Apparatus and method for driving and controlling a stepping moto

Details Apparatus and method for driving and controlling a stepping moto Apparatus and method for driving and controlling a stepping moto

1994-07-07

1996-05-28

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02M 300

Patent

active

055201504

ABSTRACT:
An improvement to a controller of a step motor for a by-pass valve of an internal combustion engine is disclosed. After the engine is shut off, the valve is initialized to obtain accurate correspondence between the controller, the step motor, and the valve's position. The valve is first driven to a maximum open position. Thereafter, the valve is driven to a target position. In addition, a motor excitation pattern which the controller generates upon resetting is stored in a memory. According to one embodiment, the amount of motor rotation for reaching the target position is so determined that the last excitation pattern delivered to the motor matches the excitation pattern stored in the memory. According to another embodiment, a stopper is provided on the valve at the fully open position. After the engine is turned off, the motor is first energized to bring the valve against the stopper. Thereafter the motor is energized in the direction surpassing the fully open position. The amount of rotation of the motor is calculated so that the last excitation pattern sent to the motor matches that which was sent to the motor in bringing the valve against the stopper. The motor position is then initialized as the reference fully open position. Finally, the motor is energized to bring the valve to the target position.

REFERENCES:
patent: 4359983 (1982-11-01), Carlson et al.
patent: 4453515 (1984-06-01), Saji et al.
patent: 4469064 (1984-09-01), Manaka et al.
patent: 4488524 (1984-12-01), Sugiura et al.

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