阅读说明：本技术 具备液压式制动能及怠速能量回收利用动力系统的车辆 (Vehicle with hydraulic braking energy and idling energy recycling power system ) 是由 孙传文 徐锟 张有军 第少华 宋晓宇 于 2018-08-03 设计创作，主要内容包括：本发明提供一种具备液压式制动能及怠速能量回收利用动力系统的车辆,包括发动机、通过离合器与发动机相连接的变速箱、通过传动轴与变速箱相连接的减速器、与减速器相连接的驱动桥、及安装在驱动桥上的车轮,所述具备液压式制动能及怠速能量回收利用动力系统的车辆还包括液压泵/马达、与液压泵/马达相连接的第一蓄能器、及与液压泵/马达相连接的第二蓄能器,所述变速箱上安装有动力输出装置,所述液压泵/马达与动力输出装置相连接。本具备液压式制动能及怠速能量回收利用动力系统的车辆,能将制动能及怠速能量进行回收并利用,从而保证本车辆的能耗较低。(The invention provides a vehicle with a hydraulic braking energy and idling energy recycling power system, which comprises an engine, a gearbox connected with the engine through a clutch, a speed reducer connected with the gearbox through a transmission shaft, a drive axle connected with the speed reducer, wheels mounted on the drive axle, a hydraulic pump/motor, a first energy accumulator connected with the hydraulic pump/motor, and a second energy accumulator connected with the hydraulic pump/motor, wherein a power output device is mounted on the gearbox, and the hydraulic pump/motor is connected with the power output device. The vehicle with the hydraulic braking energy and idling energy recycling power system can recycle and utilize the braking energy and the idling energy, so that the energy consumption of the vehicle is low.)

1. The utility model provides a possess fluid pressure type braking energy and idle speed energy recuperation utilizes driving system's vehicle, includes engine (1), gearbox (3) that are connected with engine (1) through clutch (2), reduction gear (4) that are connected with gearbox (3) through transmission shaft (31), transaxle (5) that are connected with reduction gear (4), and wheel (6) of installing on transaxle (5), its characterized in that: the hydraulic pump/motor hybrid power system is characterized by further comprising a hydraulic pump/motor (71), a first energy accumulator (72) connected with the hydraulic pump/motor (71), and a second energy accumulator (73) connected with the hydraulic pump/motor (71), wherein a power output device (32) is mounted on the gearbox (3), and the hydraulic pump/motor (71) is connected with the power output device (32).

2. The vehicle with the hydraulic braking energy and idle energy recovery power system of claim 1, wherein: the hydraulic control system further comprises a first angular displacement sensor (741) installed on the brake pedal and a controller (75) used for controlling the displacement of the hydraulic pump/motor (71), wherein the first angular displacement sensor (741) is connected with the controller (75).

3. The vehicle with the hydraulic braking energy and idle energy recovery power system of claim 2, wherein: the energy storage device further comprises a pressure detection sensor (742) connected with the first energy storage device (72), and the pressure detection sensor (742) is connected with the controller (75).

4. The vehicle with the hydraulic braking energy and idle energy recovery power system of claim 2, wherein: the vehicle speed detection device is characterized by further comprising a vehicle speed detection sensor (743) connected with the controller (75) and an engine rotating speed detection sensor (744) connected with the controller (75), wherein the vehicle speed detection sensor (743) is used for detecting the running speed of a vehicle, and the engine rotating speed detection sensor (744) is used for detecting the rotating speed of the engine (1).

5. The vehicle with the hydraulic braking energy and idle energy recovery power system of claim 2, wherein: and a second angular displacement sensor (745) mounted on the accelerator pedal, the second angular displacement sensor (745) being connected to the controller (75).

6. The vehicle with the hydraulic braking energy and idle energy recovery power system of claim 2, wherein: also included is a valve block connected to the hydraulic pump/motor (71), the valve block being connected to a controller (75), and the valve block being connected to a first accumulator (72) and a second accumulator (73).

Technical Field

The present invention relates to a vehicle, and more particularly, to a vehicle having a hydraulic braking energy and idling energy recovery power system.

