Brake control method having booster runout and pedal force estimation
Patent 6033038 Issued on March 7, 2000. Estimated Expiration Date: 
June 22, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 22, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDriving force control system Apparatus for controlling negative pressure for a brake booster in a diesel engine Method and device for brake application Patent #: 5938297 InventorsAssigneeApplicationNo. 102113 filed on 06/22/1998US Classes:303/114.3, Including pneumatic power booster303/113.3, Including booster303/115.2Having electric controlExaminersPrimary: Graham, Matthew C.Assistant: Williams, Thomas J. Attorney, Agent or FirmInternational ClassB60T 008/44AbstractAn 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.Other References
Field of SearchHaving electric controlHaving vacuum motor control Including hydraulic power booster Having pump pressure control Vacuum Braking pressure demand or braking force desire Including a stroke sensor With distinct piston or diaphragm exposed to pulsator pressure imparting feel to manual control Having load deformable means between master working member and motor thrust means adjusting bias of manual control With control of or by a separate power fluid, etc. Flow in recirculating circuit controlled | |
