Document Type and Number:
Japanese Patent JPH0156257
Kind Code:
B2
Abstract:
PURPOSE:To prevent fluctuation of torque of an engine designed to be capable of changing the number of cylinders to be operated, by raising the idling speed to the target idling speed at the time of decreasing the number of cylinders to be operated, and then decreasing the number of operated cylinders at the time of decreasing the number of cylinders to be operated. CONSTITUTION:In an engine 1 which is designed to be capable of changing the number of cylinders to be operated and has a cylinder selector 8 for controlling operation of intake and exhaust valves, a throttle valve 12 and a by-pass valve 16 are provided in an intake passage 2, and operation of these valves is controlled by a control circuit 20. The control circuit 20 is furnished with output signals of various sensors 21-23 for detecting the operational conditions of the engine. When a signal for requring to decrease the number of cylinders to be operated in produced, the control circuit 20 at first opens the by-pass valve 16 and raises the engine speed to the target idling speed at the time of cylinder- reduced operation of the engine. Then, the number of operated cylinders is decreased by sending a signal to the clyinder selector 8.
Inventors:
ARIMA MANABU
Application Number:
JP13629283A
Publication Date:
November 29, 1989
Filing Date:
July 25, 1983
Export Citation:
Assignee:
MAZDA MOTOR
International Classes:
F02D41/02; F02D13/06; F02D17/02; F02D21/08; F02D31/00; F02D41/00; F02D41/36; F02M23/04
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