LOW IDLE CONTROL SYSTEM OF CONSTRUCTION EQUIPMENT AND AUTOMATIC CONTROL METHOD THEREOF

• US 20130289834A1
• Filed: 12/21/2011
• Published: 10/31/2013
• Est. Priority Date: 12/21/2010
• Status: Abandoned Application

• Current Assignee: Doosan Infracore Company Limited
• Original Assignee: Doosan Infracore Company Limited
• Inventors: Park, Kwang Seok, Kim, Sung Il, Jeong, Hee Jun
• Application Number:
  US13/994,538
• Publication Number:
  US 20130289834A1
• Time in Patent Office: Days
• US Class Current: 701/50
• CPC Class Codes: E02F 9/2066 of the type combustion engines
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/083 taking into account engine load variation, e.g. air-conditionning

Abstract

The present disclosure discloses a low idle control system of construction equipment and an automatic control method thereof. The low idle control system of construction equipment includes: a front angle change sensing means which detects an operation of at least a part of a front unit through changes in an angle; a controller which is electrically connected to the front angle change sensing means, determines whether to enter an auto idle state by receiving an output signal that is transmitted from the front angle change sensing means, and generates an rpm control signal corresponding to the result of the determination on whether to enter the auto idle state; and an ECU which controls the rpm of an engine by receiving the rpm control signal outputted from the controller. The present disclosure is capable of implementing an effective auto idle function by more accurately recognizing a state of using equipment.

Claims

1. A low idle control system of construction equipment, comprising:

a front angle change sensing means which detects an operation of at least a part of a front unit through changes in an angle;

a controller which is electrically connected to the front angle change sensing means, determines whether to enter an auto idle state by receiving an output signal that is transmitted from the front angle change sensing means, and generates an rpm control signal corresponding to the result of the determination on whether to enter the auto idle state; and

an ECU which controls the rpm of an engine by receiving the rpm control signal outputted from the controller.

2. The low idle control system of construction equipment of claim 1, wherein the front angle change sensing means includes at least one of a boom angle sensor which is installed at an upper turning unit and detects a change in an angle of a boom, an arm angle sensor which is installed at the boom and detects a change in an angle of an arm, and a bucket angle sensor which is installed at the arm and detects a change in an angle of a bucket.

3. The low idle control system of construction equipment of claim 1, further comprising:

an accelerator pedal sensor which detects operating pressure of an accelerator pedal or a change in an angle of the accelerator pedal; and

a steering sensor which detects a change in an angle or operating pressure of a steering wheel or a steering joystick,

wherein the controller additionally considers signals outputted from the accelerator pedal sensor and the steering sensor, at the time of determining whether to enter the auto idle state.

4. The low idle control system of construction equipment of claim 1, further comprising:

a working oil pressure sensor which detects pilot pressure that is generated corresponding to pressure of working oil supplied to drive a working device of the front unit, or an operation of an operating lever for operating the front unit,

wherein the controller additionally considers a signal outputted from the working oil pressure sensor, at the time of determining whether to enter the auto idle state.

5. An automatic control method of a low idle control system of construction equipment, comprising:

monitoring output signals that are received from a steering sensor, an accelerator pedal sensor, and a front angle change sensing means;

determining whether a preset output signal corresponding to a steering pressure reference value or less from the steering sensor, an off signal from the accelerator pedal sensor, and an off signal from the front angle change sensing means are continued for a predetermined time or more;

entering an auto idle mode by recognizing that the equipment does not work when it is determined that the condition is continued for a predetermined time or more according to the determination result of step; and

outputting normal rpm by inputting a preset control signal into the ECU, which controls the engine, when it is determined that the condition is not satisfied according to the determination result.

6. The automatic control method of a low idle control system of construction equipment of claim 5, further comprising:

determining, after entering the auto idle mode, whether at least one of a preset output signal corresponding to a steering pressure reference value or more from the steering sensor, an operating signal from the accelerator pedal sensor, and an operating signal from the front angle change sensing means is received,

wherein when it is determined that at least a signal of the signals is received according to the determination result, a preset control signal is inputted into the ECU, which controls the engine, and normal rpm is outputted.