Electronic control unit for car
AssigneesHarness System Technologies Research, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
InventorYoshitaka Sumida
Life of this patent
Estimating the term…
Abstract
An electronic control unit for a car in which a control portion operates in accordance with signals given from a plurality of input portions including a car ignition switch to thereby perform drive control of a predetermined output portion, the control portion having a sleep function by which the control portion stops when the control portion in not required to operate, comprises a watchdog circuit for watching the operation of the control portion; and a conditioning circuit for defining a condition for starting the watchdog circuit; the conditioning circuit being constituted by an OR circuit for performing the logical sum OR among at least two signal inputs from the input portions and a signal input indicating the fact that the control portion is operating.
Claims4
An electronic control unit for a car comprising:
- a control portion which operates in accordance with signals given from a plurality of input portions including a car ignition switch to perform drive control of a predetermined output portion, said control portion stops when said control portion in not required to operate, said control portion including an operation confirmation output terminal (Q4) from which a signal input indicating the fact that said control portion is operating is output;
- a watchdog circuit for watching the operation of said control portion;
- and
- a logical sum circuit for detecting a logical sum among at least two signal inputs from said input portions and the signal input indicating the fact that said control portion is in operating, which is output from said operation confirmation output terminal (Q4),
- wherein said watchdog circuit is operated while said logical sum is detected by said logical sum circuit.
Dependencies are inferred from the claim text.