Method and device for activating an electric vacuum pump for a brake booster of a vehicle
US9869310B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 2012 |
| Grant date | Jan 16, 2018 |
| Priority date | — |
| Expiry date | Jun 24, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/02
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Described are a method and a device for activating an electric vacuum pump for a brake booster of a vehicle. The brake booster is supplied with a vacuum from a vacuum reservoir. The vacuum pump is designed to increase the vacuum in the vacuum reservoir as soon as the vacuum drops below a predefinable switch-on threshold. In order to avoid unnecessarily frequent switching on of the vacuum pump, which may irritate the driver, an expected decrease of the vacuum in the vacuum reservoir as a result of an instantaneous braking operation is estimated and the switch-on threshold of the vacuum pump is temporarily reduced if the vacuum instantaneously prevailing in the vacuum reservoir minus the estimated vacuum decrease is greater than a predetermined adjustment point vacuum, below which the brake booster can no longer act in a sufficiently boosting manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.