摘要:
Normally, an air-fuel ratio is controlled in accordance with the engine speed and the intake air quantity of an internal combustion engine with a turbocharger. When the output pressure of the turbocharger increases excessively, an intake relief valve opens to decrease the intake air quantity. In this case, the fuel injection quantity is controlled solely in accordance with the engine speed.
摘要:
In order to mathematically detect the gear position of a vehicle transmission system, engine speed and vehicle speed are detected. A first reference level defined by a predetermined ratio of engine speed and vehicle speed is established for determining the gear position by a mathematical operation involving the sensed engine speed and the sensed vehicle speed and the reference level. The first reference level is shifted to a second reference level in accordance with the determined gear position, thereby preventing an erroneous determination of the gear position.
摘要:
A method and apparatus for controlling ignition system spark timing. Engine temperature is sensed and a basic value of spark advance is determined by calculation based upon the engine operating parameters excluding the engine temperature. This basic value of spark advance is corrected by a central processor in accordance with the sensed engine temperature.
摘要:
An intake air flow rate control method system for an internal combustion engine includes a valve which is provided with an electromagnetically operated actuator responsive to a control signal. The control system identifies a control signal for controlling actuation of the actuator and thereby for controlling the air flow rate generating the control signal indicative of the control. The display selectively carries out closed loop (feedback) control and open loop control corresponding to engine driving conditions. Feedback control is carried out when the engine driving condition is stable (in steady state). To determine a suitable condition control for closed loop, a throttle valve closed position, a transmission neutral, and a vehicle speed are checked. When the throttle valve is closed and the transmission is in neutral, the vehicle speed is less than 8 km/h and/or the fuel supply occurs shut off, a decision to carry out feedback (closed loop) control is made. Thus, according to the present method and system, control of the air flow rate can be effectively and successfully switched corresponding to engine driving condition.
摘要:
An intake air flow rate control method and system comprises a circuit for determining a basic control ratio corresponding to an engine or engine coolant temperature and a plurality of circuits for correcting the basic control ratio corresponding to engine driving conditions and engine load conditions. Additionally, the system discriminates among engine driving condition to determine whether feedback control or open loop control is to be carried out. A circuit for discriminating among the engine driving conditions improves response characteristic to reduce lag that tends to occur between feedback control and open loop control when control operation is switched between feedback control and open loop control.
摘要:
A method and apparatus for controlling ignition system spark timing where exhaust gas recirculation is employed. The value of spark advance is determined based upon engine operating parameters and exhaust gas recirculation rate is sensed. Correction means is provided which corrects the value of spark advance in accordance with the sensed value or actual valve of exhaust gas recirculation rate.
摘要:
The air-fuel ratio of the air-fuel mixture supplied to the combustion chambers of an internal combustion engine is regulated at a required value by controlling the air amount inducted through an additional air passage into the main well which communicates with the main discharge nozzle of a carburetor. The air amount control is accomplished by valve means which is arranged to open and close in on-and-off manner the additional air passage. An air induction passage is further formed to communicate the additional air passage downstream of the valve means with the atmosphere to introduce further air when the valve means closes the additional air passage and vacuum still remains therewithin.
摘要:
This invention relates to a variable cam engine of which each cylinder has at least one valve driven by multiplicity of cams which give different engine torque outputs. This invention provides an engine comprising a decision-making device which decides change-over of the cams along with a selection of a target cam according to the engine running conditions, a cam change-over mechanism which disengages a current cam from the valve and engages said target cam instead, a crank shaft angle sensor, a sequential control device which, when the cam change-over is made at an engine speed below a predetermined speed, actuates the cam change-over mechanism at predetermined intervals starting form a specific cylinder and proceeding in turn through the other cylinders, and a regulating device which regulates the combustion in each cylinder corresponding to the cam change-over. The fuel supply quantity and ignition period are thereby regulated according to the cam change-over for each cylinder, a torque step due to the cam change-over is prevented, and the cam change-over takes place smoothly.
摘要:
In a method of supplying fuel to an internal combustion engine during start-up, the occurence of combustion is detected to arrest the change of the fuel supply quantity until steady-state engine operation is achieved. Combustion is detected by comparing sensed engine speed to a minimum engine speed resulting from combustion in the cylinders. Additionally, control values used to derive the start-up fuel quantity are modified so that the fuel quantity increases monotonically from a relatively low initial value until fuel ignition is detected.
摘要:
Disclosed is an electronic automatic control method and system for controlling an air flow rate for an internal combustion engine of an automotive vehicle. The system includes an open loop control and a feedback control which are selectively effected corresponding to engine condition. The system includes an engine or temperature range within which the system controls engine speed. The given temperature range corresponds to a normal ambient temperature range so as to improve warming up efficiency upon starting engine under cold engine conditions. The system further includes a means for determining a feedback control condition to effect feedback control at a specific engine condition. In the feedback condition, the variable rate of a control duty cycle pulse which is applied to an electrically operative air flow rate adjusting means, is determined corresponding to an actual engine speed and a difference between the actual engine speed and a reference engine speed determined corresponding to the engine or coolant temperature.