Volvo Truck Corporation

Teodoro Bora

Johan Fries

Viktor Lägnert

Ramadan Salif

Hans Bernler

Therese Mäsak

Laurent Boisson

A method for controlling motion by a heavy-duty vehicle, where the vehicle is arranged to be controlled based on a target longitudinal wheel slip of at least one driven wheel on the vehicle. The method includes: monitoring an acceleration of the vehicle; monitoring a current longitudinal wheel slip of the at least one driven wheel; reducing the target longitudinal wheel slip of the at least one driven wheel in case the monitored acceleration of the vehicle decreases while the monitored current longitudinal wheel slip is non-decreasing; and controlling wheel slip of the at least one driven wheel based on the target longitudinal wheel slip.

Wheel slip-based motion control for heavy-duty vehicles

A method for controlling a rotational speed of an output shaft of a propulsion unit. The method includes determining a speed setpoint value, indicative of a rotational speed setpoint for the output shaft, and an actual speed value, indicative of an actual rotational speed of the output shaft, determining an acceleration value using an acceleration value determination procedure comprising employing an acceleration conversion function that uses the speed setpoint value, the actual speed value and an acceleration setting member as inputs and which produces a resulting value to be used for determining the acceleration value, determining a torque request value using a torque conversion operation that uses the acceleration value, and controlling the propulsion unit using the torque request value.

Method for controlling a rotational speed of an output shaft of a propulsion unit

A method for controlling propulsion of a heavy-duty vehicle, where the heavy-duty vehicle comprises a differential drive arrangement arranged in connection to a drive axle with a left wheel and a right wheel is provided. The method includes determining a nominal shaft slip corresponding to a desired wheel force to be generated by the drive axle wheels, wherein the nominal shaft slip is indicative of a difference between a current vehicle velocity and a vehicle velocity corresponding to the shaft speed, determining a difference between a speed of the left wheel and a speed of the right wheel, adjusting the nominal shaft slip in dependence of a magnitude of the wheel speed difference to a target shaft slip, and controlling the shaft speed based on the target shaft slip.

Method for controlling propulsion of a heavy-duty vehicle

A computer system, comprising processing circuitry configured to: determine that an auxiliary brake power is insufficient to prevent a vehicle running along a downhill road segment from exceeding a maximum engine speed, determine a utilization rate of one or more service brakes of the vehicle to prevent the vehicle from exceeding the maximum engine speed along the downhill road segment, determine that the utilization rate exceeds a predetermined threshold, and based on the utilization rate exceeding the predetermined threshold, control a downshift of the vehicle to increase the auxiliary brake power.

Method and computer system for engine speed control

The invention provides a method for controlling a vehicle () comprising a drivetrain comprising at least one drive device () adapted to generate mechanical power, the method comprising—controlling the vehicle to perform a mission comprising a plurality of stages (MS-MS), —collecting operational data relevant to the operation of the drivetrain, wherein the operational data indicate a de-rate of a component of the drivetrain, a fault of a component of the drivetrain, and/or an environmental condition which influences the drivetrain operation, —determining an expected mission stage (MS-MS), —determining, in dependence on the operational data, the propulsive capacity (CA-CA) in at least two different operational areas (A-A) of the drive device (), —mapping the operational area propulsive capacities (CA-CA) to the expected mission stage (MS-MS), and —controlling the vehicle () in dependence on said mapping.

Method for controlling a vehicle

Methods for controlling a transmission of a vehicle are provided. Such methods include

Method for controlling a transmission of a vehicle

The invention provides a method for controlling braking of a vehicle () driving along a downhill portion of a road, the vehicle comprising a propulsion arrangement (), for the propulsion of the vehicle, the method comprising dividing the road portion into a plurality of sections (RS-RS), the sections comprising a first section (RS), and a second section (RS) following, in the direction of travel of the vehicle, immediately upon the first section (RS), determining, for the road portion, a road portion control strategy, with a condition that braking on the road portion is done at least partly by means of the propulsion arrangement (), wherein determining the road portion control strategy comprises determining a speed (SD), on the second section (RS), with an aim to minimize the time travelled on the second section, and/or, where the propulsion arrangement comprises an internal combustion engine (), and a gearbox (), determining a gear selection (GS) on the second section (RS), with an aim to minimize the time travelled on the second section, and wherein determining the road portion control strategy comprises determining, for the first section (RS), a first section control strategy, with an aim to minimize the time travelled on the first section, and with an aim to provide a vehicle speed at the end of the first section (RS) which is the same as said determined speed (SD) on the second section (RS), and/or to provide a gear selection at the end of the first section which is the same as said determined gear selection (GS) on the second section (RS), the method further comprising controlling the vehicle () according to the determined road portion control strategy.

Method for controlling braking of a vehicle

The invention relates to a method for a control unit () for stopping a vehicle () when stopping at different types of stop positions (), the method comprising the following steps: &#x2014;(S) the control unit receiving input about a specific stop position for the vehicle, associated with when the vehicle is about to stop during a stopping sequence, the input being indicative of whether the specific stop position requires a high-precision stop or if a stop with a lower precision can be used; and &#x2014;(S) when the stop position requires a high-precision stop, the control unit controlling the stopping sequence such that the vehicle stops with a first stopping precision level with respect to the specific stop position, and when a lower precision can be used for the stop, the control unit controlling the stopping sequence such that the vehicle stops with a second stopping precision level which is lower than the first precision level. The invention further relates to a control unit and to a vehicle comprising the control unit.

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Gothenburg, Sweden

Teodoro Bora