Abstract: An actively controlled suspension system comprises a hydraulic cylinder disposed between a vehicle body and a suspension member rotatably supporting a vehicular wheel, the hydraulic cylinder defining therein a working chamber, a pressure source including a pump associated with an automotive internal combustion engine to be driven by the output of the engine, a pressure control valve having a first port connected to the working chamber, a second port connected to the pressure source via a supply line and a third port connected to the pressure source via a drain line, the pressure control valve being variable of valve position for selectively establishing and blocking fluid communication between the first port and the second port and between the first port and the third port for adjusting fluid pressure in the working chamber for controlling suspension characteristics, a vertical acceleration sensor for monitoring vertical acceleration exerted on the vehicular body to produce a vertical acceleration indicative

Abstract: A fuel injection control system performs fuel cut-off operation intermittently so that engine output torque may not fluctuate at significant level to cause jerking at the transition from fuel injecting state to fuel to fuel cut-off state and at fuel resumption after fuel cut-off. Intermittnetly cutting off the fuel delivery for the engine cylinders, engine output torque drop at the fuel injecting state and fuel cut-off state can be reduced for reducing magnitude of jerking.

Abstract: A system and method for automatically running a vehicle at a desired cruising speed, in which a running resistance of the vehicle is always derived, a target opening angle of a throttle valve of a vehicular engine which can run the vehicle at a desired constant acceleration and/or at the desired cruise running speed is derived under the derived running resistance, and the opening angle of the throttle valve is controlled in a feedforward control mode so as to coincide with the target opening angle. The automatic cruise running system and method can achieve no variation of vehicle speed when the vehicle runs on a rugged road.

Abstract: A control system for an automatic transmission is disclosed. The control system features detecting output shaft torque, evaluating a pattern of variation detected of the output shaft torque during shifting, scheduling a variation of fluid pressure to be supplied to a friction element in response to the result of evaluation, and regulating a fluid pressure supplied to the friction element in response to the variation of fluid pressure scheduled.

Abstract: A method of and an apparatus for alleviating shocks occurring during a gear shift of an automatic transmission are disclosed. In order to alleviate shift shocks, the output torque of the engine is reduced upon the lapse of a delay time from the occurrence of a shift command and before the interruption of lock-up action of the torque converter. This delay time is updated using a factor determined by substracting a predetermined constant from a length of time from the occurrence of the shift command to an instant when an actual engine revolution speed agrees with a value of an estimated engine revolution speed variation during the interruption of lock-up action. The engine revolution variation is estimated based on an actual engine revolution speed variation trend taking place immediately after the occurrence of the shift command but before the interruption of lock-up action. The delay time updated in this manner is used during a gear shifting operation initiated by a subsequent shift command.

Abstract: A lock-up control system for a lock-up type automatic transmission is disclosed where the transmission output torque is monitored and the interruption of the lock-up action is executed after the transmission output torque has satisfied a predetermined condition after generation of a command for shifting within the transmission.

Abstract: A method of controlling a power train including an engine and a transmission wherein various input data are generated and among the various input data, a predetermined input data is common in controlling the engine and the transmission.

Abstract: A fuel injection detecting system is used with a diesel engine having a fuel injection nozzle, the nozzle including a movable member for effecting fuel injection into the engine when the valve member is displaced from its normal position and interrupting fuel injection when the valve member is returned to its normal position. The detecting system includes a sensor for sensing displacement of the valve member and generating a signal indicative thereof. A comparator is provided to compare the signal from the sensor with a reference signal and to generate a signal indicative of fuel injection via the nozzle. The detecting system also includes a device for preventing the fuel injection signal from including components unrelated to fuel injection via the nozzle. This device may disable the sensor for a predetermined period immediately after the first major displacement of the valve member.

Abstract: A lock-up control wherein a temporary release timing of a bridge clutch is adjusted by learning control. According to the learning control, a difference between an estimated engine revolution speed after an instant when the bridge clutch is temporarily released and an actual engine revolution speed is obtained, an integral value is obtained by integrating the difference, and the temporary release timing is adjusted or corrected in such a manner as to decrease a difference between the integral value and a predetermined value.

Abstract: In an engine speed sensing device, angle pulses produced when the crankshaft rotates through a predetermined angle are counted by a counter for a predetermined interval. The count of angle pulses is read into a central processing unit of a digital computer at the end of each set time interval in response to a control signal which both updates the angle pulse count and signals the processing unit to read the count.

Abstract: A fuel injection control system is disclosed which generates a fuel-injection command pulse signal having a constant repetition rate and a pulse width calculated from an algebraic relationship defining fuel-injection pulse-width as a function of engine air flow. The system can eliminate the need for engine-speed calculations and increase system reliability.

