Patent ID: 9731950
Date: 2017-08-15
CPC Classifications: B66F

Claim:
1. An apparatus for controlling a load handling device of an industrial vehicle including: a lift cylinder that is supplied with hydraulic oil at a flow rate determined by an operation amount of a lift lever as a load handling lever and lifts and lowers the load handling device at a lifting speed determined by the flow rate of hydraulic oil supplied to the lift cylinder; and a tilt cylinder that is supplied with hydraulic oil at a flow rate determined by an operation amount of a tilt lever as a load handling lever and tilts the load handling device at a tilting speed determined by the flow rate of hydraulic oil supplied to the tilt cylinder, the apparatus that controls the supply of hydraulic oil to the lift cylinder and the tilt cylinder comprising: a lifted height detector that detects a lifted height of the load handling device; a tilt angle detector that detects a tilt angle of the load handling device; a loading pump that pumps hydraulic oil from a hydraulic tank provided in the industrial vehicle and supplies the hydraulic oil to the lift cylinder and the tilt cylinder; a drive that drives the loading pump; and a controller configured to control the flow rate of hydraulic oil supplied to the lift cylinder and the tilt cylinder, the controller being configured to determine, in accordance with the forward tilt angle and the lifted height of the load handling device, a regulated flow rate of hydraulic oil supplied to the lift cylinder that is smaller than a flow rate based on a maximum operation amount of the lift lever, wherein when the forward tilt angle of the load handling device is greater than a first regulation tilt angle and the lifted height of the load handling device is higher than a predetermined reference height, the controller is configured to set the regulated flow rate as a maximum flow rate of hydraulic oil supplied to the lift cylinder and to regulate the flow rate of hydraulic oil supplied to the lift cylinder so that the flow rate of hydraulic oil supplied to the lift cylinder becomes equal to or smaller than the regulated flow rate so that the lifting speed of the load handling device is reduced.