Abstract: The present invention relates to an electric control fuel injection system for motorcycle, especially for middle and small volume motorcycle. The invention includes CMOS chips, sensors, etc. The different air/fuel ratio corresponding to operating conditions can be obtained with the help of programs and parameters stored in the system and instantaneous parameters measured by sensors. The simple structure, less pollution and economy system can accurately control air/fuel ratio and ignition advance angle.

Abstract: Controlling an internal combustion engine which has an additional component provided in its exhaust gas conduit including a turbine and turbo of a turbo charger, includes enriching a mixture at a high throughput, determining a main filling signal by a main filling signal sensor and a substitute filling signal by a substitute filling sensor, converting the substitute filling signal into a control signal for at least one value selected from the group consisting of an air supply, a fuel supply and an ignition time point, such that the substitute filling signal is greater than the main filling signal by at least one protective factor, and selecting the protective factor so that at high throughput a change of the mixture toward a fattening is performed.

Abstract: A power supply system for a control unit of an internal combustion engine is provided which is capable of holding an engine controllable state after starting of the engine until the engine is stopped. A relay with a self holding function is inserted in a power supply line exclusively used for supplying electric power from a battery to the internal combustion engine control unit and its related devices. A relay drive and hold circuit 11 receives a relay drive signal and a main switch signal, drives and holds the relay 8 into a power supplying state as long as at least one of the main switch and the relay drive signal from an arithmetic processing section is input to the relay drive and hold circuit.

Abstract: A control system for controlling the displacement of a variable displacement internal combustion engine including measuring a variable indicative of torque for the variable displacement internal combustion engine, generating a torque threshold that indicates a torque condition to vary the displacement of the variable displacement internal combustion engine, and characterizing driver behavior to determine the torque threshold.

Abstract: Escape running performance at the time of the occurrence of an abnormality in an electronic throttle control system is improved. At the time of the occurrence of a severe abnormality, an abnormality storage element is operated, and an electric supply load relay of a throttle valve driving motor is de-energized to return a throttle valve to the default, and further, an alarm display is actuated, and an upper limit engine rotational speed is suppressed by control of a fuel injection valve, and escape running is carried out. As a suppression rotational speed, a lower limit threshold at a stop, a rotational speed substantially in proportion to the output of an accelerator position sensor, a rotational speed substantially in inverse proportion to the output of a throttle position sensor, or a default threshold rotational speed is selected, and multiple escape running can be carried out.

Abstract: To check a three-way catalytic converter, a NOx sensor is used to determine the NOx concentration downstream of the catalytic converter that is to be diagnosed. On account of the close relationship between a NOx conversion and a HC conversion, the measured NOx concentration can be used to determine the HC conversion properties of the three-way catalytic converter.

Abstract: An abnormality detecting apparatus for an intake system of an internal combustion engine, which detects an abnormality of the intake system, is disclosed. The intake system has a throttle valve, a bypass passage bypassing the throttle valve, and an idling control valve for controlling the amount of air supplied through the bypass passage to the engine. A total intake air amount supplied to the engine is calculated. An amount of intake air supplied through the bypass passage is calculated based on a valve opening control quantity for the idling control valve. A parameter indicative of a leak air amount of the intake system is calculated according to the result of a comparison between the calculated total intake air amount and the amount of intake air supplied through the bypass passage.

Abstract: A method and an arrangement mutually monitor control units. The control units are built up of three program levels. A first level is for executing the control apparatus functions and a second level is provided for monitoring the control apparatus functions and a third level is for monitoring the programs of the second level. A first control unit sends out a selected question to a second control unit which answers the same in the context of a sequence control. The second control unit sends the formed answer back to the first control unit which then, on the basis of a comparison of the formed answer to the expected answer, determines the freedom from fault of the second control unit. Correspondingly, the first control unit is monitored by the second control unit via communication.

