Abstract: A drive unit includes a hydrodynamic retarder having a rotor paddle wheel, a stator paddle wheel, and a housing surrounding the rotor and stator wheels. The unit includes a coolant cycle system for an internal combustion engine, the coolant for this coolant cycle also being a working medium of the retarder. The drive unit further includes a working medium container for the coolant. A first pipe connects a hydrodynamic center of the retarder to a valve. A second, leakage pipe is disposed between a working medium outlet of the retarder and the valve. A third pipe is disposed between the valve and the working medium container. The valve is designed such that in a first position, a conducting connection is established between the working medium container and the leakage pipe to provide for a pumping operation of the retarder. When the valve is in a second position, a conducting connection is established between the working medium container and the first pipe for a braking operation of the retarder.

Abstract: A method and apparatus of carrying out exhaust gas recirculation and compression release retarding is disclosed for use during both positive power and retarding operation of an internal combustion engine. Motion or energy is derived from an engine component and stored as potential energy. The stored energy is selectively applied to a valve actuator to carry out exhaust gas recirculation in an engine cylinder. The energy derived from the engine may be stored in the form of a compressed hydraulic fluid and selectively applied to the valve actuator with an electronically controlled trigger valve. The valve actuator may be a slave piston having an inner core and an outer sleeve capable of opening the valve of the cylinder in response to independent exhaust gas recirculation and compression release hydraulic systems.

Abstract: A combustion state detecting apparatus for an internal-combustion engine permits an improved signal-to-noise ratio of a knocking signal with a resultant improved controllability without adding to the load on an electronic control unit (ECU). The combustion state detecting apparatus is equipped with: a knocking signal processing circuit 20 which generates a knocking signal (K) according to an ionic current detection signal (Ei); and an ECU (2A) which detects the combustion state at a spark plug according to the ionic current detection signal and the knocking signal.

Abstract: An apparatus and method for dynamically controlling the temperature of a temperature controlled fluid passing through a heat exchanger where it is in thermal contact with a heat exchanging fluid by controlling accurately the volume of flow of the heat exchanging fluid through the heat exchanger.

Abstract: An insulated pre-combustion chamber of an internal combustion engine in which a piston is disposed in a cylinder for reciprocal movement relative to the cylinder. A cylinder head is provided over the cylinder and piston to form a main combustion chamber and the pre-combustion chamber is located in the cylinder head above the main combustion chamber. The pre-combustion chamber includes a pair of housing members and a retainer member all rigidly interconnected so as to provide an annular cavity between the retainer member and the upper housing member. Transfer passages are formed in the lower housing member for connecting the pre-combustion chamber with the main combustion chamber, and the cavity serves as an insulation area which cooperates with a separate and independent insulation member located between the lower housing member and the cylinder head for reducing the heat loss from the pre-combustion chamber.

Abstract: A number of embodiments of engine controls and engine control methods that employ instantaneous rate of combustion is the combustion chamber at a sensed parameter. Rate of combustion is determined by a linear equation based upon data arrived from combustion chamber pressures. The system is adapted to operate under different control modes so as to provide specific control for normal running, lean burn, maximum torque, cold starting, transient conditions, and/or knock control. The desired rate of combustion is achieved by engine control adjustments.

Abstract: The method includes the steps of generating a reference injection pressure value as a function of the speed of a diesel engine and of the quantity of fuel supplied to the engine, the reference injection pressure value defining an optimum injection pressure value for steady-state operation of the engine; generating an incremental injection pressure value as a function of the speed of the engine and the supercharge pressure of the engine, the incremental injection pressure value defining the maximum permissible variation in injection pressure between one engine cycle and the next during a transient operating state of the engine; and generating a desired injection pressure value as a function of the reference injection pressure value and the incremental injection pressure value, and such that the variation in injection pressure during the transient operating state of the engine does not exceed the maximum permissible value.

Abstract: An evaporative fuel control system for an internal combustion engine having a throttle valve includes a canister for adsorbing evaporative fuel generated in the fuel tank, a purging passage for purging evaporative fuel into the intake system of the engine, and a purge control valve for controlling a flow rate of the evaporative fuel to be purged into the intake system through the purging passage. An ECU sets an air-fuel ratio correction coefficient applied in air-fuel ratio feedback control, based on the concentration of a specific component in exhaust gases emitted from the engine, calculates a first learned value of the air-fuel ratio correction coefficient during execution of the air-fuel ratio feedback control, and controls the purge control valve such that the flow rate of the evaporative fuel is changed according to the calculated first learned value. A second learned value of the air-fuel ratio correction coefficient suitable for the transient operating condition of the engine is calculated.

Abstract: A cylinder-discriminating device for an internal combustion engine is provided. A reference timing signal is generated whenever the engine rotates through a predetermined rotational angle. A sparking voltage produced in a particular cylinder or a particular cylinder group in response to an ignition timing signal generated in synchronism with generation of the reference timing signal is detected. Cylinder discrimination is carried out to discriminate between cylinders or between cylinder groups, based on the sparking voltage detected. In another form, sparking voltages produced in respective cylinders or respective cylinder groups in response to an ignition timing signal generated in synchronism with generation of the reference timing signal are detected. Cylinder discrimination is carried out to discriminate between the cylinders or between the cylinder groups, based on the sparking voltages detected.

