JPH1096405A - Control system adapted to operate equipment of machine and operation method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control system to operate a flow control valve to move a fluid actuator by arranging an input part, an electronic control part, a pump and a fluid control part having a related valve. SOLUTION: A control system 10 contains an operator input control part 12, an electronic control part 14 and a fluid control part 16. The operator input control part 12 contains a first equipment lever 18 to raise and lower an equipment of a machine and a second equipment lever 20 to control heaping-up and loading/unloading of the equipment. In operation, the electronic control part 14 of the control system 10 regulates motion necessary in the fluid control part 16 to control the equipment of the machine. The electronic control part 14 contains a demand stage 26 to convert a movement of control levers 18 and 20 being operator input into desired equipment speed and pump pressure. The electronic control part 14 also contains a practice stage 28 to decide a necessary command to attain a desired result by receiving a demand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates generally to a control system and method of operation adapted for the equipment of a machine, and more particularly, to one of reversible fluid actuators by controlling an arranged valve. A control system having a request stage and an enforcement stage for controlling fluid flow to and from only one port.

[0002]

BACKGROUND OF THE INVENTION Control systems are typically used to control the movement of a fluid actuator.

[0003]

One of the problems encountered is developing a control system for operating a flow control valve to move a fluid actuator. Developing a system is difficult and time consuming, so all elements work together to achieve the desired result.

[0004] The present invention aims to solve the above problems.

[0005]

SUMMARY OF THE INVENTION In one aspect of the present invention, a control system for operating equipment of a machine is provided. The control system includes an input, an electronic control, and a fluid section having a pump and associated valves. The control system includes a required stage of electronics that converts the signal from the input to the desired brace speed and pump pressure. The implementation stage of the electronics determines the valve commands needed to achieve the desired appliance speed and pump pressure.

In another aspect of the invention, a method of operating a control system having an operator control input, an electronic control, and a fluid control having a pump, associated valves and actuators, the method comprising operating the operator control input. Sensing, converting the operator control input to a desired speed and pump pressure signal, sensing the desired speed and pump pressure signal, determining the valve command required to achieve the desired speed and pump pressure, and Controlling the valves in the fluid control to achieve the desired speed and pump pressure.

[0007]

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows an implement for a machine such as a bucket of a wheel loader (not shown).
FIG. 2 is a block diagram showing a control system 10 for controlling s). The control system 10 includes an operator input control unit 12, an electronic control unit 14, and a fluid control unit 16.

The operator input control unit 12 includes a first equipment lever 18 for raising and lowering the equipment of the machine and a second equipment lever 20 for controlling the racking and dumping of the equipment. Contains. The movement of the first orthosis lever 18 generates an electrical control signal 22 that is sent to the electronic control 14. Movement of the second orthosis lever 20 generates an electrical control signal 24 that is also sent to the electronic control 14. When the brace levers 18 and 20 lift and stack the brace, the control signals 22 and 24 are positive. Prosthetic levers 18 and 2
When zero moves down or unloads the brace, control signals 22 and 24 are negative.

Electronic control 14 may be a microprocessor 25 or other suitable system for controlling fluid control 16. The electronic control unit 14 includes a request stage 26 and an implementation stage 28. The control signal 22 from the first lever 18 is transmitted to the pressure map 30 in the demand stage 26,
It is sent to the logic map 32 and the modulation map 34. Control signal 24 from second lever 20
Are sent to pressure map 36, pressure map 38 and modulation map 40 in request stage 26. Maps 30-40 map operator input signals 22 and 24, e.g., one request for multiple desired appliance speed signals 42,44.
And 46, split into two separate requests so that the second request is a plurality of desired pressure signals 48, 50 and 52. Maps 30-40 are in the form of look-up tables that receive operator input signals 22 and 24, convert them to a desired appliance speed signal or pump pressure, and send that signal to implementation stage 28.

