DE-102024210768-A1 - Tax procedure for a driver assistance function in a motor vehicle

DE102024210768A1DE 102024210768 A1DE102024210768 A1DE 102024210768A1DE-102024210768-A1

Abstract

The invention relates to a control method for a driver assistance function (20) in a motor vehicle (10) with a braking device (16) for braking the motor vehicle (10) by building up a braking torque (48) of the braking device (16), wherein the driver assistance function (20) comprises automatically maintaining the braking function to hold the motor vehicle (10) in a holding and starting situation (12), wherein the holding and starting situation (12) comprises starting the motor vehicle (10) from a standstill with a starting movement (22).

Inventors

Klaus Berger
Oliver Huth
Arun Radhakrishnan Nair
Erec Fahlbusch
Kevin Kiwus

Assignees

AUMOVIO GERMANY GMBH

Dates

Publication Date: 20260513
Application Date: 20241108

Claims (15)

Control method for a driver assistance function (20) in a motor vehicle (10) with a braking device (16) for braking the motor vehicle (10) by building up a braking torque (48) of the braking device (16), wherein the driver assistance function (20) comprises automatically maintaining the braking function to hold the motor vehicle (10) in a holding and starting situation (12), wherein the holding and starting situation (12) comprises starting the motor vehicle (10) from a standstill with a starting movement (22), the control method in the holding and starting situation (12) comprising: a) When automatically maintaining the braking function, acquiring an input to generate a drive torque to start the motor vehicle (10); b) Releasing the braking function by reducing the braking torque (48); and c) Control of the braking torque (48) and/or the drive torque to adapt the starting motion (22) depending on the stopping and starting situation (12).
Tax procedure according to Claim 1 , characterized in that the stopping and starting situation (12) comprises: c1) a stopping and starting inclination (24) in relation to the starting movement (22), preferably a stopping and starting gradient (28) in the direction of the starting movement (22); and/or c2) a setting, a condition and/or a load of the motor vehicle (10).
Control method according to one of the preceding claims, characterized in that the dismantling in step b) is further carried out depending on the holding and starting situation (12).
Control method according to one of the preceding claims, characterized in that steps b) and c) further comprise: b1) monitoring and/or detecting one or more start-up movement indicators (32) to indicate the start-up movement (22) of the motor vehicle (10) from a standstill; and c3) adjusting depending on the monitoring and/or on the one or more detected start-up movement indicators (32).
Tax procedure according to Claim 4 , characterized in that the starting motion indicator tor (32) includes a vehicle and/or wheel position, a vehicle and/or wheel speed (42), a vehicle and/or wheel acceleration and/or each of these changes from a standstill.
Tax procedure according to Claim 4 or 5 , further comprising: d) Terminating the adjustment of the starting movement (22) when the motor vehicle (10) detects a predefined starting movement (44), preferably a predefined starting distance, a predefined starting speed and/or a predefined starting acceleration.
A control method according to one of the preceding claims, characterized in that step c) further comprises one, several or all of the following steps: c4) controlling the braking torque (48) by holding and/or increasing it; c5) controlling the braking torque (48) by decreasing it more slowly than in step b); c6) controlling the braking torque (48) by moving it along a predefined braking torque curve (50), preferably a predefined pressure curve (52), wherein the braking torque curve (50) comprises: - a braking torque reduction gradient that is less than a braking torque reduction gradient in step b), - a stepped braking torque profile in any number of sub-steps, - a parabolic braking torque profile, - a hyperbolic braking torque profile, and/or - a braking torque profile with a braking torque build-up and a subsequent braking torque reduction.
Control method according to one of the preceding claims, characterized in that step a) further comprises: a1) capturing the input for starting the motor vehicle (10) by monitoring an accelerator pedal deflection (34), the drive torque, an engine speed, an axle torque and/or a starting torque (38) of the motor vehicle (10).
Control method according to one of the preceding claims, characterized in that the starting movement (22) comprises a starting speed, a starting acceleration (30) and/or a starting jerk and/or that the adjustment comprises a reduction of the starting movement (22).
Control method according to one of the preceding claims, characterized in that the braking torque (48) is generated hydraulically, electrically, pneumatically and/or mechanically.
Starting procedure for a driver assistance function (20) in a motor vehicle (10) with a braking device (16) for braking the motor vehicle (10) by building up a braking torque (48) of the braking device (16), wherein the driver assistance function comprises automatically maintaining the braking function to hold the motor vehicle (10) in a holding and starting situation (12), wherein the holding and starting situation (12) comprises starting the motor vehicle (10) from a standstill with a starting movement (22), the starting procedure in the holding and starting situation (12) comprising: e) detecting an actuation of an accelerator pedal of the motor vehicle (10) as input for generating the drive torque to start the motor vehicle (10) by monitoring an accelerator pedal deflection (34) and/or a speed thereof; and f) Depending on the accelerator pedal deflection (34) and/or the speed thereof, carrying out the control method according to one of the preceding claims.
Control device and/or starting device for a driver assistance function (20) in a motor vehicle (10) with a braking device (16) for braking the motor vehicle (10) by building up a braking torque (48) of the braking device (16), wherein the driver assistance function (20) comprises the automatic maintenance of the braking function for holding the motor vehicle (10) in a holding and starting situation (12), wherein the holding and starting situation (12) comprises starting the motor vehicle (10) from a standstill with a starting movement (22), the control device and/or the starting device comprising means adapted to enable the control procedure according to one of the Claims 1 until 10 or the starting procedure according to Claim 11 carry out.
Motor vehicle (10) with a braking device (16) for braking the motor vehicle (10) by building up a braking torque (48) of the braking device (16), the motor vehicle (10) comprising a control unit and/or a starting device for a driver assistance function (20) in the motor vehicle (10) according to Claim 12 .
Computer program comprising commands that cause a control unit and/or a starting device for a driver assistance function (20) in a motor vehicle (10) to perform the control procedure according to one of the Claims 1 until 10 or the starting procedure according to Claim 11 executes.
Computer-readable storage medium on which the computer program is stored. Claim 14 is stored.

