CN201071519Y - Output torque equalization control device of prime motor - Google Patents

Abstract

The utility model relates to a prime motor output torque balance control device, comprising a pressing oil tank, a storage energy device, a storage energy pump drivingly connected with an output shaft of the prime motor and a power motor; wherein the output shaft of the prime motor is drivingly connected with the output shaft of a main hydraulic pump. The outlet of the storage energy pump is connected with the inlet of the storage energy device through a first one-way valve used for allowing hydraulic oil to flow from the outlet of the storage energy pump to the outlet and the inlet of the storage energy device. The outlet and the inlet of the storage energy device are connected with the inlet of the power motor. The inlet of the power motor is connected with the hydraulic oil tank through a second one-way valve for allowing the hydraulic oil to flow from the oil tank to the inlet of the power motor. The control device also comprises a torque controller used for controlling the storage energy pump and the output quantity of a brunt motor according to controlling signals. The utility model provides the prime motor output torque adjusting device, which has the advantages of simple structure, reliable performance, cost reduction, wide application scope and acquisition of balance control of output torque.

Description

Prime mover output torque balance control device

(1) Technical field

The utility model relates to the fields of fluid transmission control and prime mover torque control, and is suitable for various prime movers with severe load changes, especially an output torque equalization control device for internal combustion engines and other prime movers in engineering machinery with severe load changes.

(2) Background technology

During the construction process of some construction machinery, due to the drastic change of the load, the output torque of the prime mover also changes greatly. For example, during the working process of a hydraulic excavator, its workload changes drastically, resulting in drastic changes in the working pressure of its hydraulic device, and because the hydraulic pump is directly driven by the diesel engine, the torque acting on the output shaft of the diesel engine also changes greatly , when the device pressure is higher, the load torque of the diesel engine is also larger, and when the device pressure is lower, the load torque of the diesel engine is also smaller. This situation led directly to two consequences. First, in order to meet the normal working requirements of these construction machinery and equipment, even if the average load power on these equipment is not large, the diesel engine must be selected according to the maximum load torque that may occur, resulting in the power of the selected diesel engine being too large, otherwise it will be easy The phenomenon of frequent overloading and stalling of diesel engines occurs; secondly, the high-efficiency operating point of diesel engines is generally located in the high-torque area, but because the output torque of the diesel engine changes drastically with the load, the operating point of the diesel engine is unstable. The back and forth changes between small torque areas with poor economy affect the working efficiency of the diesel engine. Due to these two reasons, the fuel is not fully utilized, resulting in a waste of energy. In addition, high-power diesel engines will also lead to an increase in manufacturing costs. In the traditional design in the past, this is the price that must be paid to meet the peak power requirements under the maximum load, so it forms a contradiction between meeting the maximum load power requirements and increasing manufacturing costs and saving fuel.

In order to solve the contradictions mentioned above, the oil-electric hybrid technology is usually used to adjust the output torque of the prime mover such as the internal combustion engine to stabilize it. In this scheme, in addition to driving the hydraulic pump, the output power of the diesel engine also drives a generator, or all the output power of the diesel engine is used to drive the generator. Rechargeable batteries and super capacitors are used as energy storage components. When the load is high (equivalent to a small or zero pilot control pressure), the battery and supercapacitor are charged, and the electric energy stored in the supercapacitor and battery is released to drive the electric motor when the load is heavy (equivalent to a high pilot control pressure). The auxiliary diesel engine drives the hydraulic pump or the hydraulic pump is directly driven by the electric motor alone, so that the energy is absorbed from the diesel engine when the load is small, and the auxiliary diesel engine drives the hydraulic pump together when the load is large, so that the output torque of the diesel engine can be controlled to be stable around a fixed value at all times, and then Control the working point of the diesel engine to always be in the high-efficiency and energy-saving area stably. However, due to the limitations of the current technological development, the battery capacity and battery cell voltage are low, and the life is limited. When used in high-power equipment, the volume is large and the price is expensive. The corresponding power circuit is complex and costly. If a supercapacitor is used as an energy storage element, although its charging life is much higher than that of a battery, its monomer voltage is also low, and it also has the disadvantages of bulky, complex circuits, and high cost when used in high-power equipment. In addition, due to the multiple conversions of "mechanical energy→electrical energy→mechanical energy" in the process of power transmission, the overall efficiency in the process of power transmission is greatly reduced. In addition to this, flywheel batteries are also an option, but this technology is currently immature for high-power equipment, and the cost is still high.

