摘要:
An engine control system comprising a variable valve actuating mechanism for an engine which may consists of a mechanism capable of varying valve timing, a variable capacity supercharger which may consists of a turbocharger provided with moveable vanes for varying a cross sectional area of an exhaust gas passage leading to a turbine wheel, and a control unit for controlling a valve actuating operation of the valve actuating mechanism and a capacity varying operation of the variable capacity supercharger. The capacity of the supercharger is controlled by taking into account the operating conditions of the valve actuating mechanism. Thus, the control unit is capable of achieving a precise and prompt control action, and, by appropriately determining the control plan, it is possible to increase the maximum output of the engine and/or to reduce strain on the engine.
摘要:
A method of controlling supercharging pressure in an internal combustion engine, wherein the supercharging pressure is controlled by controlling a control amount for operating a supercharging pressure control device. The control amount is controlled in feedback control mode responsive to the difference between the actual value of the supercharging pressure and a desired value thereof when the supercharging pressure is in a steady state, and at the same time a learned value of the correction value is obtained by calculating values of same applied during the feedback control. The control amount is controlled in open loop control mode based upon the learned value when the supercharging pressure is in a transient state. The calculation of the learned value is inhibited when a predetermined condition is satisfied during the steady state. The predetermined condition is satisfied when the desired value of the supercharging pressure is set to a different value than a normal value set during the steady state.
摘要:
A method of controlling supercharging pressure in an internal combustion engine by means of a basic control amount dependent upon operating conditions of the engine. A change rate of the supercharging pressure is detected. When the supercharging pressure is in a transient state where it is increasing, the basic control means is corrected in response to the detected change rate of the supercharging pressure, in such a manner that the supercharging pressure increases at a predetermined rate.
摘要:
A method of controlling supercharging pressure in an internal combustion engine having a supercharger with an increase rate-varying device for varying the rate of increase of the supercharging pressure. The supercharging pressure is controlled to a desired value in response to the difference between the actual value of the supercharging pressure and the desired value. The increase rate-varying device is held in a position for obtaining the maximum rate of increase of the supercharging pressure while the actual value of the supercharging pressure is below a predetermined value which is lower than the desired value. The predetermined value is set to a lower value as the rate of increase of the supercharging pressure increases, or when a transmission of the engine is in a lower of two or more speed positions of the transmission. Also, the predetermined value of the supercharging pressure is set to a lower value as the actual intake air temperature decreases.
摘要:
In an exhaust system of the internal combustion engine, there are provided, in this order from upstream, a three-way catalyst, an adsorbent-catalyst containing at least zeolite in its composition and capable of absorbing hydrocarbons, an electrically heated catalyst containing at least platinum in its composition, and a catalyst containing at least palladium in its composition. The electrically heated catalyst can effectively purify low boiling-point HC of paraffinic hydrocarbon which has been desorbed from the adsorbent-catalyst after about 20 seconds from the start of the engine. On the other hand, the catalyst can effectively purify high boiling-point HC of aromatic hydrocarbon which has been desorbed from the adsorbent-catalyst after about 80 seconds from the start of the engine. When the catalyst is an electrically heated catalyst, it is energized after the energization of the other electrically heated catalyst is ended and the supply of electric power can hence be minimized.
摘要:
A valve operating control device for an internal combustion engine having a valve operating mode changing mechanism for switching the opening/closing operation of an intake or exhaust valve between a low-speed operation mode corresponding to a low-speed operation of the engine and a high-speed operation mode corresponding to a high-speed operation of the engine. A control device controls the operation of the valve operation mode changing mechanism according to the rotational speed of the engine for shifting the valve operation mode changing mechanism from the high-speed mode to the low-speed mode where the output torque of the engine is the same in the low- and high-speed operation modes of the valve operation mode changing mechanism and for shifting the valve operation mode changing mechanism from the low-speed operation mode to the high-speed operation mode at a second rotational speed that is higher than the first rotational speed.
摘要:
A method of controlling the quantity of supplementary air being supplied to an internal combustion engine having first and second control valves arranged, respectively, in first and second auxiliary air passages bypassing the throttle valve for on-off control of the opening areas of the respective auxiliary air passages. When the engine is operating in a particular operating condition, the first and second control valves are selectively actuated in response to the detected value of atmospheric pressure encompassing the engine in such a manner that the sum of the opening areas of the first and second auxiliary air passages increases as the detected value of the atmospheric pressure decreases. The engine is determined to be operating in the particular operating condition when it is in a cranking condition, when a predetermined period of time has not yet elapsed after the engine has got out of a cranking condition, or when the engine is in a warming-up condition. Preferably, the engine includes a third control valve arranged in a third auxiliary air passage bypassing the throttle valve, and adapted to increase the opening area of the third auxiliary air passage with a decrease in the engine temperature for controlling the supplementary air quantity to be supplied to the engine through the third auxiliary air passage to an appropriate value when the engine is operating in a warming-up condition at a predetermined reference atmospheric pressure.
摘要:
An air-fuel ratio feedback control system for use with an internal combustion engine, which is adapted to control the air-fuel ratio of a mixture being supplied to the engine, by the use of a first coefficient variable in response to the output of an exhaust gas concentration sensor arranged in the exhaust system of the engine when the engine is operating in an operating condition other than particular operating conditions, and by the use of a second coefficient which is a mean value of values of the first coefficient obtained during the above operating condition other than the particular operating conditions when the engine is operating in one of the particular operating conditions, for replacing the first coefficient with the second coefficient. Storage means is provided for storing and holding the value of the second coefficient even when the engine is inoperative.
摘要:
An idling speed control method which is adapted to detect by detecting means predetermined rotational angle positions of an internal combustion engine having supplementary air supply control means that regulates the quantity of supplementary air being supplied to the engine, and to control the ratio of operating duty of the supplementary air supply control means to an interval of time at which pulses of a signal indicative of the predetermined rotational angle positions are generated, in a feedback manner responsive to the difference between actual idling engine speed and desired idling speed. When an abnormality is detected in the detecting means, which includes a sensor for sensing the predetermined crank angle positions, a maximum quantity of supplementary air is supplied to the engine by operating the supplementary air quantity control means to its operating limit. The supplementary air supply control means may comprise either (1) a solenoid valve disposed in a supplementary air passage, one end of which communicates with an intake passage of the engine at a location downstream of a throttle valve arranged in the intake passage and the other end communicates with the atmosphere, or (2) a negative pressure-operated means disposed for operating the throttle valve to open or close in response to negative pressure in the intake passage at a zone downstream of the throttle valve, and a negative pressure control means for controlling the magnitude of negative pressure in the intake passage acting upon the negative pressure-operated means.
摘要:
An idling rpm feedback control method for controlling the quantity of supplementary air being supplied to an internal combustion engine, in a feedback manner, responsive to the difference between actual engine rpm and the desired idling rpm. When the engine rpm drops to a predetermined rpm being the upper limit of the desired idling rpm, the above feedback control is initiated. When the engine is decelerated with the throttle valve fully closed, and before the feedback control is started, the supplementary air quantity is controlled in decelerating mode in a predetermined manner while the engine speed drops from a predetermined rpm larger than the upper limit of the desired idling rpm to the same upper limit. In case deceleration is continued without disengagement of the power transmission means of the engine, even if the engine rpm drops below the above upper limit of the desired idling rpm, deceleration mode control of the quantity of supplementary air is continued until the power transmission means is disengaged.