Abstract: A control system for determining combustion quality in a combustion chamber of an internal combustion engine. For each combustion chamber, first and second sampling windows are generated and ionic currents sampled utilizing the spark plug as an electrode. In response to the samples, indications of combustion quality such as misfire, late combustion, and slow combustion are provided. When the engine is operating in a lean burn mode, rich correction are made to the engine air/fuel ratio in an amount dependent upon the combustion quality indications.

Abstract: In an ignition controller for an internal combustion engine, an angle sensor includes a plurality of sensor means for individually outputting a pulse signal SGT1 corresponding to a first reference crank angle and a pulse signal SGT2 corresponding to a second reference crank angle and a control/arithmetic operation circuit includes a timing calculation means for calculating the timings at which ignition coils are controlled according to an operating state, count means for counting the number of the pulses of one of respective pulse signals which are detected between two continuous pulses of the other of them, reverse rotation discriminating means for discriminating the reverse rotation of the internal combustion engine based on the count values CA1 and CA2 of the respective pulse signals and control prohibition means for prohibiting the output of drive signals P1 and P2 in response to a reverse rotation discriminating signal to thereby prohibit ignition control in the occurrence of the reverse rotation by disc

Abstract: A control system for control of a vehicle prime mover includes an operation mode selecting device for selecting an operation mode, an accelerator operator, an operation mode detector for detecting the selected operation mode, an accelerator sensor for detecting an accelerator operating amount, an accelerator instruction value calculator for setting an accelerator instruction value to 0 unconditionally when the non-travel mode is selected and determining the accelerator instruction value based on a difference between the accelerator operating amount and a zero point value when the travel mode is selected, and an instruction value output calculator for determining and outputting an instruction value to the prime mover. The accelerator instruction value calculator sets the zero point value corresponding to the accelerator operating amount when the operation mode is changed.

Abstract: An engine operation control system for controlling ignition timing is disclosed. The system includes an electronic ignition control mechanism which operates to prevent ignition timing fluctuations resulting from irregular ignition pulses generated by instantaneous changes in rotational speed of a low mass flywheel when the engine speed is low by fixing the ignition advance in a low engine speed range. If engine acceleration is detected and the engine speed exceeds the low speed range, the system immediately increases the firing advance to a maximum value. If the engine speed exceeds the low engine speed range and no engine acceleration is detected, the system increases the firing advance linearly dependent upon engine speed.

Abstract: An engine feedback control system that includes an arrangement for setting lower tolerance limits on the rich and lean side in response to certain engine running characteristics so as to avoid unstable running as might occur under abnormal conditions when wider limits are set as with prior art type constructions. In addition, the increasing limit of fuel supply is set different from the decreasing limits so as to maintain the engine operation within the stable running area regardless of whether the conditions are normal or abnormal.

Abstract: A process for adaptive knock control for an internal combustion engine serves to retard the firing angle of an internal combustion engine when knocking occurs and then to advance the firing angle again. At the same time, the operation of the internal combustion engine is subdivided into various operating ranges; on leaving an operating range, a value is always saved as a retardation of the firing angle determined during operation in this range, and when starting up again in this range with load dynamics and/or speed dynamics also occurring at the same time, this saved value is output as the starting value for operation in this new operating range.

Abstract: A cylinder head cover for an internal combustion engine includes a plurality of contacts to which electronic parts of the engine are electrically connected. A control-unit connector has terminals to which an electronic control unit of the engine is electrically connected. A wiring portion has electric connections for interconnecting the contacts and the terminals of the control-unit connector, the wiring portion being integral with a wall of the cylinder head cover.

Abstract: A power balancing control to balance power output from a first and second engine that mutually drive a load is disclosed. The control includes an electronic control module electrically connected to a control panel. A first and second inlet manifold pressure sensor are associated with the first and second engine, respectively. An offset potentiometer is connected to the control panel. The control automatically adjusts power output of the second engine in response to the inlet manifold pressure of said first engine, the inlet manifold pressure of said second engine, and a signal produced by said offset potentiometer.

Abstract: A control apparatus for a multicylinder direct injection engine includes a fuel injection valve installed at each cylinder, a secondary intake air flow path provided for generating a slewing flow of intake air taken in an intake pipe, and a gas flow control valve for controlling the slewing flow generated in each cylinder by adjusting the flow rate of air flowing through the secondary intake air flow path. The control apparatus further includes an air/fuel controller for controlling the air/fuel control ratio in each cylinder by controlling fuel injection amount without using the opening of the gas flow control valve in the respective cylinder, for a first operational region of a small amount of accelerator operation.

Abstract: An ignition device for internal combustion engines with stationary high-voltage distribution, having at least one ignition coil (11), wherein a controllable switch (12) is disposed in series with the primary winding (10) and is triggerable by a control unit (13), wherein at least one high-voltage break-over diode (HKD), which comprises a plurality of break-over diode chips, is disposed in each secondary-side ignition branch between the high-voltage-side end of the secondary winding (14) and a spark plug (ZK1, ZK2, . . . , ZKn). A switch triggered by the control unit during the ignition coil charging operation makes a conditioning flow possible through the high-voltage break-over diode (HKD), which current in the high-voltage break-over diode floods the blocking region with charge carriers (38) (FIG. 1).

Abstract: The invention is directed to a method and an arrangement for controlling the torque outputted by an internal combustion engine while deactivating individual cylinders. A desired value for the torque outputted is obtained by suppressing and resuming the metering of fuel to at least one cylinder as well as by adjusting the ignition angle. The deactivation and reactivation of the cylinders and the adjustment of the ignition angle are synchronized.