Failure detecting apparatus
AssigneeJidosha Denki Kogyo Kabushiki Kaisha
InventorKeiichi Enomoto
Life of this patent
Estimating the term…
Abstract
The failure detecting apparatus includes an input circuit 13 connected to a temperature sensor 53 to detect various changes, for detecting the resistance of the temperature sensor 53, a monitor circuit 14 connected in parallel to the input circuit 13 for monitoring the failure of the input circuit 13, and a CPU 1 which is supplied with the resistance of the temperature sensor 53 detected by the input circuit 13 and in detecting failure of the monitor circuit 14, switches its state between the inputting state receiving a signal from the monitor circuit 14 and the outputting state sending the signal to the monitor circuit 14.
Claims3
A failure detecting apparatus comprising:
- an input circuit connected to a detecting resistor to detect various changes, for detecting the resistance of the detecting resistor,
- a monitor circuit connected in parallel to the input circuit for monitoring the failure of the input circuit, and
- a control member which is supplied with the resistance of the detecting resistor detected by the input circuit and in detecting failure of the monitor circuit, switches its state between the inputting state receiving a signal from the monitor circuit and the outputting state sending the signal to the monitor circuit, wherein
- in detecting the failure of the monitor circuit, the control member switches the monitor circuit from the inputting state to the outputting state and determines that the monitor circuit is out of order if a difference between the A/D converted value of the input circuit before the monitor circuit is switched from the inputting state to the outputting state and the A/D converted value of the input circuit after the monitor circuit after the monitor circuit has been switched from the inputting state to the outputting state is not within a predetermined range.
Dependencies are inferred from the claim text.