[0010] Implementation stage 28 determines which should be activated to meet the desired requirements. The implementation stage 28
A plurality of pressure maps and flow modulation maps 54-64 are included. The pressure map 54 is the input signal 4
8 to determine the required command and send a signal 66 to the limiter module 68. Flow modulation maps 56 and 58 receive input signal 44.
Map 56 sends signal 70 to limiter module 68. Limiter module 68 combines signals 66 and 70 and sends signal 72 to switch 74 and switch 75. Map 58 sends signal 76 to switches 78 and 79. Signal 44 also includes a switch 74,
Used to control the positions of 75, 78 and 79. Signal 42 is used to control the position of float control switch 80. The pressure signals 50 and 52 are sent to a selection module 82, which selects
The larger of the two signals 50 and 52 is selected and a select signal 84 is sent to map 60. Map 60 is signal 85
Is sent to the actuator 86. Flow modulation
Maps 63 and 64 receive input signal 46. Map 63 sends signal 87 to switches 88 and 89. Map 64 sends signal 90 to switches 91 and 92. Signal 46 also includes switches 88, 89,
Used to control the positions of 91 and 92. When the switch receives a positive signal, the switches 75, 7
9, 89 and 92 are connected to the respective signals, and the other switches 74, 78, 88 and 91 are connected to the ground 93. Switches 74, 7
5, 78, 79, 88, 89, 91, and 92 have respective actuators 94, 96, 98, 100, 10,
2, 104, 106 and 108 can be connected.

The fluid control section 16 includes a supply pump 110. Line 112 bypasses feed pump 110
Connected to valve 114. The signal 93 from the actuator 86 is connected to a bypass valve 114 for controlling the pressure in the fluid control. Line 112 also connects supply pump 110 to a plurality of independently operable solenoid displacement controlled flow metering spool valves 1.
16a, 116b, 116c and 116d. Valve 116 a is connected to rod end chamber 118 of fluid actuator 120, and valve 116 b is connected to head end chamber 122 of fluid actuator 120. Valve 116c
Is connected to the rod end chamber 124 of the fluid actuator 126, and the valve 116 d is connected to the head end chamber 128 of the fluid actuator 126. Other plurality of independently operable solenoid displacement controlled flow metering spool valves 116
e, 116f, 116g, and 116h are located between the fluid actuators 120, 126 and the tank 129. The valve 116e is connected to the fluid actuator 12
0 is connected to the head end chamber 122, and the valve 116 f is connected to the rod end chamber 118 of the fluid actuator 120. Valve 116 g is connected to the head end chamber 128 of fluid actuator 126, and valve 116 h is connected to rod end chamber 248 of fluid actuator 126. Spool valve 116a,
116b, 116c, 116d control the fluid flow to the driving chamber from the pump to the cylinder, and the spool valves 116e, 116f, 116g, 116h control the flow of fluid from the chamber to the driving tank to the tank. I do. Spool valve 116a, 1
16b, 116c, 116d, 116e, 116f, 1
Each of 16g and 116h is a respective actuator 9
4, 96, 102, 104, 98, 106, 108. Spool valve 116f is float
The switch 80 can be connected to the actuator 100. Valves 116a, 116b, 116e, 116f
Is controlled to extend the fluid actuator 120 to lift the brace, and controlled to retract the actuator 120 to lower the brace. Valves 116c, 116d, 116
g, 116h are controlled to release actuator 126 for stacking of the brace, and are controlled to actuate actuator 126 to unload the brace.

Spool valves 116a, 116b, 1
16c, 116d, 116e, 116f, 116g, 1
Each of 16h describes in detail only spool valve 116a, but is substantially equivalent, with the common reference number followed by the appropriate letter common to all elements of the spool valve. Each of the spool valves includes a solenoid driven valve spool 130a having opposing ends 132a and 134a. End 13
The solenoid 136a on 2a is connected to a respective actuator such as 94. Spring 138a
Is disposed at the end 134a facing the solenoid 136a. This spring 138a normally biases the valve spool 130a to a neutral or de-energized position.
The spool valve is shown in a neutral position when control levers 18 and 20 are in a central position.

