DE-102024210769-A1 - Control procedures in a motor vehicle during a stop and start situation

DE102024210769A1DE 102024210769 A1DE102024210769 A1DE 102024210769A1DE-102024210769-A1

Abstract

The invention relates to a control method in a motor vehicle (10) with a locking device (16) for holding the motor vehicle (10) by locking the holding function by an electric motor of the locking device (16) in a holding and starting situation (12), wherein the holding and starting situation (12) includes releasing the holding function from a holding of the motor vehicle (10) and starting the motor vehicle (10) 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 procedure in a motor vehicle (10) with a locking device (16) for holding the motor vehicle (10) by locking the holding function by an electric motor of the locking device (16) in a holding and starting situation (12), wherein the holding and starting situation (12) includes releasing the holding function from a holding of the motor vehicle (10) and starting the motor vehicle (10) with a starting movement (22), the control procedure in the holding and starting situation (12) comprising: a) when the holding function is engaged, detecting an action point (30) of the holding device (16) via the electric motor; b) detecting an input to generate a drive torque to start the motor vehicle (10); and c) operating the electric motor to release the holding function and, with respect to the detected action point (30), to adjust the starting movement (22) depending on the holding and starting situation (12), and/or operating the electric motor to release the holding function and to control the drive torque with respect to the detected action point (30) to adjust the starting movement (22) depending on the holding 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), in particular a stopping and starting gradient (28) in the direction of the starting movement (22); and/or c2) an adjustment, a condition and/or a load of the motor vehicle (10).
Control method according to one of the preceding claims, characterized in that step a) further comprises: a1) Detecting the point of action (30) by monitoring an indicator quantity (32) of the electric motor to indicate the point of action (30) when determining the holding function, preferably an operating current (34) of the electric motor.
Control method according to one of the preceding claims, characterized in that steps a) and c) further comprise: a2) detecting the point of action (30) with respect to an effect variable (33) to indicate an effect of the electric motor, preferably with respect to an operating position (x), an operating distance, an operating speed and/or an operating time (t) of the electric motor; and c3) monitoring the effect variable (33) during operation of the electric motor and adjusting with respect to the effect variable (33).
Control method according to one of the preceding claims, further comprising one or both of the following steps: d1) Terminating the adjustment of the starting movement (22) when the effective point (30) of the locking device (16) is exceeded; and/or d2) Terminating the adjustment of the starting movement (22) when a predefined starting movement (36), preferably a predefined starting distance, a predefined starting speed and/or a predefined starting acceleration, is detected by the motor vehicle (10).
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) commencing adapted operation of the electric motor and/or commencing adapted control of the drive torque before or upon reaching the effective point (30); and/or adapted operation of the electric motor and/or adapted control of the drive torque before and/or passing the effective point (30); c5) operating the electric motor with respect to the detected effective point (30) at a reduced mean operating speed of the electric motor; c6) operating the electric motor with respect to the detected effective point (30) at an irregular operating speed; and/or c7) operating the electric motor with respect to the detected effective point (30) in a plurality of operating intervals (46).
Control method according to one of the preceding claims, characterized in that step c) further comprises one or both of the following steps: c8) operating the electric motor with respect to the detected operating point (30) by pulsed a supply voltage (41) of the electric motor; and/or c9) operating the electric motor with respect to the detected operating point (30) by modulating a supply voltage (41) of the electric motor.
Control method according to one of the preceding claims, characterized in that step b) further comprises: b1) capturing the input for starting the motor vehicle by monitoring an accelerator pedal deflection, the drive torque, an engine speed, an axle torque and/or a starting torque 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 and/or a starting jerk and/or that the adjustment of the starting movement (22) comprises a reduction of the starting movement (22).
Control method according to one of the preceding claims, characterized in that in step c) the operation of the electric motor is carried out by a driver assistance function (20) of the motor vehicle (10) when the input to the generator the drive torque for starting the motor vehicle (10) is recorded.