Abstract: A sensor failure accommodation system includes a control computer receiving a sensor signal corresponding to an engine operating condition, and estimating a value of the engine operating condition as a function of one or more engine operating parameters different than the engine operating condition. The computer is operable to control one or more air handling mechanisms as a function of a final engine operating condition value, and if the sensor producing the engine operating condition signal is error free the final engine operating condition value is the engine operating condition signal. If the sensor producing the engine operating condition signal has failed, the final engine operating condition value is the engine operating condition estimate, and if at least one sensor producing the one or more engine operating parameters has also failed, the final engine operating condition value is a commanded or other definable engine operating condition value.

Abstract: A control system for controlling an internal combustion engine having an exhaust gas recirculation mechanism consisting of an exhaust gas recirculation passage connected between the exhaust passage and the intake passage of the engine, and an exhaust gas recirculation valve provided in the recirculation passage for controlling an exhaust gas amount to be recirculated. Control parameter(s) of the engine are calculated according to operating conditions of the engine. An amount of change in the intake pressure between when opening the exhaust gas recirculation valve and when closing the exhaust gas recirculation valve, in the fuel-cut operation, is calculated. The abnormality of the exhaust gas recirculation mechanism is determined according to the amount of change in the intake pressure. The engine is controlled by using the control parameter suitable for a closed condition of the exhaust gas recirculation valve during a predetermined time period.

Abstract: An internal combustion engine has an electromechanical valve train, in which the valve control device houses not only the output stage for the ignition system and the output stage for the fuel injection system. The valve control device can rapidly prevent the ignition of the air/fuel mixture in the cylinder affected by the valve failure of an electromechanically actuated valve. Moreover, all output stages important for the thermal combustion process are combined in one control device, which is advantageously connected to a water-cooling system.

Abstract: A fuel supply control system for controlling a fuel amount to be supplied to an internal combustion engine having an exhaust gas recirculation mechanism comprising an exhaust gas recirculation passage connected between an intake pipe and an exhaust pipe, and an exhaust gas recirculation valve provided in the exhaust gas recirculation passage, is disclosed. The fuel amount to be supplied to the engine is corrected according to a pressure difference between an intake pressure detected when opening the exhaust gas recirculation valve and an intake pressure detected when closing the exhaust gas recirculation valve.

Abstract: The invention relates to a method for limitation of at least one controllable operating parameter that can cause ageing of at least one component or one material in connection with an engine. The method includes the steps of determination of a maximum limit value allowed regarding the operating parameter and control of the engine so that the limit value is not exceeded, thereby limiting ageing of the component or material. The invention includes continuous determination of a measure that corresponds to the degree of impairment of the component that depends on ageing, wherein said determination of the limit value is made depending on the measure. The invention also relates to an arrangement for accomplishing this method.

Abstract: A method for controlling an engine of a system having an air-charger system connected to the engine includes sensing air-charger system temperature; comparing the air-charger system temperature to a temperature threshold; and adjusting an engine control parameter when the air-charger system temperature exceeds the temperature threshold. A system for controlling engine operation is also provided.

Abstract: A method and a device for driving at least one load, in particular a solenoid valve for controlling the injection of fuel in an internal combustion engine. Using at least one switching element, the current flowing through the load is controlled as a function of a control signal. In the presence of at least one safety signal, the load is driven such that it adopts a safe state.

Abstract: An ECU is equipped with engine control microcomputer for executing engine control and a throttle control microcomputer for executing throttle control. The engine control microcomputer is programmed to execute a monitor program. A timer equipped in the engine control microcomputer is set with a predetermined time each time when the monitor program is executed normally. The timer switches automatically its output logic level of a port from high to low, when the time count reaches zero.

Abstract: A method and system adjusts powertrain controls to avoid significant deviations from set speed during speed control operation. Low vacuum conditions of a reservoir vacuum resulting from high load conditions are detected and eliminated through the initiation of downshifts. Detection is based on the determination that speed control mode has been initialized, the throttle is extended, vehicle acceleration is low, and there has been a significant deviation from set speed. The downshift creates an increase in engine rpm and a reduction in throttle angle to increase the manifold vacuum and thereby recharge the reservoir vacuum and eliminate the low vacuum condition. The transmission can be returned to normal operation and the pre-adjustment gear upon elimination of the low vacuum condition or the occurrence of a driver override condition.

