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US 11,499,626 B2Granted
System and method for changing to a low gear range of a four wheel drive vehicle
AssigneeFord Global Technologies, LLC
InventorsWeitian Chen, Matthew John Shelton, Pinzhi Liu, Jose Velazquez Alcantar, Zhengyu Dai, Hong Jiang
Life of this patent
Estimating the term…
Abstract
Methods and system are described for changing a driveline gear range from a higher gear range to a lower gear range. The driveline may include two electric machines and four clutches in a four wheel drive configuration. The methods and systems permit a driveline to change from a higher gear range to a lower gear range without stopping a vehicle.
Claims20
A method for operating a vehicle, comprising:
- decreasing output of a first electric machine coupled to a first axle and while decreasing output of a second electric machine coupled to a second axle in response to a request to disengage higher gears and engage lower gears of the first axle and second axle.
A vehicle system, comprising:
- a first electric machine coupled to a front axle;
- a second electric machine coupled to a rear axle;
- a controller including executable instructions stored in non-transitory memory to begin decreasing output of the first electric machine within a threshold amount of time of beginning to decrease output of the second electric machine in response to a request to change a driveline from a higher gear range to a lower gear range.
A method for operating a vehicle, comprising:
- decreasing output of a first electric machine coupled to a first axle to a non-zero positive torque while decreasing output of a second electric machine coupled to a second axle to the non-zero positive torque in response to a request to shift gears of the first axle and the second axle.
Dependencies are inferred from the claim text.