Method for controlling an automatic transmission

Patent metadata

Field	Value
Publication number	US-9528599-B2
Application number	US-201514687313-A
Country	US
Kind code	B2
Filing date	Apr 15, 2015
Priority date	Apr 16, 2014
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A method and electronic control unit are provided for controlling an automatic transmission by way of the electronic control unit in a motor vehicle during a skidding turn, during which the motor vehicle first travels straight with a velocity above a predefined threshold value or within a predefined range with the reverse gearspeed engaged and, subsequently, experiences a defined steering jolt, by means of which a rotational movement is initiated. When a defined rotational angle is exceeded, the automatic transmission is automatically shifted from the reverse gearspeed into a neutral position.

First claim

What is claimed is:

1. A method for controlling an automatic transmission in a motor vehicle during a skidding turn, the method comprising the acts of:
determining, via an electronic control unit of the motor vehicle, that the motor vehicle is traveling straight in a reverse gear speed with a velocity above a predefined threshold value or within a predefined range;
determining, subsequently, via the electronic control unit, a defined steering jolt of the motor vehicle by which a rotational movement is initiated; and
when a defined rotational angle of the motor vehicle is exceeded, automatically shifting, via the electronic control unit, the automatic transmission from the reverse gear speed into a neutral position.

2. The method according to claim 1 , further comprising the act of:
detecting an end of the rotational movement of the motor vehicle; and
automatically shifting, via the electronic control unit, the automatic transmission from the neutral position into a forward travel position.

3. An electronic control unit for an automatic transmission of a motor vehicle, comprising:
a computer readable memory of the electronic control unit, the computer readable memory having stored thereon program code that:
determines that the motor vehicle is traveling straight in a reverse gear speed with a velocity above a predefined threshold value or within a predefined range;
determines, subsequently, a defined steering jolt of the motor vehicle by which a rotational movement is initiated; and
when a defined rotational angle of the motor vehicle is exceeded, automatically shifts the automatic transmission from the reverse gear speed into a neutral position.

4. The electronic control unit according to claim 3 , wherein the computer readable memory of the electronic control unit further comprises program code that:
detects an end of the rotational movement of the motor vehicle; and
automatically shifts the automatic transmission from the neutral position into a forward travel position.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Fischer Norbert

Classifications

• F16H61/16

  Inhibiting  {or initiating}  shift during unfavourable conditions  {, e.g. preventing forward-reverse shift at high vehicle speed, preventing engine overspeed}   (F16H61/18 takes precedence) · CPC title

• F16H2061/168

  Forced shifts into neutral for safety reasons, e.g. in case of transmission failure or emergency braking · CPC title

• F16H2061/0234

  Adapting the ratios to special vehicle conditions · CPC title

• F16H59/58 Primary

  dependent on signals from the steering · CPC title