Pneumatic tire pressure change detecting system comparing wheel speeds and weighting detection based on running conditions
US5513523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Sep 19, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C23/061
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A subtractor calculates an actual wheel speed difference between rotational speeds of left and right wheels on a motor vehicle, and a steering angle converter calculates an actual steering angle from the actual wheel speed difference. The difference between the actual steering angle and an adequate steering angle which is produced based on a lateral acceleration is compared with a predetermined reference range. If the difference between the actual and adequate steering angles exceeds the predetermined reference range, then the pneumatic pressure of a tire on one of the left and right wheels is determined as being lowered. In the steering angle converter, a weight value is established according to a running condition of the motor vehicle, and the calculated actual steering angle or comparative sensitivity is varied according to the weight value. Since the comparative sensitivity is varied according to the running condition, a reduction in the pneumatic pressure of the tire can be detected even under running conditions which lead to large errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.