Description

TECHNICAL AREA The invention relates to a control method for a driver assistance function in a motor vehicle. The invention further relates to a starting method for the driver assistance function, a control unit, a starting device, a motor vehicle, a computer program, and a computer-readable storage medium. BACKGROUND When a vehicle attempts to start moving downhill on a slope using a driver assistance system, an unpleasant jolt can occur. This jolt can arise because several forces act on the vehicle in the same direction, and the holding force may not be reduced gradually. Due to its mass and the slope of the road, the vehicle experiences a downward force acting towards the slope. To detect the driver's intention to start moving via the driver assistance function, the accelerator pedal is primarily monitored. To prevent false starts, accelerator pedal thresholds are defined. This generates additional drive torque from the engine, which also acts downhill. Particularly with automated manual transmissions, this force can be amplified by the rapid engagement of the transmission clutch. The force acting downhill is therefore the sum of the force exerted by gravity on the slope and the engine's drive torque. When the accelerator pedal reaches the threshold for releasing the start-up function, the vehicle may lurch forward after the hold function is released due to the forces/torques acting upon it. The driver perceives an acceleration in the opposite direction of travel, caused by their own inertia. This can be an unpleasant sensation. This initial lurch can generate accelerations of up to 0.3 g. Rapid acceleration can also pose a risk if another vehicle is parked in front of the vehicle. SUMMARY OF THE INVENTION The invention aims to improve the starting behavior of a driver assistance function in a motor vehicle. To solve this problem, the invention provides a control method for a driver assistance function in a motor vehicle according to claim 1. A starting method for the driver assistance function, a control device, a starting device, a motor vehicle, a computer program, and a computer-readable storage medium are the subject of the dependent claims. Advantageous embodiments are the subject of the sub-claims. According to one aspect, the invention provides a control method for a driver assistance function in a motor vehicle with a braking device for braking the motor vehicle by building up a braking torque of the braking device. Here, the driver assistance function includes automatically maintaining the braking function to hold the motor vehicle in a holding and starting situation, wherein the holding and starting situation includes starting the motor vehicle from a standstill with a starting movement. The control method comprises the following in the holding and starting situation: a) When automatically maintaining the braking function, detecting an input to generate a drive torque to start the motor vehicle; b) Releasing the braking function by reducing the braking torque; and c) Controlling the braking torque and/or the drive torque to adapt the starting movement depending on the stopping and starting situation. One advantage of the control method can be that the starting movement can be adjusted (influenced or optimized) with regard to driving comfort. A sudden jolt when starting can be minimized, for example, by adjusting the brake torque control during acceleration. Alternatively, or in addition to adjusted brake torque control, the drive torque can be adjusted. The adjustment (influencing or optimizing) of the acceleration motion is carried out depending on the stopping and starting situation. This can increase driving comfort and/or safety. It is preferred that the stopping and starting situation includes: c1) a holding and starting incline with respect to the starting movement, preferably a holding and starting gradient in the direction of the starting movement; and/or c2) a setting, condition and/or load of the motor vehicle. One advantage of this control method can be that the starting movement can be adjusted, for example, depending on a setting, a The control system can be adapted to the vehicle's condition and/or load. For example, the starting movement may not be adjusted, or may be adjusted differently (e.g., to a greater extent), if the vehicle is comparatively heavily loaded. Furthermore, the starting movement may not be adjusted, or may be adjusted differently (e.g., to a lesser extent), in situations where there is essentially no incline, compared to situations with a gradient or incline. Additionally, the starting movement may be adjusted differently (e.g., to a greater extent) on a gradient than on an incline. The control system can thus be adapted to the specific stopping and starting situation and the forces acting upon it. This can improve driving comfort and/or safety. It is preferred that the dismantling in step b) is further carried out depending on the stopping and starting situa