Truck air conditioner condenser rotating speed control system

Abstract

The invention discloses a rotating speed control system for a truck air conditioner condenser. The rotating speed control system comprises a condenser control module, an air conditioner relay, a temperature controller, a pressure switch and an electromagnetic clutch. The coil end of the air conditioner relay, the coil end of the electromagnetic clutch, the pressure switch and the output end of the temperature controller are sequentially connected in series, the input end of the electromagnetic clutch is connected with the output end of the ignition switch, and the output end of the electromagnetic clutch is electrically connected with the condenser motor. The coil end of the air-conditioning relay is connected with the output end of the ignition switch; the input end of the air-conditioning relay is connected with the positive electrode of the battery; the condenser control module is electrically connected with a condenser motor and controls the electric connection conduction duration of the output end of the ignition switch to the condenser motor according to the refrigerant pressure of the air conditioning system so as to generate a PWM control signal corresponding to the rotating speed of a condenser fan, and then the rotating speed of a condenser is controlled. The energy consumption of the vehicle can be reduced, and the service life of the condenser fan is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile air conditioner control, and more particularly to a truck air conditioner condenser rotating speed control system. BACKGROUND

[0002] When the automobile air conditioner system is refrigerating, the condenser fan and the compressor work, the refrigerant flows through the refrigerant circulation of the evaporative core in the air bellow, and the low-temperature liquid refrigerant formed by the compressor, the condenser, the throttle pipe and other effects absorbs the heat of the surrounding air to achieve refrigeration. However, the air conditioner condenser fan works for a long time, causing the coil to age, the current to increase, the working efficiency to decrease, and energy waste and oil consumption to increase. Therefore, how to intelligently control the rotating speed of the air conditioner condenser fan to reduce energy consumption is of great significance. SUMMARY

[0003] The present application provides a truck air conditioner condenser rotating speed control system, which solves the problem of energy waste caused by long-time work of the air conditioner condenser fan during operation of the existing automobile air conditioner, reduces the energy consumption of the vehicle, and prolongs the service life of the condenser fan.

[0004] To achieve the above object, the present application provides the following technical scheme:

[0005] A truck air conditioner condenser rotating speed control system, comprising: a condenser control module, an air conditioner relay, a temperature controller, a pressure switch and an electromagnetic clutch.

[0006] The coil end of the air conditioner relay, the coil end of the electromagnetic clutch, the output end of the pressure switch and the output end of the temperature controller are connected in sequence, the input end of the electromagnetic clutch is connected with the output end of the ignition switch, and the output end of the electromagnetic clutch is connected with the condenser motor.

[0007] The coil end of the air conditioner relay is connected with the output end of the ignition switch, and the input end of the air conditioner relay is connected with the positive electrode of the battery.

[0008] The condenser control module is connected with the condenser motor, and controls the on duration of the output end of the ignition switch to the condenser motor to generate a PWM control signal corresponding to the rotating speed of the condenser fan, so as to control the rotating speed of the condenser.

[0009] Preferably, it further comprises a compressor.

[0010] The output end of the electromagnetic clutch is connected with the control end of the compressor, and when the electromagnetic clutch is closed, the output end of the ignition switch supplies power to the control end of the compressor and the condenser motor to trigger the operation enable signal of the compressor and the condenser.

[0011] Preferably, the condenser control module includes: a switching circuit and a refrigerant pressure control circuit;

[0012] The output terminal of the refrigerant pressure control circuit is connected to the control terminal of the switching circuit, and the output terminal of the switching circuit is connected to the control terminal of the condenser motor.

[0013] The refrigerant pressure control circuit adjusts the duty cycle of the output PWM control signal according to the refrigerant pressure, and controls the switching circuit to turn on or off through the PWM control signal, thereby controlling the condenser speed.

[0014] Preferably, the switching circuit includes: an optocoupler and a transistor;

[0015] The optocoupler's optocoupler terminal is connected to the output terminal of the refrigerant pressure control circuit, and the optocoupler's conducting terminal is connected in series between the output terminal of the ignition switch and the base of the transistor to control the input level of the transistor's base.

[0016] When the output of the refrigerant pressure control circuit is high, the optocoupler is turned on, which enables the transistor to connect the electrical connection between the control terminal of the condenser motor and the vehicle ground.