In operation, the electronics 14 of the control system 10 define the movement required in the fluid section 16 to control the equipment of the machine. The electronics 14 includes a request stage 26 that converts the movement of the control levers 18 and 20, which are operator inputs, to the desired brace speed and pump pressure. The electronics further includes an implementation stage 28 that receives the request and determines the commands required to achieve the desired result.

To raise the brace, the operator moves the control lever 18 in the forward direction to generate an input signal 22. Input signal 22 is mapped to map 3 in request stage 26 to convert signal 22 to a desired appliance speed or pump pressure.
0, 32, 34. The request signals 44 and 50 are then passed to an implementation stage to determine what signals and values are needed to meet the desired requirements. Signal 44 is sent to maps 56 and 58 which determine what commands are needed to satisfy the request. Signal 44 is also sent to switches 74, 75, 78, 79, which actuate the switches to cause signals 72 and 76 to be applied to actuator 1
Valves 116a, 116 required to operate 20
b, 116e, 116f connected to the actuators 94, 96, 98, 100 needed to drive them.
Signal 42 is sent to float switch 80 to connect actuator 100 to valve 116f when needed.
Since the fluid flow from the pump to the cylinder and from the cylinder to the tank can be individually controlled by valves, accurate control of the actuator 120 is possible under virtually all operating conditions of the actuator 120. In particular, when the actuator operates, accurate control is achieved by controlling the flow from the pump to the cylinder. Conversely, when the actuator is released, precise control is achieved by controlling the flow from the cylinder to the tank. Any number of valves can be controlled to achieve the desired result. Signals 84 are sent to map 60, which determines the fluid system pressure required to achieve the desired demand and controls actuator 86 for opening and closing bypass valve 114 to control the pressure. The signal 85 is sent.

It is clear from the above description that the control system has two stages separated from each other. The stages can be designed independently and then combined to improve development time, reduce cost and improve performance. Other aspects, objects, and advantages of the invention can be obtained from a study of the drawings, the disclosure, and the appended claims.

[Brief description of the drawings]

FIG. 1 shows a schematic flow diagram and a fluid system of the present invention.

[Explanation of symbols]

Reference Signs List 10 control system 12 operator input control unit 14 electronic control unit 16 fluid control unit 26 request stage 28 execution stage 30, 32, 34, 36, 38, 40 map 54, 56, 58, 60, 63, 64: map 110: pump 116a to 116h: solenoid displacement control metering spool valve 129: tank

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor John Jay. Clone United States, Illinois 61525, Dunlap, Brentwood 1409 (72) Inventor James A. Ardema United States, Illinois 60544, Plainfield, Simo Drive 24055

Claims (8)

[Claims] An input, an electronics, a fluid having a pump, associated valves and actuators, and a request stage of the electronics for converting a signal from the input to a desired brace speed and pump pressure. A control system adapted to operate equipment of a machine comprising: an implementation stage of said electronics, which determines a valve command required to achieve a desired equipment speed and pump pressure. 2. The control system according to claim 1, wherein said requesting stage includes a plurality of control maps for converting input signals to a desired appliance speed and pump pressure. 3. The control system according to claim 1, wherein the implementation stage includes a plurality of control maps for controlling a valve for moving the actuator. 4. The control system according to claim 1, wherein said electronics includes an actuator selectively connectable to a signal from said implementation stage for controlling a valve. 5. The control system of claim 4, wherein the fluid valve is an independently operable solenoid displacement control flow metering spool valve connected to the actuator. 6. The fluid section according to claim 1, wherein the fluid section includes a bypass valve disposed between the pump and a tank.
The control system as described. 7. The control system according to claim 6, wherein said bypass valve is controlled by said implementation stage of said electronics. 8. A method of operating a control system having an operator control input, an electronic control, and a fluid having pumps, associated valves and actuators, the method comprising: controlling the electronic control. Detects the operator control input signal using and converts the operator control input to the desired speed and pump pressure signal, senses the desired speed and pump pressure signal, and provides the necessary valves to achieve the desired speed and pump pressure A method of operating a control system comprising the steps of determining a command and controlling a valve in the fluid control to achieve a desired speed and pump pressure.