Multi-stroke hybrid propulsion system
First Claim
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1. A method of operating a vehicle hybrid propulsion system comprising:
- operating a vehicle engine in a two-stroke cycle to produce a first torque, and charging a battery by absorbing a first torque amount at a generator; and
thenoperating the engine in a four-stroke cycle to produce a second torque lower than the first, and charging the battery by absorbing a second torque amount, less than the first torque amount, at the generator.
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Abstract
A hybrid propulsion system for a vehicle and method of operation are described. In one example, the engine may operate in a two stroke cycle to provide increased engine torque when a recharging operation of the on-board energy storage device is requested. Further, a transition from a four stroke cycle to the two stroke cycle may be performed while maintaining the transmission in the previously selected gear ratio in response to a requested increase in charging or a requested increase in wheel torque as requested by the vehicle operator.
38 Citations
17 Claims
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1. A method of operating a vehicle hybrid propulsion system comprising:
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operating a vehicle engine in a two-stroke cycle to produce a first torque, and charging a battery by absorbing a first torque amount at a generator; and
thenoperating the engine in a four-stroke cycle to produce a second torque lower than the first, and charging the battery by absorbing a second torque amount, less than the first torque amount, at the generator. - View Dependent Claims (2, 3, 4, 5)
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6. A method of operating a hybrid propulsion system for a vehicle, including an internal combustion engine, a generator, and an energy storage device, the method comprising:
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operating the engine to produce an engine output; selectively operating the generator to charge the energy storage device by absorbing an amount of the engine output; adjusting a number of strokes performed by the engine per combustion cycle in response to a state of charge of the energy storage device; and adjusting the amount of the engine output absorbed by the generator in response to the number of strokes performed by the engine per combustion cycle. - View Dependent Claims (7, 8, 9, 10)
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11. A method of operating a hybrid propulsion system for a vehicle including an internal combustion engine, a generator, and an energy storage device, comprising:
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during a first condition, operating the engine in a two-stroke cycle to produce a first engine output and charging the energy storage device by absorbing a first amount of the first engine output at the generator; during a second condition, operating the engine in a four-stroke cycle to produce a second engine output; and transitioning the engine between operation in the two-stroke cycle and operation in the four-stroke cycle while maintaining a transmission in a same gear ratio. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification