Malfunction diagnosing apparatus for electronic control system for vehicles
US4246566A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 17, 1979 |
| Grant date | Jan 20, 1981 |
| Priority date | — |
| Expiry date | Apr 17, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2270/403
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An apparatus for diagnosing a malfunction of an electronic control system including sensors for electrically sensing conditions of sensing points of a vehicle and an electronic calculation unit for determining an energizing condition of an actuator for controlling a vehicle operation in accordance with output signals from the sensors is disclosed. The malfunction diagnosing apparatus is inserted intermediate of wires which connect the sensors or the actuator and the electronic control system, and when a voltage or current level on any wire assumes a non-steady state, the malfunction diagnosing apparatus determines that a malfunction has occurred at a portion associated with that wire and memorizes and holds the occurrence of the malfunction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.