Background

The power of the common vehicle is provided by the engine independently, the working condition of the engine is completely determined by the road condition, once the vehicle needs to be accelerated, decelerated and suddenly stopped frequently, the load fluctuation is large, the working point of the engine also fluctuates greatly, and therefore the working point of the engine cannot be stabilized in a high-efficiency fuel area, the fuel efficiency is low, and the fuel consumption is increased. In addition, the braking energy and the idling energy of the ordinary vehicle are not recycled, so that the energy is dissipated in the form of heat energy, and the defects of system temperature rise and the like are caused. Therefore, under the condition that the structure of the original vehicle system is basically unchanged, a set of hydraulic hybrid power system with the energy recovery function is developed, so that the efficiency of the engine can be optimized, the fuel efficiency is improved, and the energy recovery, distribution and reutilization in the braking process and the idling process of the vehicle can be realized, thereby achieving the purpose of energy conservation.

At present, the application topological structure of the hydraulic hybrid power system on the vehicle mainly has three forms of series connection, parallel connection and series-parallel connection. The hydraulic pump/motor of the series system needs to provide all energy in the running process of the vehicle, and the required output power is large; the hydraulic pump/motor of the parallel system only needs to provide part of energy, and the required output power is small. The hydraulic pump/motor displacement of the series system is therefore greater than that of the parallel system; in addition, the tandem system requires a single hydraulic pump, which results in a large volume, a complex system and high cost. However, in the series system, the engine does not directly drive the load, but performs energy conversion through the hydraulic system, and indirectly drives the load, so that the fuel efficiency of the engine can be better optimized through the hydraulic system, and higher energy-saving efficiency can be achieved. Series systems are mainly used for light vehicles, while parallel systems are mainly used for heavy vehicles.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a vehicle with a hydraulic braking energy and idle energy recycling power system with low energy consumption.

In order to achieve the above object, the present invention provides a vehicle with a hydraulic braking energy and idle energy recycling power system, comprising an engine, a transmission connected with the engine through a clutch, a reducer connected with the transmission through a transmission shaft, a drive axle connected with the reducer, and wheels mounted on the drive axle, wherein the vehicle with the hydraulic braking energy and idle energy recycling power system further comprises a hydraulic pump/motor, a first energy accumulator connected with the hydraulic pump/motor, and a second energy accumulator connected with the hydraulic pump/motor, the transmission is mounted with a power output device, and the hydraulic pump/motor is connected with the power output device.

Furthermore, the vehicle with the hydraulic braking energy and idling energy recycling power system further comprises a first angular displacement sensor mounted on a brake pedal and a controller used for controlling the displacement of the hydraulic pump/motor, wherein the first angular displacement sensor is connected with the controller.

Furthermore, the vehicle with the hydraulic braking energy and idling energy recycling power system further comprises a pressure detection sensor connected with the first energy accumulator, and the pressure detection sensor is connected with the controller.

Further, the vehicle with the hydraulic braking energy and idling energy recycling power system further comprises a vehicle speed detection sensor connected with the controller and an engine rotating speed detection sensor connected with the controller, wherein the vehicle speed detection sensor is used for detecting the running speed of the vehicle, and the engine rotating speed detection sensor is used for detecting the rotating speed of the engine.

Furthermore, the vehicle with the hydraulic braking energy and idling energy recycling power system further comprises a second angular displacement sensor arranged on an accelerator pedal, and the second angular displacement sensor is connected with the controller.

Furthermore, the vehicle with the hydraulic braking energy and idling energy recycling power system further comprises a valve bank connected with the hydraulic pump/motor, the valve bank is connected with the controller, and the valve bank is connected with the first energy accumulator and the second energy accumulator.

As described above, the vehicle having the hydraulic braking energy and idling energy recovery and utilization power system according to the present invention has the following advantageous effects:

the working principle of the vehicle with the hydraulic braking energy and idling energy recycling power system is as follows: when the vehicle is in a braking working condition, the wheels drive the hydraulic pump/motor to act through the drive axle, the speed reducer, the transmission shaft, the gearbox and the power output device during rotation, at the moment, the hydraulic pump/motor is used as a pump, and hydraulic oil in the second energy accumulator flows into the first energy accumulator through the hydraulic pump/motor, so that kinetic energy, namely braking energy, of the vehicle during braking is converted into hydraulic energy to be stored in the first energy accumulator, and the wheels and the vehicle are braked, so that the direct waste of the part of kinetic energy, the temperature rise of the friction brake and the like caused when the wheels are braked only by the friction brake are avoided; when the vehicle is in an idling working condition, the running engine drives the hydraulic pump/motor to act through the gearbox and the power output device, at the moment, the hydraulic pump/motor is used as a pump, and hydraulic oil in the second energy accumulator flows into the first energy accumulator through the hydraulic pump/motor, so that mechanical energy output by the engine under the idling working condition, namely idling energy, is converted into hydraulic energy to be stored in the first energy accumulator, and the direct waste of the energy is avoided; when power is required to be provided to drive the wheels to rotate, hydraulic oil in the first energy accumulator flows into the second energy accumulator through the hydraulic pump/motor and drives the hydraulic pump/motor to act, at the moment, the hydraulic pump/motor is used as a motor and drives the gearbox to rotate through the power output device, and the gearbox drives the wheels to rotate through the transmission shaft, the speed reducer and the drive axle, so that the hydraulic energy stored in the first energy accumulator is released and converted into kinetic energy for vehicle running; and then the recovery and utilization of the braking energy and the idling energy are realized, and the energy consumption of the vehicle is low.

Drawings

Fig. 1 is a schematic structural diagram of a vehicle having a hydraulic braking energy and idle energy recycling power system according to the present invention.

Description of the element reference numerals

1 Engine 72 first accumulator

2 Clutch 73 second accumulator

3 first angular displacement sensor of gearbox 741

31 transmission shaft 742 pressure detection sensor

Vehicle speed detection sensor for 32 power output device 743

Sensor for detecting engine speed of 4-speed reducer 744

5 driving bridge 745 second angle displacement sensor

6 wheel 75 controller

71 Hydraulic pump/motor 76 electro-hydraulic control module

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention unless otherwise specified.

As shown in fig. 1, the present invention provides a vehicle having a hydraulic braking energy and idling energy recovery power system, which includes an engine 1, a transmission 3 connected to the engine 1 through a clutch 2, a reduction gear 4 connected to the transmission 3 through a transmission shaft 31, a drive axle 5 connected to the reduction gear 4, and wheels 6 mounted on the drive axle 5. Meanwhile, the vehicle with the hydraulic braking energy and idling energy recycling power system further comprises a hydraulic pump/motor 71, a first energy accumulator 72 connected with the hydraulic pump/motor 71, and a second energy accumulator 73 connected with the hydraulic pump/motor 71, wherein the gearbox 3 is provided with a power output device 32, and the hydraulic pump/motor 71 is connected with the power output device 32. The working principle of the vehicle with the hydraulic braking energy and idling energy recycling power system is as follows: when the vehicle is in a braking condition, the rotating wheel 6 drives the hydraulic pump/motor 71 to act through the drive axle 5, the speed reducer 4, the transmission shaft 31, the gearbox 3 and the power output device 32, at this time, the hydraulic pump/motor 71 serves as a pump, and hydraulic oil in the second energy accumulator 73 flows into the first energy accumulator 72 through the hydraulic pump/motor 71, so that kinetic energy, namely braking energy, of the vehicle in a braking process is converted into hydraulic energy to be stored in the first energy accumulator 72, and the wheel 6 and the vehicle are braked, so that the direct waste of the part of kinetic energy caused when the wheel 6 is braked only by a friction brake, the temperature rise of the friction brake and the like are avoided; when the vehicle is in an idle working condition, the running engine 1 drives the hydraulic pump/motor 71 to act through the gearbox 3 and the power output device 32, at this time, the hydraulic pump/motor 71 is used as a pump, and hydraulic oil in the second energy accumulator 73 flows into the first energy accumulator 72 through the hydraulic pump/motor 71, so that mechanical energy output by the engine 1 under the idle working condition, namely idle energy, is converted into hydraulic energy to be stored in the first energy accumulator 72, and the energy can be prevented from being directly wasted; when power needs to be provided to drive the wheels 6 to rotate, hydraulic oil in the first accumulator 72 flows into the second accumulator 73 through the hydraulic pump/motor 71 and drives the hydraulic pump/motor 71 to act, at the moment, the hydraulic pump/motor 71 serves as a motor and drives the gearbox 3 to rotate through the power output device 32, and the gearbox 3 drives the wheels 6 to rotate through the transmission shaft 31, the speed reducer 4 and the drive axle 5, so that the hydraulic energy stored in the first accumulator 72 is released and converted into the kinetic energy of vehicle running; and then the recovery and utilization of the braking energy and the idling energy are realized, and the energy consumption of the vehicle is low.

In the present invention, the hydraulic pump/motor 71, the first accumulator 72, and the second accumulator 73 constitute a hydraulic braking energy and idle energy recovery power system.