Abstract: A fuel injection control system for a direct injection type internal combustion engine having a plurality of fuel injection valves installed in respective combustion chambers.

Abstract: A fuel injection control device includes a microcomputer which determines a fuel injection amount based on the engine operation parameters. The microcomputer also actuates the fuel injection valve to open earlier in relation to the normal timing of fuel injection in response to turning on the starter switch. The fuel injection amount corresponds to the duration of opening of the fuel injection valve, and the opening duration of the fuel injection valve is defined by a driving signal and a stopping signal. The driving signal is generated at given angles of crank revolution. The driving signal is generated in response to a preset number of crank angle pulses, which is varied between the first fuel injecting operation and subsequent fuel injecting operations. The fuel injection timing of the first injecting operation is shorter than that of the remainder for improving start-up characteristics of the engine responsive to turning on the starter switch.

Abstract: An electronic engine controller is disclosed for controlling selected operations of an internal combustion engine based upon engine operating parameters. The engine controller comprises a load sensor for generating an analog signal indicative of the value of engine load, and an A/D converter for converting the engine load indicative analog signal into digital form. The A to D conversion is synchronized with engine rotation by a data sampling circuit which includes a first circuit for determining, based upon engine speed, a desired position of an engine crankshaft with respect to an engine crankshaft reference position, and a second circuit responsive to the engine crankshaft rotating to the determined engine crankshaft position for providing a command signal to the A/D converter which thereby initiates the A to D conversion process.

Abstract: A fuel supply control system for an internal combustion engine having a fuel supply cut-off function is equipped with means for increasing in amount, the fuel supply of fuel in response to resumption of the supply of fuel subsequent to the fuel cut-off operation, thereby compensating for a fuel delivery delay characteristic which otherwise would occur upon the resumption of the supply of fuel. The increase in fuel is determined in response to at least one of variables which affect the rate of evaporation of the fuel adhered to the inner wall of the intake manifold during the fuel cut-off operation.

Abstract: A digital control system for an internal combustion engine uses a two stage register. The register is used to store digital data representative of sensed engine operating conditions and to feed such data to a programmable digital computer for processing. Processing time is improved by reading only one register containing the most significant data bits of the stored data for engine parameters having a relatively narrow dynamic range and reading both registers, containing all data bits of the stored data for engine parameters having a relatively large dynamic range.

Abstract: An electronic engine control system has a pressure sensor communicating both to the intake manifold and the ambient air via a valve means selectively introducing either the intake vacuum or the ambient air into the pressure sensor. The control system further includes a valve control means for controlling the operation of the valve means for selectively communicating the pressure sensor to the intake manifold and the ambient air. The valve control means is incorporated in a controller for determining the control value and adapted to produce a control signal to be supplied to the valve means in order to electrically control the valve motion.

Abstract: An idling rpm control device for an internal combustion engine for controlling idling rpm of the engine depending upon operating parameters, comprises range detecting means for detecting a range of variations in idling rpm of the engine. According to the invention if an rpm variation range is more than a predetermined value, an air-fuel ratio of mixture is controlled toward a richer mixture and as the result if the range is increased, the air-fuel ratio is controlled toward a leaner mixture, thereby minimizing the rpm variation range to improve operation of a vehicle equipped with the engine.

Abstract: A digital control system includes sensors, a multiplexer, an A-D converter, an input register, an arithmetic unit and a memory unit, an output register, an output unit, and actuators. The digital control system thus formed has an initializing routine stored in the memory unit in addition to the programs to execute normal control operations. This routine is executed immediately after the control system starts, so that predetermined temporary initial values can be set in the input or output register in order to obtain stable arithmetic operation results or to output a stable control signal even when the engine is not yet ready for outputting stable information. The control system thus improved can control an internal combustion engine stably immediately after the engine is started.

Abstract: A feedback control system using an oxygen-sensitive air/fuel ratio sensor which is disposed in induction passage for an IC engine downstream of a fuel supply device with the provision of an ignition means to burn a fractional portion of an air-fuel mixture in the induction passage such that the oxygen-sensitive sensor is exposed to a resultant combustion gas. The sensor is of the concentration cell type having a layer of solid electrolyte such as zirconia provided with two electrode layers, and constant DC current is supplied to this sensor to cause migration of oxygen ions through the solid electrolyte layer, whereby this sensor exhibits a slope output characteristic and can detect air/fuel ratios either above or below a stoichiometric ratio or exhibits an on-off characteristic and can detect the stoichiometric ratio depending on the intensity and flow direction of the current.