CN212642884U - Auxiliary braking system for vehicle electric control fan - Google Patents
Auxiliary braking system for vehicle electric control fan Download PDFInfo
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- CN212642884U CN212642884U CN202020497251.6U CN202020497251U CN212642884U CN 212642884 U CN212642884 U CN 212642884U CN 202020497251 U CN202020497251 U CN 202020497251U CN 212642884 U CN212642884 U CN 212642884U
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- 238000004891 communication Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 238000011217 control strategy Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
The utility model relates to an automobile engine auxiliary brake technical field. The utility model provides a vehicle electric control fan auxiliary brake system, which comprises an electric control fan, an engine and an engine ECU, wherein the electric control fan comprises a fan and a fan clutch, the engine drives the fan to rotate through the fan clutch, and the engine ECU controls the meshing proportion of the fan clutch; the engine ECU is in signal connection with the whole vehicle VCU, when the whole vehicle VCU recognizes that the whole vehicle enters a braking operation, a braking signal is sent to the engine ECU, the engine ECU receives the braking signal and then controls the fan clutch to enter a full-meshing state, and the fan rotates at full speed; because the rotation of the fan needs to overcome air resistance, the fan can drag the crankshaft of the engine reversely to realize auxiliary braking. The auxiliary braking of the engine can be realized based on the control strategy of the engine electric control fan under the condition that the existing power assembly is not changed.
Description
Technical Field
The utility model relates to an automobile engine auxiliary brake technical field, concretely relates to automatically controlled fan auxiliary brake system of vehicle is particularly useful for commercial automobile.
Background
The auxiliary braking mode in the field of commercial vehicles at present mainly comprises an exhaust braking technology, an all-purpose braking technology, a retarder auxiliary braking technology and the like, and the respective technical characteristics are as follows:
the exhaust braking technology comprises the following steps: the butterfly valve installed on the exhaust pipe closes the exhaust path of the supercharger in the braking process of the whole automobile, so that the resistance of the engine piston in the exhaust stage is increased, the piston reversely drags the engine crankshaft, and finally the aim of decelerating the whole automobile is achieved, and the braking power of the butterfly valve is about 88kW, for example, the WP10 engine of Weichai diesel engine company. The technical characteristics are as follows: the braking power is small, and the maintenance cost is low.
All can be realized by the following steps: based on the principle of compression-evacuation-compression-evacuation in the working stroke of the piston, the piston does negative work in the whole working process of four strokes, the crankshaft of the engine is reversely dragged to rotate, and finally the purpose of speed reduction of the whole vehicle is achieved, wherein the maximum braking power of the engine is about 235kW, for example, an ISM engine of the Xian Cummins company. The technical characteristics are as follows: the braking power is large and the cost is high.
The retarder braking technology comprises the following steps: the rotating resistance among the stator, the rotor and the cavity oil is utilized to reversely drag the automobile transmission shaft, the technology of reducing the speed of the whole automobile is realized, the braking power of the technology is about 250kW, for example, an FHB400 retarder of Shaanxi Franst company. The technical characteristics are as follows: the brake power is large, the cost is high, and the whole vehicle is difficult to arrange.
The improvement of the auxiliary braking power can improve the running safety of the whole automobile, reduce the maintenance cost of the whole automobile and the like, and how to improve the auxiliary braking power in the automobile braking process becomes the main research direction of each main engine plant. The creators of the utility model finally obtain the utility model through long-time research and practice.
SUMMERY OF THE UTILITY MODEL
The utility model provides an auxiliary brake system of automatically controlled fan of vehicle, it can be under the unchangeable circumstances of current power assembly, based on the control strategy of the automatically controlled fan of engine, realizes the auxiliary brake of engine.
The utility model discloses a technical scheme lie in:
the auxiliary braking system comprises an electronic control fan, an engine and an engine ECU (electronic control Unit), wherein the electronic control fan comprises a fan and a fan clutch, the engine drives the fan to rotate through the fan clutch, and the engine ECU controls the engagement ratio of the fan clutch;
the engine ECU is in signal connection with a vehicle VCU,
when the VCU of the whole vehicle recognizes that the whole vehicle enters a braking operation, a braking signal is sent to the engine ECU, the engine ECU receives the braking signal and then controls the fan clutch to enter a full-meshing state, and the fan rotates at full speed;
because the rotation of the fan needs to overcome air resistance, the fan can drag the crankshaft of the engine reversely to realize auxiliary braking.
Further, the vehicle is a commercial automobile.
Further, the electric control fan is an electric control silicone oil fan.
Furthermore, the engine ECU also calibrates the engagement proportion of the fan clutch according to the outlet water temperature of the engine, the inlet air temperature of the engine and an air conditioner switch of a cab.
Further, the engine ECU also calibrates the engagement ratio of the fan clutch according to a retarder switch.
Illustratively, the engine ECU is connected with the VCU of the whole vehicle through a CAN communication bus.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional vehicle powertrain;
FIG. 2 is a schematic diagram of an electric fan control system of a current commercial vehicle;
fig. 3 is a schematic diagram of an electric fan auxiliary braking system for a vehicle according to an embodiment of the present invention.
Detailed Description
The above and further features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1, at present, a power assembly of a commercial vehicle mainly comprises an engine 104, a transmission 103, a transmission shaft 102, a rear axle 101 and the like, wherein power in the running process of the whole vehicle is generated by in-cylinder combustion of the engine 104, and a crankshaft rotates to drive the rear axle 101 of the vehicle to rotate through speed reduction and torque increase of the transmission 103, so that the whole vehicle can advance. During the forward travel of the vehicle, a portion of the engine combustion heat needs to be carried away by the coolant and then dissipated to the atmosphere by suction fan 105.
