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NFPE control system for Plus 1

The NFPE control based on PLUS 1 provides control related to the engine speed. For off-highway vehicles, it provides a vehicle walking drive system with similar driving characteristics to road vehicles, and the vehicle has an automatic stepless speed regulation (CVT) function. For the single-pump single-motor closed drive system, the PLUS 1 controller can flexibly set the control logic, which improves the handling performance of the vehicle. The controller converts the direct command of the operator or the engine speed signal into the control signal of the variable piston pump according to the preset control curve related to the engine speed. At the same time, the integrated controller can be used to control a two-position or electric proportional variable motor, as well as other input/output signals related to the vehicle travel drive system. The corresponding control parameters can be flexibly adjusted, and the machine performance can be customized according to the customer's personalized requirements.
  • Commodity name: NFPE control system for Plus 1

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  • Product Description
  • NFPETechnical Manual

    1.    System Introduction

    Based on PLUS 1The NFPE control provides control related to the engine speed. For off-highway vehicles, it provides a vehicle walking drive system similar to the driving characteristics of road vehicles, and the vehicle has an automatic stepless speed regulation (CVT) function. For the single-pump single-motor closed drive system, the PLUS 1 controller can flexibly set the control logic, which improves the handling performance of the vehicle. The controller converts the direct command of the operator or the engine speed signal into the control signal of the variable piston pump according to the preset control curve related to the engine speed. At the same time, the integrated controller can be used to control a two-position or electric proportional variable motor, as well as other input/output signals related to the vehicle travel drive system. The corresponding control parameters can be flexibly adjusted, and the machine performance can be customized according to the customer's personalized requirements.

    Based on PLUS 1The NFPE control is based on the control characteristics of the electric proportional non-feedback NFPE pump. The flexible system configuration allows the electronic control foot pedal, control handle, motor or other company's products to be combined. The system composition is shown in Figure 1.

    2.1. Drive function

        2An optional driving mode can be switched by a mode switch;

        Independently set forward and backward drive curves (2× 2, 4 curves in total);

        Can realize inch into function, without additional control valve;

        When the brake is in working condition, the engine shall be protected against overspeed;

    2.2.Integrated motor control function

        With variable PCORFunction of proportional motor or two-position variable motor;

        With pressure brake failure function, depending on FNRThe position of the handle or the direction of the actual driving of the vehicle assist function;

        2An optional drive mode, which can be switched by the mode switch, and the curve can be set independently;

    2.3.auxiliary digital output

        Intelligent brake light control;

        Automatic parking brake function;

        When reversing or FNRReversing alarm controlled by handle position;

        Engine Start Protection (FNRnot in the median);

        System status light fault monitoring;

    2.    Advantages

        Can achieve low fuel consumption drive, fuel saving;

        CAN EASY WITH PLUS 1The other products of the family are combined;

        CAN J1939realize engine information sharing and control;

        All follow protocol CAN J1939compatible with products (displays, etc.);

        Comfortable and convenient driving (CVTfunction);

    3.    Input

    4.1 FNRSwitch

    Used to determine the driving direction and control the forward-stop-reverse of the vehicle, usually 2Digital input, high level active.

    4.2Pump/Engine Speed

    Engine speed input can be from an external PPU, can also come from the CAN bus, select only in the Service Tool interface configuration.

    4.3 Mode switch (optional)

    The mode switch can be used to select one of two different system drive modes, the low level is the transport mode, and the high level is the working mode.

    4.4Inch foot pedal or sensor (optional)

    Inch foot pedal/The sensor uses a 0 to 5VDC analog input to reduce the control current of the pump and motor control valves. At this time, the operator can keep the vehicle at a very low speed (similar to braking) while increasing the engine speed to meet the flow needs of the auxiliary working mechanism.

    4.4Handbrake switch quantity (optional)

    The handbrake configuration is more in line with driving habits. The high level is the brake state, and the low level is the handbrake release state.

    4.5 PedalBrake switch (optional)

    When the brake is stepped on, trigger a switch input controller, the high level is effective, and the control pump current decreases to 0 through a brake slopeAvoid engine stalling and other hazards.

    4.6Two-position variable motor control switch (optional)

    Manually control the motor displacement, the motor becomes a small displacement at high level, and a large displacement at low level.

    4.    Output

    5.1Pump Displacement Control

    The displacement of the drive pump is related to the engine speed. The higher the speed, the larger the displacement of the drive pump.2As shown in6The curve determined by the point controls the displacement of the pump. For the working conditions of forward work, backward work, forward transportation and backward transportation, the parameter points are output according to their respective curves.XThe shaft is the engine speed, unitRPM,Ydirection as a percentage of pump displacement, setting10000Hundred percentPump displacement; when there is no working mode configuration, only the parameters of the working condition curve of the transportation mode forward and the transportation mode backward are set.

    Related to the engine speed control, the drive curve set in the program is set according to the available torque of the engine and the energy demand of the auxiliary working mechanism. The pump proportional control current is determined by the drive curve after the engine speed and system parameters are set. Give.