Abstract: A control device includes at least two control units that each generate actuating signals for actuating at least one disjunctive actuator. The control units are connected to one another through monitoring lines. A superordinate control unit controls the other control units and is also connected through monitoring lines to at least one of the at least two control units. The monitoring lines are provided for passing on monitoring signals. Using the monitoring signals, the individual control units monitor the fault-free functioning of another control unit.

Abstract: An internal combustion engine has an electromechanical valve train, in which the valve control device houses not only the output stage for the ignition system and the output stage for the fuel injection system. The valve control device can rapidly prevent the ignition of the air/fuel mixture in the cylinder affected by the valve failure of an electromechanically actuated valve. Moreover, all output stages important for the thermal combustion process are combined in one control device, which is advantageously connected to a water-cooling system.

Abstract: A method and an arrangement for operating internal combustion engines is suggested which is operated in at least one operating state with a lean air/fuel mixture. The fuel mass, which is to be injected, or the injection time, which is to be outputted, is determined in dependence upon a desired value. For monitoring the operability, the actual torque of the engine is determined on the basis of the fuel mass, which is to be injected, or the injection time, which is to be outputted, or the outputted injection time and compared to a maximum permissible torque and a fault reaction is initiated when the actual torque exceeds the maximum permissible torque. Parallel to the above, a quantity, which represents the oxygen concentration in the exhaust gas, is compared to at least one pregiven limit value and a fault reaction is initiated when this quantity exceeds the limit value.

Abstract: In an electronic control for a hybrid vehicle which is driven either by an engine or an electric motor, or both, possible failures in an ignition system and a rotation sensor system are detected during a period in which the engine is rotated by the motor with no fuel supply. Only after no failure is found, the engine is started by supplying fuel and performing ignition. Thus, the fuel supplied to the engine is ignited without fail, and unburned gas release to the atmosphere is surely prevented. Also, good drivability is maintained. In case the invention is applied to a series hybrid vehicle which is driven solely by an electric motor powered by a battery which is charged by an electric generator driven by an engine, the ignition system is diagnosed when the engine is not rotating. After it is determined that there is no failure in the ignition system, the engine is started.

Abstract: Controlling an internal combustion engine which has an additional component provided in its exhaust gas conduit including a turbine and turbo of a turbo charger, includes enriching a mixture at a high throughput, determining a main filling signal by a main filling signal sensor and a substitute filling signal by a substitute filling sensor, converting the substitute filling signal into a control signal for at least one value selected from the group consisting of an air supply, a fuel supply and an ignition time point, such that the substitute filling signal is greater than the main filling signal by at least one protective factor, and selecting the protective factor so that at high throughput a change of the mixture toward a fattening is performed.

Abstract: A central processing unit (CPU) monitoring system is provided for detecting abnormality in a CPU 1. In the CPU monitoring system, a proposal data is outputted from a proposing section 11 in a monitoring unit 10 to a converting section 12 of the unit 10 and an exercise calculating section 3 in the CPU 1. In the converting section 12, a designated converting operation is carried out to output an expected value data to two judging sections 13, 4 in the monitoring unit 10 and the CPU 1. When the expected value data does not coincide with the calculation result, it is judged at the sections 13, 4, that the CPU 1 has an abnormality, so that a fail-safe operation is performed to cut off the power supply for a motor 8. The converting section 12 has only to convert the proposal data into the expected value data simply. Consequently, even if the CPU 1 is subjected to modification in control specification, there is no need to change the contents of the CPU 1.

