SPEED LIMITING OF ALTITUDE COMPENSATION FOR TARGET ENGINE SPEED IN HYBRID ELECTRIC VEHICLES
First Claim
1. A vehicle comprising:
- an engine;
first and second electric machines coupled to a traction battery and configured to operate primarily as a motor and a generator, respectively; and
a controller in communication with the engine and the first and second electric machines and configured to increase target engine speed from a sea level speed to deliver a demanded engine power at altitude up to an NVH engine speed limit.
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Accused Products
Abstract
A system and method for controlling a hybrid vehicle having an engine, first and second electric machines coupled to a traction battery and configured to operate primarily as a motor and a generator, respectively, and a controller in communication with the engine and the first and second electric machines include increasing target engine speed from a sea level speed to deliver a demanded engine power at altitude up to an NVH engine speed limit. The system and method may reduce the demanded engine power based on an attainable engine power associated with the NVH engine speed limit. A demanded wheel power may be reduced in response to the reduced engine power.
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Citations
20 Claims
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1. A vehicle comprising:
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an engine; first and second electric machines coupled to a traction battery and configured to operate primarily as a motor and a generator, respectively; and a controller in communication with the engine and the first and second electric machines and configured to increase target engine speed from a sea level speed to deliver a demanded engine power at altitude up to an NVH engine speed limit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A controller-implemented method for controlling engine speed of a vehicle having an engine and first and second electric machines electrically connected to a traction battery, comprising:
limiting engine speed to limit associated NVH in response to engine speed being increased to deliver a demanded wheel power at operating conditions where attainable engine power is reduced relative to a calibrated engine power. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer readable storage medium having stored instructions executable by a vehicle controller, comprising instructions that:
control engine speed in response to a demanded engine power based on a difference between a demanded wheel power and an electric machine power of a hybrid vehicle, the engine speed increased from a sea level engine speed to compensate for reduced engine power at current engine operating conditions, and limited based on an NVH threshold. - View Dependent Claims (16, 17, 18, 19, 20)
Specification