Abstract: A failure diagnostic apparatus in an engine intake system is provided comprising a throttle valve arranged in an intake path of the engine, a detecting unit detecting an opening of the throttle valve, a detecting unit detecting an air amount passing through the intake pipe, a detecting unit detecting an output torque of the engine, an estimating unit estimating an air amount passing through the throttle valve on the basis of the opening of the throttle valve, an estimating unit estimating an air amount on the basis of the output torque, a correction unit adding time delay correction to the output data of the air amounts, and a failure judging circuitry comparing the three air amount provided by the respective unit, thereby making a judgement of a failure on any one of the detecting units.

Abstract: A stalling preventing appartus for an engine comprising intake air amount increasing means for increasing the amount of intake air to the engine from idling condition when the vehicle is in a start preparation condition, and rotation speed increase prevention means for preventing the engine speed from increasing due to the increase in intake air amount by the intake air amount increasing means, operation of the intake air amount increasing means and the rotation speed increase prevention means being stopped when the vehicle is in a start preparation condition, whereby a sufficient amount of air is supplied to the engine at starting of the vehicle and a delay in response of the air intake system to the pressing-down operation of the acceleration pedal is eliminated to increase the output torque of the engine at clutch-on and prevent engine stalling.

Abstract: A method and device for determining and controlling the condition of a spark ignition internal combustion engine involves detecting a physical value of combustion varying in association with combustion in the combustion chamber, then calculating the heat evolution rate from the physical value, and then determining the adjusting the combustion condition in dependence on the falling area of the heat evolution rate.

Abstract: A running control method and a running control system for a vehicle to control the engine output according to the effects of slope, wind, and change in vehicle weight, in which a reference traction force is determined as the sum of a mechanism friction, an acceleration force, and an air drag, the difference between an actually measured total traction force an the reference traction force is determined to obtain an environmental effect value. The environmental effect value represents an increase or decrease in traction force with respect to that in a flat, windless road for a standard vehicle weight. A throttle valve or a fuel injection control governer is feedback-controlled according to the environmental effect value, thereby improving the control response.

Abstract: The invention provides a device for detecting an air fuel ratio of an air fuel mixture supplied to the combustion apparatus of an internal combustion engine. The device comprises a sensor cell for developing an electric signal in response to the difference between the concentration of oxygen an exhaust gas and the concentration of oxygen in a reference gas, a controlling means for developing an electric control signal having a polarity determined from an output of the sensor cell, a pump cell for moving oxygen ions in response to an electric control signal received from the controlling means, a control current detecting means for detecting control current flow between the controlling means and the pump cell, an air fuel ratio detecting means for detecting the air fuel ratio from the control current flow, and a stoichiometric air fuel ratio detecting means for detecting the direction of the control current flow so as to determine the stoichiometric air fuel ratio.

Abstract: An air fuel ratio detecting device which is improved in accuracy as compared to similar prior art devices comprises a sensor cell for developing an electrical signal in response to the difference between the concentration of oxygen in the exhaust gas and the concentration of oxygen in a reference gas, a controlling means for developing an electrical control signal having a polarity determined from the output of the sensor cell, a pump cell for moving oxygen ions in response to the electrical control signal received from the controlling means, a control current detecting means for detecting control current flow between the controlling means and the pump cell, an air fuel ratio detecting means for detecting the air fuel ratio from the control current flow, a stoichiometric air fuel ratio detecting means for detecting the direction of the control current flow so as to determine the stoichiometric air fuel ratio, a storage means for storing therein a linear air fuel ratio value which is determined in a predetermi

Abstract: An intake port device comprises an intake port (9) formed by a straight part (13) and a helical part (15), and a valve (17) disposed adjacent to the inlet of the intake port. In order that intake air flow having a large swirl ratio can be supplied to an engine without being encountered with a large resistance even in a light-loaded condition of the engine, the valve (17) is held in its closed position without causing any sharp decrease in the coefficient of intake air flow when closed. In a modification of the intake port device, the valve (17) holds open the lower half of the intake port 9 in its closed position, so that intake air flow having a large swirl ratio can be supplied without being encounted with a large resistance even when the load of the engine is light. In another modification of the intake port device, the free end of the valve (17) is bent and deformed in the downstream direction of intake air so that the flow of intake air may not be encountered with a large resistance.