Abstract: A controller for an internal combustion engine detects a demand variable showing a demand from a driver, and controls an intake air volume to the internal combustion engine according to the detected demand variable. When trouble is detected in a system controlling the intake air volume, the controller switches a driving control of a vehicle to a emergency driving mode. In the emergency driving mode, the controller keeps the intake air volume to the internal combustion engine constant. The controller calculates a emergency driving control variable according to the detected demand variable, and controls the driving of the vehicle according to the calculated emergency driving control variable. The emergency driving control variable is a control variable different from the intake air volume. Thus, in the emergency driving mode, the driving of the vehicle can be controlled by the control variable different from the intake air volume, and a better drivability is ensured.

Abstract: A control system for controlling an internal combustion engine having an exhaust gas recirculation mechanism consisting of an exhaust gas recirculation passage connected between the exhaust passage and the intake passage of the engine, and an exhaust gas recirculation valve provided in the recirculation passage for controlling an exhaust gas amount to be recirculated. Control parameter(s) of the engine are calculated according to operating conditions of the engine. An amount of change in the intake pressure between when opening the exhaust gas recirculation valve and when closing the exhaust gas recirculation valve, in the fuel-cut operation, is calculated. The abnormality of the exhaust gas recirculation mechanism is determined according to the amount of change in the intake pressure. The engine is controlled by using the control parameter suitable for a closed condition of the exhaust gas recirculation valve during a predetermined time period.

Abstract: An arrangement and a method for calibration or monitoring a combustion process in a combustion engine, wherein an injection device injects fuel into a combustion chamber of the combustion engine. A noise-detecting sensor at the engine detects a parameter which derives from the noise generated during the combustion process. A control unit receives signal values representing the parameter from the sensors and receives information on the rotation position of a crankshaft in the combustion engine. The control unit determines the crankshaft position when the fuel is injected into the combustion chamber. Thereafter the injection device can be calibrated. Detecting the noise from combustion also makes it possible to assess whether combustion takes place at the intended time.

Abstract: An calibration optimization method for a direct injection spark ignition (DISI) engine with a lean NOx trap is disclosed. The method relies on a fixed structure optimization whereby reasonable powertrain operating policies are assumed and parametrized with a small number of variables with some of the variables playing the role of parameters for an inner loop optimization of an outer loop/inner loop two-stage optimization formulation. The values of the parameters are determined via a numerical solution of the resulting (outer loop) optimization to minimize the fuel consumption over the drive cycle subject to emission constraints.

Abstract: A method and system for determining degradation of fuel pump performance in a locomotive having an internal combustion engine is provided. The method allows for monitoring a signal indicative of a fuel value delivered by the fuel pump and for adjusting the value of the monitored signal for deviations from an estimated nominal fuel value due to external variables to generate an adjusted fuel value. The method further allows for comparing the value of the adjusted fuel value against the nominal fuel value to determine the performance of the pump.

Abstract: A method for controlling an internal combustion engine with the aid of an engine control unit, having actuators for the electromagnetic valve control, as well as additional actuators, wherein each cylinder head has a separate actuator control unit, which is connected via a data bus to the engine control unit.

Abstract: A method for operating an internal combustion engine, in particular of a motor vehicle, in which fuel is injected either in a first operating mode during a compression phase, or in a second operating mode during an intake phase, directly into a combustion chamber. In both operating modes, the fuel mass injected into the combustion chamber is controlled and/or regulated as a function, among other things, of a calculated reference torque to be delivered by the internal combustion engine. A true torque delivered by the internal combustion engine and a permissible torque are determined; and the true torque is compared to the permissible torque.

Abstract: An electronic control system has an engine control computer and a throttle control computer. The engine control computer has a monitor program separate from an engine control program. The monitor program is for checking the operation of the throttle control computer and executed by the engine control computer as a timer interrupt routine. A watch dog timer is connected to the engine control computer to detect malfunction of the monitor program in response to a watch dog pulse produced during the execution of the monitor program. The watch dog timer disables an electronic throttle control by the throttle control computer upon detection of the malfunction of the monitor program. At the same time, the engine control mode is changed from a normal engine control to an engine power reduction control thereby to ensure a limp-home operation of the engine.

