The present disclosure relates to a controllable hydrodynamic retarder system (10) for a transmission including an electronic controller unit (ECU) (38) for selecting and controlling brake torque by adjusting a retarder outlet pressure. The system can include an algorithm to calculate a retarder outlet pressure set point or tables or brake torque curves or profiles to allow the ECU (38) to calculate or look up the functional relationships between the retarder RT outlet pressure, a vehicle or rotor speed, and a brake torque curve selected by the operator to provide the selected RT outlet pressure. The systems disclosed can nonetheless also include a cooling system or utilize a vehicles engine cooling system. In one embodiment, the cooler (32) can be shared between a transmission and the controllable retarder (27) and can be adjusted to accommodate cooling requirements. The ECU (38) can also make adjustments to the RT outlet pressure to address short term and long term RT overheating protection independent of the cooling system. The ECU (38) can be programmed to avoid selecting an RT outlet pressure set point that could lead to rapid overheating of the system. The proportionally controlled RT systems disclosed herein can also address long-term overheating by further applying an overheating correction factor to the RT outlet pressure set point.
Hydrodynamic retarder system and method of controlling a hydrodynamic retarder system
2019-10-17
Patent
Electronic Resource
English
IPC: | B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF |
HYDRODYNAMIC RETARDER SYSTEM AND METHOD OF CONTROLLING A HYDRODYNAMIC RETARDER SYSTEM
European Patent Office | 2020
|Hydrodynamic retarder system and method of controlling a hydrodynamic retarder system
European Patent Office | 2022
|HYDRODYNAMIC RETARDER SYSTEM AND METHOD OF CONTROLLING A HYDRODYNAMIC RETARDER SYSTEM
European Patent Office | 2020
|HYDRODYNAMIC RETARDER SYSTEM AND METHOD OF CONTROLLING A HYDRODYNAMIC RETARDER SYSTEM
European Patent Office | 2018
|