Patent ID: 9562345
Date: 2017-02-07
CPC Classifications: E02F,F15B

Claim:
1. A traveling control method for a construction machine including first and second hydraulic pumps, a left traveling control valve installed in a discharge flow path of the first hydraulic pump, a right traveling control valve installed in a discharge flow path of the second hydraulic pump, a first working device control valve installed in a parallel flow path of the first hydraulic pump, a second working device control valve installed in a parallel flow path of the second hydraulic pump, a traveling switching valve switched when traveling and working devices are simultaneously operated to distribute and supply hydraulic fluid from the first hydraulic pump to a left traveling motor and a right traveling motor and to distribute and supply hydraulic fluid from the second hydraulic pump to the first working device control valve and the second working device control valve so as to prevent eccentric traveling, an electronic valve switching the traveling switching valve, and a controller controlling the electronic valve, the traveling control method comprising: a first step of inputting a set value of a delay time of a traveling switching function of the traveling switching valve; a second step of inputting in real time an operation signal value according to a user's operation of a joystick and a traveling pedal; a third step of determining whether to operate the traveling and working devices according to the operation of the traveling pedal and the joystick; a fourth step of switching the traveling switching valve to a traveling switching mode through control of the electronic valve and returning to the second step repeatedly when the traveling pedal and the joystick are simultaneously operated; a fifth step of determining whether the traveling pedal is operated and the operation of the joystick is temporarily stopped for a predetermined time; a sixth step of determining whether the set value of the delay time of the traveling switching function is larger than an initially set time required and switching the traveling switching valve to the traveling switching mode if the set value is relatively larger than the initially set time; and a seventh step of releasing the traveling switching mode of the traveling switching valve through control of the electronic valve and repeating returning to the second step in the case where the traveling pedal is not initially operated, in the case where the traveling pedal is operated and the joystick operation has been stopped over the predetermined time, or in the case where the initially set time required is larger than the set value of the delay time.