Electro-hydraulic compound brake system for recovering braking energy of electric fork-lift

Abstract

The invention relates to an electro-hydraulic compound brake system for recovering the braking energy of an electric fork-lift. The system comprises a suction filter, wherein the oil inlet of the suction filter extends into oil in a hydraulic oil tank, and the oil outlet of the suction filter is communicated with the oil inlet of a gear pump; the oil outlet of the gear pump is respectively communicated with the oil inlet of an overflow valve and the oil inlet of a one-way valve; the oil outlet of the overflow valve is respectively communicated with an oil return opening T1 of a three-position three-way full-hydraulic power brake valve and the hydraulic oil tank; the oil outlet of the one-way valve is respectively communicated with an energy accumulator and the oil inlet P1 of the three-position three-way full-hydraulic power brake valve; the oil outlet of the three-position three-way full-hydraulic power brake valve is connected with a service braking device; and a pedal angle sensor is connected with the brake pedal rotating shaft of the three-position three-way full-hydraulic power brake valve through a coupler. The electro-hydraulic compound brake system realizes maximized regenerating braking energyrecovery by coordinated control of electro-braking and hydraulic braking, so that braking safety is guaranteed, and energy utilization is improved.

Description

technical field [0001] The invention belongs to the technical field of forklift braking, and in particular relates to an electro-hydraulic composite braking system for recovering braking energy of an electric forklift. Background technique [0002] At present, most battery forklifts realize regenerative braking by releasing the accelerator pedal, and at the same time perform braking energy recovery. Since the accelerator pedal releases the braking strength setting is weak, it is used for regular deceleration and light braking during driving, and the braking torque Small, less recoverable energy. If the electric braking strength of the accelerator pedal release brake is strengthened, the braking deceleration will be too large, and the braking feeling will be uncomfortable. [0003] The service braking of some small-tonnage battery forklifts adopts full-motor braking. Although high-intensity braking can be achieved by setting regenerative braking parameters to meet the requir...

AI Technical Summary

Problems solved by technology

If the electric braking intensity of the accelerator pedal release brake is strengthened, the braking deceleration is too large, and the braking feeling is uncomfortable

[0003] The service braking of some small-tonnage battery forklifts adopts full-motor braking. Although high-intensity braking can be achieved by setting regenerative braking parameters to meet the requirements of safe braking distance, compared with releasing the brake with the accelerator pedal, it recovers more energy. , but if the large-tonnage four-wheel counterbalanced battery forklift uses full motor braking, because there is no participation of hydraulic brakes, once the electric brake fails, the braking safety of the vehicle cannot be guaranteed; the large-tonnage four-wheel counterbalanced battery forklift The service brake adopts full hydraulic brake. Frequent use of the brake will cause wear and heat of the friction pair. If used for a long time, the braking performance will decrease and the life of the brake will be shortened.

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