Vacuum boost for vehicle braking
First Claim
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1. A method for controlling brake vacuum within a brake booster on a vehicle that includes an engine and a transmission, comprising:
- determining an intake manifold vacuum in response to actuation of a brake pedal;
downshifting the transmission to increase engine speed and intake manifold vacuum in response to the intake manifold vacuum being less than a desired brake booster vacuum; and
reducing torque of the engine to maintain a constant power output of the engine.
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Abstract
Methods for controlling vacuum within a brake booster by modifying powertrain operation include determining an intake manifold vacuum in response to actuation of a brake pedal. Increasing the intake manifold vacuum if the brake booster vacuum is less than a desired brake booster vacuum. In some embodiments, the transmission is downshifted to increase engine speed and intake manifold vacuum.
22 Citations
10 Claims
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1. A method for controlling brake vacuum within a brake booster on a vehicle that includes an engine and a transmission, comprising:
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determining an intake manifold vacuum in response to actuation of a brake pedal; downshifting the transmission to increase engine speed and intake manifold vacuum in response to the intake manifold vacuum being less than a desired brake booster vacuum; and reducing torque of the engine to maintain a constant power output of the engine. - View Dependent Claims (2, 3, 4, 5)
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6. A system for controlling brake vacuum comprising:
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an engine including an intake manifold; a transmission coupled to the engine; a brake system including a brake booster in fluid communication with the engine and a brake pedal; and a controller programmed to; determine vacuum in the intake manifold in response to actuation of the brake pedal, downshift the transmission to increase a speed of the engine and to increase the vacuum in the intake manifold in response to the vacuum of the intake manifold being less than a desired brake booster vacuum, and reduce torque of the engine to maintain a constant power output of the engine. - View Dependent Claims (7, 8, 9, 10)
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Specification