Throttle valve control system for engine

Details Throttle valve control system for engine Throttle valve control system for engine

1993-09-09

1995-09-05

Kamen, Noah P.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

731181, 74513, F02D 900

Patent

active

054471346

ABSTRACT:
In a throttle valve control system, an accelerator pedal position sensor (APS) comprises a first APS for detecting a large amount of movement of an accelerator pedal which is relatively low in resolution and a second APS for detecting middle and small amounts of movement of the accelerator pedal which is relatively high in resolution, and a throttle valve controlling ECU has abnormal condition detector which determines that at lease one of the first and second APSs is in abnormal condition when the relationship between the output voltages of the first and second sensors is different from that which is established when the first and second APSs are in normal condition. Therefore, even when the accelerator pedal is moved slightly which has been positioned to open the throttle valve to a low or middle degree, the throttle valve is controlled, which improves the operability of the engine. The abnormal condition detector detects when at least one of the first and second APSs is out of order, so that the difficulty is eliminated that it becomes impossible to control the throttle valve when the accelerator pedal position sensor is out of order; that is, the vehicle is improved in safety.

REFERENCES:
patent: 4768483 (1988-09-01), Asayama
patent: 5216916 (1993-06-01), Bederna et al.

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