Hydraulic retarder

Abstract

The utility model relates to a hydrodynamic retarder, which relates to the technical field of vehicles, and is characterized in that an input gear pair of the hydrodynamic retarder is arranged on an input shaft of a transmission, so that the hydrodynamic retarder can operate even in a neutral gear. According to the utility model, the position of the input gear of the retarder is changed, so that the retarder can be manually controlled to work when the whole vehicle is idling, and the water temperature of an engine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a hydraulic retarder and a control scheme. Background Art

[0002] At present, the hydraulic retarder for heavy commercial vehicles is usually installed on the rear side of the transmission, and its input gear is connected to the output shaft of the transmission, as shown in the schematic diagram. Figure 1 The input speed of the hydraulic retarder is in direct proportion to the vehicle speed. When the vehicle is idling, the transmission gear is in neutral and the hydraulic retarder does not work.

[0003] The cooling water circuit of the hydraulic retarder is established on the engine small circulation route and connected in parallel with the heating system. Figure 2 .

[0004] When the engine is started, the coolant in the retarder oil cooler runs in a small cycle in the engine driven by the water pump. When the water temperature rises and the thermostat opens, it runs in a mixed cycle or a large cycle depending on the degree of thermostat opening.

[0005] Under the existing technical solution, the retarder oil cooler will release heat to the cooling medium only when the retarder is used for driving braking, and this part of heat can only be released through the vehicle radiator for cooling and cannot be used.

[0006] Under the existing technical solution, when the whole vehicle is heated in situ in winter, the heat dissipation of the heater core all comes from the heat generated when the engine is idling. When the temperature is low or the heat generated by the engine at idle is low, the heating effect is poor. Utility Model Content

[0007] The utility model aims to provide a hydraulic retarder to reduce the warm-up time of a whole vehicle and improve the warm-up effect of the whole vehicle.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a hydraulic retarder, and the input gear pair of the hydraulic retarder is installed on the input shaft of the transmission, so that the hydraulic retarder can operate even in neutral gear.

[0009] Preferably, the controller of the hydraulic retarder can integrate and execute control methods for in situ vehicle heating and warm air heating.

[0010] Preferably, when the hydraulic retarder is turned on, the controller of the hydraulic retarder determines whether to enter the hot car heating mode or the conventional driving braking mode according to the vehicle speed and the transmission gear position. If the vehicle speed is equal to 0 and the transmission gear position is neutral, the hydraulic retarder enters the hot car / heating mode, otherwise it enters the conventional driving braking mode;

[0011] In the hot car / heating mode, only one gear is set, and no matter which gear the hydraulic retarder switch is placed in, the controller only executes one control strategy;

[0012] The controller collects water temperature signals. When the water temperature is lower than the set temperature T, the hydraulic retarder works with a preset braking force. The controller communicates with the ECU to increase the engine fuel injection amount and control the engine speed to maintain it at 900r / min. When the water temperature reaches the set temperature T, the hydraulic retarder stops working and reminds the driver to turn off the hydraulic retarder.

[0013] In summary, the utility model includes the following beneficial technical effects:

[0014] 1. Reduce the warm-up time of the vehicle.

[0015] 2. Improve the heating effect of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a connection diagram of the existing hydraulic retarder;

[0017] Figure 2 This is a schematic diagram of the existing vehicle cooling and heating system;

[0018] Figure 3 This is a schematic diagram of the connection of the hydraulic retarder of the utility model;

[0019] Figure 4 This is a schematic diagram of the control scheme of the hydraulic retarder of the utility model.

[0020] Reference numerals: 1. hydraulic retarder; 2. retarder gear; 3. input shaft; 4. output shaft. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The embodiment of the utility model discloses a hydraulic retarder, wherein the input gear pair of the hydraulic retarder 1 is mounted on the input shaft 3 of the transmission, so that the hydraulic retarder 1 can operate even when the gear is in neutral. Furthermore, a control scheme for on-site warm-up and warm-air heating is integrated in the controller of the hydraulic retarder 1, and the vehicle idle mode or warm-up heating mode is judged according to the vehicle speed and gear state; the working state of the hydraulic retarder 1, the engine speed and the injection amount are controlled with the preset temperature T as the threshold.

[0023] Install the hydraulic retarder 1 input gear pair on the transmission input shaft 3, as shown in Figure 3 .

[0024] Add a set of control schemes for in-situ heating and warm air heating to the retarder controller. The control scheme is as follows: Figure 4 .

[0025] When the driver turns on the retarder switch, the retarder controller determines whether to enter the warm-up mode or the conventional driving braking mode according to the vehicle speed and transmission gear position. If the vehicle speed is equal to 0 and the transmission gear position is neutral, the retarder enters the warm-up mode, otherwise it enters the conventional driving braking mode.

[0026] In the hot car heating mode, only one gear is set. No matter which gear the retarder switch is in, the retarder controller only executes one control strategy. The retarder controller collects the water temperature signal from the water temperature sensor. When the water temperature is lower than the set temperature T, the retarder works with the preset braking force. The retarder controller communicates with the ECU to increase the engine injection amount and control the engine speed to keep it at 900r / min. When the water temperature reaches the set temperature T, the retarder stops working and reminds the driver to turn off the retarder switch.

[0027] The utility model changes the position of the retarder input gear, so that the retarder can be operated under artificial control when the whole vehicle is idling, thereby increasing the engine water temperature.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic retarder, characterized in that: The input gear pair of the hydraulic retarder (1) is mounted on the input shaft (3) of the transmission, so that the hydraulic retarder (1) can operate even when in neutral gear.

2. A hydraulic retarder according to claim 1, characterized in that: The controller of the hydraulic retarder (1) can integrate and execute control methods for in-situ vehicle heating and warm air heating.

3. A hydraulic retarder according to claim 2, characterized in that: When the hydraulic retarder (1) is turned on, the controller of the hydraulic retarder (1) determines whether to enter a hot car heating mode or a conventional driving braking mode according to the vehicle speed and the transmission gear position. If the vehicle speed is equal to 0 and the transmission gear position is neutral, the hydraulic retarder (1) enters a hot car / heating mode, otherwise it enters a conventional driving braking mode. In the hot car / heating mode, only one gear is provided, and no matter which gear the hydraulic retarder (1) switch is placed in, the controller only executes one control strategy; The controller collects a water temperature signal. When the water temperature is lower than a set temperature T, the hydraulic retarder (1) works with a preset braking force. The controller communicates with the ECU to increase the amount of fuel injected into the engine and control the engine speed to maintain it at 900 r / min. When the water temperature reaches the set temperature T, the hydraulic retarder (1) stops working and reminds the driver to turn off the hydraulic retarder (1).

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