O2 sensor changes from the lean to the rich. CONSTITUTION:When an engine 1 is controlled to be accelerated, a detecting signal by an O2 sensor 5 changes once to the lean thereafter to the rich by a response delay or the like in a fuel supply system for the response in an intake air system. Now when assumed T in this time for time after the engine is controlled to be accelerated till it changes into the rich, this time T shows a sufficient correlation for an acceleration response. Then detecting this time T, thus correcting an acceleration correction, an optimum correction condition can be always maintained.

7. 发明专利

JPH07287603A ENGINE CONTROLLER 失效
公开(公告)号：JPH07287603A
公开(公告)日：1995-10-31
申请号：JP8013394
申请日：1994-04-19
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SASAKI MASAHIRO , ISHIKAWA HIDEAKI
IPC分类号： F02D45/00 , G05B9/02 , G05B15/02 , G05B23/02 , G06F15/78 , G11C7/00
摘要： PURPOSE:To execute a screening by impressing the power source voltage of a ROM on a board by making the voltage higher than normal voltage to operate the controller by making an ambient temperature a high temperature. CONSTITUTION:An engine controller 1 where programs or data are written in a ROM 8 is made a normal power source voltage state, whether the controller normally operates or not is decided, and when the controller performs a malfunction, the controller is defined as a rejected product. When the controller normally operates, the voltage of a stabilized power source circuit 12 is switched to the voltage which is higher than normal voltage and a CPU 3 is energized in a state that an ambient temperature is made a high temperature for preliminarily prescribed time and a screening is performed. After the screening is terminated, the voltage of the stabilized power source circuit 12 is switched to normal voltage, whether the controller normally operates or not is decided. When the controller performs a malfunction, the controller is defined as the rejected product, and when the controller normally operates, it is defines as an acceptable product. Thus, the initial defect of the ROM 8 of the CPU 3 can be extracted on a board.

8. 发明专利

JPH02305367A ENGINE CONTROLLER 失效
公开(公告)号：JPH02305367A
公开(公告)日：1990-12-18
申请号：JP12434989
申请日：1989-05-19
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SASAKI MASAHIRO , ISHIKAWA HIDEAKI
IPC分类号： F02P5/152 , F02D45/00 , F02P5/15 , F02P5/153
摘要： PURPOSE:To improve detection accuracy for knocking when at least ignition timing of an engine is controlled based on a signal from a sensor by which driving state of the engine is detected, by changing a central frequency of B.P.F in a knocking detection circuit. CONSTITUTION:A detection signal of a knock sensor 10, after input to a knock signal detection circuit 11 including a B.P.F circuit 12, is input to an electronic controller 18 along with detection signals from a crank angle sensor 16 as well as an air flow sensor 17. After a predetermined operation is processed based on each input signal by the electronic controller 18, the operated control signal is output to an ignition coil 24 via an ignition timing controller 23, whereby an ignition plug 25 is lighted up. A central frequency of the B.P.F circuit 12 is changed to an optimum value according to the driving state of the engine by a variable B.P.F device 26. Detection accuracy for knocking is thus improved.

9. 发明专利

JPH07119528A ENGINE CONTROL DEVICE 失效
公开(公告)号：JPH07119528A
公开(公告)日：1995-05-09
申请号：JP26456393
申请日：1993-10-22
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： TAKAHASHI HIROMI , SASAKI MASAHIRO , ISHIKAWA HIDEAKI
IPC分类号： G01M15/04 , F02D41/20 , F02D41/22 , F02D45/00 , G01M15/00
摘要： PURPOSE:To make it possible to carry out self-diagnosis by one time monitoring by making self-diagnosis of an inductive load by the existence of a signal corresponding to the waveform of the counter-electric voltage detected when the inductive load is off in case of controlling inductive load of a solenoid or the like. CONSTITUTION:In the case of an engine control device 1, a control signal A is output from the I/O of a CPU 7 and controls on/off timing of a solenoid valve 2 as an inductive load through a solenoid valve drive circuit 3. At this time, the counter-electric voltage generated when the solenoid 2 is off is detected by a detection circuit 4. The detected counter-electric voltage is input into the I/O of the CPU 7 through a waveform processing circuit 5. Meanwhile, a specific pulse is generated by a pulse generating circuit 6 responsing to the timing when control signal A is off and input in the I/O of the CPU 7. In other words, a specific signal corresponding to the counter-electric voltage waveform of the inductive load 2 is formed and the inductive load 2 is self-diagnosed in accordance with the existence of the signal generation.

10. 发明专利

JPH02245476A DEVICE FOR CONTROLLING ENGINE IGNITION TIMING 失效
公开(公告)号：JPH02245476A
公开(公告)日：1990-10-01
申请号：JP6495789
申请日：1989-03-18
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SASAKI MASAHIRO
IPC分类号： F02P5/152 , F02D45/00 , F02P5/15 , F02P5/153
摘要： PURPOSE:To suppress knocking surely at any time when knocking is detected by delaying an ignition timing by a constant delay amount value followed by knocking control by the use of calculated delay angle. CONSTITUTION:During the operation of an engine, data L representing an engine load is calculated with a CPU in an electronic control device 18 from an engine rpm according to a crank angle sensor 16 and an intake flow rate according to an air flow sensor 17. A slice level corresponding to the data L is also calculated. A knocking level is detected from a knocking signal taken via a knocking signal detection circuit 11 from a knocking sensor 10 and compared with the slice level to determine the occurrence of knocking. When the judgment is affirmative, an ignition delay constant value set in a ROM 21 is set as an ignition delay amount to delay the ignition timing followed by delaying of the ignition timing by the use of calculated ignition timing delay value.

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