[0017] When the refrigerant pressure control circuit outputs a low level, the optocoupler disconnects the electrical connection between the base of the transistor and the output of the ignition switch, and disconnects the electrical connection between the control terminal of the condenser motor and the vehicle ground.

[0018] Preferably, the refrigerant pressure control circuit includes: a first voltage comparator, a first capacitor, a second voltage comparator, an adjusting resistor, and a voltage dividing resistor;

[0019] The output terminal of the first voltage comparator is connected to the inverting input terminal of the second voltage comparator. The inverting input terminal of the first voltage comparator is connected to one end of the first capacitor. The other end of the first capacitor is connected to the vehicle ground. The non-inverting input terminal of the first voltage comparator is electrically connected to the output terminal of the ignition switch.

[0020] The regulating resistor and the voltage dividing resistor are connected in series to form a voltage dividing circuit, and are respectively connected to the non-inverting input terminal and the inverting input terminal of the first voltage comparator;

[0021] The non-inverting input of the second voltage comparator is connected to the output of the voltage divider circuit. The resistance of the adjusting resistor changes with the refrigerant pressure, thereby causing the output voltage of the voltage divider circuit to change with the refrigerant pressure.

[0022] Preferably, the output terminal of the voltage divider circuit is located between the regulating resistor and the voltage divider resistor.

[0023] Preferably, it also includes: an AC switch;

[0024] The AC switch is signal-connected to the thermostat, and the thermostat controls the electrical connection between the coil end of the electromagnetic clutch and the ignition switch to be turned on or off according to the output signal of the AC switch.

[0025] Preferably, it also includes: a blower;

[0026] The power supply terminal of the blower is connected to the output terminal of the air conditioning relay. The thermostat controls the air conditioning relay to turn on or off according to the output signal of the AC switch, thereby controlling the operation or stop of the blower.

[0027] Preferably, it also includes: a blower switch and a speed control resistor;

[0028] The blower switch is connected to the speed regulating resistor signal, and the power supply terminal of the blower is connected to the output terminal of the blower switch;

[0029] The blower switch adjusts the blower speed via the speed regulating resistor.

[0030] Preferably, it also includes: an air conditioning controller;

[0031] The air conditioning controller is connected to the compressor, the thermostat, the AC switch, and the blower switch for signal interaction.

[0032] This invention provides a truck air conditioner condenser speed control system. It includes a condenser control module that controls the duration of electrical connection between the ignition switch output and the condenser motor based on the refrigerant pressure of the air conditioning system. This generates a PWM control signal corresponding to the condenser fan speed, thereby controlling the condenser speed. This solves the problem of energy waste caused by prolonged operation of the air conditioner condenser fan during existing automotive air conditioning systems, reducing vehicle energy consumption and extending the service life of the condenser fan. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below.

[0034] Figure 1 This is a schematic diagram of a truck air conditioner condenser speed control circuit provided by the present invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and implementation methods.

[0036] To address the problem of energy waste caused by prolonged operation of the air conditioning condenser fan during current automotive air conditioning operation, this invention provides a truck air conditioning condenser speed control system. This system solves the problem of energy waste caused by prolonged operation of the air conditioning condenser fan during current automotive air conditioning operation, reduces vehicle energy consumption, and extends the service life of the condenser fan.

[0037] like Figure 1 As shown, a truck air conditioning condenser speed control system includes: a condenser control module, an air conditioning relay K1, a thermostat, a pressure switch, and an electromagnetic clutch K2. The coil terminals of the air conditioning relay K1, the electromagnetic clutch K2, the pressure switch, and the thermostat are connected in series. The input terminal of the electromagnetic clutch is connected to the output terminal of the ignition switch, and the output terminal of the electromagnetic clutch is electrically connected to the condenser motor M1. The coil terminal of the air conditioning relay K1 is connected to the output terminal IG2 of the ignition switch, and the input terminal of the air conditioning relay K1 is connected to the positive terminal B+ of a battery. The condenser control module is electrically connected to the condenser motor M1 and controls the duration of the ignition switch's electrical connection to the condenser motor based on the refrigerant pressure of the air conditioning system, thereby generating a PWM control signal corresponding to the condenser fan speed and controlling the condenser speed.

