Patent ID: 11919759
Assignee: ANHUI WEIDE POWER SUPPLY CO.,LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B  F  H  Y | IPC B  F  H

Claim 0:
1. A liquid-cooled integrative power system for electric forklift, comprising an integrated transmission gearbox, a drive motor, an oil pump motor, an integrated motor controller, an oil pump and a vehicle controller;
the integrated transmission gearbox comprising a drive motor transmission mechanism and an oil pump motor transmission mechanism; the drive motor transmission mechanism being arranged inside the integrated transmission gearbox, the drive motor transmission mechanism comprising a plurality of sets of gear shafts arranged in parallel, mating gears on each set of gear shafts engaging with each other, a first input gear shaft being provided with a first spline, a first output gear shaft being provided with a differential, and each of the gear shafts of the drive motor transmission mechanism being arranged on a housing of the integrated transmission gearbox through a bearing; the oil pump motor transmission mechanism being arranged inside the integrated transmission gearbox, the oil pump motor transmission mechanism comprising a plurality of sets of gear shafts arranged in parallel, mating gears on each set of gear shafts engaging with each other, a second input gear shaft and a second output gear shaft being respectively provided with a second spline and a third spline, and each gear shaft of the oil pump motor transmission mechanism being arranged on the housing of the integrated transmission gearbox through a bearing;
the drive motor being fixed to a lateral side of the integrated transmission gearbox through a mounting bolt on a rear cover of the motor, and an output shaft of the drive motor being connected, through a spline, to the first spline on the first input gear shaft on the drive motor transmission mechanism;
the oil pump motor being fixed to a lateral side of the integrated transmission gearbox through a mounting bolt on a rear cover of the motor, and an output shaft of the oil pump motor being connected, through a spline, to the second spline on the second input gear shaft on the oil pump motor transmission mechanism;
the integrated motor controller being fixedly mounted to an upper side of the drive motor, the oil pump motor and the integrated transmission gearbox;
the oil pump being fixedly mounted to a lateral side of the integrated transmission gearbox, and an input shaft of the oil pump being connected, through a spline, to the third spline on the second output gear shaft on the oil pump motor transmission mechanism; and
the vehicle controller being fixedly mounted to an upper cover of the integrated motor controller, and the vehicle controller being electrically connected to the integrated motor controller by wire harness; and the vehicle controller performing a coordinated control on the integrative power system by receiving operation signals and power battery pack states and request signals of the forklift, a specific control method comprising the following steps:
step 1: receiving, with the vehicle controller, a drive demand signal, a hydraulic operation demand signal, a status of battery pack management system and request signal, and other information from the forklift; the drive demand signal comprising an accelerator pedal signal, a brake pedal signal, a gear switch signal and other information; the hydraulic operation demand signal comprising a lift potentiometer signal, a tilt switch signal, a related equipment signal and other information; the status of battery pack management system and request signal comprising battery state information, temperature information, current and voltage information, discharge rate permission information, and other bus information for a battery pack;
step 2: processing, with the vehicle controller, the drive demand signal, the hydraulic operation demand signal, the status of battery pack management system and request signal, and other information from the forklift, processing the information about the drive demand signal and the hydraulic operation demand signal received from the forklift according to the status of battery pack management system and request signal and other information, and supplying required power to a drive and hydraulic power system based on demand and quantity; outputting, with the vehicle controller, a drive control instruction and a hydraulic control instruction respectively to the integrated motor controller through a low-voltage power supply and a control wire harness according to operating and working states of the forklift, and then performing a coordinated control on a drive motor controller and an oil pump motor controller for current output; and
step 3: controlling, with the drive motor controller, the drive motor through a high-voltage connection and a low-voltage connection between the drive motor and the drive motor controller arranged inside a housing of the integrated motor controller; controlling, with the oil pump motor controller, the oil pump motor through a high-voltage connection and a low-voltage connection between the oil pump motor and the oil pump motor controller arranged inside the housing of the integrated motor controller; outputting externally power of the drive motor, as drive power, through the drive motor transmission mechanism, outputting power of the oil pump motor to the oil pump through the oil pump motor transmission mechanism, and outputting, with the oil pump, a high-pressure oil source to a hydraulic operating system; and finally, realizing drive operation and hydraulic steering of the electric forklift and work actions of the electric forklift executed based on hydraulic transmission.