As shown in fig. 1, the vehicle having the hydraulic braking energy and idle energy recycling power system in the present embodiment further includes a first angular displacement sensor 741 mounted on the brake pedal, a pressure detection sensor 742 connected to the first accumulator 72, and a controller 75 for controlling the displacement of the hydraulic pump/motor 71, wherein the first angular displacement sensor 741 and the pressure detection sensor 742 are both connected to the controller 75, and the hydraulic pump/motor 71 is connected to the controller 75. The first angular displacement sensor 741 detects an angular displacement of the brake pedal, that is, a rotation angle of the brake pedal, and feeds back a rotation angle signal of the brake pedal to the controller 75. The pressure detection sensor 742 is configured to detect the pressure of the hydraulic oil in the first accumulator 72, and to feed back a pressure value signal to the controller 75. In the braking condition, when the driver steps on the brake pedal, the first angular displacement sensor 741 detects a rotation angle of the brake pedal, and transmits a rotation angle signal to the controller 75, and the controller 75 sequentially judges that the vehicle is in the braking condition; meanwhile, if the pressure value fed back to the controller 75 by the pressure detection sensor 742, that is, the pressure of the hydraulic oil in the first accumulator 72 is lower than the set maximum pressure, the controller 75 allows the first accumulator 72 to recover energy, the controller 75 sets the displacement of the hydraulic pump/motor 71 to non-zero, so that the hydraulic pump/motor 71 can be used as a pump, and the rotating wheels 6 drive the hydraulic pump/motor 71 to act through the drive axle 5, the reducer 4, the transmission shaft 31, the gearbox 3 and the power output device 32, and the hydraulic pump/motor 71 is used as a pump, and causes the hydraulic oil in the second accumulator 73 to flow into the first accumulator 72 through the hydraulic pump/motor 71, thereby converting the kinetic energy of the vehicle into hydraulic energy to be stored in the first accumulator 72, i.e., recovery of braking energy, and braking of the wheels 6 and the vehicle is achieved, and the controller 75 determines how much energy is recovered by controlling the displacement of the hydraulic pump/motor 71; meanwhile, if the pressure value fed back to the controller 75 by the pressure detection sensor 742 reaches the set maximum pressure value, the controller 75 does not allow the first accumulator 72 to recover energy, and the controller 75 sets the displacement of the hydraulic pump/motor 71 to zero, so that the hydraulic pump/motor 71 cannot be used as a pump, and at this time, the mechanical friction brake alone provides a braking force to brake the wheels 6 and the vehicle. The embodiment divides the braking condition into three modes according to the required braking force: light braking, normal braking, emergency braking. In a slight braking working condition, the hydraulic braking energy and idling energy recycling power system provides power independently; in a conventional braking working condition, a hydraulic braking energy and idling energy recycling power system and a mechanical friction brake provide braking force together; in an emergency braking condition, the braking force is provided solely by the mechanical friction brakes. The specific realization method is to set idle stroke on the brake pedal. When the driver steps on the brake pedal to rotate within the idle stroke range, the vehicle is in a light braking condition, the brake pedal will not trigger the mechanical friction brake to act, and at this time, the mechanical friction brake will not provide braking force, but the controller 75 sets the displacement of the hydraulic pump/motor 71 to be non-zero because the first angular displacement sensor 741 detects that the brake pedal has a rotation angle, so that the pressure type braking energy and idle speed energy recycling power system separately provides braking force. When the driver steps on the brake pedal and the rotation angle of the brake pedal exceeds the idle stroke range and is smaller than the set angle, the vehicle is in a normal braking condition, the brake pedal triggers the mechanical friction brake to act, the mechanical friction brake provides braking force at the moment, meanwhile, the controller 75 sets the displacement of the hydraulic pump/motor 71 to be non-zero as the first angular displacement sensor 741 detects that the brake pedal has the rotation angle, and then the pressure type braking energy and the idle energy recycling power system and the mechanical friction brake provide braking force together. When the driver presses the brake pedal and the rotation angle of the brake pedal exceeds the idle stroke and exceeds the set angle, the vehicle is in an emergency braking condition, the brake pedal triggers the mechanical friction brake to act, and provides braking force, but the controller 75 sets the displacement of the hydraulic pump/motor 71 to zero as the first angular displacement sensor 741 detects that the rotation angle of the brake pedal exceeds the set value, so that the braking force is provided only by the mechanical friction brake. In the braking working condition, the hydraulic braking energy and idling energy recycling power system mainly recycles kinetic energy in the driving process of the vehicle.

