Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-06-22
2000-03-07
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031152, 3031133, B60T 844
Patent
active
060330384
ABSTRACT:
An electrically augmented brake control method in which vacuum booster run-out and pedal force are accurately predicted as a function of master cylinder pressure and engine vacuum, thereby eliminating the expense of dedicated sensors for measuring the same. A mathematical model of the vacuum booster is used to estimate the apply chamber pressure and the operator brake pedal force, based on measured values of engine vacuum (or manifold absolute pressure) and master cylinder pressure. The point of vacuum booster runout can be detected as the point at which the estimated apply chamber pressure reaches atmospheric pressure. In a preferred embodiment, a force-balance approach is used to carry out the estimation in an accurate but simple manner that is especially amenable to real-time control in an automotive on-board micro-controller.
REFERENCES:
patent: 5091857 (1992-02-01), Katayama et al.
patent: 5846164 (1998-12-01), Harada
patent: 5938297 (1999-08-01), Whaite et al.
U.S. application No. 08/764,947, filed Dec. 13, 1996, Whaite et al.
Automotive Engineering, Jun. 1997, pp. 53-54.
Car and Driver, Dec. 1997, pp. 177, 180, 181, 185.
Modeling, Experimentation, Kahn, Y. et al, pp. 111-122.
Khan Yusaf Amin
Kulkarni Prakash Krishnamurthi
Wei Hong-xing
General Motors Corporation
Graham Matthew C.
Sigler Robert M.
Williams Thomas J.
LandOfFree
Brake control method having booster runout and pedal force estim does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Brake control method having booster runout and pedal force estim, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brake control method having booster runout and pedal force estim will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-356125