System and method for detecting torque trap in a vehicle drivetrain

    公开(公告)号:US11427081B1

    公开(公告)日:2022-08-30

    申请号:US17240233

    申请日:2021-04-26

    Abstract: A system including a first drive axle, a second drive axle, a first sensor, a second sensor, and a controller. The first sensor is configured to measure a first speed of the first drive axle. The second sensor is configured to measure a second speed of the second drive axle. The controller is in communication with the first and second sensors. The controller configured to determine an actual axle speed difference value based on the measured first speed and the measured second speed, determine an expected axle speed difference value based on a vehicle speed and a vehicle torque, compare the actual axle speed difference value and the expected axle speed difference value to obtain an error value, and generate an output signal in response to the error value being above a predetermined threshold value.

    Powertrain torque control during shift to four-wheel drive in automated-driving mode

    公开(公告)号:US12187305B2

    公开(公告)日:2025-01-07

    申请号:US17835733

    申请日:2022-06-08

    Abstract: A vehicle includes a primary axle, a secondary axle, and a powertrain. The powertrain has an engine coupled to the primary axle and selectively coupled to the secondary axle. The vehicle also includes a clutch associated with the secondary axle. A controller is programmed to, responsive to (i) a request to shift from two-wheel drive to four-wheel drive and (ii) a current engine-torque command exceeding a torque limit associated with the clutch, override the current engine-torque command to reduce a torque of the engine below the torque limit, and, responsive to the torque of the engine being less the torque limit, command engagement of the clutch.

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