As shown in fig. 1, the vehicle provided with the hydraulic braking energy and idling energy recovery and utilization power system according to the present embodiment further includes a vehicle speed detection sensor 743 connected to the controller 75, and an engine speed detection sensor 744 connected to the controller 75, where the vehicle speed detection sensor 743 is used to detect the traveling speed of the vehicle, and the engine speed detection sensor 744 is used to detect the rotation speed of the engine 1. In the idle operation, the vehicle running speed fed back by the vehicle speed detection sensor 743 is zero by the controller 75, but the engine 1 speed fed back by the engine speed detection sensor 744 by the controller 75 is not zero, and if the pressure value fed back by the pressure detection sensor 742 is lower than the set maximum pressure value by the controller 75, the controller 75 allows the first accumulator 72 to recover energy, the displacement of the hydraulic pump/motor 71 is set to be non-zero by the controller 75, so that the hydraulic pump/motor 71 can be used as a pump, the engine 1 drives the hydraulic pump/motor 71 to operate through the clutch 2, the transmission 3 and the power output device 32, the hydraulic pump/motor 71 is used as a pump, and the hydraulic oil in the second accumulator 73 flows into the first accumulator 72 through the hydraulic pump/motor 71, so as to pump the mechanical energy output by the engine 1, That is, idle energy is converted into hydraulic energy to be stored in the first accumulator 72, and recovery of the idle energy is achieved, and the controller 75 determines how much energy is recovered by controlling the displacement of the hydraulic pump/motor 71; meanwhile, if the pressure value fed back by the pressure detection sensor 742, which is received by the controller 75, reaches the set maximum pressure value, the controller 75 does not allow the first accumulator 72 to recover energy, and the controller 75 sets the displacement of the hydraulic pump/motor 71 to zero, at which time the hydraulic pump/motor 71 cannot be used as a pump and the idle energy of the engine 1 cannot be recovered. In the idling working condition, the hydraulic braking energy and the idling energy are recycled, and the power system is mainly used for recycling mechanical energy lost in the idling state of the engine 1.

As shown in fig. 1, the vehicle having the hydraulic braking and idling energy recovery/utilization power system according to the present embodiment further includes a second angular displacement sensor 745 mounted on the accelerator pedal, and the second angular displacement sensor 745 is connected to the controller 75. The second angular displacement sensor 745 is used to detect the angular displacement, i.e., the rotational angle, of the accelerator pedal. In a starting working condition, when a driver steps on an accelerator pedal, the second angular displacement sensor 745 detects the angular displacement of the accelerator pedal and transmits an angular displacement signal to the controller 75, and the controller 75 judges that the vehicle is in the starting working condition according to the fact that the angular displacement is lower than a set value. Meanwhile, if the pressure value fed back by the pressure detection sensor 742, which is received by the controller 75, is higher than the set pressure value, the controller 75 allows the first accumulator 72 to release energy, the controller 75 sets the displacement of the hydraulic pump/motor 71 to be non-zero, the hydraulic oil in the first accumulator 72 flows into the second accumulator 73 through the hydraulic pump/motor 71, and the hydraulic oil drives the hydraulic pump/motor 71 to act, the hydraulic pump/motor 71 serves as a motor, and the hydraulic pump/motor 71 drives the wheels 6 to rotate through the power output device 32, the gearbox 3, the transmission shaft 31, the reducer 4, and the drive axle 5, so as to transmit power to the wheels 6, and release and convert the hydraulic energy in the first accumulator 72 into kinetic energy. The controller 75 controls how much energy the first accumulator 72 releases by controlling the displacement of the hydraulic pump/motor 71. Meanwhile, if the pressure value fed back from the pressure detection sensor 742, which is received by the controller 75, is lower than the set pressure value, the controller 75 does not allow the first accumulator 72 to release energy, and the controller 75 sets the displacement of the hydraulic pump/motor 71 to zero, at which time the engine 1 provides the power required for the vehicle to travel. In this embodiment, an idle stroke is set on the accelerator pedal, and in a starting condition, when the driver steps on the accelerator pedal and the accelerator pedal rotates in the idle stroke, the engine 1 will not provide driving force, so that when the pressure value of the first energy accumulator 72 is higher than a set value, only the hydraulic braking energy and the idle energy are recycled to provide power by the power system. In the acceleration working condition and the climbing working condition, when a driver steps on the accelerator pedal, the rotation range of the accelerator pedal exceeds the idle stroke, the engine 1 provides power, and the controller 75 determines that the vehicle is in an acceleration condition or a climbing condition based on the angular displacement of the accelerator pedal detected by the second angular displacement sensor 745, meanwhile, if the controller 75 receives a pressure value fed back by the pressure detection sensor 742 that is higher than a set pressure value, the controller 75 allows the first accumulator 72 to release energy, the controller 75 sets the displacement of the hydraulic pump/motor 71 to be non-zero, the hydraulic oil in the first accumulator 72 flows into the second accumulator 73 through the hydraulic pump/motor 71, and drives the pump/motor to act, and the pump/motor is used as a motor to drive the wheels 6 to rotate through the power output device 32, the gearbox 3, the transmission shaft 31, the speed reducer 4 and the drive axle 5. The hydraulic energy in the first accumulator 72 is released and converted into kinetic energy for the vehicle to travel. The controller 75 determines how much energy the first accumulator 72 releases by controlling the displacement of the hydraulic pump/motor 71; at the moment, the power required by the vehicle running is provided by the engine 1 and a hydraulic braking energy and idling energy recycling power system together. The power of the engine 1 and the power of the hydraulic braking energy and idling energy recycling power system are coupled through the power output device 32 and the gearbox 3, and jointly drive the wheels 6 to rotate through the transmission shaft 31, the reducer 4 and the drive axle 5. In the acceleration mode or the climbing mode, if the controller 75 receives that the pressure value fed back by the pressure detection sensor 742 is lower than the set pressure value, the controller 75 does not allow the first accumulator 72 to release energy, the controller 75 sets the displacement of the hydraulic pump/motor 71 to zero, and at this time, only the engine 1 provides the power required for the vehicle to run. In the starting, accelerating and climbing working conditions, the hydraulic braking energy and idling energy recycling power system releases the energy recycled in the braking and idling working conditions, and the energy recycling is realized.

