Novel tandem type heavy liquid drive hybrid power system and vehicle

Abstract

The utility model discloses a novel tandem type heavy hydraulic drive hybrid power system and a vehicle, the system comprises an internal combustion engine assembly and an internal combustion engine pump / motor connected with the internal combustion engine assembly, and the internal combustion engine pump / motor is bidirectionally connected with a bidirectional variable pump / motor through a hydraulic pipeline; the bidirectional hydraulic pipeline between the internal combustion engine pump / motor and the bidirectional variable pump / motor is respectively connected with a power energy accumulator and a recovery energy accumulator, and the power energy accumulator and the recovery energy accumulator are connected through hydraulic pipelines; the two-way variable pump / motor is in driving connection with the running wheels; the system further comprises an intelligent control module assembly, and the internal combustion engine assembly, the internal combustion engine pump / motor and the two-way variable pump / motor are electrically connected with the intelligent control module assembly. The hydraulic drive hybrid power system can provide three working modes for vehicle running, provides the optimal working mode for different working conditions such as low speed, high load, rapid acceleration and frequent start and stop of the heavy vehicle, ensures that the power supply of the vehicle is matched with the power demand, and improves the fuel economy of the heavy vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical field of heavy-duty vehicle power systems, and in particular relates to a novel series-type heavy-duty liquid-driven hybrid power system and a vehicle. Background Art

[0002] Vehicles powered by pure electricity alone are currently the main research direction of our OEMs and institutions. However, due to the limitations of power source battery technology, their manufacturing costs remain high, and post-processing technology needs to be urgently addressed. The power density of pure electric power sources is low, especially in short-term, instantaneous energy recovery and power release. When acceleration, uphill, overtaking and other working conditions are required, energy consumption is too large and economy becomes poor. The biggest advantage of hydraulically driven power systems is that their power density is very high, which is especially suitable for medium and short-distance heavy-duty vehicles (such as urban buses, urban waste disposal vehicles, etc.) with frequent starts and stops and irregular alternating conditions of short-distance driving.

[0003] Therefore, the present application proposes a new series heavy-duty liquid-driven hybrid power system that combines a traditional internal combustion engine powertrain with a high-power density hydraulic drive system and an intelligent control module component information transmission and command system, using an accumulator to replace the traditional power battery to solve the problems of low power density and poor energy efficiency of current pure electric drive vehicles and optimize the driving conditions of heavy-duty vehicles. Utility Model Content

[0004] The utility model provides a novel series heavy-duty liquid-driven hybrid power system and a vehicle.

[0005] The specific technical scheme of the utility model is: a novel series heavy-duty liquid-driven hybrid power system, including an internal combustion engine assembly and an internal combustion engine pump / motor connected thereto, the internal combustion engine pump / motor and the two-way variable pump / motor are bidirectionally connected through a hydraulic pipeline, a power accumulator and a recovery accumulator are respectively connected on the bidirectional hydraulic pipeline between the internal combustion engine pump / motor and the two-way variable pump / motor, and both are connected through hydraulic pipelines; the two-way variable pump / motor is drivingly connected to the driving wheels;

[0006] The system also includes an intelligent control module component, and the internal combustion engine assembly, the internal combustion engine pump / motor, and the bidirectional variable pump / motor are electrically connected to the intelligent control module component.

[0007] Furthermore, preferably, a reduction mechanism is further included, wherein the reduction mechanism is rigidly connected to the bidirectional variable displacement pump / motor, and the traveling wheels are mounted on the reduction mechanism via a wheel drive assembly.

[0008] Further, preferably, the speed reduction mechanism is electrically connected to the intelligent control module assembly.

[0009] Furthermore, preferably, the hydraulic pipeline is a high-pressure steel wire braided hose.

[0010] The utility model also provides a novel series-type heavy-duty liquid-driven hybrid power vehicle, comprising the novel series-type heavy-duty liquid-driven hybrid power system.

[0011] The beneficial effects of the utility model are as follows: the utility model connects the internal combustion engine assembly in series with the hydraulic drive system, and adds an energy recovery system, which can provide three working modes for vehicle driving, and provide the optimal working mode for different working conditions such as low speed, high load, rapid acceleration, frequent start and stop of heavy vehicles, so as to ensure that the vehicle power supply matches the power demand and improve the fuel economy of heavy vehicles. The power accumulator and the recovery accumulator in the system can be charged and released at a high frequency, and the internal combustion engine assembly drives the internal combustion engine pump / motor to charge the power accumulator, so that the vehicle can realize independent driving of the power accumulator or joint driving of the power accumulator and the internal combustion engine assembly. When the vehicle needs to slow down or brake, the two-way variable pump / motor can charge the power accumulator, regenerate mechanical energy, or temporarily store excess energy in the recovery accumulator to realize energy reuse, and at the same time, it can also play a role in balancing and stabilizing pressure in the entire hydraulic circuit, ensuring the stability and safety of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the structure of a novel series heavy-duty liquid-driven hybrid power system according to an embodiment of the present invention;