Abstract: An engine cooling apparatus separately cools a cylinder head and a cylinder block which are positioned around upper and lower portions of an engine combustion chamber. For increased engine output power, the engine cooling system cools the cylinder head to a relatively low temperature and the cylinder block to a relatively high temperature. The cylinder block includes cylinder liners disposed in an oil jacket which is supplied with oil from an oil circulating system via a pressure reducing valve. Oil in the oil jacket returns through a return path into an oil reservoir in the engine, and air bubbles in the oil jacket are returned to the oil reservoir via an air bubble return passage which develops a pressure difference between its opposite open ends.

Abstract: An engine cooling device comprises an oil jacket surrounding a cylinder portion of an engine, an oil gallery supplying high-pressure oil to various parts of the engine, and an oil pressure regulator disposed between the oil jacket and the oil gallery to reduce the pressure of the high-pressure oil supplied from the oil gallery and to supply the oil at a reduced pressure to the oil jacket. Thus, the required mechanical strength of the oil jacket can be decreased to decrease the weight of the engine cylinder block.

Abstract: A vehicle engine control device includes an operation-degree detecting device for detecting the degree of each operation of a manually operated member effected to control the output of the engine via a throttle valve actuator and a throttle valve; a target acceleration setting device for generating a target acceleration signal corresponding to the degree of the operation of the manually operated member; an acceleration detecting device for detecting each operative acceleration of the vehicle; and a control signal outputting device for comparing the target acceleration signal, which has been generated from the target acceleration setting device, with the detection results from the accelerating detecting device and then outputting a control signal to the actuator so as to control the degree to which the throttle valve is opened in such a way that the operative acceleration of the vehicle is controlled to the target acceleration.

Abstract: The present invention relates to a field of an internal combustion engine, and particularly to an engine control for controlling fuel supply and idling speed, etc. by using information of a throttle opening degree as information of load of the internal combustion engine. More particularly, the invention is directed to an engine control comprising calibrating a setting error of the throttle sensor as included in the throttle opening degree according to an output from an air flow sensor, and controlling the engine according to a calibrated throttle opening degree.

Abstract: An ignition timing control apparatus for an internal combustion engine capable of using as a fuel a regular (low-octane) gasoline, a premium (high-octane) gasoline, or a mixture of both type of gasolines. The engine produces knocks when the ignition timing is advanced beyond a reference ignition timing determined as a function of the type of gasoline being used. This advance ignition timing control apparatus detects the knocks, and provides as an output therefrom a signal according to the occurrence rate of the knocks which essentially indicates the type of gasoline in use. By means of this signal, this ignition timing control apparatus continuously displaces the reference ignition timing in the direction of retard angle by using a proportion factor calculator and an interpolator. At the same time, the displaced reference ignition timing is corrected by the detected knock signals on a real time basis. The combined ignition timing signal serves to energize an ignition coil to suppress the occurrence of knocks.

Abstract: A control apparatus for an internal combustion engine capable of using as a fuel a regular (low-octane) gasoline, a premium (high-octane) gasoline, or a mixture of both type of gasolines. The engine produces knocks when the ignition timing is advanced beyond a reference ignition timing determined as a function of the type of gasoline being used. This ignition timing control apparatus detects the knocks, and provides as an output therefrom a signal according to the occurrence rate of the knocks which essentially indicates the type of gasoline in use. By means of this signal, this ignition timing control apparatus continuously displaces the reference ignition timing in the direction of retard angle by using a proportion factor calculator and an interpolator. At the same time, the displaced reference ignition timing is corrected by the detected knock signals on a real time basis.

