System and method for controlling hybrid vehicle
First Claim
1. A method for controlling a hybrid vehicle having a battery, and an engine selectively coupled to a multi-speed transmission having discrete gear ratios, comprising:
- initiating, by a controller, a gear shift of the multi-speed transmission responsive to speed of the engine exceeding a first engine speed threshold if a battery state of charge (SOC) is above an (SOC) threshold, and exceeding a second engine speed threshold if the battery state of charge is not above the SOC threshold.
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Accused Products
Abstract
A hybrid vehicle and method for reducing fuel consumption include upper and lower engine speed limits set based upon whether the state of charge of a battery electrically connected to an electric machine, which may be implemented by an integrated starter-generator is sufficiently high to permit the electric machine to provide a temporary torque boost to an engine of the motor vehicle. If the state of charge of the battery is sufficiently high to permit temporary torque boosting, then the upper and lower engine speed limits are reduced from baseline upper and lower limits to adjusted upper and lower limits to reduce fuel consumption of the engine without adversely affecting NVH.
8 Citations
20 Claims
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1. A method for controlling a hybrid vehicle having a battery, and an engine selectively coupled to a multi-speed transmission having discrete gear ratios, comprising:
initiating, by a controller, a gear shift of the multi-speed transmission responsive to speed of the engine exceeding a first engine speed threshold if a battery state of charge (SOC) is above an (SOC) threshold, and exceeding a second engine speed threshold if the battery state of charge is not above the SOC threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A hybrid vehicle comprising:
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an engine; a battery coupled to an electric machine; a multi-speed transmission, having discrete gear ratios, coupled to the engine; and a controller programmed to generate a gear shift signal for the multi-speed transmission in response to speed of the engine changing from below to not below, or changing from above to not above, an engine speed threshold that is based on a state of charge of the battery. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A hybrid vehicle having an engine, an electric machine, a battery, and a multi-speed transmission with discrete gear ratios, comprising:
a processor programmed to control upshifting of the transmission responsive to speed of the engine exceeding a first upshift threshold associated with the battery being above a threshold state of charge, and exceeding a second upshift threshold higher than the first upshift threshold associated with the battery not being above the threshold state of charge. - View Dependent Claims (17, 18, 19, 20)
Specification