| 摘要 |
PURPOSE:To assure good level for the exhaust gas and to eliminate necessity for use of any EGR device by controlling the amounts of intake and exhaust gases for each cylinder using a control unit on the basis of the opening/closing timing and period of the exhaust and suction valves. CONSTITUTION:A control computer 11 performs operation for the opening/closing timing and period of the suction valve 6 from the data such as intake temperature, atmospheric pressure, water temperature, angle of acceleration and angle of crank and, thereby, control the amounts of mixture gas to fill the cylinders. Accordingly, the pressure in the suction pipe 3 does not change to a large extent and the flowin air amount does not present the vibratory transent phenomenon, so that the specified air-to-fuel ratio can be well obtained. At the time of deceleration, shutting of the suction valve 6 will elminate risk of imperfect combustion, so that there is no need for equipment with a mechanism to shut the throttle valve slowly or a one to allow the additional air to flow in. Further, control of the amount of exhaust gas out of the cylinders on the basis of the calculated opening/closing timing and period of the exhaust valve 7 ensures that the exhaust gas circulation takes place directly in the cylinders by opening/closing timings of the two valves 6, 7. Thus any EGR device is not required to install any more. |
