摘要:
The leakage resistance detection device includes a coupling capacitor having one terminal connected to an on-board high voltage device and another terminal connected to a repetitive signal output circuit, and measures a leakage resistance as a function of a transition time during which a monitoring voltage, which is a potential at the another terminal of the coupling capacitor to be charged/discharged in response to an operation of a charge/discharge switching element that operates in response to a repetitive pulse signal, changes from one predetermined voltage to reach another predetermined voltage. When the measured leakage resistance has become equal to or smaller than a predetermined limit leakage resistance, the leakage resistance detection device generates a resistance abnormality determination output.
摘要:
In a vehicle-mounted electronic control device having a switching power supply in which a switching element is controlled to obtain a predetermined intermediate voltage Va stepped down from a vehicle-mounted battery, and to which a downstream side coil, a flywheel diode, and an output capacitor are connected to suppress a pulsating voltage, a circuit for suppressing reverse conduction for the switching element is provided in order to prevent that the switching element is reversely conducted and thus a charging voltage of the output capacitor is abnormally lowered when a power supply voltage Vb of the vehicle-mounted battery is abnormally lowered.
摘要:
A fourth constant-voltage power circuit directly powered from an on-vehicle battery is connected, in parallel through a serial resistor, to a second constant-voltage power circuit powered from the on-vehicle battery through an output contact of a power relay, and is connected to a drive power terminal of a microprocessor. When the output contact is closed, the microprocessor operates with an output voltage of the second constant-voltage power circuit, and an output current of the fourth constant-voltage power circuit is limited to less than or equal to a predetermined value by the serial resistor. During the operation stop at which a power switch is open, a micro standby current is supplied from the fourth constant-voltage power circuit to the microprocessor.
摘要:
A calculation control circuit unit 110A is provided with a microprocessor 111, an auxiliary control circuit unit 190A, and a high-speed A/D converter 115 to which the detection signals of excitation currents for electromagnetic coils 81 through 84 are inputted; based on an valve-opening command signal generated by the microprocessor 111 and excitation-current setting information, the auxiliary control circuit unit 190A opening/closing-controls power supply control opening/closing devices by use of a numeral value comparator and a dedicated circuit unit, and monitors and stores at least one of the peak value of a rapid excitation current and a peak current reaching time; the microprocessor 111 performs correction control with reference to the monitoring storage data, and implements fuel injection control while reducing a rapid control load on the microprocessor 111.