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US 10,974,714 B2Granted
Method and system for torque reserve estimation
AssigneeFord Global Technologies, LLC
InventorsRajit Johri, Christopher John Teslak
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for estimating a maximum available torque reserve prior to a gear upshift and then during the upshift, generating the torque reserve to fill a torque hole. In one example, a method may include estimating a maximum torque reserve based on each of a driver torque demand, an auxiliary system demand, and a maximum generable engine torque and then opportunistically generating the torque reserve.
Claims15
A method for a hybrid vehicle, comprising:
- during a first gear upshift,
- estimating a first maximum torque reserve of the hybrid vehicle based on an engine torque reserve and a motor torque reserve;
- and then
- generating a first torque reserve by adjusting vehicle operation, wherein the adjusting vehicle operation is based on a difference between a transmission input torque and a transmission output torque during the first gear upshift, the first torque reserve lower than the first maximum torque reserve of the hybrid vehicle;
- and
- during a second gear ratio upshift,
- estimating a second maximum available torque reserve of the hybrid vehicle based on the engine torque reserve and the motor torque reserve;
- and then
- generating a second torque reserve by adjusting the vehicle operation, the second torque reserve equal to the second maximum available torque reserve.
6 more elements
A method for a hybrid vehicle comprising:
- during a first upshift event in a transmission system gear ratio,
- estimating a first maximum available torque reserve based on an engine torque demand and a motor torque reserve and then generating a first torque reserve by adjusting vehicle operation, the first torque reserve lower than the first maximum available torque reserve;
- and
- during a second upshift event in the transmission system gear ratio,
- estimating a second maximum available torque reserve based on the engine torque demand motor torque reserve, and then
- generating a second torque reserve by adjusting the vehicle operation, the second torque reserve equal to the second maximum available torque reserve.
3 more elements
A vehicle system, comprising:
- a controller with computer readable instructions stored on non-transitory memory that, when executed, cause the controller to:
- prior to a request for a motor hybrid transmission system gear ratio upshift,
- estimate a non-zero maximum torque reserve based on one or more of a driver torque demand, an auxiliary system torque demand, a maximum generable engine torque, and a maximum available motor torque;
- in response to the request for the gear ratio upshift,
- generate a torque reserve by adjusting spark timing and/or throttle opening, wherein an amount of spark timing adjustment is estimated based on a difference between a transmission input torque and a transmission output torque during the gear ratio upshift, the amount of spark timing adjustment directly proportional to the difference between the transmission input torque and the transmission output torque;
- during a first gear ratio upshift, estimate a first maximum available torque reserve based on an engine torque reserve and a motor torque reserve and then generate a first torque reserve by adjusting the spark timing and/or the throttle opening, the first torque reserve lower than the first maximum available torque reserve;
- and
- during a second gear ratio upshift, estimating a second maximum available torque reserve based on the engine torque reserve and the motor torque reserve and then generating a second torque reserve by adjusting the spark timing and/or the throttle opening, the second torque reserve equal to the second maximum available torque reserve.
5 more elements
Dependencies are inferred from the claim text.