Abstract: A lid of a fuel tank that includes a lid body constructed of a molded plastic and shaped and sized to be put in an opening formed in a wall of the fuel tank. The lid body has a first portion that is exposed to the interior of the fuel tank when the lid is put in the opening of the wall and a second portion that is projected laterally from a major portion of the lid body over a peripheral area of the opening of the wall when the lid is put in the opening of the wall. The lid further includes a wiring embedded and extending in the lid body. The wiring has a first end exposed to the outside of the lid body from the first portion of the lid body and a second end exposed to the outside of the lid body from the second portion of the lid body.

Abstract: In a fuel vapor purge system, a blocked diagnosis zone is pressurized by an air pump, a pressure in the diagnosis zone at the time when the diagnosis zone is pressurized, and an occurrence of leakage in the diagnosis zone is judged based on the comparison between a curvature of a change curve of the pressure and a threshold.

Abstract: An engine control unit that controls an engine and a fuel supply control unit that controls a fuel supply apparatus are disposed separately, and the antitheft process is performed individually by the respective control units.

Abstract: When a pressure of fuel supplied to an engine is higher than a target, the fuel is carried in a reverse direction by rotating a fuel pump in reverse, and in accordance therewith, the fuel pressure is made to fall with good responsiveness.

Abstract: When an operation of internal combustion engine is stopped, the power consumption of a control unit is lowered, to measure an elapsed time. When the elapsed time reaches a standby time, the processing of lowering the power consumption is cancelled, to diagnose whether or not the leakage occurs in an evaporation purge line of a fuel vapor processing apparatus.

Abstract: A check valve disposed between an air pump and a section to be pressurized, is held in a closed state when the section is pressurized by said air pump, and is operated to open when the electric power is supplied to an electromagnetic solenoid. In an abnormally pressurized state, the power supply to the electromagnetic solenoid is shut off, to forcibly close the check valve.

Abstract: An air pump is driven under a condition where a check valve is not opened, and an occurrence of failure in the check valve and the air pump is diagnosed based on a driving load of the air pump or a pressure upstream of the check valve or a pressure downstream of the check valve at the time.

Abstract: In a fuel vapor purge system, a diagnosis section inclusive of a fuel tank is pressurized from the generation of fuel vapor in the fuel tank has been finished after an operation of an engine was stopped, and the diagnosis is performed based on a pressure in the diagnosis section.

Abstract: When a vehicle state is detected during an engine is stopped, a sampling cycle of a detection signal indicating the vehicle state and a clock frequency of a CPU are changed, according to a change speed of the detection signal or an elapsed time after the engine is stopped.

Abstract: A motor and a pump in an air pump pressurizing a fuel vapor passage of a fuel vapor purge system, are disposed in a case which is partitioned into a chamber accommodating the motor and a chamber accommodating the pump, to transmit a driving force of the motor to the pump by a magnetic coupling.

Abstract: A device according to the present invention is provided with element temperature measurement voltage application circuit for temporarily applying a predetermined voltage for element temperature measurement to a sensor element of an air-fuel ratio sensor equipped to an exhaust system of an internal combustion engine, first sensor output reading circuit for reading in a sensor output just before applied with the voltage, and second sensor output reading circuit for reading in a sensor output being applied with the voltage, wherein the element temperature of the air-fuel ratio sensor is estimated based on the sensor output just before applied with the voltage and the sensor output being applied with the voltage. Further, during internal resistance measurement of the sensor element of the air-fuel ratio sensor equipped to the exhaust system of the internal combustion engine, a voltage applied to the heater for heating the sensor element is maintained to be constant.

Abstract: A lid of a fuel tank comprises a lid body constructed of a molded plastic and shaped and sized to be put in an opening formed in a wall of the fuel tank. The lid body has a first portion that is exposed to an outside of the fuel tank when the lid is put in the opening of the wall and a second portion that is exposed to an interior of the fuel tank when the lid is put in the opening of the wall. At least one of the first and second portions has a flat surface for mounting thereon external parts. The lid further comprises a through passage that extends in and through the lid body between the first and second portions. The through passage includes a first passage part terminating at the first portion, a second passage part terminating at the second portion, and a third passage part extending between the first and second passage parts to connect the same. The first and second passage parts are offset in a direction parallel with the flat surface.

Abstract: A lid of a fuel tank comprises a lid body constructed of a molded plastic and shaped and sized to be put in an opening formed in a wall of the fuel tank. The lid body has a first portion that is exposed to the interior of the fuel tank when the lid is put in the opening of the wall and a second portion that is projected laterally from a major portion of the lid body over a peripheral area of the opening of the wall when the lid is put in the opening of the wall. The lid further comprises a wiring embedded and extending in the lid body. The wiring has a first end exposed to the outside of the lid body from the first portion of the lid body and a second end exposed to the outside of the lid body from the second portion of the lid body.

Abstract: Detection signals from an airflow meter, which outputs different detection signals for the forward flow and reverse flow of the intake air of an engine, are converted into intake air amount data of the same sign. An offset amount is subtracted from the intake air amount data obtained by the conversion process, thereby obtaining intake air amount data in which the forward flow and the reverse flow are distinguished from each other by positive and negative signs.

Abstract: In a fuel vapor purge system, an occurrence of leakage in a diagnosis zone is diagnosed, based on data indicating a pressure rise characteristic in the diagnosis zone for when the diagnosis zone is pressurized, and data indicating a pressure drop characteristic in the diagnosis zone after the pressurization of the diagnosis zone is stopped.

Abstract: In a diagnosis control for periodically detecting a pressure in a fuel tank during an operation of an engine is stopped, to diagnose whether or not the leakage occurs in a fuel vapor purge system, the power supply to a sensor detecting the pressure in the fuel tank is intermittently performed at each detection period.

Abstract: An engine control unit executes the fail-safe process for stopping an operation of a fuel pump based on a detection signal from an airbag sensor unit, and a fuel system control unit detects the vehicle collision based on a fuel level or a pressure in a fuel tank, to execute independently the fail-safe process for stopping the operation of the fuel pump.

Abstract: When a pressure of fuel supplied to an engine is higher than a target, the fuel is carried in a reverse direction by rotating a fuel pump in reverse, and in accordance therewith, the fuel pressure is made to fall with good responsiveness.

Abstract: When a fuel pressure on the downstream side of a fuel pump for an internal combustion engine is less than a slice level, it is judged whether or not an applied voltage on a motor unit and/or the power consumption in the motor unit are normal. In the case where the motor unit is not failed, it is estimated that the pump unit is failed.

Abstract: When an operation of internal combustion engine is stopped, the power consumption of a control unit is lowered, to measure an elapsed time. When the elapsed time reaches a standby time, the processing of lowering the power consumption is cancelled, to diagnose whether or not the leakage occurs in an evaporation purge line of a fuel vapor processing apparatus.