KR100727625B1 - Control circuit for rpm of engine using rotary encoder and method therefor - Google Patents

Abstract

A circuit for controlling an RPM(Revolution Per Minute) of an engine by using a rotary encoder and a method thereof are provided to enable more precise and accurate control in comparison with an analog control circuit. A circuit for controlling an RPM of an engine by using a rotary encoder(10) includes an encoder controller(20) and a valve ECU(Electronic Control Unit)(30). The rotary encoder is connected to a control lever of an engine RPM controller by a shaft, generates an encoder output signal according to a rotating angle of the encoder shaft by rotating the encoder shaft with the rotation of the control lever. The encoder controller receives the encoder output signal from the rotary encoder and outputs a pulse width modulation signal having a duty rate, changed according to the encoder output signal. The valve ECU receives the pulse width modulation signal outputted from the encoder controller, generates a voltage output proportional to the duty rate of the inputted pulse width modulation signal for controlling opening/closing operations of a valve device attached to the engine or an oil pressure gauge.

Description

Control circuit for RPM of engine using rotary encoder and method therefor}

1 is a block diagram of the engine speed control circuit of the present invention;

2 is a flowchart showing the engine speed control method of the present invention.

Explanation of symbols on the main parts of the drawings

10; Rotary encoder 20; Encoder control unit

30; Valve ECU 35; Valve means

40; A power supply unit 50; Constant voltage

60; LED driver 65; LED

The present invention relates to an engine speed control circuit using a rotary encoder and a method thereof, and more particularly, engine rotation, which digitally controls the engine speed of a heavy-duty vehicle such as a fork lane and a bulldozer using a rotary encoder. It relates to a male control circuit and a method thereof.

In general, a portion of an arm, a bucket, a boom, or the like of a heavy equipment such as a fork crane, a bulldozer, or the like may be rotated or reciprocated by power or hydraulic pressure transmitted from an engine system of the heavy equipment.

At this time, the heavy-duty driver can adjust the speed of movement of these moving parts by using the engine speed controller attached to the driver's seat, which is attached to the engine system or hydraulic system associated with the moving parts, and the amount of fuel or hydraulic pressure applied to the engine or hydraulic system. The opening and closing of the valve means, such as choke valves or solenoid valves, which control the amount, is controlled.The opening and closing control of these valve means is a valve ECU (Electronic Control Unit) installed in the vehicle control system. It is common to control electronically through.

As a method of adjusting the engine speed as described above, a rotary type variable resistance (volume) in which a shaft is rotated in accordance with the rotation of the adjustment knob is conventionally attached to the shaft by the control knob of the engine speed controller, and the driver Turning the knob adjusts the resistance value of the variable resistor, and connects the changed resistance value to the voltage branch circuit to generate an output voltage value of approximately 0.5V to 4.5V, and converts the output voltage value to analog / digital conversion (A / D convert to the valve ECU, the valve ECU has been controlled to control the opening and closing of the associated valve according to the output voltage value.

However, the method using the variable resistor as described above requires the addition of a compensation circuit capable of compensating for chattering that may occur when the variable resistor value changes, depending on the mechanical characteristics of the variable resistor. Since the resistance value does not change constantly, the accuracy of adjustment is reduced, and there is a problem that the manufacturing cost of the device increases when a high precision variable resistor is used to improve this.

The present invention was devised to solve the above-mentioned conventional problems, and by using a rotary encoder instead of the conventional variable resistor, the rotary chatter phenomenon can be eliminated, the precision of the mechanism can be improved, and the manufacturing cost can be reduced. There is a technical problem to provide an engine speed control circuit using an encoder and a method thereof.

The configuration of the present invention for achieving the above object, the shaft is coupled to the adjustment knob of the engine speed regulator, the rotary encoder (rotary encoder) is rotated in accordance with the rotation of the adjustment knob (driver) predetermined adjustment knob When rotated by the angle, the output signal of the encoder is generated according to the rotation angle of the handle and transmitted to the microprocessor, and the microprocessor generates a pulse width modulation having a duty ratio according to the output signal of the received encoder. PWM ') signal is output to the valve ECU, characterized in that configured to control the engine speed. EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail based on an accompanying drawing.