As shown in fig. 1, the vehicle with hydraulic braking energy and idle energy recycling power system in this embodiment further includes a valve set connected to the hydraulic pump/motor 71, the valve set is connected to the controller 75, and the valve set is connected to the first accumulator 72 and the second accumulator 73. In this embodiment, the controller 75 controls the displacement of the hydraulic pump/motor 71 by controlling the valve group operation, and controls the flow direction of the hydraulic oil among the first accumulator 72, the second accumulator 73, and the hydraulic pump/motor 71, thereby controlling the use of the hydraulic pump/motor 71 as a pump or a motor, and controlling whether the first accumulator 72 can recover or release energy.

Additionally, during cruise conditions, the operating mode of the vehicle is the same as that of a conventional vehicle, with the engine 1 alone providing power, and the controller 75 zeroing the displacement of the hydraulic pump/motor 71.

The above-mentioned power output device 32 is abbreviated as PTO in english. The transmission 3 is an automatic transmission. The speed reducer 4 is a main speed reducer. The first accumulator 72 is a high pressure accumulator, the second accumulator 73 is a low pressure accumulator, and the high and low pressure accumulators achieve automatic flow compensation. The output shaft of the engine 1 is connected with the input shaft of the clutch 2, the output shaft of the clutch 2 is connected with the input shaft of the automatic transmission with the PTO, and the rotating speed of the automatic transmission is consistent with that of the engine 1. The output shaft of the automatic gearbox is connected with a transmission shaft 31, the transmission shaft 31 is connected with a main speed reducer, the main speed reducer is connected with a drive axle 5, and the drive axle 5 is connected with wheels 6. In the present embodiment the drive axle 5 is in particular connected to the rear wheels. The valve block is part of the electro-hydraulic control module 76. The first accumulator 72 is connected to the electro-hydraulic control module 76 via the respective controller 75, and the second accumulator 73 is connected to the electro-hydraulic control module 76. The electro-hydraulic control module 76 is coupled to the controller 75. The controller 75 of the present embodiment employs a PLC.