    5.2Dual/proportional variable motor control (optional)

    For the two-position variable motor, the motor displacement is cut by the high and low speed switch; for the continuous variable proportional motor, according to the following settable 6The point curve sets the control motor displacement current as shown in Fig. 3, and the motor displacement change curve as shown in Fig. 4.

     

    Double/The proportional variable motor control provides an output signal that controls the variable solenoid on the motor, so that the displacement of the motor can be controlled.

    5.3Brake Pressure Failure (BPD)

    Brake pressure failure By outputting a digital signal to switch the brake pressure failure solenoid valve on the motor to prevent the vehicle from braking violently at excessive speed. This output signal is directly related to the direction of travel and the braking time of the vehicle. During the deceleration process, the brake pressure failure valve cancels the original high-pressure independent variable function on the motor. At this time, even if the system pressure reaches PCOR in the brake conditionWhen setting the value, the motor can maintain a small displacement (small brake torque), and does not change to a large displacement.

    brake pressure failure and the type of motor (51Motor, H1 motor) is related to the high pressure port (port A and port B) of the vehicle forward motor, and the output logic is as shown in Appendix 2.

    5.4Parking control

    NFPEThe control triggers the parking brake in the following conditions:

    FNRThe switch is in the neutral position or back to the neutral position for more than the time set by the customer;

    Target value is 0exceed the scheduled time;

    5.5Brake light control

    When the foot brake switch value is triggered or the parking brake is applied, the brake light is on;

    5.6Buzzer control

    When reversing, trigger the buzzer to realize the reversing alarm, the control logic can be from FNRThe status of the three-position control handle or the actual walking direction.

    5.7Start protection control

    FNR onlyWhen the switch is in the neutral position, the controller outputs the engine start enable signal, otherwise it can only be started when the FNR switch returns to the neutral position.

    5.8Fault lamp flashing intelligent alarm

    Fault status output digitally drives one LEDLight, based on the number of long and short flashes to identify the warning of the fault status/error code, you can also use the Service Tool interface to identify the fault.

    1.MoreFunction

    6.1Automatic parking brake

    When the system is just started, when the forward and backward switch is in the neutral position, even if the handbrake is released, the parking brake valve is closed, and the parking brake; when driving, FNRWhen the switch is switched back to neutral, the parking brake valve will be closed for a period of time, which can be customized.

    6.2Brake priority function (optional function)

    When the brake is stepped on, a switch is triggered to input the controller, and the control pump current is reduced to 0 through a brake slopeAvoid engine stalling and other hazards.

    6.3Switch between working mode and transport mode by mode switch (optional function):

    When there is a mode configuration, for some walking machinery, the characteristics of working conditions and transportation conditions are different. Switch the working mode and transportation mode through the switch value. When the working mode switch is opened (low level), it is in the transportation mode. When the working mode switch is closed (high level), it is in the working mode.

    When there is no mode configuration, the vehicle is always in transport mode.

    6.4 Inch Pedal inch function (optional function)

    InchPedal/The sensor uses an analog input to reduce the control current of the pump and motor control valves. At this time, the operator can keep the vehicle at a very low speed (similar to braking) while increasing the engine speed to meet the flow requirements of the auxiliary working mechanism, so as to meet certain working conditions, and the engine speed needs to be maintained or increased to meet the auxiliary The vehicle speed is reduced while the flow of the working mechanism.

    InchPedal 0.5After the ~ 4.5V analog signal is input to the controller, it is linearly converted into 0~10000 through the one-two automatic calibration module. 0 means that the Inch pedal is not depressed, and 10000 means that the Inch pedal is depressed to the end.

    InchPedal analog signal input start value and overspeed value through Service ToolTool pulse triggers automatic calibration.

    6.5 InchPedal action slope segment setting

    InchThe effect of the first half of the pedal and the effect of the second half of the pedal pass a set of parameters (X, Y) set, the effect is as shown in Figure 5, the first half of the effect is weak, the second half of the effect is strong, can also set the first half of the effect is strong, the second half of the effect is weak.

    6.6 engine overspeed protection

    with InchWith the pedal configuration system, the Inch inch function reduces the displacement of the pump, so as to meet certain working conditions, it is necessary to maintain or increase the engine speed to meet the flow of the auxiliary working mechanism while reducing the vehicle speed. The characteristic curve of the inch-in function and the interactive control function with the drive motor can be programmed. The engine anti-overspeed protection function detects the engine speed under the inch-in working condition to prevent the engine from overspeeding when the engine is braking or the vehicle is going downhill.

    The engine overspeed protection start value and allowable overspeed value can be set.

    The engine overspeed protection start speed is the high engine speed in the pump working curve. When the engine speed is the engine overspeed protection start speed, the overspeed protection scale factor is 0(0%); When the engine speed reaches the maximum value allowed by the overspeed protection, the overspeed protection scale factor is 10000, and the Inch effect disappears completely at this time.

    6.7 Independently set pump/motor drive control curve and control ramp

    When the vehicle's forward, backward, stop, and braking states change with each other, the slope time, soft slope start, and soft slope start are independently set.

     

     

     

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