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HAPTIC ALERT FOR OVERHEATED RETARDER

IP.com Disclosure Number: IPCOM000247979D
Publication Date: 2016-Oct-14
Document File: 3 page(s) / 62K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present solution relates to a system and a method for alerting the driver of a vehicle that a retarder is about to be overheated. By controlling the braking torque provided by the retarder, such that it is pulsed before a critical temperature has been reached, a haptic alert is achieved. The driver of the vehicle will thereby become aware of the problem without visual or audial input and the driver can instead focus on the traffic and on operating the vehicle in a safe way.

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HAPTIC ALERT FOR OVERHEATED RETARDER

ABSTRACT

The present solution relates to a system and a method for alerting the driver of a vehicle that a retarder is about to be overheated. By controlling the braking torque provided by the retarder, such that it is pulsed before a critical temperature has been reached, a haptic alert is achieved. The driver of the vehicle will thereby become aware of the problem without visual or audial input and the driver can instead focus on the traffic and on operating the vehicle in a safe way.

BACKGROUND

A hydraulic retarder typically comprises dynamic and static vanes in a chamber filled with a fluid, such as oil or water. The vanes are connected to the output shaft of a transmission, for example via gears. The fluid induces viscous drag forces between the vanes and a braking torque is thereby applied on the output shaft. Retardation of the vehicle is thus achieved. The braking torque and thus the retardation can be controlled by controlling the amount of fluid in the chamber. A larger amount of fluid in the chamber will increase the retardation.

The retarder fluid in the chamber is circulated through a heat exchanger such that it is cooled by a cooling fluid. However, the retarder fluid and/or the cooling fluid may be overheated if the retarder is heavily used. A too high temperature of the retarder fluid may cause it to ignite or it may damage the various components of the retarder system. In order to avoid such problems the amount of fluid in the chamber may be reduced when the temperature of the retarder fluid or the temperature of the cooling fluid reaches a respective critical temperature. This way, the viscous drag in the chamber is reduced, which will lower the temperature of the retarder fluid. However, when the amount of fluid in the chamber is reduced the retardation is also reduced and this may be perceived by the driver as if the vehicle is accelerating instead of decelerating. This might startle the driver and the safety may be compromised. It would thus be advantageous to alert the driver such that the driver is prepared when the retardation is reduced.

TECHNICAL SOLUTION

The present solution relates to a system and a method for providing a haptic alert when a retarder...