In addition to the use of hybrid electric power technology, hydrostatic transmission and secondary adjustment technology using hydraulic technology are also effective means to effectively adjust the output torque of the prime mover, but this structure uses "diesel engine→variable hydraulic pump→accumulator→ The power transmission mode of "variable hydraulic motor → load" is only suitable for equipment driven by hydraulic motors, but not suitable for equipment driven by hydraulic pumps.

(3) Contents of the invention

In order to overcome the shortcomings of the existing prime mover or internal combustion engine output torque adjustment technology, such as complex structure, high cost and small application range, the utility model provides a prime mover output torque converter with simple structure, reliable performance, low cost and wide application range. The torque adjustment device realizes the balanced control of its output torque.

The technical scheme that the utility model solves its technical problem adopts is:

A prime mover output torque balance control device, including a hydraulic oil tank, an accumulator, an energy storage pump connected to the output shaft of the prime mover, and a booster motor, the output shaft of the prime mover is connected to the output shaft of the main hydraulic pump, and the The outlet of the accumulator pump is connected to the inlet and outlet of the accumulator through the first check valve for allowing the hydraulic oil from the outlet of the accumulator pump to the inlet and outlet of the accumulator, and the inlet and outlet of the accumulator are connected to the outlet of the booster motor Inlet, the inlet of the booster motor is also connected with the hydraulic oil tank through the second one-way valve for allowing the hydraulic oil to enter the booster motor from the tank; Torque controller for motor displacement.

As a preferred solution: the inlet and outlet of the accumulator are connected through a second controlled one-way valve used to prevent hydraulic oil from the inlet and outlet of the accumulator to the inlet of the booster motor without a control signal Access to the booster motor.

As another preferred solution: a pressure sensor is installed on the accumulator; the outlet of the accumulator pump is also used to prevent the hydraulic oil from the outlet of the accumulator pump to the fuel tank under the condition of no control signal The first controlled check valve is connected to the tank.

Further, the first controlled one-way valve and the second controlled one-way valve may be hydraulically controlled one-way valves, hydraulically controlled stop valves or electromagnetic stop valves.

Still further, the accumulator pump is an accumulator pump with a variable displacement structure or a constant displacement structure, and the booster motor is a booster motor with a variable displacement structure or a constant displacement structure.

Furthermore, the outlet of the accumulator is connected to the oil tank through an overflow valve. Set the maximum safe working pressure for the accumulator. The overflow valve can play a safety role.

Still further, the first transmission relationship of the energy storage pump, the booster motor, the output shaft of the prime mover, and the output shaft of the main hydraulic pump is: the control device also includes the first transfer gear, the second transfer gear, and the prime mover The output shaft is connected to the sun gear, the input shaft of the accumulator pump is connected to the first transfer gear, the first transfer gear meshes with the sun gear, the sun gear is connected to the input shaft of the main hydraulic pump, and the output shaft of the booster motor Connect the second transfer gear, which meshes with the sun gear.

The second transmission relationship between the energy storage pump, the booster motor, the output shaft of the prime mover and the output shaft of the main hydraulic pump is: the control device also includes a transfer gear, a sun gear connected with the output shaft of the prime mover, and the output shaft of the energy storage pump The input shaft is connected to the transfer gear, and the transfer gear meshes with the sun gear, the sun gear is connected to the input shaft of the main hydraulic pump, and the booster motor is coaxially connected with the energy storage pump.

The transfer gear can be located on both sides of the sun gear respectively.

The third transmission relationship of the energy storage pump, booster motor, prime mover output shaft, and output shaft of the main hydraulic pump is: the output shaft of the prime mover is connected to the output shaft of the main hydraulic pump, and the booster motor and the energy storage pump are connected to each other. Coaxially connected with the main hydraulic pump.

Or, the positions of the booster motor and the accumulator pump can be reversed; or: the booster motor and the accumulator pump can be connected to the output shaft of the prime mover first, and then connected to the input shaft of the main hydraulic pump, and the booster motor, the accumulator pump The position can be reversed; or: the booster motor is first connected to the output shaft of the prime mover, and then connected to the input shaft of the main hydraulic pump and the energy storage pump; more or: the energy storage pump is connected to the output shaft of the prime mover first, and then It is connected with the input shaft of the main hydraulic pump and the booster motor.

