Patent ID: 9120431
Filing Date: 2015-09-01
Classification: B60K,B60R

Abstract:
1. An in-vehicle electronic control unit fed via an output contact in a power supply relay that is energized by an in-vehicle battery when a power supply switch for vehicle operation is closed, comprising: a microprocessor that drives an electrical load group including at least fuel injection solenoid valves under control in response to an operation state of an in-vehicle sensor group; and a program memory that operates in cooperation with the microprocessor and pre-stores a control program comprising a decompression processing portion including a cut-off timer in addition to a control program comprising an input and output control portion for vehicle operation, wherein: the power supply relay is energized by the in-vehicle battery via an energizing transistor during a vehicle stop state in which the power supply switch is not closed when at least one of a filler lid open command switch and a filler lid opening detection switch is closed, and the power supply relay is operated under timed energization so as not to energize the power supply relay when the filler lid opening detection switch remains in a closed state over a predetermined limit period while operated under self-hold energization by a self-hold command output generated by the microprocessor when directly energized and the microprocessor starts to operate; an initial state corresponding to the limit period is restored and the power supply relay is operated again under timed energization when the filler lid open command switch is closed again after being opened, even after the limit period is expired when the filler lid open command switch is closed; the filler lid opening detection switch operates in response to closing and opening states of a filler lid provided on an outer surface of a filler cap section of a fuel pipe which is connected to a fuel tank and is closed when the filler cap is in a manually openable and closable state as the filler lid is brought into one of a fully opened state, a half opened state, and a closing and locking cancelled state by one of driving of a filler opening actuator and a manual operation; the decompression processing portion discharges an internal pressure of the fuel tank to atmosphere via a canister adsorbing evaporated fuel by energizing and opening a sealing valve opening solenoid valve provided between the fuel tank and the canister at least once when one of the filler lid open command switch and the filler lid opening detection switch is closed, and when the filler opening actuator is provided, drives the filler opening actuator to open the filler lid after one of an elapse of a predetermined time since the filler lid opening detection switch is closed and a detection of an internal pressure drop of the fuel tank within a predetermined threshold range in a vicinity of atmospheric pressure; the decompression processing portion performs one of an action to stop the self-hold command output because the filler cap and the filler lid are closed upon completion of refueling and the sealing valve opening solenoid valve is de-energized and closed and an action to de-energize and seal the sealing valve opening solenoid valve because the self-hold command output stops; and the cut-off timer stops the self-hold command output when the filler lid is not closed even after an elapse of a predetermined cut-off threshold time since one of the filler lid open command switch and the filler lid opening detection switch is closed.