System and method for engine driveline disconnect during regeneration in hybrid vehicles
First Claim
1. A method for operating a hybrid vehicle having an eMachine and an engine using a hybrid controller, comprising:
- determining an expected fuel rate reduction of the engine at a first time between a first operating condition occurring when the engine is coupled to a vehicle transmission by a clutch, and a second operating condition occurring when the engine is decoupled from the vehicle transmission by the clutch; and
decoupling the engine from the vehicle transmission from the first operating condition to the second operating condition using the clutch at a second time after the first time if the expected fuel rate reduction is greater than an idle fuel rate of the engine;
wherein said determining expected fuel rate reduction comprises determining an expected energy storage rate increase due to a transition from the first to the second operating condition; and
multiplying said expected energy storage rate increase by a hybrid efficiency index.
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Abstract
A system and method for operating a hybrid vehicle having an engine and an eMachine coupled by a clutch using a hybrid controller is presented. The method determines an idle fuel rate of the engine, determines a hybrid efficiency index for the hybrid vehicle, determines an expected energy storage rate increase for an operating condition where the engine is decoupled from a vehicle transmission using said clutch, multiplies the expected energy storage rate increase by the hybrid efficiency index to determine an expected fuel rate reduction of the engine in the operating condition; and decouples the engine from the vehicle transmission using the clutch if the expected fuel rate reduction is greater than the idle fuel rate.
109 Citations
26 Claims
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1. A method for operating a hybrid vehicle having an eMachine and an engine using a hybrid controller, comprising:
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determining an expected fuel rate reduction of the engine at a first time between a first operating condition occurring when the engine is coupled to a vehicle transmission by a clutch, and a second operating condition occurring when the engine is decoupled from the vehicle transmission by the clutch; and decoupling the engine from the vehicle transmission from the first operating condition to the second operating condition using the clutch at a second time after the first time if the expected fuel rate reduction is greater than an idle fuel rate of the engine; wherein said determining expected fuel rate reduction comprises determining an expected energy storage rate increase due to a transition from the first to the second operating condition; and multiplying said expected energy storage rate increase by a hybrid efficiency index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A hybrid system, comprising:
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an engine; an eMachine; a transmission operatively coupled to the eMachine; a clutch operatively coupling the engine to the transmission; and a hybrid controller, said hybrid controller configured to; determine an expected fuel rate reduction of the engine at a first time between a first operating condition occurring when the engine is coupled to the transmission by the clutch and a second operating condition occurring when the engine is decoupled from the transmission by the clutch; decouple the engine from the vehicle transmission from the first operating condition to the second operating condition using the clutch at a second time after the first time if the expected fuel rate reduction is greater than an idle fuel rate of the engine; determine an expected energy storage rate increase due to a transition from the first to the second operating condition; and multiply said expected energy storage rate increase by a hybrid efficiency index to determine the expected fuel reduction rate. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification