Abstract: In an engine using fuel mixture of gasoline and methanol, the present control system compensates a detection value of a blend ratio sensor with a detection value of a knock sensor, or causes trouble detecting means to detect a failure of the blend ratio sensor and memories the blend ratio immediately before the failure as an assumed blend ratio and compensates the stored value with the detection value of the knock sensor, whereby the engine control is executed based on the control blend ratio and the ignition timing acquired through the compensation.

Abstract: A projection positioned in the center of a concave section of a toroidal combustion chamber is divided into a section with a steep slope extending from the bottom to the head surface and a section with a gentle slope. The head surface is in the form of a flattened conical trapezoid. Because of its shape, the projection makes it possible for the air which is close to the center section to flow close to the surface of a side wall of the concave section. The air which had been at the center section is added to the amount of air supplied for combustion and is mixed with the fuel in the vicinity of the surface of the side wall of the concave section. By setting the angle at which the air flows along the side wall surface (re-entrant angle) in the combustion chamber, the flow of the air close to the side wall surface is made turbulent, which improves the agitation of the fuel.

Abstract: An air/fuel ratio control system is provided for use with an internal combustion engine. The system includes a first air/fuel ratio detector arranged on an upstream side of a catalytic converter so as to detect the air/fuel ratio of the engine from components of exhaust gas, a second air/fuel ratio detector arranged in the exhaust system and having a detection response speed slower than the first air/fuel ratio detector, a device for controlling the air/fuel ratio of the engine on the basis of results of a comparison between a detection value from the first air/fuel ratio detector and a predetermined first reference value, a device for effecting a correction to the control of the air/fuel ratio by the air/fuel ratio control device on the basis of results of a comparison between a detection value from the second air/fuel ratio detector and a predetermined second reference value, and a device for shifting the second reference value to a lean air/fuel ratio side in a specific operation state of the engine.

Abstract: A control of an idling control valve which is arranged in a bypass air passage bypassing a throttle portion of a suction passage of an internal combustion engine and controlled by electric signals is carried out by setting an upper limit of electric current flowing in a drive circuit for the idling control valve, suppressing the electric current flowing into the drive circuit not to exceed the upper limit when an usual idling is effected, and releasing the electric current from the upper limit to flow electric current of a value larger than the upper limit to the drive circuit for a short time at a certain time of engine operation and/or at regular intervals.

Abstract: A fuel control apparatus for an internal combustion engine comprises, an air intake quantity detector to detect a parameter related to an air intake quantity for the engine, a filter for filtering an output from the air intake quantity detector, a switch for changing the filter coefficient of the filter on the basis of operational conditions of the engine, a controller to control a fuel supply quantity to the engine on the basis of the output of the filter, and a corrector to correct the fuel supply quantity depending on an error between an output from the filter and another output from the same at a predetermined crank angle when the error exceeds a predetermined value, wherein the predetermined value is changed depending on the filter coefficient which is changed by the switch.

Abstract: A temperature compensated ignition control device wherein the temperature sensor is mounted on the circuit for the spark advance and the complete assembly is mounted in proximity to a portion of the engine for sensing its temperature and advancing the spark during cold starting.

Abstract: A fuel injection apparatus has a piezoelectric element for generating a high-pressurized air-fuel gas mixture. The piezoelectric element is arranged at a side of a pumping chamber, and a diaphragm is arranged between the piezoelectric element and the pumping chamber. The piezoelectric element produces a pumping function in accordance with a current signal.

Abstract: In a fuel control system for an internal combustion engine, fuel is injected in a quantity the direct delivery part of which provides a desired quantity of fuel to be actually fed to the engine together with the drawn part of the intake-manifold wetting fuel. The quantity of the intake-manifold wetting fuel on the basis of which the quantity of the drawn part is calculated is calculated on the basis of the quantity of the adhering part of the fuel which was injected by the preceding injection and the quantity of the residual part of the preceding intake-manifold wetting fuel.

Abstract: An air/fuel ratio control system is provided for use with an internal combustion engine. The system includes an air/fuel ratio detector arranged on an upstream side of a catalytic converter so as to detect the air/fuel ratio of the internal combustion engine from components of exhaust gas, a device for controlling the air/fuel ratio of the internal combustion engine on the basis of results of a comparison between a detection value from the air/fuel ratio detector and a predetermined reference value; and a device for shifting the reference value to a lean air/fuel ratio side in a specific operation state of the internal combustion engine.

Abstract: Mechanical emergency override assembly for an electronic throttle valve assembly of the type having a servomotor to control the closure of the throttle valve flap in the range of from 0.degree. to about 4.degree.-15.degree. in accord with predetermined criteria. The mechanical emergency override improvement comprises dual stop assemblies, which in emergency operation are counteractive when disabled to provide a mechanical stop at about a 5.degree. opening and permit a snap linkage between the setting unit and throttle flap arm to be engaged for mechanical (gas pedal) operation throughout the full range of opening. The servo is spring linked to a second throttle flap arm and can disengage this mechanical override. Normal throttle wider opening, and emergency operation at angles from 5.degree. to full open, are controlled by the driver actuating the gas pedal, but the actual valve flap opening angle is microprocessor-controlled via the servo to be less than the pedal angle on a predetermined curve.