Starting method in a motor vehicle (10) with a holding device (16) for holding the motor vehicle (10) by locking the holding function by an electric motor of the holding device (16) in a holding and starting situation (12), wherein the holding and starting situation (12) comprises releasing the holding function from a holding position of the motor vehicle (10) and starting the motor vehicle (10) with a starting movement (22), the starting method 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 for starting the motor vehicle (10) by monitoring an accelerator pedal deflection and/or its speed; and f) depending on the accelerator pedal deflection and/or its speed, carrying out the control method according to one of the preceding claims.
Control device and/or starting device for a motor vehicle (10) with a holding device (16) for holding the motor vehicle (10) by means of locking the holding function by an electric motor of the holding device (16) in a holding and starting situation (12), wherein the holding and starting situation (12) comprises releasing the holding function from a holding position of the motor vehicle (10) and starting the motor vehicle (10) with a starting movement (22), the control device and/or the starting device comprising means which are 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 locking device (16) for holding the motor vehicle (10) by locking the holding function by an electric motor of the locking device (16) in a holding and starting situation (12), the motor vehicle (10) comprising a control unit and/or a starting device according to Claim 12 .
Computer program comprising commands that cause a control unit and/or a starting device 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 in a motor vehicle during a stop and start-up situation. The invention further relates to a start-up method for the motor vehicle, a control device, a start-up 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 function such as the "Electric Parking Brake (EPB)," 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 released gradually. Due to its mass and the slope of the road, the vehicle experiences a downward force of gravity acting towards the slope. To detect the driver's intention to start moving via the driver assistance function, the accelerator pedal is primarily monitored. Threshold values are used to prevent false starts. This generates an additional drive torque from the engine, which also acts downhill. Particularly with automated manual transmissions, this torque 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 starting function, the vehicle may lurch forward after the mechanical holding function (electric parking brake (EPB)) 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 motor vehicle. To solve this problem, the invention provides a control method in a motor vehicle according to claim 1. A starting method, 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 in a motor vehicle with a holding device for holding the motor vehicle by means of an electric motor of the holding device in a holding and starting situation. Here, the holding and starting situation includes releasing the holding function from a held position and starting the motor vehicle with an acceleration movement. The control method comprises the following in the holding and starting situation: a) When setting the holding function, detecting an effective point of the locking device via the electric motor; b) Capturing an input to generate a drive torque for starting the motor vehicle; and c) Operating the electric motor to release the holding function and, with respect to (or based on) the detected point of action, to adjust the starting movement depending on the holding and starting situation, and/or operating the electric motor to release the holding function and to control the drive torque with respect to (or based on) the detected point of action to adjust the starting movement depending on the holding and starting situation. One advantage of this control method is that the acceleration motion can be adjusted (influenced or optimized) with regard to driving comfort. For example, a sudden jolt from starting can be minimized by adjusting the operation of the electric motor during acceleration. Alternatively, or in addition to adjusting the operation of the electric motor, the drive torque can be regulated accordingly. Adjusting (influencing or optimizing) the acceleration motion is carried out depending on the stopping and starting situation. This can increase driving comfort and/or safety. In this context, a locking device can be understood to mean, for example, an electric parking brake that incorporates an electric motor. The electric motor of the parking brake can, for instance, be designed to drive an actuator of the parking brake, which can mechanically lock the holding function. The effect The point of action is designed to indicate the effect of the electric motor, preferably when the holding function or holding effect is achieved by the electric motor. The point of action can be determined as a contact point during a locking process, for example, a point where one or more brake pads of the vehicle contact a brake disc. The point determined during the locking process is also used for the release process. For example, an actuator of an electric parking brake can mechanically move brake pads to lock and release them. It is preferred that the stopping and starting situation includes: c1) a tendency to stop and start with respect to the starting movement, in particular a gradient in the direction of the starting movement; and/or c2) a settin