Memory check apparatus and method for checking data upon retrieval from memory
US6216084A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1999 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Jul 29, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/249
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a control apparatus and method for vehicles, control data such as engine air-fuel ratio correction values are learned and stored in a backup RAM to be used in engine control. Before the data are actually used in the engine control, not all the stored data are checked but only the data read out from the backup RAM to be used for control calculation are checked. Thus, all the memory data necessary are ensured to be checked in a short period of time, and improper control operation resulting from erroneous data can be obviated. Further, abnormality checking of all the stored data is executed at a specified timing separately. When the abnormality is found in any of the data, all the data in the backup RAM are initialized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.