Abstract: An automatic engine power control system for a motor vehicle has a power control element which is uncoupled from the operation of the vehicle accelerator pedal, and can be controlled as a function of various operating parameters by means of an electronic control unit. In the event of a failure, an emergency driving mode is implemented with a power which is reduced by defining a maximum permissible engine torque. When the driver's power demand is increased during an emergency driving mode, the power is automatically controlled by means of the power control element such that, at the point in time of the increase of the power demand, an immediate acceleration is initiated, and if the increased power demand is maintained, a defined acceleration course is implemented until the maximum permissible engine torque is reached.

Abstract: A first microprocessor controls an actuator according to a control program stored in a program storage memory, using a learnt value stored in a learning value storage memory. The learnt value is updated in response to an action of the actuator. A second microprocessor is connected to the first microprocessor to replace the control program with another control program which also has a function to initialize the learnt value. However, when the learnt value has been updated, the first microprocessor prohibits the second microprocessor from replacing the control program, thereby preventing the impairment of control response due to initialization of the learnt value.

Abstract: A diagnostic system for an engine is provided for which a plurality of annunciators are energized according to particular fault code sequences. A self-diagnosis mode is controlled by use of the vehicle throttle. The self-diagnosis mode can be initiated by a predetermined number of cycles of the vehicle throttle, in which a cycle corresponds to depressing and releasing the throttle beyond upper and lower limits. In one aspect of the invention, a timer is used to determine whether the predetermined number of throttle cycles occurs within a fixed time limit. If not, then the self-diagnosis mode is not activated. Once the self-diagnosis mode is activated, subsequent cycles of the vehicle throttle will increment the annunciators among the sequential fault codes.

Abstract: A diagnostic device and method for an exhaust gas recirculation system achieves a prompt diagnosis without reducing accuracy. The diagnosis of an exhaust gas recirculation system, which is carried out based on an EGR temperature and an operating signal for operating an EGR control valve, is prevented when the EGR temperature is greater than a predetermined temperature, except when a rising rate of the EGR temperature is greater than a predetermined value.

Abstract: A simplified fault logic accomodation control which utilizes fuzzy logic to assist in calculating a preselected weighted average of the values of two redundant sensors that are sensing the same parameter. A synthesized, third, predicted value of the parameter is used in the fuzzy logic to arbitrate between the two sensed values.

Abstract: In order to achieve a correct and efficient diagnosis on an engine, it is important to search a steady state of engine operation correctly and frequently as far as possible. In this invention the steady state operation is judged by checking whether or not the average value of an engine parameter for a predetermined monitoring period is within a predetermined restriction width, whereby so many chances of monitoring for diagnosis can be provided.

Abstract: A control method as described, the method being intended for use controlling the operation of a compression ignition internal combustion engine having an accelerometer associated therewith and arranged to sense vibrations of the engine, and a monitor arranged to monitor the output signal of the accelerometer, by monitoring the output signal during a detection time interval and a reference time interval, using the output signal during the reference time interval to compensate for background noise, and using the noise compensated signal in controlling the operation of the engine.

Abstract: A sensor which detects whether or not an engine output shaft and a vehicle drive shaft are in a predetermined connection state, is subjected to a fault determination when a predetermined condition holds. When the engine output shaft and vehicle drive shaft are constantly in this connection state from when the engine starts to when the above condition comes to hold, it is determined that a fault has occurred in the sensor. It is also determined whether or not the vehicle is running when the engine starts, and when the vehicle is running when the engine starts, fault determination is prohibited so as to avoid incorrect results.

Abstract: Internal combustion engine air/fuel ratio control responsive to low voltage operating conditions of an electrical system maintains stable, precise air/fuel ratio conditions under electrical system fault conditions affecting operation of fuel control components including fuel pumps, fuel injectors, and drivers therefor. Electrical system operating voltage is monitored and when a voltage drop below a voltage threshold associated with reliable engine cylinder air/fuel ratio control is diagnosed, the air/fuel ratio smoothly transitions to a reduced engine performance operating mode which, at least for high engine output power requests, limits fueling and airflow to the engine cylinders to a level that may be accurately, reliably supported by the fuel control system components under their reduced electric drive signals. The reduced performance operating mode is maintained while the fault condition persists.