Abstract: An engine throttle control system comprises a control unit for controlling the position of a throttle by means of a motor in response to a position transducer actuated by an accelerator pedal. A detector detects when a signal produced by the control system is outside a range of acceptable values and, for instance, shuts down the engine. In one embodiment, the detector detects whether power supplied to the motor is less then a value expected on the basis of the position and speed of movement derived from the output of a throttle position sensor.

Abstract: An improvement in an internal combustion engine of type in which a piston reciprocates in a cylinder to compress a charge of fuel within a combustion chamber within which the charge of fuel is ignited to burn and drive the piston through a power stroke, the improvement providing the combustion chamber with a first stage chamber and a second stage chamber communicating with one another through a valve operated in synchronism with reciprocation of the piston to close communication between the first stage chamber and the second stage chamber as the piston approaches top dead center so as to enable ignition and burning of a first portion of the charge of fuel in the first stage chamber, isolated from a second portion of the charge of fuel in the second stage chamber, and then to open communication between the first stage chamber and the second stage chamber to effect ignition of the second portion of the charge of fuel in the second stage chamber by the combustion products of the first portion of the charge of fu

Abstract: An apparatus for controlling ignition timing in an internal combustion engine wherein the ignition timing is controlled such that a crank angle at which an increased rate of pressure in a cylinder is maximized coincides with a target value, e.g., an MBT point or the like. The apparatus detects an occurrence of incorrect ignition in response to a signal indicative of pressure in the cylinder and inhibits feedback control from being carried out for the ignition timing when an occurrence of incorrect ignition is detected. The crank angle, at which an increased rate of pressure in the cylinder is maximized, is calculated in response to a signal indicative of pressure in the cylinder, a reference pulse transmitted from a crank angle sensor and a pulse transmitted per 1.degree. of a crank angle of the crankshaft. The target value is set to a value by which a maximum torque is obtainable within a range where no knocking occurs.

Abstract: An ignition timing control apparatus for an internal-combustion engine comprises a resonance-type acceleration sensor for detecting vibration acceleration, a discriminating means for eliminating noise signal components from the output of the acceleration sensor and selecting knocking signal components, a reference ignition timing signal generating means for generating a reference ignition timing signal, a phase shifting means for shifting the phase of the reference ignition timing signal in accordance with the output of the discriminating means, a switching means for interrupting power supply to an ignition coil corresponding to the output of the phase shifting means; and an operating condition detecting means for applying a specific voltage to the acceleration sensor, and for verifying the operating condition of the acceleration sensor and the integrity of a connection between the output side of the acceleration sensor and the input side of the discriminating means from the responsiveness of the acceleration

Abstract: An electronic engine speed control particularly adapted for use in marine vehicles for maintaining engine speed in the event the load on the engine changes. The spark timing is adjusted only in the event the engine speed changes without a change in position of throttle valve of the engine. If the speed decreases under these conditions the spark is advanced and if the speed increases the spark is retarded.

Abstract: A diesel engine comprising a plurality of cylinders each having a precombustion chamber and a fuel injector. A first camshaft for driving intake valves and a second camshaft for driving exhaust valves are arranged on the cylinder head and extended in parallel to the longitudinal axis of the engine body. Each precombustion chamber and each fuel injector is arranged centrally between the first camshaft and the second camshaft.

Abstract: The electronic control module of the new generation of fuel injected internal combustion engines is adapted to compensate for variations in operating temperature or pressure readings among the cylinders, so that cylinders having a low temperature or pressure reading relative to the others will receive an increased flow of injected fuel, whereas cylinders running at a relatively high temperature and pressure compared to the other cylinders will receive a decreased fuel injection, so that the cooler cylinders run hotter and the hotter cylinders run cooler. The uniformity of power delivery among the cylinders, which is the object of the operating temperature and pressure adjustment, yields a more even delivery of power and a more efficient use of fuel.

Abstract: A control apparatus for an engine comprises an air-fuel ratio sensor for detecting an air-fuel ratio on the basis of an exhaust gas component from the engine, a fuel controller which receives an output from the air-fuel sensor so as to feed-back-control a fuel quantity in response to the operating conditions of the engine so that the air-fuel ratio becomes optimum, a fuel supplier to supply fuel on the basis of a signal from the fuel controller, and a target advance angle value changer which selects a fixed advance angle value for ignition timing independent from the operating conditions of the engine when an instruction signal for adjusting the ignition timing is generated from an ignition timing adjustment signal generator, an ignition device which effects ignition in accordance with an output from the target advance angle value changer, and a feed-back control stopping device which stops the feed-back control of the air-fuel ratio when the instruction signal is generated from the ignition timing adjustment

Abstract: A fuel combustion system for an Otto-cycle internal combustion engine including a main combustion chamber and an auxiliary combustion chamber. Timing of ignition is effected by opening a control valve device during a latter portion of the compression phase which permits a pressurized combustible mixture to flow from the main combustion chamber and into the auxiliary combustion chamber where the combustible mixture therein is ignited. Hot burning gases emanating from the auxiliary combustion chamber through a suitable directing device provide single or multiple and penetrating sources of ignition for the bulk of the combustible mixture present in the main combustion chamber. This arrangement provides a very reliable and long life ignition system for Otto-cycle engines and is especially advantageous for engines whichburn a relatively lean combustible mixture.

Abstract: An ignition timing control apparatus including a knocking sensor, wherein when knocking occurs, the ignition timing common to all cylinders is delayed by a predetermined amount and when knocking occurs at one of the cylinders and then again at the same cylinder, the ignition timing is delayed by an amount larger than the predetermined amount.