Engine idling rotational speed control device

Details Engine idling rotational speed control device Engine idling rotational speed control device

1982-08-11

1985-04-30

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02D 902, F02D 3100

Patent

active

045137102

ABSTRACT:
An intake air flow rate control device comprises a bypass passage for bypassing a throttle valve arranged in an intake manifold, flow control valve arranged in the bypass passage and stepping motor for driving the flow control valve. When the throttle valve is substantially fully closed, the stepping motor is driven to control an opening area of the flow control valve so that an engine rotational speed is within a range of a target rotational speed for at least an engine coolant temperature. In the above-described control, a lower limit of a stepping position of the stepping motor is set to prevent the opening area from being reduced beyond a predetermined area in order to prevent engine stall.

REFERENCES:
patent: 4344399 (1982-08-01), Matsumura et al.
patent: 4392468 (1983-07-01), Kobashi et al.

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