In the present embodiment, the vehicle having the hydraulic braking energy and idle energy recovery and utilization power system is a parallel hydraulic hybrid vehicle. The vehicle recycles braking energy and idling energy through a hydraulic system, and optimizes the fuel efficiency of the engine 1 by the recycled energy, so that higher energy-saving efficiency is achieved. The vehicle with the hydraulic braking energy and idling energy recycling power system perfectly applies the hydraulic hybrid power technology to heavy vehicles, and has the advantages of fewer added components on the basis of the existing original vehicle, compact result, capability of recycling kinetic energy of the vehicle in the processes of deceleration, braking and idling to the maximum extent, good energy-saving effect, high energy recycling rate and low production cost compared with the existing oil-electricity hybrid power vehicle. In the present embodiment, the engine 1 is a main power source; the hydraulic braking energy and idling energy recycling power system forms an auxiliary power source, the two power sources are in a parallel connection structure, and the two power sources can be independently controlled. Not only can the original vehicle structure be kept basically unchanged, but also the control is flexible and convenient; meanwhile, the PTO on the gearbox 3 is utilized to realize the torque coupling connection of the auxiliary power source and the main power source, so as to form a parallel hydraulic hybrid power system. Meanwhile, the vehicle uses the hydraulic accumulator as an energy storage unit, compared with a hybrid electric vehicle using a storage battery and a super capacitor, the energy conversion link is less, larger auxiliary power can be provided in a short time under the same condition, the overall structure of the vehicle is simple, and the service life is long. In addition, when the vehicle is used, the controller 75 distributes the main power source and the auxiliary power source by adjusting the displacement of the hydraulic pump/motor 71 and the size of the accelerator of the engine 1, so that the working efficiency of the engine 1 can be optimized, the working point of the engine 1 is stabilized in a high-efficiency fuel area, the fuel economy is improved, and the fuel consumption of the vehicle is saved. In the embodiment, the energy storage device adopts a mode of combining a high-pressure energy accumulator with large capacity and a low-pressure energy accumulator with small capacity, and the combined mode solves the problems of insufficient oil quantity and oil temperature rise caused by overlarge volume, insufficient self-absorption capacity of the hydraulic pump/motor 71, hydraulic oil leakage and the like of the energy storage device.

The vehicle has two working states of energy recovery and energy reuse. When the vehicle is braked or idled, the vehicle is in an energy recovery working state, the hydraulic pump/motor 71 is used as a pump, oil is absorbed from the second energy accumulator 73 through the electro-hydraulic control module 76, and oil is filled into the first energy accumulator 72, so that the recovery of braking energy and vehicle idling energy is realized. When the vehicle is started, accelerated or climbed, the vehicle is in an energy recycling working state, at the moment, the hydraulic pump/motor 71 is used as a motor, and the vehicle is driven together with or independently of the engine 1 through the electro-hydraulic control module 76, the PTO and the gearbox 3, so that the output rate of the engine 1 is reduced, and the aim of saving energy is fulfilled.

The electro-hydraulic control module 76 is an auxiliary power source control module, and the controller 75 controls the electro-hydraulic control module 76 to control the displacement of the hydraulic pump/motor 71, control the switching of the working state of the hydraulic pump/motor 71 as a pump or a motor, and control the energy storage or discharge of the first accumulator 72. The hydraulic braking energy and idling energy recycling power system realizes the recycling of kinetic energy in the braking process, the recycled energy is stored in the first energy accumulator 72 in the form of hydraulic energy and is output in the form of torque, and the energy is coupled with the output torque of the engine 1 to form a torque-coupled hydraulic hybrid power system, so that the integrated functions of energy recycling and hydraulic hybrid power are realized. In this embodiment, the electrohydraulic control module 76 adopts a modular valve block and a plug-in valve block design, so as to optimize the oil path layout. The electro-hydraulic control module 76 mainly comprises a full-hydraulic pump control unit, a hydraulic motor working mode automatic switching hydraulic control unit, a hydraulic oil automatic exchange unit and a hydraulic motor safety overflow control unit, and the electro-hydraulic control module 76 solves the problems of temperature rise, aging and the like of hydraulic oil.

In the embodiment, on the basis that the structure and the configuration of the traditional vehicle structure including the parts such as the engine 1 and the gearbox 3 are unchanged, a set of hydraulic braking energy and idling energy recycling power system is added to form a parallel structure with the original power system. Compare that traditional vehicle increases components and parts less, the structure is comparatively compact, and the cost is lower. Meanwhile, the vehicle can realize the recovery and the reutilization of energy, and can optimize the fuel efficiency of the engine 1, so that the engine 1 always works in a high-efficiency fuel area, and the effects of energy conservation and emission reduction are achieved.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.