[0013] Figure 2 It is a power transmission route map of the embodiment working mode three when kinetic energy is recovered;

[0014] In the figure: 1-internal combustion engine assembly; 2-internal combustion engine pump / motor; 3-power accumulator; 4-liquid flow pipeline; 5-energy control module assembly; 6-bidirectional variable pump / motor; 7-wheel drive assembly; 8-reduction mechanism; 9-driving wheels; 10-recovery accumulator. DETAILED DESCRIPTION

[0015] In order to make the technical problems and technical solutions solved by the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0016] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0017] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] like Figure 1 As shown, the novel series heavy-duty liquid-driven hybrid power system described in this embodiment includes an internal combustion engine assembly 1, an internal combustion engine pump / motor 2, a two-way variable pump / motor 6, a hydraulic pipeline 4 (a high-pressure steel wire braided hose), a power accumulator 3, a recovery accumulator 10, a wheel drive component 7, a reduction mechanism 8, a driving wheel 9, and an intelligent control module component 5. The internal combustion engine assembly 1 is rigidly connected to the internal combustion engine pump / motor 2, and the internal combustion engine pump / motor 2 is bidirectionally connected to the two-way variable pump / motor 6 through a hydraulic pipeline 4 (that is, the oil outlet of the internal combustion engine / motor 2 is connected to the oil inlet hydraulic pipeline of the two-way variable pump / motor 6, and the oil outlet of the two-way variable pump / motor 6 is connected to the oil inlet hydraulic pipeline of the internal combustion engine / motor 2); the two-way hydraulic pipeline 4 between the internal combustion engine pump / motor 2 and the two-way variable pump / motor 6 is respectively connected with a power accumulator 3 and a recovery accumulator 10 (that is, the oil outlet of the internal combustion engine / motor 2 is connected to the power accumulator 3 on the oil inlet hydraulic pipeline of the two-way variable pump / motor 6, and the oil outlet of the two-way variable pump / motor 6 is connected to the oil inlet hydraulic pipeline of the internal combustion engine / motor 2), and the power accumulator 3 and the recovery accumulator 10 are both connected through the hydraulic pipeline 4; the two-way variable pump / motor 6 is rigidly connected to the reduction mechanism 8, and the driving wheel 9 is installed on the reduction mechanism 8 through the wheel drive assembly 7.

[0019] Specifically, the internal combustion engine assembly 1, the internal combustion engine pump / motor 2, the two-way variable pump / motor 6, the speed reduction mechanism 8, the wheel drive assembly 7, and the running wheel 9 are connected in series. The internal combustion engine assembly 1 is rigidly mechanically connected to the internal combustion engine pump / motor 2. The internal combustion engine pump / motor 2 starts the internal combustion engine assembly 1. The power generated by the internal combustion engine assembly 1 can also directly drive the internal combustion engine pump / motor 2 to operate. The internal combustion engine pump / motor 2 converts mechanical energy into pressure energy, which can charge the power accumulator 3 and can also directly drive the two-way variable pump / motor 6 to work. The internal combustion engine pump / motor 2, the power accumulator 3, the two-way variable pump / motor 6 and the connected hydraulic pipeline 4 are a hydraulic drive system. The two-way variable pump / motor 6 then transmits the driving force to the speed reduction mechanism 8, the wheel drive assembly 7, and the running wheel 9, thereby driving the vehicle to travel. The internal combustion engine pump / motor 2, the recovery accumulator 10, and the bidirectional variable pump / motor 6 form an energy recovery system. When the vehicle is braking or decelerating, the kinetic energy of the running wheels 9 is transmitted to the wheel drive assembly 7, the deceleration mechanism 8, and the bidirectional variable pump / motor 6. At this time, the bidirectional variable pump / motor 6 working in the motor mode converts the mechanical energy transmitted from the running wheels 9 into pressure energy and stores it in the recovery accumulator 10.