1 is a block diagram of the engine speed control circuit of the present invention. The rotary encoder 10 is shaft-coupled with the adjustment knob of the engine speed controller attached to the inside of the driver's seat of the heavy equipment, and the encoder shaft rotates together with the rotation of the adjustment knob to generate an output signal of the encoder according to the rotation angle of the encoder shaft. do.

According to an embodiment of the present invention, the output signal of the encoder is generated by the five terminals A, B, E, F, G, of which E is the ground terminal and the terminals of A, B, F, G are the Output signal terminal. The output table of the encoder output signal terminal according to the rotational position of the encoder shaft is shown in Table 1 below.

Output table of encoder output signal terminal Rotating stage Rotation angle A B E F G One 0 degree ON ON COMMON ON ON 2 11.25 degrees ON ON COMMON ON OFF 3 22.50 degrees OFF ON COMMON ON OFF 4 33.75 degrees OFF ON COMMON ON ON 5 45 degree OFF ON COMMON OFF ON 6 56.25 degrees OFF ON COMMON OFF OFF 7 67.50 degrees ON ON COMMON OFF OFF 8 78.75 degrees ON ON COMMON OFF ON 9 90 degree ON OFF COMMON OFF ON

As shown in Table 1 above, for example, if the encoder shaft is rotated at a rotational step 5, that is, at an angle of 45 degrees, the output signal of the encoder is A terminal OFF, B terminal ON, F terminal OFF, G terminal ON Will have the output of

The encoder controller 20 is a part that receives the encoder output signal input from the encoder 10 and generates a PWM signal according to the received encoder output signal. To this end, the encoder control unit 20 stores a plurality of input ports for receiving the encoder output signal, an output port for generating a PWM signal, and a memory device such as a nonvolatile ROM or flash memory in which an encoder output signal analysis program is stored. It has a microprocessor and other peripheral circuitry needed to drive the microprocessor.

The encoder controller 20 generates PWM signals having different duty ratios according to the input encoder output signal. The duty ratio of the PWM signal output by the encoder controller 20 in the embodiment of the present invention is shown in Table 2 below.

Duty ratio of PWM signal output by encoder controller Rotating stage Rotation angle      Duty ratio of PWM signal (%) One 0 degree 10 2 11.25 degrees 20 3 22.50 degrees 30 4 33.75 degrees 40 5 45 degree 50 6 56.25 degrees 60 7 67.50 degrees 70 8 78.75 degrees 80 9 90 degree 90

     Therefore, as described above, the encoder controller outputs PWM signals having different duty ratios to the valve ECU 30 by the encoder output signals generated according to the respective rotation stages of the adjustment knob of the rotation controller, and outputs the valve ECU ( 30 generates a voltage output proportional to the duty ratio of the input PWM signal to control the opening and closing of the valve means 35 attached to the engine or the hydraulic system.

     The LED driver 60 of reference numeral 60 drives the LED 65 which is the background lighting of the marking indicating the rotation stage of the handle on the engine speed controller, and the encoder controller 20 emits the LED 65. When the control signal is input to the LED driver 60, the LED driver 60 emits the LED 65 according to the control signal.

     Fig. 2 is a flowchart showing the engine speed control method of the present invention. The operation of the engine speed control circuit of the present invention will be described with reference to the drawings.

     First, when power is applied by the power supply unit 40, the encoder control unit 20 initializes the control circuit (step S 201). Subsequently, when the driver adjusts the engine speed by rotating the engine speed adjusting knob (step S 202), the encoder 10 outputs an encoder signal corresponding to the rotation angle of the adjustment knob (step S 203).

      On the other hand, the engine speed controller according to the embodiment of the present invention can set the basic position at which the knob is not rotated at all. In this case, the duty ratio of the PWM signal output from the encoder controller 20 is set as 0%.

     Then, the encoder control unit 20 receives the output signal of the encoder 10 and determines the type of the input encoder signal (step S204).