The fourth transmission relationship of the energy storage pump, the booster motor, the output shaft of the prime mover, and the output shaft of the main hydraulic pump is: the control device also includes a transfer gear, a sun gear connected with the output shaft of the prime mover, and the output shaft of the energy storage pump. The input shaft is connected to the transfer gear, and the transfer gear meshes with the sun gear, the sun gear is connected to the input shaft of the main hydraulic pump, and the booster motor is coaxially connected with the main hydraulic pump.

The booster motor can also be connected to the sun gear first, and then to the input shaft of the main hydraulic pump.

The fifth transmission relationship of the energy storage pump, the booster motor, the output shaft of the prime mover, and the output shaft of the main hydraulic pump is: the control device also includes a transfer gear, a sun gear connected with the output shaft of the prime mover, and the input of the booster motor The shaft is connected with the transfer gear, and the transfer gear meshes with the sun gear, the sun gear is connected with the input shaft of the main hydraulic pump, and the energy storage pump is coaxially connected with the main hydraulic pump.

The accumulator pump can also be connected to the sun gear first, and then connected to the input shaft of the main hydraulic pump.

The technical concept of the utility model is: the accumulator pump is driven by the output shaft of the prime mover through gear transmission to store energy in the accumulator; the hydraulic energy stored in the accumulator drives the booster motor to boost The motor then drives the output shaft of the prime mover through gear transmission; the output shaft of the prime mover also directly drives the main pump of the hydraulic device. In this way, the power transmission route of "prime mover output shaft → energy storage pump → accumulator → booster motor → prime mover output shaft → main hydraulic pump → load" can be formed. The inlet of the accumulator pump is connected to the oil tank, and its output port is connected to the inlet of the accumulator through a first one-way valve, and the first one-way valve only allows hydraulic oil to flow from the pump to the accumulator; The inlet of the accumulator is connected with the input port of the variable motor; the inlet of the variable motor is also connected with the oil tank through the second check valve, and the second check valve only allows hydraulic oil to flow from the tank to the inlet of the variable motor.

The displacement of the variable pump and the variable motor is controlled by the torque controller, and the torque controller controls the variable pump and the variable motor according to the pressure sensor signal, the pilot control pressure signal, the prime mover speed signal, and the main hydraulic device pressure signal. Motor displacement. When the whole device is working at a small load or a lower device working pressure, the flow of the accumulator pump is controlled to be greater than the flow of the booster motor, and the flow that the booster motor cannot absorb will enter the accumulator for storage; When the whole device works under heavy load condition or higher working pressure of the device, the flow rate of the accumulator pump is controlled to be smaller than the flow rate of the booster motor, and the insufficient flow rate of the booster motor is stored in the accumulator The hydraulic oil is supplemented to form the working condition that the accumulator and the hydraulic pump jointly drive the hydraulic motor.

The prime mover is a diesel engine as an example, so that when the pressure of the main hydraulic device is high, the accumulator assists the diesel engine to drive the main hydraulic pump to reduce the load torque of the diesel engine; The accumulator absorbs the output power of the diesel engine and stores it, increasing the load of the diesel engine. Finally, the output torque of the diesel engine tends to a balanced state, which is conducive to stabilizing the operating point of the diesel engine and providing conditions for the energy-saving control of the diesel engine. Since the displacement of the energy storage pump and the booster motor can be adjusted, the load torque on the diesel engine can also be adjusted, which helps to keep the operating point of the diesel engine always in the high-efficiency and energy-saving zone.

In order to ensure reliable control, a bypass oil passage is led out at the outlet of the energy storage pump, and leads to the oil tank through the first controlled one-way valve. The function of the first controlled one-way valve is that when there is a control signal, the hydraulic oil output by the energy storage pump can be directly returned to the oil tank to realize the unloading function; when there is no control signal, the hydraulic oil output by the energy storage pump The oil cannot return to the oil tank, but can only flow into the accumulator or booster motor. In addition, a second controlled one-way valve may also be provided on the inlet passage from the inlet and outlet of the accumulator to the hydraulic variable motor. The function of the second controlled one-way valve is to allow the hydraulic oil to flow from the accumulator inlet and outlet to the booster motor inlet when there is a control signal; to prevent the hydraulic oil from flowing from the accumulator when there is no control signal. The device flows to the booster motor.

The beneficial effects of the utility model are mainly manifested in: 1. The structure is simple and the performance is reliable; 2. The working point of the prime mover or the internal combustion engine can be stabilized, and it is suitable for construction machinery with severe load changes, and can make the design of construction machinery and other equipment adopt small The high-power engine makes the engine more efficient, saves fuel, and reduces the cost of the engine; 3. Wide range of applications.

(4) Description of drawings

Fig. 1 is the schematic diagram of the mechanical structure of the utility model.

Fig. 2 is a schematic diagram of the second mechanical structure.

Fig. 3 is a schematic diagram of the third mechanical structure.

Fig. 4 is a schematic diagram of the fourth mechanical structure.

Fig. 5 is a schematic diagram of the fifth mechanical structure.

Fig. 6 is a schematic diagram of the sixth mechanical structure.

Fig. 7 is a schematic diagram of the seventh mechanical structure.

Fig. 8 is a schematic diagram of the eighth mechanical structure.

Fig. 9 is a schematic diagram of the ninth mechanical structure.

Fig. 10 is a principle diagram of the tenth mechanical structure.

Fig. 11 is a principle diagram of the eleventh mechanical structure.

Fig. 12 is a schematic diagram of the twelfth mechanical structure.

Fig. 13 is a schematic diagram of the thirteenth mechanical structure.

Fig. 14 is a schematic diagram of the hydraulic structure of the utility model.

Fig. 15 is a schematic diagram of the second hydraulic structure of the present invention.

Fig. 16 is a schematic diagram of the third hydraulic structure of the present invention.

(5) Specific implementation methods

Below in conjunction with accompanying drawing, the utility model is further described.

Example 1

Referring to Fig. 1 and Fig. 14, a prime mover output torque balance control device, the control device includes an accumulator pump 5, an accumulator 4, a booster motor 2, transfer gears 11, 14 and a motor connected to the output shaft of the internal combustion engine 12 The central gear 13, the input shaft of the accumulator pump 5 is connected to the first transfer gear 14, the first transfer gear 14 meshes with the central gear 13, the central gear 13 is connected to the input shaft 15 of the main hydraulic pump, and the booster motor The output shaft of 2 is connected to the second transfer gear 11, the second transfer gear 11 meshes with the sun gear 13, and the energy storage pump 5 is connected to the booster motor 2; the outlet of the energy storage pump 5 passes through the first unit The valve 3 is connected to the inlet and outlet of the accumulator 4, and the first one-way valve 3 only allows hydraulic oil to flow from the outlet of the accumulator pump 5 to the inlet and outlet of the accumulator 4; the inlet and outlet of the accumulator 4 are directly connected to the booster motor 2, the inlet of the booster motor is also connected to the hydraulic oil tank 8 through the second check valve 1, and the second check valve 1 only allows hydraulic oil to flow from the oil tank 8 to the inlet of the booster motor; the control device also Includes a torque controller to control the displacement of the accumulator pump and main motor according to the control signal.

The prime mover of this embodiment is an internal combustion engine as an example, and a diesel engine is used, and of course other prime movers can also be used.

In this embodiment, the displacement of the accumulator pump 5 and the booster motor 2 are controlled by the torque controller, and the torque controller controls the accumulator pump 5 and the load torque on the input shaft of the main hydraulic pump 15 according to the pressure of the accumulator 4 The displacement of the booster motor 2 is controlled.

In Fig. 1 to Fig. 13, the connection relationship of the diesel engine 12, the booster motor 2, the accumulator pump 5, and the main hydraulic pump 15 in the mechanical transmission is shown. It can be seen that, in addition to directly driving the hydraulic main pump 15, the diesel engine 12 also drives the energy storage pump 5 through gear transmission or direct coaxial connection, while the booster motor 2 is directly connected with the output shaft of the diesel engine through gear transmission or direct coaxial connection. Under the control of the controller, in addition to being driven by the diesel engine 12 when the input pressure is low, it also drives the output shaft of the diesel engine 12 in reverse when the input pressure is high, and drives the main hydraulic pump 15 and the accumulator pump 5 together with the diesel engine 12 .

Wherein, referring to Fig. 2, the accumulator pump 5 and the booster motor 2 are in a through-shaft connection mode, and the booster motor 2 is installed at the tail of the accumulator pump 5, provided that the accumulator pump 5 is a through-shaft type pump, the accumulator pump 5 The first transfer gear 14 is housed on the input shaft of the diesel engine 12, and the first transfer gear 14 meshes with the sun gear 13 on the output shaft of the diesel engine 12, and the sun gear 13 is connected with the output shaft of the main hydraulic pump 15.

Referring to Fig. 3, the accumulator pump 5 and the booster motor 2 are still in the through-shaft connection mode, and the accumulator pump 5 is installed at the tail of the booster motor 2, provided that the booster motor 2 is a through-shaft motor, and the output shaft of the booster motor 2 The second point is housed on the top, the central gear 13 is connected with the output shaft of the main hydraulic pump 15 and the movable gear 11, and the second transfer gear 11 meshes with the central gear 13 on the output shaft of the diesel engine 12.

Referring to Fig. 4, the output shaft of the booster motor 2 is equipped with a second transfer gear 11, and the second transfer gear 11 meshes with the central gear 13 mounted on the output shaft of the diesel engine 12, and the central gear 13 is connected to the main hydraulic pump 15. The output shaft of the main hydraulic pump 15 is connected with the energy storage pump 5 .

Referring to Fig. 5, the output shaft of the booster motor 2 is equipped with a second transfer gear 11, and the second transfer gear 11 meshes with the central gear 13 mounted on the output shaft of the diesel engine 12, and the central gear 13 is connected to the accumulator pump 5. Connected, the accumulator pump 5 is connected with the output shaft of the main hydraulic pump 15 .

Referring to Fig. 6, the output shaft of the accumulator pump 5 is equipped with a second transfer gear 11, and the second transfer gear 11 meshes with the central gear 13 mounted on the output shaft of the diesel engine 12, and the central gear 13 is connected to the main hydraulic pump. The output shaft of 15 is connected, and the output shaft of main hydraulic pump 15 is connected with booster motor 2.

Referring to Fig. 7, the output shaft of the accumulator pump 5 is equipped with a second transfer gear 11, and the second transfer gear 11 meshes with the central gear 13 mounted on the output shaft of the diesel engine 12, and the central gear 13 and the booster motor 2 Connected, the booster motor 2 is connected to the output shaft of the main hydraulic pump 15 .

Referring to FIGS. 8-13 , the output shaft of the diesel engine 12 is connected to the output shaft of the main hydraulic pump 15 , and the booster motor 2 and the accumulator pump 5 are coaxially connected to the main hydraulic pump 15 . Combining the front and rear positions of the main hydraulic pump 15, the booster motor 2, and the energy storage pump 5, six different transmission relationships are obtained.

In the structural forms shown in Figures 1 to 13, the torque controller automatically detects the load torque of the main hydraulic pump 15, and controls the accumulator pump 5 according to the detected load torque of the main hydraulic pump 15 and the current pressure of the accumulator 4 And the displacement of booster motor 2. In the structural forms of Fig. 1 to Fig. 13, by properly controlling the ratio of the flow rates of the accumulator pump 5 and the booster motor 2, the accumulator 4 can either absorb energy from the output shaft of the diesel engine 12, or output to the diesel engine 12. Shaft output energy. The specific principle is: according to the load torque of the main hydraulic pump 15 and the pressure of the current accumulator 4, when the main hydraulic pump 15 is in a small load state, the flow rate of the accumulator pump 5 is controlled to be greater than the flow rate of the booster motor 2, and the booster motor 2 absorbs The remaining hydraulic oil then enters the accumulator 4, and now the accumulator 4 absorbs energy from the output shaft of the diesel engine 12, which is equivalent to increasing the torque burden on the output shaft of the diesel engine 12. When the main hydraulic pump 15 is under a heavy load condition, the flow rate of the accumulator pump 5 is controlled to be smaller than the flow rate of the booster motor. At this time, the flow rate of the accumulator pump 5 is not enough to drive the booster motor 2. The accumulator 4 is provided to form a situation that the booster motor 2 is jointly driven by the accumulator pump 5 and the accumulator 4 . At this time, the booster motor 2 has a driving effect on the output shaft of the diesel engine 12, which is equivalent to the output energy of the accumulator 4 to the output shaft of the diesel engine 12, so that the accumulator 4 and the diesel engine 12 drive the main hydraulic pump 15 together, reducing the pressure on the output shaft of the diesel engine 12. on the torque load. In this way, by controlling the flow rate ratio between the accumulator pump 5 and the booster motor 2, the load torque on the output shaft of the diesel engine 12 will eventually be controlled to remain substantially constant no matter whether the main hydraulic pump 15 is in a light load state or a heavy load state.

Relief valve 7 plays a safety role.

Example 2

Referring to Figures 1-13, Figure 15, and Figure 16, the inlet and outlet of the accumulator 4 in this embodiment are connected to the inlet of the booster motor 2 through the second controlled one-way valve 9, and the controlled one-way valve 9 does not have a control signal prevent hydraulic oil from the inlet and outlet of the accumulator 4 to the inlet of the booster motor 2 under certain conditions; the torque controller outputs the signal P _i according to the pilot pressure of the engineering machinery, and when the pilot pressure signal is greater than the preset threshold value, it will send to the first The two controlled one-way valves 9 send passage command signals P _i . , the accumulator 4 is equipped with a pressure sensor 6, the outlet of the accumulator pump 5 is also connected to the oil tank 8 through the first controlled one-way valve 10, and the controlled one-way valve 10 is under the condition of no control signal Prevent the hydraulic oil from the outlet of the accumulator pump 5 to the oil tank 8; the torque controller sends a control signal _Pc according to the pressure signal of the pressure sensor 6, and when the pressure signal is greater than the preset threshold value, the first The controlled one-way valve 9 issues a passage command to make P _c effective, so that the accumulator pump 5 unloads through the first controlled one-way valve 9 .

The first controlled one-way valve 9 and the second controlled one-way valve 10 may be hydraulically controlled one-way valves, hydraulically controlled stop valves or electromagnetic stop valves.

Referring to Fig. 15, the inlet and outlet of the accumulator 4 can also be connected with the inlet of the booster motor 2 through the second controlled one-way valve 9, and the second controlled one-way valve 9 prevents the hydraulic oil from the accumulator when there is no hydraulic control signal. The energy device 4 flows to the oil inlet of the booster motor 2. By means of the second controlled non-return valve 9 and the pilot pilot pressure signal enabling the P _i signal, it is possible to control whether the accumulator absorbs energy from the output shaft of the diesel engine 12 or releases energy to the output shaft of the diesel engine 12 . When the engineering machinery is not in operation, the P _i signal is invalid, and the engineering machinery is in an unloaded state. The second controlled check valve 9 prevents the hydraulic oil from flowing from the accumulator 4 to the inlet of the booster motor 2, so that the accumulator pump 5 is charged to the accumulator. The accumulator 4 stores energy, and the accumulator 4 absorbs energy from the output shaft of the diesel engine 12. At the same time, the oil inlet of the booster motor absorbs hydraulic oil from the oil tank 8 through the second check valve 1 to avoid air suction; when the construction machinery is in operation, The P _i signal is valid, the construction machinery is in working condition, and the second controlled check valve 9 is in the straight-through state. At this time, due to the action of the second check valve 1 to prevent the high-pressure oil from flowing into the oil tank 8, the high-pressure hydraulic pressure in the accumulator 4 All the oil can be directly input to the inlet of the booster motor 2, so that the booster motor 2 assists the diesel engine 12 to drive the main hydraulic pump 15 to meet the working needs of the engineering machinery.

Referring to Fig. 15, the oil outlet of the accumulator pump 5 can also lead to the oil tank 8 through a branch circuit equipped with a first controlled one-way valve 10, and the first controlled one-way valve 10 can prevent the The hydraulic oil flows from the outlet of the accumulator pump 5 to the oil tank 8 . When there is no control signal _Pc , the first controlled one-way valve 10 is in a one-way state, preventing hydraulic oil from flowing from the outlet of the accumulator pump 5 to the oil tank 8, and the hydraulic oil output by the accumulator pump 5 can only flow into the accumulator 4 Store energy. During the energy storage process, the pressure in the accumulator 4 increases gradually, when the controller uses the pressure sensor 6 to detect that the pressure in the accumulator 4 is higher than a certain value, a signal is sent to make the control signal P _c effective, Therefore, the first controlled one-way valve 10 is in a straight-through state, so that the output of the accumulator pump 5 can directly flow into the fuel tank, providing an unloading function for the accumulator pump 5, and avoiding the excessive pressure of the accumulator 4 which causes The power loss caused by the overflow of the hydraulic oil from the overflow valve 7, at the same time, the first check valve 3 prevents the hydraulic oil in the accumulator 4 from flowing into the oil tank through the first controlled check valve 10, thereby The previously stored energy is preserved.

In this embodiment, the accumulator pump 5 and the booster motor 2 can be of either a variable displacement structure or a fixed displacement structure. Under the fixed-displacement structure, although the balanced control of the output torque of the diesel engine 12 cannot be fully realized, the unbalanced output torque of the diesel engine 12 is at least reduced to a certain extent. Under the variable displacement structure of the accumulator pump 5 and the booster motor 2, applying the same torque balance controller control strategy as in the first embodiment can also realize the torque balance control with the same effect as the first embodiment.

In FIG. 16 , the second controlled one-way valve 9 in FIG. 15 is replaced by a second hydraulically controlled stop valve 9A, and the first controlled one-way valve 10 in FIG. 15 is replaced by a first hydraulically controlled stop valve 10A.

All the other structures and working process are identical with embodiment 1.

Claims (10)

1. A prime mover output torque equalization control device is characterized in that: the control device includes a hydraulic oil tank, an accumulator, an accumulator pump connected to the output shaft of the prime mover, a booster motor, and the output shaft of the prime mover is connected to the output shaft of the prime mover. The output shaft of the main hydraulic pump is connected by transmission, and the outlet of the accumulator pump is connected to the inlet and outlet of the accumulator through the first check valve for allowing the hydraulic oil from the outlet of the accumulator pump to the inlet and outlet of the accumulator. The inlet and outlet of the accumulator are connected to the inlet of the booster motor, and the inlet of the booster motor is also connected to the hydraulic oil tank through a second check valve for allowing the hydraulic oil to pass from the oil tank to the inlet of the booster motor; the control device also includes a A torque controller that controls the displacement of the accumulator pump and the main motor according to the control signal. 2. The prime mover output torque balance control device according to claim 1, characterized in that: the inlet and outlet of the accumulator are used to prevent hydraulic oil from entering and exiting the accumulator without a control signal. A second controlled one-way valve to the inlet of the booster motor connects the inlet of the booster motor. 3. The prime mover output torque equalization control device according to claim 1 or 2, characterized in that: a pressure sensor is installed on the accumulator; the outlet of the accumulator pump is also used to The first controlled check valve that prevents the hydraulic oil from the outlet of the accumulator pump to the oil tank is connected to the oil tank. 4. The prime mover output torque balance control device according to claim 3, characterized in that: the first controlled one-way valve and the second controlled one-way valve can be hydraulically controlled one-way valves and hydraulically controlled stop valves Or solenoid shut-off valve. 5. The prime mover output torque balance control device according to claim 4, characterized in that: the energy storage pump is an energy storage pump with a variable displacement structure or a constant displacement structure, and the booster motor is a variable displacement structure Or a booster motor with a fixed displacement structure. 6. The prime mover output torque balance control device according to claim 3, characterized in that: the outlet of the accumulator is connected to the oil tank through a relief valve. 7. The prime mover output torque equalization control device as claimed in claim 3, characterized in that: the control device further comprises a first transfer gear, a second transfer gear, a sun gear connected with the prime mover output shaft, an accumulator The input shaft of the energy pump is connected to the first transfer gear, and the first transfer gear meshes with the sun gear, and the sun gear is connected to the input shaft of the main hydraulic pump, and the output shaft of the booster motor is connected to the second transfer gear. The second transfer gear meshes with the sun gear. 8. The prime mover output torque balance control device according to claim 3, characterized in that: the control device further comprises a transfer gear, a sun gear connected with the output shaft of the prime mover, and the input shaft of the accumulator pump is connected with the transfer gear. The transfer gear meshes with the sun gear, the sun gear is connected with the input shaft of the main hydraulic pump, and the booster motor is coaxially coupled with the energy storage pump. 9. The prime mover output torque balance control device as claimed in claim 3, characterized in that: the output shaft of the prime mover is connected to the output shaft of the main hydraulic pump, and the booster motor and the energy storage pump are the same as the main hydraulic pump. Shaft connection. 10. The prime mover output torque balance control device according to claim 3, characterized in that: the control device also includes a transfer gear, a sun gear connected with the output shaft of the prime mover, and the input shaft of the energy storage pump is connected with the transfer gear. gears, the transfer gear meshes with the sun gear, the sun gear is connected with the input shaft of the main hydraulic pump, and the booster motor is coaxially connected with the main hydraulic pump.

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