Study on the Effect of Hydraulic Energy Storage on the Performance of Electro-Mechanical-Hydraulic Power-Coupled Electric Vehicles
Abstract
:1. Background and Significance
1.1. Introduction
1.2. Contribution of This Paper
- Analysis of the structure and operating principle of the EMHCEV;
- Establishing the mathematical modeling of the hydraulic accumulator;
- Completion of the simulation of the whole vehicle and the hydraulic accumulator based on AME Sim;
- Analysis of the hydraulic energy accumulator dynamic whole-vehicle performance and hydraulic power participation behavior.
2. Structure and Working Principle of an Electro-Hydraulic Coupling Electric Vehicle
2.1. The Structure of Electro-Hydraulic Coupling Electric Vehicle
2.2. The Working Principle of Electro-Hydraulic Coupling Electric Vehicle
- Parking energy storage: hydraulic power drives the vehicle to start. When the pressure in the hydraulic accumulator is higher than the minimum working pressure of the hydraulic accumulator, then the high-pressure oil in the high-pressure accumulator flows to the low-pressure accumulator through the hydraulic pump/motor, converting the hydraulic energy stored in the hydraulic accumulator into mechanical energy.
- Vehicle acceleration: electric power and hydraulic power coupling output energy together to drive the vehicle. The mechanical energy generated when the vehicle is going downhill or braking is first converted into hydraulic energy by the electromechanical-hydraulic coupler and then recovered and stored in the high-pressure accumulator. When the energy is rich, then the electric motor will convert it into electric energy and recover and store it in the battery pack, thereby improving the efficiency of energy recovery.
- When the vehicle is running at a constant speed: The vehicle is judged according to the actual situation of the working pressure in the hydraulic accumulator. When using hydraulic energy to start the vehicle, the high-pressure fluid in the high-pressure accumulator pushes the hydraulic pump/motor to rotate, converting the hydraulic energy stored in the hydraulic accumulator into mechanical energy and driving the vehicle to start. When uniform speed is reached, the battery pack starts to provide electric energy to the electric motor, and the vehicle is driven by electric power to drive.
- When the vehicle climbs/accelerates: After the vehicle starts, the electric power drives the vehicle into acceleration mode. At this time, the electric energy is converted into mechanical energy through the electric motor, which works simultaneously with the hydraulic power. The two are superimposed in the electromechanical-hydraulic coupling for torque to drive the vehicle at a higher speed.
- When decelerating and braking: The vehicle’s electric motor is used as a generator and the vehicle coasts forward under the action of inertia force. The braking energy is converted into hydraulic energy in the electromechanical-hydraulic coupler and stored in the high-pressure accumulator. At the same time, the electric motor starts to work, converting mechanical energy into electrical energy, which is stored in the battery pack through the power converter.
3. Accumulator Selection
4. Mathematical Modeling
4.1. Hydraulic Accumulator
- Determination of the minimum working pressure P1
- 2.
- Determination of the maximum working pressure P2
- 3.
- Determination of inflation pressure P0
- 4.
- Determination of accumulator volume v0
4.2. Hydraulic Pump/Motor Matching
- Maximum power of hydraulic pump/motor
- 2.
- Maximum torque of hydraulic power
4.3. Electric Motors
- The equations for the mechanical power Pmec and power loss Plost of the motor are
- 2.
- Motor/generator efficiency
4.4. Battery
- The power required to drive the vehicle at a constant speed in purely electric mode is
- 2.
- The energy required to travel a certain distance S over an equal distance is
- 3.
- The stored energy of the battery required for electric vehicles is
- 4.
- The power cell pack energy constraint is
5. Simulation Analysis
5.1. Simulation Methodology
5.2. Determination of Energy Storage Capacity
5.3. Speed Following
5.4. Hydraulic Power Involvement
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Categories | Features |
---|---|
Spring Type | The spring-type accumulator converts the oil compression spring into elastic potential energy for energy storage. His structure is simple and low-cost. However, the spring has limited expansion and contraction, and the spring reacts slowly to the pressure action. This kind of accumulator is only suitable for low-pressure systems with small capacity and is mostly used as a buffer device. |
Weighted | The weighted accumulator uses a mass block on a piston to convert pressure energy into gravitational potential energy. It has a simple structure and stable pressure but has a large installation limitation and can only be installed vertically. It uses a mass block with high inertia. This accumulator has low sensitivity. It is difficult to seal and is only used for temporary energy storage. |
Contact | A contact-type accumulator has direct contact between oil and gas. This kind of accumulator is responsive, but the oil and gas are mixed, and the oil utilization rate is low. |
Piston type | The piston accumulator separates the oil from the gas utilizing a piston. This ensures that the oil is not oxidized. The accumulator has a long service life, but the friction that exists between the piston and the inner wall makes it less sensitive. This type of accumulator can be used to adjust the system pressure. |
Diaphragm type | The diaphragm-type accumulator separates the oil from the inert gas by means of a rubber diaphragm. The elasticity of rubber effectively increases the sensitivity of this type of accumulator. This type of accumulator has a limited filling pressure because of its small capacity and can be used to absorb shock pulsations. |
Bladder type | The bladder type accumulator uses a bladder to separate the oil from the gas. The capsule is filled with an inert gas (e.g., nitrogen) and the oil is filled outside the capsule. The bladder-type accumulator achieves the discharge of oil through the compressibility of the inert gas. This kind of accumulator has the advantages of small inertia, responsiveness, and good sealing, and its overall structure has various sizes and specifications and is easy to install and maintain. This is also the most widely used accumulator. |
Parameter (Unit) | Numerical Value |
---|---|
Overall vehicle mass m (kg) | 1206 |
Rolling resistance coefficient f | 0.0135 |
Air resistance coefficient CD | 0.32 |
Windward area A (m2) | 2.28 |
Rotating mass conversion factor δ | 1.05 |
Mechanical drive efficiency η | 0.85 |
Tire width R (mm) | 290 |
Secondary Component Displacement Vp (mL·r−1) | 30 |
Motor traction power Pe (KW) | 32 |
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Chen, Y.; Zhang, T.; Zhang, H.; Zhang, Z.; Jia, Q.; Chen, H.; Xu, H.; Zhang, Y. Study on the Effect of Hydraulic Energy Storage on the Performance of Electro-Mechanical-Hydraulic Power-Coupled Electric Vehicles. Electronics 2022, 11, 3344. https://doi.org/10.3390/electronics11203344
Chen Y, Zhang T, Zhang H, Zhang Z, Jia Q, Chen H, Xu H, Zhang Y. Study on the Effect of Hydraulic Energy Storage on the Performance of Electro-Mechanical-Hydraulic Power-Coupled Electric Vehicles. Electronics. 2022; 11(20):3344. https://doi.org/10.3390/electronics11203344
Chicago/Turabian StyleChen, Yihui, Tiezhu Zhang, Hongxin Zhang, Zhen Zhang, Qingxiao Jia, Hao Chen, Haigang Xu, and Yanjun Zhang. 2022. "Study on the Effect of Hydraulic Energy Storage on the Performance of Electro-Mechanical-Hydraulic Power-Coupled Electric Vehicles" Electronics 11, no. 20: 3344. https://doi.org/10.3390/electronics11203344
APA StyleChen, Y., Zhang, T., Zhang, H., Zhang, Z., Jia, Q., Chen, H., Xu, H., & Zhang, Y. (2022). Study on the Effect of Hydraulic Energy Storage on the Performance of Electro-Mechanical-Hydraulic Power-Coupled Electric Vehicles. Electronics, 11(20), 3344. https://doi.org/10.3390/electronics11203344