Hydrodynamic retarder system and method of controlling hydrodynamic retarder system
A technology of hydraulic reducer and reducer, applied in the field of hydraulic transmission and proportional controllable reducer system, integrated hydraulic transmission and reducer system, can solve the problems of narrow tolerance and cannot be easily changed, and achieve high Effects of degrees of freedom
Active Publication Date: 2020-03-17
DANA BELGIUM
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Problems solved by technology
As a result, these components have narrow tolerances and cannot be easily changed without affecting the flow rate and thus the cooling function
In fact, in many cases the limited ability to change components and thus flow rates may be the reason for integrating heat exchangers into reducer systems
Method used
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[0056] It should be understood that the invention may employ various alternative components, orientations and configurations unless expressly indicated to the contrary. It should also be understood that the specific devices and processes shown in the drawings and described in the specification are merely exemplary embodiments of the inventive concepts disclosed and defined herein. Thus, specific dimensions, orientations or other physical characteristics relating to the various embodiments disclosed herein are not to be considered limiting unless expressly stated otherwise.
[0057] figure 1 One embodiment of a hydrodynamic transmission with a controllable or proportional reducer system 10 is shown. In this embodiment, the system 10 may have two pumps, an RT pump 16 for supplying fluid flow to the retarder circuit and a transmission (TM) pump 14 for supplying fluid flow to the transmission. In another embodiment, system 10 may have a single fluid pump for supplying fluid to p...
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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.
Description
technical field [0001] The present disclosure generally relates to vehicle brake assistance referred to as retarder systems and methods. In particular, the systems and methods relate to hydraulic retarders, and more particularly to integrated hydraulic transmission and retarder systems. More specifically, the systems and methods disclosed herein relate to integrated hydraulic transmission and proportional controllable retarder systems. Background technique [0002] In fluid transmissions, especially those used in motor vehicles, a speed reducer may be connected directly or indirectly to the transmission input or output shaft or any other drive shaft to assist by slowing down the rotation of the drive shaft For example the braking of a motor vehicle incorporating a transmission. The reducer can take advantage of the friction and shock losses of the movable blades or impellers of the rotor connected to the drive shaft and the fixed blades or impellers of the stator connected...
Claims
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IPC IPC(8): B60T1/087
CPCB60T1/087B60T5/00F16H57/0467B60T2201/03B60Y2306/03B60T10/02F01P3/20F16D57/02
Inventor J·范丁格恩J·A·贝德特H·涅维汉
Owner DANA BELGIUM