Japanese Patent JPH037020

B2

A stepping motor is driven such that a rotational speed of an engine falls within a range of a target rotational speed determined in accordance with at least an engine coolant temperature when a throttle valve is substantially fully closed, in order to control an opening area of an air flow rate control valve. In the control operation, a lower limit of the opening area of the control valve is set to prevent the opening area from being reduced beyond a predetermined area in order to prevent engine stall. A predetermined setting is stored in a predetermined area each time when a vehicle speed signal from a vehicle speed sensor is received and the predetermined setting is decremented under a predetermined condition. When the decremented setting reaches zero, a current lower limit is maintained.

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KOBAYASHI NOBUYUKI
ITO HIROSHI
KOBASHI MAMORU

JP12688881A

January 31, 1991

August 13, 1981

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TOYOTA MOTOR CO LTD

F02D41/16; F02D31/00; F02D41/08; F02D41/22

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