As shown in fig. 2, the engagement ratio of the clutch is controlled by the engine ECU of the current commercial vehicle, and the engine ECU calibrates the engagement ratio of the fan clutch according to the outlet water temperature of the engine, the inlet air temperature of the engine, the air conditioner switch of the cab and the retarder switch (optional). During the braking process of the whole vehicle, the engine stops injecting oil, the kinetic energy during the deceleration process of the whole vehicle is mainly consumed by the wheel edge brake heating, and part of the kinetic energy is consumed by the idle friction of the drive axle, the transmission shaft, the speed changer and the engine. In the process, because the engine is in the non-oil injection rotation process, the heat in the cylinder is quickly taken away, and according to the electric control fan control system of the current commercial vehicle, the fan is in a separation or follow-up state due to the outlet water temperature and the inlet air temperature.
As shown in fig. 3, in the present embodiment, an electronic control fan auxiliary braking system for a vehicle is provided, which includes an electronic control fan, an engine, and an engine ECU, where the electronic control fan includes a fan and a fan clutch, the engine drives the fan to rotate through the fan clutch, and the engine ECU controls the engagement ratio of the fan clutch; the engine ECU is in signal connection with the whole vehicle VCU, when the whole vehicle VCU recognizes that the whole vehicle enters a braking operation, a braking signal is sent to the engine ECU, the engine ECU receives the braking signal and then controls the fan clutch to enter a full-meshing state, and the fan rotates at full speed; because the rotation of the fan needs to overcome air resistance, the fan can drag the crankshaft of the engine reversely to realize auxiliary braking.
The system is particularly suitable for commercial vehicles, and the auxiliary braking function can be realized without adding an external structure on the power assembly of the conventional commercial vehicle. However, the system is not limited to be used in commercial vehicles, the engine of the vehicle directly drives the electric control fan, and the fan rotates to reversely drag the crankshaft of the engine, so that the system can be applied to the invention.
Illustratively, the engine ECU is connected with the VCU of the whole vehicle through a CAN communication bus.
It can be understood, the utility model discloses increase "braking operation and trigger" among the auxiliary braking system to automatically controlled fan, when whole car VCU discernment whole car gets into the braking operation, engine ECU control fan gets into the full mesh state, and fan full speed rotates this moment, because the fan rotates and need overcome air resistance, so the rotatory fan of full speed can reverse drag the engine crankshaft, and the kinetic energy of the whole car speed reduction in-process of final consumption (the kinetic energy of different fan consumptions is different), realizes the auxiliary braking purpose of fan.
In one specific example, the vehicle electronic control fan auxiliary brake system specifically adopts an Weichai WP13 engine matched with an electronic control silicone oil fan with the diameter of 750mm, the power point rotating speed is 1900 rpm, the fan speed ratio is 1.218, the power point fan rotating speed is 2314 rpm, and the fan power consumption is about 40 kW.
The foregoing is merely a preferred embodiment of the invention, which is intended to be illustrative, not limiting. The utility model discloses in all can change to some extent structure and connected mode etc. of each part all be in the utility model discloses equal transform and the improvement of going on technical scheme's the basis all should not get rid of the utility model discloses an outside the protection scope.
Claims (6)
1. An auxiliary braking system of an electric control fan of a vehicle comprises the electric control fan, an engine and an engine ECU, wherein the electric control fan comprises the fan and a fan clutch, the engine drives the fan to rotate through the fan clutch, and the engine ECU controls the engagement ratio of the fan clutch;
it is characterized in that the engine ECU is in signal connection with the VCU of the whole vehicle,
the vehicle VCU is used for sending a braking signal to the engine ECU when the vehicle enters into braking operation;
the engine ECU is used for controlling the fan clutch to enter a full-meshing state after receiving a braking signal;
because the rotation of the fan needs to overcome air resistance, the fan can drag the crankshaft of the engine reversely to realize auxiliary braking.
2. An electrically controlled fan assisted brake system for vehicles according to claim 1, wherein the vehicle is a commercial vehicle.
3. An electrically controlled fan assisted brake system for vehicles according to claim 1, wherein the electrically controlled fan is an electrically controlled silicone oil fan.
4. An electronically controlled fan assisted brake system for a vehicle according to claim 1, wherein the engine ECU further calibrates the engagement ratio of the fan clutch based on engine out water temperature, engine in air temperature, and a driver's cabin air conditioner switch.
5. An electronically controlled fan assisted brake system for a vehicle according to claim 4, wherein the engine ECU further calibrates the fan clutch engagement ratio based on a retarder switch.
6. An electrically controlled fan assisted brake system according to claim 1, wherein the engine ECU is connected to the vehicle VCU via a CAN communication bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020497251.6U CN212642884U (en) | 2020-04-08 | 2020-04-08 | Auxiliary braking system for vehicle electric control fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020497251.6U CN212642884U (en) | 2020-04-08 | 2020-04-08 | Auxiliary braking system for vehicle electric control fan |
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| CN212642884U true CN212642884U (en) | 2021-03-02 |
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| CN202020497251.6U Active CN212642884U (en) | 2020-04-08 | 2020-04-08 | Auxiliary braking system for vehicle electric control fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494372A (en) * | 2020-04-08 | 2021-10-12 | 陕西重型汽车有限公司 | Auxiliary braking system and auxiliary braking method for vehicle electric control fan |
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- 2020-04-08 CN CN202020497251.6U patent/CN212642884U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494372A (en) * | 2020-04-08 | 2021-10-12 | 陕西重型汽车有限公司 | Auxiliary braking system and auxiliary braking method for vehicle electric control fan |
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