Abstract: Even when, due to an abnormal decrease in the battery voltage, an engine control apparatus is inoperative, an engine can safely be started. Based on gearshift lever selection position information generated by a gearshift sensor (109A), a first detection circuit (194) generates a first detection signal PS1 when the gearshift lever is in the neutral position or in the parking position; a microprocessor (110A) is provided with a second detection means that generated a second detection signal PS2 when the gearshift lever is in the neutral position or in the parking position. Even when, due to an abnormal decrease in the voltage of a vehicle battery, the microprocessor (110A) is inoperative, by ascertaining through the first detection signal PS1 that the vehicle is in a state of not being driven, the engine can be started by means of a starting switch.

Abstract: The on-vehicle electronic control device includes a main power supply circuit fed with power from an on-vehicle battery through an output contact of a power supply relay and a main power supply terminal of a connector to supply a stabilized control voltage to a microprocessor. When contact failure occurs in the main power supply terminal, the main power supply circuit is fed with bypass power from the output contact through a first electrical load and a commutation diode to perform the one of the report of the abnormality and the storage of the abnormality occurrence history information. A bypass power fed state is detected when an input voltage to the main power supply circuit is lower than a power supply voltage of the on-vehicle battery.

Abstract: Even when, due to an abnormal decrease in the battery voltage, an engine control apparatus is inoperative, an engine can safely be started. Based on gearshift lever selection position information generated by a gearshift sensor (109A), a first detection circuit (194) generates a first detection signal PS1 when the gearshift lever is in the neutral position or in the parking position; a microprocessor (110A) is provided with a second detection means that generated a second detection signal PS2 when the gearshift lever is in the neutral position or in the parking position. Even when, due to an abnormal decrease in the voltage of a vehicle battery, the microprocessor (110A) is inoperative, by ascertaining through the first detection signal PS1 that the vehicle is in a state of not being driven, the engine can be started by means of a starting switch.

Abstract: The on-vehicle electronic control device includes a main power supply circuit fed with power from an on-vehicle battery through an output contact of a power supply relay and a main power supply terminal of a connector to supply a stabilized control voltage to a microprocessor. When contact failure occurs in the main power supply terminal, the main power supply circuit is fed with bypass power from the output contact through a first electrical load and a commutation diode to perform the one of the report of the abnormality and the storage of the abnormality occurrence history information. A bypass power fed state is detected when an input voltage to the main power supply circuit is lower than a power supply voltage of the on-vehicle battery.

Abstract: This invention provides an electronic control unit is capable of suppressing electromagnetic noise having a frequency band used in a portable wireless apparatus, and capable of exhibiting a noise resistance property against electromagnetic noise. The electronic control unit including a constant voltage power supply circuit portion, an analog signal inputting circuit portion, and a conversion processing circuit portion, an analog sensor and a driving power supply being connected to the outside, and the unit being connected to the analog sensor through a power supply line and a signal line, in which the analog signal inputting circuit portion includes a current limiting circuit portion, an integrating circuit portion, a current limiting resistor, a signal noise absorbing circuit, and a first bypass capacitor, and capacitance (C1) and parasitic inductance (L1) of the first bypass capacitor are set in a range of 7×106<1/[2??(L1×C1)]<35×106.

Abstract: This invention provides an electronic control unit is capable of suppressing electromagnetic noise having a frequency band used in a portable wireless apparatus, and capable of exhibiting a noise resistance property against electromagnetic noise. The electronic control unit including a constant voltage power supply circuit portion, an analog signal inputting circuit portion, and a conversion processing circuit portion, an analog sensor and a driving power supply being connected to the outside, and the unit being connected to the analog sensor through a power supply line and a signal line, in which the analog signal inputting circuit portion includes a current limiting circuit portion, an integrating circuit portion, a current limiting resistor, a signal noise absorbing circuit, and a first bypass capacitor, and capacitance (C1) and parasitic inductance (L1) of the first bypass capacitor are set in a range of 7×106<1/[2??(L1×C1)]<35×106.

Abstract: The invention provides a deterioration detector for an exhaust gas sensor capable of detecting an amount of change with age of an internal resistance and conducting deterioration judgment taking into consideration fluctuation between products and temperature dependency of the internal resistance of the exhaust gas sensor.

Abstract: The invention provides a deterioration detector for an exhaust gas sensor capable of detecting an amount of change with age of an internal resistance and conducting deterioration judgment taking into consideration fluctuation between products and temperature dependency of the internal resistance of the exhaust gas sensor.