Hydraulic hybrid power vehicle and hydraulic hybrid power system thereof

Abstract

The invention discloses a hydraulic hybrid power vehicle and a hydraulic hybrid power system thereof. The output shaft of an engine in the hydraulic hybrid power system is directly connected with an input shaft of a first transmission gear set, the first output shaft of the first transmission gear set is connected / disconnected with a first input end of a second transmission gear set through a clutch; a second output shaft of the first transmission gear set is connected with a driving shaft of a hydraulic pump, a hydraulic oil outlet of the hydraulic pump is connected / disconnected with a hydraulic pump / a motor through a direction control valve, and an output shaft of the hydraulic pump / the motor is connected with a second input shaft of the second transmission gear set; an output shaft of the second transmission gear set is connected with a drive axle of the hydraulic hybrid power vehicle; an outlet main oil path of the hydraulic pump is connected / disconnected with an oil inlet and an oil outlet of the hydraulic pump / the motor; an operating oil way of a high pressure energy accumulator is connected / disconnected with a main oil way through a switch valve so that hydraulic oil in the main oil path flows into the high pressure energy accumulator or the hydraulic oil in the high pressure energy accumulator flows into the main oil way. The power system is higher in reliability and higher in energy recovery ratio.

Description

technical field [0001] The invention relates to the technical field of vehicle hydraulic control, in particular to a hydraulic hybrid vehicle and a hydraulic hybrid system thereof. Background technique [0002] A hydraulic hybrid vehicle is a vehicle that is driven by hydraulic and mechanical configurations. It has been widely used in daily life, such as hydraulic hybrid drive loaders, bulldozers and other construction machinery vehicles. [0003] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a hydraulic hybrid power system of a hydraulic hybrid power vehicle in the prior art. [0004] The hydraulic hybrid power system in the prior art includes a hydraulic variable pump 1', a one-way valve 2', a central controller 3', a two-position two-way reversing valve 4', a high-pressure hydraulic accumulator 5', a brake 7', a planetary Gear train 8', transmission 9', engine 10', clutch 11', low-pressure hydraulic accumulator 12', hydraulic pump / motor 14...

AI Technical Summary

Problems solved by technology

[0009] It can be seen from the above description that when there is no pressure in the high-pressure accumulator, the pure hydraulic starting function at low speed will not be realized, seriously affecting the normal operation of the vehicle

Moreover, the system can only recover the mechanical energy of the wheel's rotational inertia

[0010] In addition, the braking energy recovered in the system can only be applied to the low-speed pure hydraulic starting function of the vehicle. When the recovered braking energy reaches the maximum capacity of the high-pressure accumulator, the excess energy cannot be applied to the working device of the construction machinery

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