Abstract: A control device of the internal combustion engine has a first arithmetic unit and a second arithmetic unit. The arithmetic units process a control program with a first, second and third program level. In the second program level an actuation signal is monitored, and a first emergency operating function is activated in the first program level if the second program level has detected an implausibility of the actuation signal. The third program level is caused to carry out a second emergency operating function if, while the first emergency operating function is being carried out in the first program level, the implausibility of the actuation signal continues to be detected.

Abstract: The present invention securely prevents the erroneous switching of the combustion mode to the stratified charge combustion, and avoids deterioration of the driving performance. In order to do so, apart from a software determination device inside a main CPU for performing the permission determination on the switching to the stratified charge combustion based on an input signal related to the engine drive condition, a hardware detection circuit (gate array) is equipped for performing the permission determination on the switching to the stratified charge combustion mode based on the input signal related to the engine drive condition. The main CPU is equipped with a combustion mode order device for finally ordering the stratified charge combustion by permitting the switching to the stratified charge combustion only when the two permission determinations both permit the switching to the stratified charge combustion.

Abstract: A control system has a plurality of processors connected in a series order. Each of the processors monitors a preceding processor for operating abnormalities. If an abnormality is detected the operation of abnormal preceding processor is terminated and a resetting unit resets the abnormal processor along with any preceding processor to the abnormal processor in the series order. The system also includes failsafe mechanisms to insure failsafe operation of the vehicle when the operation of an abnormal processor is terminated.

Abstract: An accelerator sensor detects an operation amount of an accelerator pedal. A microcomputer determines if a relation between the detected operation amount and an operation of the accelerator mechanism deviates from a predetermined normal relation, responsive to an ON signal from an idle switch or an ON signal from a power switch. When the relation deviates from the predetermined normal relation, the detected operation amount is corrected by the deviation from the predetermined normal relation in order to cause the relation between the operation amount and the operation of the accelerator mechanism to match the predetermined normal relation.

Abstract: A device is provided for detecting a malfunction of an air fuel ratio sensor disposed downstream of a catalytic converter in an exhaust passage of an engine. The device calculates a differential value of a sensor output with respect to time. Then the device compare the differential value of said sensor output with a predetermined value and calculate a frequency of the differential value of the sensor output which exceeds the predetermined value. Then the device compares the frequency with a predetermined value and determine that the sensor is malfunctioning if the frequency does not exceed the predetermined value.

Abstract: The present invention relates to a circuit for processing internal combustion engine crank angle sensor signals. The construction is such that an output side circuit of a crank angle sensor outputs a crank angle signal with a high level pulse generated in response to the switching on and off of a switch element connected in series to a power source. Moreover, an input side circuit of a signal processing circuit includes a voltage reducing circuit which pulls down a power source voltage applied at the time of pulse generation, to a predetermined voltage and supplies this to an arithmetic processing section. Consequently, the output signal at the time of no pulse generation becomes a low level so that influence from noise is minimized. Also, since the input signal at the time of momentary disconnection of terminals connecting between the crank angle sensor and the processing circuit is a low level, then erroneous recognition of pulse generation is prevented.

Abstract: An onboard diagnostic mechanism for a sealed vehicle fuel delivery system. By controlling fuel system valves, the electronic engine controller (EEC) periodically subjects the sealed system to an initial vacuum level, then monitors the pressure increase due to evaporative effects during a predetermined test interval. Excessive deviations in measured pressure compared to predetermined criteria produce indications of potential undesired operational conditions. To prevent fuel sloshing which results from aggressive driving or rough roads from producing false output indications, the instantaneous system pressure is compared with a rolling average of tank pressure to produce a difference signal indicative of fuel sloshing. If the resulting difference signal exceeds a predetermined threshold, the monitoring process is aborted in favor of a later test after the fuel sloshing condition terminates.