Abstract: An ignition timing control apparatus for an internal combustion engine capable of using as a fuel a regular (low-octane) gasoline, a premium (high-octane) gasoline, or a mixture of both type of gasolines. The engine produces knocks when the ignition timing is advanced beyond a reference ignition timing determined as a function of the type of gasoline being used. This ignition timing control apparatus detects the knocks, and provides as an output therefrom a signal according to the occurrence rate of the knocks which essentially indicates the type of gasoline in use. By means of this signal, this ignition timing control apparatus continuously displaces the reference ignition timing in the direction of retard angle by using a proportion factor calculator and an interpolator. At the same time, the displaced reference ignition timing is corrected by the detected knock signals on a real time basis. The combined ignition timing signal serves to energize an ignition coil to suppress the occurrence of knocks.

Abstract: A power transmission mechanism for automotive vehicles comprises a variable displacement engine which can be selectively shifted from the driving with all cylinders to the driving with a limited number of cylinders by changing the number of cylinders in operation. A torque transmission is interposed between an output shaft and a driven shaft of the engine which can selectively use either a fluid coupling or a direct coupling. A control unit selects the driving state of the variable displacement engine and a coupling of the torque transmission depending on the driving ranges of the variable displacement engine as well as the automotive vehicle.

Abstract: An engine idling speed controlling system including, for controlling the throttle valve opening appropriately, a first idling speed control means for comparing a detected signal provided from an engine speed sensor during idle running with a target engine idling speed and providing a first idling control signal, a correction value learning means for learning a long-time correction value or a just-previous correction value on the basis of a cumulative value or the newest value of a detected signal provided from a throttle position sensor during operation of the first idling speed control means, a second idling speed control means for comparing a detected signal provided from the throttle position sensor during idle running with a target throttle opening, receiving the long-time correction value and the just-previous correction value and producing a second idling control signal, and means for controlling the idle opening of the throttle valve in accordance with one of the first and second idling control signals

Abstract: Stabilization of the engine speed is effected rapidly particularly during idle running because there is provided a generator control means capable of suppressing or stopping power generation of a generator driven by an engine in the event the engine speed decreases below a predetermined value. Additionally, according to the present invention it is also possible to provide means capable of adjusting the amount of intake air fed to the engine combustion chamber, whereby in the event of decrease of the engine speed, for example, during idle running it is made possible to stabilize the engine speed rapidly and surely through control of generated energy for a short time and control of the amount of intake air for a long time. Furthermore, the present invention is applicable also to an operating cylinder number control type engine capable of bringing part of cylinders into a non-operative state.

Abstract: According to the method of the present invention for judging the state of operation of an intake passage pressure detecting device for an engine, first at the time of starting control the intake passage pressure detecting device is regarded as being in a state of failure, then an initial output from the intake passage pressure detecting device is stored, and in case the difference between this stored initial output and a subsequent output from the intake passage pressure detecting device exceeds a predetermined value, it is judged that the intake passage pressure detecting device is in a state of normal operation. Consequently, the state of operation of the above intake passage pressure detecting device can be judged with high reliability, and the reliability of the entire system can be improved to a large extent.

Abstract: A multiple cylinder engine of the type which is capable of controlling the number of operating cylinders to operate the engine in either in full or partial displacement mode, wherein the operation is switched smoothly between the full displacement and partial displacement in a simplified manner by detection of the pressure in the intake passage of the engine, putting the engine into full displacement mode by a control pressure when the engine is in cold state preferentially to the pressure in the intake passage, thereby shortening the time period of warming up to achieve smooth operation of the engine quickly.

Abstract: An engine idling speed controlling system including, for controlling the throttle valve opening appropriately, a first idling speed control means for comparing a detected signal provided from an engine speed sensor during idle running with a target engine idling speed and providing a first idling control signal, a correction value learning means for learning a long-time correction value or a just-previous correction value on the basis of a cumulative value of the newest value of a detected signal provided from a throttle position sensor during operation of the first idling speed control means, a second idling speed control means for comparing a detected signal provided from the throttle position sensor during idle running with a target throttle opening, receiving the long-time correction value and the just-previous correction value and producing a second idling control signal, and means for controlling the idle opening of the throttle valve in accordance with one of the first and second idling control signals