     At this time, if the input encoder signal is a signal corresponding to the rotation step 1 of Table 2 (step S 205), the encoder control unit 20 outputs a PWM signal having a duty ratio of 10% to the valve ECU 30 (step S 205-1),

     If the input encoder signal corresponds to the rotation step 2 of Table 2 (step S 206), the encoder controller 20 outputs a PWM signal having a duty ratio of 20% to the valve ECU 30 (step S 206). -One),

     If the input encoder signal is a signal corresponding to the rotation step 3 of Table 2 (step S 207), the encoder controller 20 outputs a PWM signal having a duty ratio of 30% to the valve ECU 30 (step S 207). -One),

     If the input encoder signal corresponds to the rotation step 4 of Table 2 (step S 208), the encoder controller 20 outputs a PWM signal having a duty ratio of 40% to the valve ECU 30 (step S 208). -One),

      If the input encoder signal corresponds to the rotation step 5 of Table 2 (step S 209), the encoder controller 20 outputs a PWM signal having a duty ratio of 50% to the valve ECU 30 (step S 209). -One),

     If the input encoder signal corresponds to the rotation step 6 of Table 2 (step S 210), the encoder controller 20 outputs a PWM signal having a duty ratio of 60% to the valve ECU 30 (step S 210). -One),

     If the input encoder signal corresponds to the rotation step 7 of Table 2 (step S 211), the encoder controller 20 outputs a PWM signal having a duty ratio of 70% to the valve ECU 30 (step S 211). -One),

     If the input encoder signal corresponds to the rotation step 8 of Table 2 (step S 212), the encoder control unit 20 outputs a PWM signal having a duty ratio of 80% to the valve ECU 30 (step S 212). -One),

     If the input encoder signal is a signal corresponding to the rotation step 9 of Table 2 (step S 213), the encoder controller 20 outputs a PWM signal having a duty ratio of 90% to the valve ECU 30 (step S 213). -One).

      At this time, if the engine speed controller is a basic position where the knob is not rotated at all (step S 214), the encoder controller 20 outputs a PWM signal to the valve ECU 30 with a duty ratio of 0% (step S 214). 214-1).

    Next, the valve ECU 30 receiving the PWM signal from the encoder control unit 20 as described above generates a voltage output proportional to the duty ratio of the input PWM signal to the valve means 35 attached to the engine or hydraulic system. The engine speed is adjusted by controlling the opening and closing of the engine (step S 215).

     The engine speed control circuit and the method according to the present invention configured as described above are as follows.

     First, since the encoder output signal according to the rotation angle of the adjustment knob is digitally input to the microprocessor, it is possible to perform more precise and accurate control compared to the analog control circuit using a conventional variable resistor. have.

     Second, it eliminates the chattering phenomenon that may occur when the variable resistance value changes in the related art and thus does not require the addition of a compensation circuit, thereby simplifying the circuit configuration and improving the miniaturization and low power of the product.

     Third, there is no need to employ a high-cost variable resistor to increase the precision, thereby reducing the manufacturing cost.

Claims (3)

In the engine speed regulator attached inside the driver's seat of heavy equipment, A rotary encoder coupled to the adjustment knob of the engine speed controller, the encoder shaft being rotated together with the rotation of the adjustment knob to generate an encoder output signal according to the rotation angle of the encoder shaft; And An encoder controller (20) which receives the encoder output signal input from the rotary encoder (10) and outputs a pulse width modulation (PWM) signal having a different duty ratio according to the encoder output signal; And The valve means 35 attached to the engine or the hydraulic system by generating a voltage output proportional to the duty ratio of the input pulse width modulation (PWM) signal received from the pulse width modulation (PWM) signal output from the encoder controller 20 Valve ECU 30 for controlling the opening and closing of Engine speed control circuit using a rotary encoder, characterized in that comprising a. The method of claim 1,       It further comprises an LED driver 60 for driving the LED 65, which is the backlight of the marking indicating the stage of rotation of the handle on the engine speed controller,      When the encoder control unit 20 inputs a control signal for emitting the LED 65 to the LED driver 60, the rotary encoder characterized in that the LED driver 60 emits the LED 65 according to the control signal thereof. Engine speed control circuit using.      In the engine speed regulator attached inside the driver's seat of heavy equipment,     When the driver rotates the adjustment knob at a predetermined angle by attaching a rotary encoder in which the shaft is rotated in accordance with the rotation of the adjustment knob by coupling the shaft with the adjustment knob of the engine speed controller, an output signal of the encoder according to the rotation angle of the knob is generated. The microprocessor is configured to output a pulse width modulation (PWM) signal having a duty ratio according to the output signal of the encoder to the valve ECU to control the rotational speed of the engine. Engine speed control method using.

Images