Hill detection and grade percent estimation logic for an all-wheel drive system
First Claim
1. A vehicle driveline system, comprising:
- a drive unit configured to divide torque between a primary axle and a secondary axle of a vehicle, wherein the drive unit is configured to employ a first torque split for traversing level surfaces below a threshold vehicle speed, wherein a first share of the torque is distributed to the primary axle of the vehicle, and a second share of the torque is distributed to the secondary axle of the vehicle;
wherein the drive unit is configured to detect a first gradient while the vehicle driveline system is traversing the first gradient using a baseline torque split, the first gradient having a positive grade exceeding a grade threshold, the drive unit configured to modify the second share of torque with respect to the first share of torque in response to the detection of the first gradient while traversing the first gradient below the threshold vehicle speed.
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Abstract
Example methods for distributing torque in a driveline, and driveline systems are disclosed. In one approach, a baseline torque split may be employed, e.g., in a drive unit. The method may further include detecting a first gradient of a first driving surface that exceeds a threshold amount while the driveline is traversing the first gradient using the baseline torque split. The method may further include modifying the second share of torque with respect to the first share of torque in response to the detection of the first gradient. In some examples, a modification may include increasing an amount of torque being distributed to a secondary axle of the vehicle, while in others a torque bias between the primary and secondary axle may be reduced.
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Citations
21 Claims
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1. A vehicle driveline system, comprising:
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a drive unit configured to divide torque between a primary axle and a secondary axle of a vehicle, wherein the drive unit is configured to employ a first torque split for traversing level surfaces below a threshold vehicle speed, wherein a first share of the torque is distributed to the primary axle of the vehicle, and a second share of the torque is distributed to the secondary axle of the vehicle; wherein the drive unit is configured to detect a first gradient while the vehicle driveline system is traversing the first gradient using a baseline torque split, the first gradient having a positive grade exceeding a grade threshold, the drive unit configured to modify the second share of torque with respect to the first share of torque in response to the detection of the first gradient while traversing the first gradient below the threshold vehicle speed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vehicle driveline, comprising:
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a primary axle configured to impart rotational force to a first set of vehicle wheels; a secondary axle configured to impart rotational force to a second set of vehicle wheels, wherein the primary and secondary axles are configured to distribute torque using a first torque split for traversing level surfaces below a threshold vehicle speed, wherein a first share of the torque is distributed to the primary axle and a second share of the torque is distributed to the secondary axle; and a controller configured to detect a first gradient while the vehicle driveline is traversing the first gradient using a baseline torque split, the first gradient having a positive grade exceeding a grade threshold, the controller configured to modify the second share of torque with respect to the first share of torque in response to the detection of the first gradient while traversing the first gradient below the threshold vehicle speed. - View Dependent Claims (9)
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10. A method of managing torque imparted to a vehicle driveline, comprising:
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determining a baseline torque split for traversing level surfaces below a threshold vehicle speed, wherein a first share of torque is distributed to a primary axle of the vehicle driveline, and a second share of torque is distributed to a secondary axle of the vehicle driveline; detecting a first gradient of a first driving surface while the vehicle driveline is traversing the first gradient using the baseline torque split, the first gradient having a positive grade exceeding a grade threshold; and modifying the second share of torque with respect to the first share of torque in response to the detection of the first gradient while traversing the first gradient below the threshold vehicle speed. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification