CN106427521A - Hybrid power driving system and vehicle - Google Patents

Abstract

The invention provides a hybrid drive system and a vehicle, belonging to the field of vehicle engineering. A hybrid drive system includes: engine, electric motor, and hydraulic components. The hydraulic assembly includes a hydraulic motor and a hydraulic pump optionally driven by an engine and/or an electric motor. The hydraulic pump is connected to the hydraulic motor through a pipeline and rotates the rotor of the hydraulic motor through hydraulic transmission. The vehicle includes the hybrid drive system described above, and the rotor of the hydraulic motor is connected to the wheels of the vehicle. The pipeline makes the connection and spatial arrangement of the entire hybrid drive system more flexible and changeable, and its mass is also smaller than that of a purely mechanically coupled power system. The use of this hybrid system also improves the vehicle's fuel economy.

Description

A hybrid drive system, vehicle

technical field

The invention relates to the field of vehicle engineering, in particular to a hybrid drive system and a vehicle.

Background technique

The engine and electric motor of a hybrid vehicle are generally connected to the drive axle through a power coupling device to drive the wheels to rotate. Usually, the power coupling device integrates the power synthesis device and transmission device of the engine and the electric motor, and has a complex structure and a large mass. Moreover, the purely mechanical connection between the engine and the electric motor and the wheels makes the spatial arrangement of the entire drive system have greater limitations. At the same time, the purely mechanical connection also causes a large mechanical impact on the drive system due to the variable driving conditions of the car. The engine is subjected to frequent transient response of the vehicle, which is not conducive to controlling the engine to run in the best working area, thus affecting the fuel economy of the vehicle.

Contents of the invention

The purpose of the present invention is to provide a hybrid drive system, in which the electric motor, the engine and the hydraulic motor are connected by pipes, so that the spatial arrangement can be more flexible, the structure is simple, and the mass is small.

Another object of the present invention is to provide a vehicle, which can quickly and conveniently control the connection and interruption of the power of the engine, electric motor and hydraulic pump, and can improve the fuel economy of the vehicle.

Embodiments of the present invention are achieved like this:

A hybrid drive system includes: an engine, an electric motor and a hydraulic assembly. The hydraulic assembly includes a hydraulic motor, and optionally a hydraulic pump driven by at least one of an engine and an electric motor. The hydraulic pump is connected to the hydraulic motor through a pipeline and rotates a rotor of the hydraulic motor through hydraulic transmission.

A vehicle includes the above-mentioned hybrid drive system, the rotor of the hydraulic motor is connected with the wheels of the vehicle.

The beneficial effect of the embodiment of the present invention is: the engine and the motor are connected to the hydraulic motor in the hydraulic assembly through the pipeline, so that the connection and spatial arrangement of the entire hybrid drive system are more flexible and changeable, and the quality is also better than that of a purely mechanical coupling The powertrain is small. Use this hybrid drive system for assembled vehicles. The use of hybrid power allows the vehicle to use a matching power source in different working conditions, improving the fuel economy of the vehicle. Vehicles will have varying degrees of impact on the drive system under variable driving conditions. The connection of the pipeline can greatly reduce the transient response of the vehicle to the engine, which is beneficial to control the engine to run in the optimal working area, thereby further improving the fuel economy of the vehicle.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

FIG. 1 is a schematic diagram of a hybrid drive system provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of a hybrid drive system provided by Embodiment 2 of the present invention;

3 is a schematic diagram of a hybrid drive system provided by Embodiment 3 of the present invention;

Fig. 4 is a schematic diagram of a hybrid drive system provided by Embodiment 4 of the present invention.

Icon: 100-hybrid drive system; 110-engine; 120-electric motor; 122-plug; 130-hydraulic components; 132-hydraulic motor; 134-hydraulic pump; 136-first clutch; 138-second clutch; 140- Pipeline; 142-fuel tank; 144-reversing valve; 200-hybrid drive system; 202-hydraulic accumulator; 300-hybrid drive system; 310-electric storage component; 312-battery; 314-first converter; 316-second converter; 400-hybrid drive system; 402-charger; 406-generator; 408-third converter.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower" and "outer" are based on the orientation or positional relationship shown in the drawings, or the Orientation or positional relationship that is conventionally placed is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a reference to the present invention. Invention Limitations. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection (including various mechanical connection forms, such as a coupling or a gear pair, etc.), or an electrical connection; it can be Direct connection, or indirect connection through an intermediary, or internal communication between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Example 1

Please refer to FIG. 1 , the present embodiment provides a hybrid drive system 100 , which includes an engine 110 , an electric motor 120 and a hydraulic assembly 130 . The hydraulic assembly 130 is connected to the engine 110 and the electric motor 120 respectively.

The hydraulic assembly 130 includes a hydraulic motor 132 and a hydraulic pump 134 . The hydraulic pump 134 is connected to the engine 110 through a first clutch 136 , and the hydraulic pump 134 is connected to the electric motor 120 through a second clutch 138 . The hydraulic pump 134 is connected to the hydraulic motor 132 through the pipeline 140, and drives the rotor (not shown) of the hydraulic motor 132 to rotate through hydraulic transmission. Hydraulic oil (not shown in the figure) is sucked out from the oil tank 142 by the hydraulic pump 134, then passed into the hydraulic motor 132 through the delivery channel of the pipeline 140, finally flows out by the hydraulic motor 132, and returns to the oil tank 142 through the delivery channel of the pipeline 140 Inside, the circulation of hydraulic oil is completed.

Preferably, in order to enable the rotor of the hydraulic motor 132 to rotate in both directions, the hydraulic pump 134 is connected to the hydraulic motor 132 through a reversing valve 144 .

The hydraulic motor 132 is preferably a two-way variable hydraulic motor, and may be one of various hydraulic motors such as a gear hydraulic motor, a vane hydraulic motor, and a plunger hydraulic motor. The reversing valve 144 has two working positions, namely a first working position and a second working position with opposite directions, and is normally in the first working position or the second working position. When the reversing valve 144 is in the above two different working positions, the flow direction of the hydraulic oil in the hydraulic motor 132 is opposite. When the reversing valve 144 switches the working position, the flow direction of the hydraulic oil in the hydraulic motor 132 changes, so that the rotor rotation direction of the hydraulic motor 132 changes.

The motor 120 can be directly powered by an external power source (not shown) through a plug 122 . The motor 120 may be one of various motors widely used in the field of electric vehicles, such as a DC motor, a brushless DC motor, an asynchronous motor, a permanent magnet synchronous motor, and a switched reluctance motor.

It should be noted that the connection between the hydraulic pump 134 and the engine 110 and the connection between the hydraulic pump 134 and the electric motor 120 can also be connected using a planetary gear device (not shown in the figure) or other transmission devices, or using the first clutch 136 or the second clutch 136. The hybrid connection of the second clutch 138 and other transmissions. In other embodiments of the present invention, the engine 110 and the electric motor 120 may also be directly connected to the hydraulic pump 134 for only outputting power, and no connecting parts are provided therebetween. In this embodiment, the first clutch 136 and the second clutch 138 are preferably selected as connecting parts for the purpose of disconnecting and connecting the engine 110 and the electric motor 120 more conveniently and quickly.

In addition, it should be noted that in FIG. 1 , double solid lines represent mechanical connections, such as couplings and gear pairs; thin solid lines represent connections by pipes 140 ; dotted lines represent electrical connections. The first clutch 136 and the second clutch 138 shown in FIG. 1 do not represent fixed open and close modes in the hybrid drive system 100 . For example, both the first clutch 136 and the second clutch 138 can be set as normally open or normally closed, or either one of them is normally open and the other is normally closed.

The working principle of the hybrid drive system 100 is that when the hybrid drive system 100 is serving a low load condition, the first clutch 136 is disengaged, the second clutch 138 is closed, and the engine 110 is not working. The motor 120 is directly powered by the external power source through the plug 122 and starts to rotate. The power of the electric motor 120 is further transmitted to the hydraulic pump 134 through the second clutch 138 to drive the hydraulic pump 134 to rotate. The hydraulic pump 134 brings hydraulic oil from the oil tank 142 into the pipeline 140 , passes through the reversing valve 144 , and then drives the hydraulic motor 132 to work, thereby driving the rotor of the hydraulic motor 132 to rotate. In the low-load working condition, turning off the engine 110 and adopting the pure electric driving mode can avoid the low efficiency and poor fuel economy of the engine 110 when working in this working condition.

When the hybrid drive system 100 is serving a medium load condition, the first clutch 136 is engaged, the second clutch 138 is disengaged, the electric motor 120 is not operated, and the engine 110 is operated. The engine 110 works, and further transmits power to the hydraulic pump 134 through the first clutch 136, and drives the hydraulic pump 134 to rotate. The hydraulic pump 134 brings hydraulic oil from the oil tank 142 into the pipeline 140 , passes through the reversing valve 144 , and then drives the hydraulic motor 132 to work, thereby driving the rotor of the hydraulic motor 132 to rotate. Under medium load conditions, the engine 110 has higher working efficiency and better fuel economy.

When the hybrid drive system 100 is servicing high load conditions, both the first clutch 136 and the second clutch 138 are closed. The power output by the engine 110 is further transmitted to the hydraulic pump 134 through the first clutch 136 . The plug 122 is connected to an external power source, the motor 120 rotates, and transmits the power to the hydraulic pump 134 through the second clutch 138 . Therefore, the engine 110 and the electric motor 120 simultaneously drive the hydraulic pump 134 to rotate, and the hydraulic pump 134 brings hydraulic oil from the oil tank 142 into the pipeline 140, passes through the reversing valve 144, and then drives the hydraulic motor 132 to work, thereby driving the rotor of the hydraulic motor 132 to rotate. The engine 110 operates in a high-efficiency working area, and the engine 110 has a high working efficiency, but the output power is not enough to meet the requirements of the high-load working condition. At this time, the insufficient power is provided by the electric motor 120 .

It should be noted that the two working positions of the reversing valve 144 are applicable to the above working conditions.

The hybrid driving system 100 provided in this embodiment can conveniently control the connection and interruption of the power of the engine 110 , the electric motor 120 and the hydraulic pump 134 by using the closing and disengaging of the first clutch 136 and the second clutch 138 . In addition, the hydraulic pump 134 and the hydraulic motor 132 are connected by a pipe 140 , which can make the spatial arrangement of the entire hybrid drive system 100 flexible and changeable.

Example 2

Please refer to FIG. 2 , this embodiment provides a hybrid drive system 200, which is substantially the same as the hybrid drive system 100 of Embodiment 1, the main difference between the two is that the hydraulic assembly 130 of this embodiment also includes a hydraulic accumulator 202.

Referring to FIG. 1 again, the hydraulic accumulator 202 is connected to the hydraulic pump 134 through a pipeline 140 . The hydraulic accumulator 202 may be one of various accumulators such as a spring type accumulator, a gas isolation type accumulator (gas cylinder type, piston type, bladder type) and the like. The hydraulic accumulator 202 can absorb the excess high-pressure hydraulic oil output by the hydraulic pump 134 when the rotor of the hydraulic motor 132 decelerates and brakes, and recovers braking energy. Effect of hydraulic shocks and pressure pulsations.

The difference in working principle between the hybrid drive system 200 and the hybrid drive system 100 is that the hybrid drive system 200 has one more working mode. When the hybrid drive system 200 is serving a low load condition and the hydraulic energy stored in the hydraulic accumulator 202 is sufficient, both the first clutch 136 and the second clutch 138 are disconnected, and neither the engine 110 nor the electric motor 120 work. The hydraulic accumulator 202 releases the stored hydraulic energy, and the output high-pressure oil passes through the reversing valve 144 to drive the hydraulic motor 132 to rotate, thereby driving the rotor of the hydraulic motor 132 to rotate. The hydraulic energy used in this working mode is the energy recovered by the hybrid drive system 200 and stored in the hydraulic accumulator 202 during deceleration and braking, which can save energy and improve the fuel economy of the hybrid vehicle.

Example 3

Please refer to FIG. 3 and FIG. 1. This embodiment provides a hybrid drive system 300, which is substantially the same as the hybrid drive system 100 in Embodiment 1. The main difference between the two is that the hybrid drive system 300 in this embodiment is also An electric storage assembly 310 is included, and the electric storage assembly 310 includes a storage battery 312 . The motor 120 is electrically connected to the battery 312 , and when the current and voltage required by the motor 120 match the current and voltage provided by the battery 312 , the battery 312 can directly supply power to the motor 120 . The storage battery 312 can be replaced to ensure sufficient power to drive the motor 120 to rotate.

Preferably, referring to FIG. 3 and FIG. 1 again, in order to better match the current and voltage provided by the battery 312 with the current and voltage required by the motor 120 , the power storage assembly 310 further includes a first converter 314 . The battery 312 is electrically connected to the electric motor 120 through a first inverter 314 . The first converter 314 is a DC/DC converter (direct current/direct current converter) or a DC/AC converter (direct current/alternating current converter).

Preferably, please refer to FIG. 3 and FIG. 1 again, in order to recover excess electric energy when the hybrid drive system 300 is in a deceleration braking condition, the power storage assembly 310 further includes a second converter 316 . When the hybrid drive system 300 is in the deceleration braking mode and the battery 312 has insufficient power, the first clutch 136 is disconnected, the second clutch 138 is closed, and the engine 110 and the electric motor 120 do not work. At this time, the hydraulic pump 134 drives the electric motor 120 to run in the state of power generation, and the electric energy generated is converted into direct current through the second converter 316 and input to the battery 312 to charge the battery 312 to achieve the purpose of recovering braking energy. The second converter 316 is a DC/DC converter (direct current/direct current converter) or an AC/DC converter (alternating current/direct current converter). The motor 120 at this time is a generator motor.

It should be noted that the storage battery 312 may be one of various batteries such as lead-acid storage battery, lithium-ion storage battery, and nickel-metal hydride storage battery.

Example 4

Please refer to FIG. 4 and FIG. 1. This embodiment provides a hybrid drive system 400, which is roughly the same as the hybrid drive system 300 in Embodiment 3. The main difference between the two is that the power storage assembly 310 is also provided with The battery 312 is charged by the charger 402 . The charger 402 is electrically connected to the storage battery 312 . When the hybrid drive system 400 stops working and the storage capacity of the battery 312 is insufficient, the charger 402 can be connected to an external power source to charge the battery 312 .

Preferably, in order to further improve fuel economy, the power storage assembly 310 is further provided with a generator 406 and a third converter 408 for charging the battery 312 . The third converter 408 is an AC/DC converter (alternating current/direct current converter). The generator 406 is connected to the engine 110 . The generator 406 is connected to the battery 312 through a third converter 408 .

When the hybrid drive system 400 is serving the medium load condition, all the output power of the engine 110 is used to drive the hydraulic pump 134 to rotate, and the generator 406 is idling and does not generate electricity.

When the hybrid drive system 400 is serving the low-load condition, but the storage capacity of the battery 312 is insufficient, the engine 110 can be operated in a high-efficiency working area, and the working efficiency of the engine 110 is high, but the output power exceeds the power of the rotor of the hydraulic motor 132 demand, at this time the excess power can be used to charge the battery 312 through the generator 406 . The first clutch 136 is closed, the second clutch 138 is disconnected, and the electric motor 120 does not work. Part of the power output by the engine 110 is transmitted to the hydraulic pump 134 through the first clutch 136, driving the hydraulic pump 134 to rotate, the hydraulic pump 134 brings the hydraulic oil from the oil tank 142 into the pipeline 140, passes through the reversing valve 144, and then drives the hydraulic motor 132 to work, Thus, the rotor of the hydraulic motor 132 is driven to rotate. Another part of the excess power output by the engine 110 drives the generator 406 to generate electricity, and the alternating current generated by the generator 406 is converted into direct current by the third converter 408 and input into the battery 312 to charge the battery 312 .

