Engine throttle valve control device

Details Engine throttle valve control device Engine throttle valve control device

1987-06-08

1988-08-02

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

123361, F02D 908, F02D 4102

Patent

active

047608269

ABSTRACT:
Engine throttle valve control device having a step motor to operate a throttle valve which comprises detecting means for detecting the need for changing the rotational direction of the step motor, and delaying means which delays the supply of the drive signal to the step motor for a predetermined period when the need for changing the rotational direction of the step motor is detected by the detecting means. In the present invention, when it is necessary to change the rotational direction of the step motor, the step motor is not immediately driven to reverse the rotational direction but is halted for a predetermined short time. After the short time passes the step motor is driven to rotate in the opposite direction. According to the present invention, the inertial force acting on the step motor when it changes its rotational direction can be avoided or decreased. Hence, loss of control of the step motor due to the inertial force is avoided, and accurate control of the throttle valve opening is performed.

REFERENCES:
patent: 4161994 (1979-07-01), Collonia
patent: 4475503 (1984-10-01), Nakamura et al.
patent: 4508078 (1985-04-01), Takeuchi et al.
patent: 4538579 (1985-09-01), Moriya et al.
patent: 4592322 (1986-06-01), Murakami et al.

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