Electric vehicle hydraulic control pump/motor power assisting system

A technology for electric vehicles and hydraulically controlled pumps, applied in electric vehicles, electric braking systems, brakes, etc., can solve problems such as many fault links, high operating environment and maintenance requirements, and complex systems, and achieve fewer fault links and structure. Simple, low cost, low maintenance difficulty

Inactive Publication Date: 2014-07-30
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the hydraulic booster schemes all adopt electro-hydraulic control technology, which has the advantages of high degree of automation and convenient adjustment, but the disadvantage is that the system is complicated, there are many fault links, and it has high requirements for the use environment and maintenance

Method used

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  • Electric vehicle hydraulic control pump/motor power assisting system
  • Electric vehicle hydraulic control pump/motor power assisting system
  • Electric vehicle hydraulic control pump/motor power assisting system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The invention includes a pump / motor-accumulator main circuit, a booster control circuit and a brake control circuit.

[0025] like figure 1, the pump / motor-accumulator main circuit includes hydraulic pump / motor 5, high-pressure accumulator 9, low-pressure accumulator 10, overflow valve 6, electromagnetic reversing valve 7, hydraulic control proportional valve 4, hydraulic control Check valve 8, fixed orifice 11, throttle valve 12, shuttle valve 17. The transmission shaft of the hydraulic pump / motor 5 is connected with the motor 2 and the driving axle through the transfer box 3, and its oil inlet and outlet are respectively connected with the A and B oil ports of the electromagnetic reversing valve 7. The P and T oil ports of the electromagnetic reversing valve 7 are respectively connected with the high-pressure accumulator 9 and the low-pressure accumulator 10 . The overflow valve 6 is connected in parallel with the hydraulic pump / motor 5 . The hydraulic control chec...

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PUM

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Abstract

The invention discloses an electric vehicle hydraulic control pump/motor power assisting system, and belongs to the technical field of hydraulic transmission. The electric vehicle hydraulic control pump/motor power assisting system comprises a main loop consisting of a pump/motor (5) and energy accumulators (9) and (10), a power assisting control loop consisting of a hydraulic control proportioning valve (4) and a power assisting cylinder (20) and a brake control loop consisting of the hydraulic control proportioning valve and a brake cylinder (14). The pump/moor is meshed with an electric motor (2) and a drive axle through a power divider (3). During braking, a vehicle inertia driving pump is used for charging the energy accumulators, and the pump generates a braking torque for a vehicle. When the vehicle starts to run, the energy accumulators supply oil for the motor to assist the electric motor in driving, and the overloading of a power battery is prevented, thus the service life of the vehicle is prolonged. The output oil pressure of the hydraulic control proportioning valve can be controlled through a brake pedal (16) and an accelerator pedal (22), and the discharge capacity of the pump/motor is adjusted, thus the hydraulic brake and power assisting strength is controlled. The electric vehicle hydraulic control pump/motor power assisting system has the characteristic that full hydraulic control is adopted, and has the advantages of high environmental suitability and high reliability.

Description

technical field [0001] The invention relates to a hydraulically controlled pump / motor booster system for an electric vehicle, which belongs to the technical field of hydraulic transmission. Background technique [0002] In order to save energy and protect the environment, in recent years, new energy vehicles have become the strategic focus of the development of the automobile industry in various countries in the world. Among them, electric vehicles have attracted much attention as the main technical solution. At present, the main technical obstacle to the development of electric vehicles is the power storage battery technology. As the power source of a car, capacity is the most important performance indicator of a power battery. The capacity of a single battery is not a fixed number, it is related to the usage of the battery, especially the charge and discharge rate. Excessive charge and discharge rate will significantly reduce the battery capacity and cycle life. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/20B60T13/12
Inventor 吕云嵩丁左武邹政耀郭均政施明松
Owner NANJING INST OF TECH
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