When the hybrid drive system 400 stops working and the storage battery 312 is insufficient, the engine 110 can continue to run in the high-efficiency working area. The engine 110 has a high working efficiency, and the output power is charged to the battery 312 through the generator 406 . At this time, both the first clutch 136 and the second clutch 138 are disconnected, and the electric motor 120 does not work. The power output by the engine 110 is only used to drive the generator 406 to rotate and generate electricity. The alternating current generated by the generator 406 is converted into direct current by the third converter 408 and input to the battery 312 to charge the battery 312 .

For simplicity, please refer to the corresponding contents in Embodiments 1-3 for those not mentioned in this embodiment.

The hybrid drive systems 100-400 provided in Embodiments 1-4 of the present invention can be used to form specific working devices, such as vehicles, including tricycles, motorcycles, automobiles, and the like. For example, when any one of the hybrid drive systems 100-400 is connected to the wheels of the car, the rotors of the hydraulic motors 132 are mechanically connected to the wheels, and the number of hydraulic motors 132 matches the number of wheels. By changing the direction of rotation of the hydraulic motor 132 through the reversing valve 144, the vehicle can move forward and backward. The pipeline 140 is used to connect the engine 110 and the motor 120 to the wheels, so that the impact of the variable driving conditions of the vehicle on the drive system is less affected, and the transient response of the vehicle to the engine 110 can be greatly reduced, thereby effectively It is beneficial to control the engine 110 to run in the optimal working area, thereby further improving the fuel economy of the vehicle.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of hybrid electric drive system, it is characterised in that the hybrid electric drive system includes：Electromotor, motor And hydraulic package；

The hydraulic package includes hydraulic motor, alternatively receives the driving of at least one of the electromotor and the motor Hydraulic pump, the hydraulic pump is connected with the hydraulic motor by pipeline and is made the rotor of the hydraulic motor by hydraulic drive Rotate.

2. hybrid electric drive system according to claim 1, it is characterised in that the hydraulic package is also included for leading to The hydraulic accumulator that hydraulic drive rotates the rotor of the hydraulic motor is crossed, the hydraulic accumulator is connected by the pipeline Between the hydraulic pump, the hydraulic motor.

3. hybrid electric drive system according to claim 1, it is characterised in that the hybrid electric drive system is also wrapped The storage assembly for being provided with accumulator is included, the accumulator provides electric energy with the electronic mechatronics and to the motor.

4. hybrid electric drive system according to claim 3, it is characterised in that the storage assembly also includes the first change Parallel operation, the accumulator is become selected from DC/DC by first changer and the electronic mechatronics, first changer Parallel operation or DC/AC changer.

5. hybrid electric drive system according to claim 4, it is characterised in that the storage assembly also includes the second change Parallel operation, the accumulator is selected from the DC/ by second changer and the electronic mechatronics, second changer DC changer or AC/DC changer, the motor is generator motor.

6. hybrid electric drive system according to claim 3, it is characterised in that the storage assembly also include for The charger that the accumulator charges, the charger is connected with the storage battery.

7. hybrid electric drive system according to claim 3, it is characterised in that the storage assembly is also included by described Engine driving is dallied or the electromotor that generated electricity and the 3rd changer, and the electromotor is connected with the electromotor, institute State electromotor to be connected with the storage battery by the 3rd changer, the 3rd changer is AC/DC changer.

8. hybrid electric drive system according to claim 1, it is characterised in that the hydraulic package also includes commutation Valve, the hydraulic pump is connected with the hydraulic motor by the reversal valve, and the hydraulic motor is bidirectional variable hydraulic motor.

9. the hybrid electric drive system according to any one of claim 1～8, it is characterised in that the electromotor, described Motor is connected with the hydraulic pump by first clutch, second clutch respectively.

10. a kind of vehicle, it is characterised in that include the hybrid electric drive system as described in any one of claim 1～9, institute The rotor for stating hydraulic motor is connected with the wheel of the vehicle.