Methods and systems for transitioning between driveline braking modes
First Claim
Patent Images
1. A method for controlling driveline braking, comprising:
- providing driveline braking via an electric machine while rotation of an engine is stopped;
operating the electric machine in a speed control mode in response to a request to provide driveline braking via the engine;
starting the engine;
accelerating the engine to a speed of the electric machine; and
closing an open driveline disconnect clutch in response to engine speed substantially equaling electric machine speed.
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Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, a method for transitioning between regenerative braking and engine braking is described.
50 Citations
20 Claims
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1. A method for controlling driveline braking, comprising:
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providing driveline braking via an electric machine while rotation of an engine is stopped; operating the electric machine in a speed control mode in response to a request to provide driveline braking via the engine; starting the engine; accelerating the engine to a speed of the electric machine; and closing an open driveline disconnect clutch in response to engine speed substantially equaling electric machine speed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling driveline braking, comprising:
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providing driveline braking via an electric machine while rotation of an engine is stopped; starting and rotating the engine; injecting fuel to the engine; accelerating the engine to a speed of the electric machine; and discontinuing to inject fuel to the engine and providing driveline braking via the engine while the electric machine outputs less than a threshold amount of current. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A vehicle system, comprising:
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an engine; a dual mass flywheel (DMF) including a first side mechanically coupled to the engine; a driveline disconnect clutch mechanically including a first side coupled to a second side of the dual mass flywheel; a driveline integrated starter/generator (DISG) including a first side coupled to a second side of the driveline disconnect clutch; a starter other than the DISG including a base state where the starter is not engaged to the engine; a transmission selectively coupled to the engine via the driveline disconnect clutch; and a controller including non-transitory instructions executable to automatically stop the engine, provide driveline braking via the DISG while engine rotation is stopped, start the engine in response to a state of charge of an energy storage device, stop combustion in the engine while the engine is rotating, and provide driveline braking via the engine. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification