Vehicle with an EGR-cooler and its diagnotic
US9822739B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2014 |
| Grant date | Nov 21, 2017 |
| Priority date | — |
| Expiry date | Nov 12, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M26/47
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a vehicle provided with an engine, an EGR cooler for cooling EGR gas recirculated from an exhaust channel of the engine to an intake channel thereof by using a coolant, an electric pump for supplying the coolant to the EGR cooler, and a gas temperature sensor for detecting the temperature of the EGR gas temperature at the downstream of the EGR cooler, an ECU acquires a first gas temperature in a normally stable state where the electric pump is rotating, thereafter performs a coolant amount suppressing process to suppress the rotational speed of the electric pump, acquires a second gas temperature in a suppressed stable state after a predefined time has elapsed from the start of the coolant amount suppressing process, and determines that the EGR cooler is abnormal if a difference between the first gas temperature and the second gas temperature is less than a threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.