Forklift active braking control method and system based on power shift transmission

A forklift active braking control method based on power shift transmission, wherein the power shift transmission comprises a forward gear clutch controlled by a forward gear proportional solenoid valve and a reverse gear clutch controlled by a reverse gear proportional solenoid valve, comprising the following steps:

• step 1:
• obtaining forklift state parameters, and determining a current state of a forklift according to the forklift state parameters, wherein if the current state of the forklift is an active braking state, performing step 2;
• step 2:
• obtaining forklift speed-duty ratio relationship, inputting a current speed signal of the forklift, and according to the forklift speed-duty ratio relationship, obtaining duty ratio parameters that cause a braking deceleration of the forklift to be within a preset range and can produce a maximum braking force at the current speed, and outputting proportional solenoid valve control parameters of the forward gear proportional solenoid valve or the reverse gear proportional solenoid valve of the power shift transmission according to the obtained duty ratio parameters;
• step 3:
• using the proportional solenoid valve control parameters generated in step 2 to control the forward gear proportional solenoid valve or the reverse gear proportional solenoid valve of the power shift transmission to take action, to engage the reverse gear clutch when the forklift is in a forward gear, or to engage the forward gear clutch when the forklift is in a reverse gear, thereby controlling a forklift power system to output a driving force opposite to a current movement direction of the forklift to drive the forklift to actively brake;
• and
• step 4:
• exiting active braking of the forklift when a forklift speed is detected to be zero.