Traction aid function for vehicles having multiple driven axles

Patent metadata

Field	Value
Publication number	US-9308903-B2
Application number	US-201113816440-A
Country	US
Kind code	B2
Filing date	Jul 11, 2011
Priority date	Aug 11, 2010
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A method for transferring the drive torque from the wheels having a low traction to the wheels having a higher traction, the method being configured for vehicles in which not all driven wheels are equipped with a rotational speed sensor. In order to be able to perform a starting aid function, it is provided to measure the rotational speed of the cardan shaft and to put it in relation to the wheel rotational speed of at least one wheel which has a rotational speed sensor. If the deviation between the cardan shaft rotational speed and the measured wheel rotational speed is too high, at least one of the wheels, which does not have a rotational speed sensor, is braked automatically so that the vehicle is able to start.

First claim

What is claimed is:

1. A method for transferring a drive torque from wheels having a low traction to wheels having a higher traction for a vehicle having multiple driven axles, in which several but not all driven wheels are equipped with a rotational speed sensor, the method comprising:
measuring, with a cardan shaft sensor, a rotational speed of a cardan shaft;
measuring, with a rotational speed sensor, a wheel rotational speed of at least one wheel equipped with the rotational speed sensor;
comparing, with a control unit, the rotational speed of the cardan shaft to the wheel rotational speed of the at least one wheel equipped with the rotational speed sensor; and
upon determining that the deviation between the cardan shaft rotational speed and the wheel rotational speed is too high, automatically triggering a braking process, with the control unit, at at least one wheel that does not have a rotational speed sensor,
wherein in the case of a vehicle which has at least two rear axles and in which the wheels of one rear axle do not have rotational speed sensors, at least the wheels of the rear axle without rotational speed sensors are braked automatically.

2. A method for transferring a drive torque from wheels having a low traction to wheels having a higher traction for a vehicle having multiple driven axles, in which several but not all driven wheels are equipped with a rotational speed sensor, the method comprising:
measuring, with a cardan shaft sensor, a rotational speed of a cardan shaft;
measuring, with a rotational speed sensor, a wheel rotational speed of at least one wheel equipped with the rotational speed sensor;
comparing, with a control unit, the rotational speed of the cardan shaft to the wheel rotational speed of the at least one wheel equipped with the rotational speed sensor; and
upon determining that the deviation between the cardan shaft rotational speed and the wheel rotational speed is too high, automatically triggering a braking process, with the control unit, at at least one wheel that does not have a rotational speed sensor,
wherein in the case of a vehicle which has at least two rear axles and in which at least one wheel at each of the multiple rear axles does not have a rotational speed sensor, all wheels of the associated rear axles are braked so that the drive torque is transferred from these wheels to the front wheels.

Assignees

• Bieniek Lars
• Dieterich Frank
• Schmidt Michael Frank
• Bosch Gmbh Robert

Inventors

• Bieniek Lars
• Dieterich Frank
• Schmidt Michael Frank

Classifications

• B60T8/26

  characterised by producing differential braking between front and rear wheels {(using electrical circuitry or regulation means B60T8/17)} · CPC title

• B60T8/3205

  acceleration (B60T8/34, B60T8/52, B60T8/54, B60T8/56, B60T8/58, B60T8/72, B60T8/86, B60T8/88 take precedence) · CPC title

• B60T8/349

  Systems adapted to control a set of axles, e.g. tandem axles · CPC title

• B60T8/32

  responsive to a speed condition, e.g. acceleration or deceleration ({using electrical circuitry or regulation means B60T8/17} ; B60T8/28 takes precedence; electric devices on electrically propelled vehicles indicating the wheel slip B60L3/10; measuring linear or angular speed per se G01P3/00) · CPC title

• B60W2510/104

  Output speed · CPC title