CN104512419B - Method for influencing the creep torque of a car during a stationary state of the car - Google Patents

Abstract

A method of for influencing the wriggling torque of automobile during vehicle stationary state, wherein-check whether automobile remains static；The braking moment independently of driver is set up by its service braking system or parking braking system in the case where stationary state；Reduce or reduce wriggling torque after setting up brake force.

Description

Method for influencing the creep torque of a car during a stationary state of the car

Background technique

Known automatic transmissions or dual clutch transmissions generate a creeper moment or creep moment in order to provide the driver with more comfort, in particular, the vehicle does not reverse the wheels on gentle uphill grades.

Energy is required to generate this creeping or creeping torque, which is reflected in increased fuel consumption of internal combustion engines or a reduction in the maximum driving range of electric or hybrid vehicles.

SUMMARY OF THE INVENTION

The invention relates to a method for influencing the creep torque of a motor vehicle during a stationary state of the motor vehicle, wherein,

- check whether the car is stationary, especially when the engine is running or ready to drive;

- builds up a driver-independent braking torque with its service or parking brake system at standstill;

- Reduce or reduce the creep torque after the braking force is built up.

As a result, energy savings can be achieved when the vehicle is in operation. It does not matter here whether the creep torque is generated by the transmission, in particular an automatic transmission or a dual-clutch transmission, or by the electric motor.

An advantageous configuration of the invention is characterized in that the braking force is reduced independently of the driver and the creep torque is increased again after the driver's desire to start has been detected. This in turn produces a habitual driving feeling for the driver.

An advantageous configuration of the invention is characterized in that a start request is detected as the presence of the driver when the accelerator pedal is actuated.

An advantageous configuration of the invention is characterized in that the vehicle is a transmission vehicle with an automatic transmission or a dual clutch transmission, the creep torque being provided by the transmission.

The invention also covers an apparatus having a mechanism specially designed to carry out the method of the invention. The mechanism is in particular a controller, in which the program code for implementing the method of the invention is stored.

Description of drawings

The drawings include FIG. 1 .

FIG. 1 shows the principle flow of a design of the method of the present invention.

Detailed ways

The vehicle is automatically parked by means of the service brake or the automatic parking brake, whereby the energy consumption for generating the creep or creep torque of the transmission can be reduced in the standstill state. Even electric vehicles are often provided with a creeping torque in order to improve the driving comfort of the driver, the generation and maintenance of which involves an increase in energy consumption.

The flow of a design of the method of the invention is shown in FIG. 1 . After the method starts at block 100 , it is queried at block 101 whether the vehicle is stationary. If this is not the case, go back to the block 101 entry. If this is the case, however, then in block 102 a braking intervention is then requested independently of the driver, eg via the driving dynamics control system or the parking brake system. Next, in block 103 it is asked whether there is a positiv feedback for the braking system activated in block 102 . This feedback is, in particular, the feedback signal, which signals that the brake has been actuated. If there is no such feedback, go back to the block 101 entry. However, if such feedback is present, ie the vehicle is braked independently of the driver, the creep or creep torque of the vehicle is deactivated in block 104 . In block 105 it is queried whether there is a driver's desire to start. If this is not the case, go back to the block 105 entry. If, however, there is a desire to start, which is detected, for example, by the driver's actuation of the gas pedal, then in block 106 the driver-independent braking intervention of block 102 is canceled and the creeping or creeping of the vehicle is activated again. moment. The method ends in block 107 .

Claims (5)

1. a kind of for influencing the method for the wriggling torque of automobile during vehicle stationary state, wherein

Check whether automobile remains static (101)；

It is set up by its service braking system or parking braking system independently of driver in the case where stationary state Braking moment (102)；And

Wriggling torque (104) are reduced after setting up brake force.

2. the method as described in claim 1, which is characterized in that after detecting the starting hope (105) of driver, Reduce brake force independently of driver, and improves wriggling torque (106) again.

3. method according to claim 2, which is characterized in that will start hope detection when driver touches travel board is In the presence of (106).

4. the method as described in claim 1, which is characterized in that the automobile be it is a kind of with automatic shift transmission or it is double from The transmission vehicle of clutch speed changer, and torque of wriggling is provided by speed changer.

5. it is a kind of for influencing the device of the wriggling torque of automobile during vehicle stationary state, have and is specially designed to reality Apply the mechanism of method according to any one of claims 1 to 4.