A method for controlling the engagement and/or disengagement of a parking lock of a transmission of a vehicle, in particular of a motor vehicle

Methods and systems for a hydromechanical transmission in a vehicle are provided herein. In one example, the transmission system includes a hydrostatic assembly with a hydraulic pump in fluidic communication with a hydraulic motor. The transmission system further includes a controller configured to selectively transition between a torque control mode and a speed control mode of the hydrostatic assembly while the vehicle is on a slope.

A commercial vehicle includes at least one driven axle, a service brake, at least one propulsion engine, and wheels. A parking brake function of the vehicle is achieved by a bistable locking means that acts on both wheels. A first and second multi-speed gearbox having respective first and second gear stages are each activated by an actuator and coupled to the wheels. The parking brake function is achieved at least in-part by concurrently activating the first and second gear stages. A computing device is configured to activate the bistable locking means when the commercial vehicle is at a standstill and configured to send a brake request via an electronic signal to an electronic brake control unit to activate the service brake.

A commercial vehicle with at least one driven axle, at least one service brake, at least one propulsion engine, and wheels characterized in that the parking brake function of the vehicle is solved by a bistable locking means acting on both wheels. At least one multi-speed gearbox is provided to concurrently activate a first gear stage and a second gear stage having different ratios.

An apparatus and a method for controlling operation of a vehicle includes a controller having a processor and a tangible, non-transitory memory. The vehicle includes a park assembly with a park actuator motor having an actuator shaft. The vehicle has a park mode and an out-of-park mode. The controller is configured to determine if the park actuator motor has reached an out-of-park position when a shift command to the out-of-park mode is received. The controller is configured to obtain and store at least one dynamic parameter associated with the park actuator motor prior to the detent member reaching the out-of-park position. The method includes determining a load factor based on the dynamic parameter over time when at least one of a predefined time threshold and a predefined motor position threshold is reached. Operation of the vehicle is controlled based at least partially on the load factor.

A commercial vehicle with at least one driven axle, at least one service brake, at least one propulsion engine, and wheels characterized in that the parking brake function of the vehicle is solved by a bistable locking means acting on both wheels. At least one multi-speed gearbox is provided to concurrently activate a first gear stage and a second gear stage having different ratios.

Methods and systems for a hydromechanical transmission in a vehicle are provided herein. In one example, the transmission system includes a hydrostatic assembly with a hydraulic pump in fluidic communication with a hydraulic motor. The transmission system further includes a controller configured to selectively transition between a torque control mode and a speed control mode of the hydrostatic assembly while the vehicle is on a slope.

An apparatus and a method for controlling operation of a vehicle includes a controller having a processor and a tangible, non-transitory memory. The vehicle includes a park assembly with a park actuator motor having an actuator shaft. The vehicle has a park mode and an out-of-park mode. The controller is configured to determine if the park actuator motor has reached an out-of-park position when a shift command to the out-of-park mode is received. The controller is configured to obtain and store at least one dynamic parameter associated with the park actuator motor prior to the detent member reaching the out-of-park position. The method includes determining a load factor based on the dynamic parameter over time when at least one of a predefined time threshold and a predefined motor position threshold is reached. Operation of the vehicle is controlled based at least partially on the load factor.

A method for holding a vehicle on a gradient. The vehicle has a transmission with an output, a first clutch and a second clutch. The primary sides of the first and second clutches are mechanically operatively connected to one another. The secondary sides of the first and second clutches are mechanically operatively connected to one another and to the output of the transmission. Different transmission ratios can be engaged by way of the first clutch and the second clutch, and the first clutch is in an engaged state. The method includes the additional closure of the second clutch in order to block the transmission and thus hold the vehicle at a standstill on a gradient.

Disclosed is method for operating a multi-gear vehicle transmission having a plurality of shifting elements (A, B, C, D, E) for engaging gears of the vehicle transmission. In a neutral gear a transmission input (1) and a transmission output (2) of the vehicle transmission are decoupled from one another. In a driving gear the transmission input (1) and the transmission output (2) of the vehicle transmission are coupled with one another by closing the shifting elements (A, B, C, D, E) associated with the driving gear in order to propel the vehicle. When the neutral gear is engaged, a transmission condition is determined, and if a transmission condition with elevated drag losses exists, then in addition to the shifting elements (A, B, C, D, E) of a driving gear, at least one further shifting element (A, B, C, D, E) of the vehicle transmission is closed.