[0020] Specifically, the intelligent control module component 5 is connected with the internal combustion engine assembly 1, the internal combustion engine pump / motor 2, the two-way variable pump / motor 6, and the reduction mechanism 7 for electrical signal transmission. The control signals of the intelligent control module component 5 include: the power of the internal combustion engine assembly 1, the output power of the internal combustion engine pump / motor 2, the required power of the two-way variable pump / motor 6, and the required torque of the reduction mechanism 8. As the command center of the entire power system, it is responsible for the safe, reliable, efficient, and energy-saving operation of the entire vehicle. It can set three working modes: Mode 1: the power accumulator 3 independently drives the vehicle to travel or starts the internal combustion engine assembly 1; Mode 2: the power accumulator 3 and the internal combustion engine assembly 1 jointly drive the vehicle to travel; Mode 3: kinetic energy recovery, the vehicle braking kinetic energy enters the kinetic energy recovery condition of the recovery accumulator 10 or the power accumulator 3, and works with conventional braking at the same time to ensure safe driving.

[0021] Among them, mode one and mode two are more common and will not be described in detail here. Mode one, the independent drive of the power accumulator 3 has the following advantages: 1. It can improve the power acceleration and starting performance of the vehicle, which is mainly due to the advantage of the high power density of the power accumulator; 2. The fuel consumption in medium and low-speed heavy-duty vehicles is a relatively high working condition. By using the power accumulator 3 to drive the vehicle, the internal combustion engine assembly 1 can be in an idle or shutdown state, which is very beneficial to the improvement of fuel economy. Mode two, the power accumulator 3 and the internal combustion engine assembly 1 jointly drive the vehicle. The high power density of the power accumulator 3 and the high energy density of the internal combustion engine assembly 1 can release higher power in an instant, improve the power of the vehicle under heavy load, and drive the vehicle under heavy load, steep slope, rapid acceleration and other heavy load conditions.

[0022] Mode 3: Kinetic energy recovery. Figure 2 As shown, the vehicle state is determined by the intelligent control component 5. When the vehicle is in a braking condition, the internal combustion engine assembly 1 is stopped or idling. In the previous driving condition, the energy of the power accumulator 3 or the recovery accumulator 10 is almost released, and the driving wheel 9 is in a deceleration state. The deceleration kinetic energy is transmitted to the deceleration mechanism 8 through the wheel drive component 7. At this time, the two-way variable pump / motor 6 works in the motor mode, converting the mechanical energy (kinetic energy transmitted from the driving wheel) into hydraulic energy. The converted hydraulic energy will be stored in the power accumulator 3 or the recovery accumulator 10. When the system needs it, the power accumulator 3 or the recovery accumulator 10 will release the stored hydraulic energy to replenish the system, which can be used for the start of the internal combustion engine assembly 1 or drive the vehicle in mode 1 and mode 2. The recovery of the braking energy can improve the fuel economy of heavy vehicles, save fuel consumption in the starting condition with a low air-fuel ratio, and is conducive to the improvement of fuel economy. At the same time, it can play a role in balancing and stabilizing the pressure in the entire hydraulic circuit.

[0023] A novel series heavy-duty liquid-driven hybrid vehicle comprises the novel series heavy-duty liquid-driven hybrid system.

[0024] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above, and any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel series heavy-duty liquid-driven hybrid power system, comprising an internal combustion engine assembly (1) and an internal combustion engine pump / motor (2) connected thereto, characterized in that: The internal combustion engine pump / motor (2) and the bidirectional variable displacement pump / motor (6) are bidirectionally connected via a hydraulic pipeline (4); a power accumulator (3) and a recovery accumulator (10) are respectively connected to the bidirectional hydraulic pipeline (4) between the internal combustion engine pump / motor (2) and the bidirectional variable displacement pump / motor (6), and both are connected via the hydraulic pipeline (4); the bidirectional variable displacement pump / motor (6) is drivingly connected to the travel wheels (9); The system further comprises an intelligent control module component (5), and the internal combustion engine assembly (1), the internal combustion engine pump / motor (2), and the bidirectional variable pump / motor (6) are electrically connected to the intelligent control module component.

2. A novel series heavy-duty liquid-driven hybrid power system according to claim 1, characterized in that: It also includes a reduction mechanism (8), wherein the reduction mechanism (8) is rigidly connected to the bidirectional variable displacement pump / motor (6), and the travel wheel (9) is mounted on the reduction mechanism (8) via a wheel drive assembly (7).

3. A novel series heavy-duty liquid-driven hybrid power system according to claim 2, characterized in that: The speed reduction mechanism (8) is electrically connected to the intelligent control module assembly (5).

4. A novel series heavy-duty liquid-driven hybrid power system according to claim 1, characterized in that: The hydraulic pipeline (4) is a high-pressure steel wire braided hose.

5. A new type of series heavy-duty liquid-driven hybrid vehicle, characterized in that: A novel series heavy-duty liquid-driven hybrid power system comprising any one of claims 1 to 3 above.

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