DOWNHILL SPEED CONTROL TARGET ADAPTATION BASED ON ENGINE RETARDER DEMAND

摘要

A vehicle computer system controls downhill speed of a vehicle having a cruisecontrol system and an engine retarder system. The system receives a request toincreaseengine retarder demand. In response, the system increases an engine retarderdemandsetting and, if cruise control is active, decreases a downhill speed control(DSC) cruisecontrol offset. The engine retarder system may automatically activate toreduce thevehicle speed to a cruise control set speed plus the DSC cruise controloffset. In anembodiment, the request to increase engine retarder demand is generated inresponse tooperator input via an engine retarder demand input device (e.g., asteering-column-mounted control stalk). The system may also receive a requestto decrease engineretarder demand in the engine retarder system of the vehicle. In response, thesystemdecreases the engine retarder demand setting and, if cruise control is active,increases theDSC cruise control offset.