[0038] Specifically, the condenser fan is controlled by a motor. When the refrigerant pressure is high, the condenser control module controls the ignition switch to maintain a longer electrical connection with the condenser motor; conversely, when the refrigerant pressure is low, the connection time is shorter. This changes the duty cycle of the PWM control signal corresponding to the condenser fan speed, thereby controlling the condenser speed. This system solves the problem of energy waste caused by prolonged operation of the air conditioning condenser fan in existing automotive air conditioning systems, reducing vehicle energy consumption and extending the condenser fan's lifespan.

[0039] The system also includes a compressor; the output end of the electromagnetic clutch is connected to the control end of the compressor, and when the electromagnetic clutch is closed, the output end of the ignition switch supplies power to the control ends of the compressor and the condenser motor to trigger the operation enable signal of the compressor and the condenser.

[0040] Furthermore, the condenser control module includes a switching circuit and a refrigerant pressure control circuit. The output terminal of the refrigerant pressure control circuit is connected to the control terminal of the switching circuit, and the output terminal of the switching circuit is connected to the control terminal of the condenser motor. The refrigerant pressure control circuit adjusts the duty cycle of the output PWM control signal according to the refrigerant pressure, and controls the switching circuit to turn on or off through the PWM control signal, thereby controlling the condenser speed.

[0041] Furthermore, the switching circuit includes an optocoupler and a transistor Q2. The optocoupler's optocoupler terminal is connected to the output terminal of the refrigerant pressure control circuit, and the conducting terminal of the optocoupler is connected in series between the output terminal of the ignition switch and the base of the transistor Q2 to control the input level of the base of the transistor Q2. When the output terminal of the refrigerant pressure control circuit outputs a high level, the optocoupler conducts, enabling the transistor to connect the electrical connection between the condenser motor control terminal and the vehicle ground. When the output terminal of the refrigerant pressure control circuit outputs a low level, the optocoupler disconnects the electrical connection between the base of the transistor and the output terminal of the ignition switch, thus disconnecting the electrical connection between the condenser motor control terminal and the vehicle ground.

[0042] Furthermore, the refrigerant pressure control circuit includes: a first voltage comparator U1, a first capacitor C2, a second voltage comparator U2, an adjusting resistor RT, and a voltage divider resistor R10. The output terminal of the first voltage comparator is connected to the inverting input terminal of the second voltage comparator. The inverting input terminal of the first voltage comparator U1 is connected to one end of the first capacitor C2, and the other end of the first capacitor C2 is connected to the vehicle ground. The non-inverting input terminal of the first voltage comparator U1 is electrically connected to the output terminal of the ignition switch. The adjusting resistor RT and the voltage divider resistor are connected in series to form a voltage divider circuit, and are respectively connected to the non-inverting input terminal and the inverting input terminal of the first voltage comparator U1. The non-inverting input terminal of the second voltage comparator U2 is connected to the output terminal of the voltage divider circuit. The resistance value of the adjusting resistor RT changes with the refrigerant pressure, thereby causing the output voltage of the voltage divider circuit to change with the refrigerant pressure.

[0043] Furthermore, the output terminal of the voltage divider circuit is located between the regulating resistor and the voltage divider resistor.

[0044] Specifically, the voltage at the positive input terminal of the first voltage comparator U1 is higher than the voltage at the negative input terminal, so voltage comparator U1 outputs a high level, and the first capacitor C2 is charged. As time goes on, the voltage at the negative input terminal of the first voltage comparator U1 continuously increases. When the voltage at the negative input terminal of the second voltage comparator U2 is higher than the voltage at the positive input terminal, the second voltage comparator U2 outputs a low level. At this time, the light-emitting diode D1 of the optocoupler conducts, and the transistor Q1 of the optocoupler conducts, causing the input terminal of transistor Q2 to input a high level. At this time, transistor Q2 conducts, and the condenser fan operates at full speed. As the voltage at the negative input terminal of the first voltage comparator U1 increases, the voltage at the positive input terminal of the first voltage comparator U1 becomes lower than the voltage at the negative input terminal, and the first voltage comparator U1 outputs a low level. When capacitor C2 is discharged, the voltage at the inverting input of the first voltage comparator U1 decreases over time. When the voltage at the inverting input of the second voltage comparator U2 is lower than the voltage at the non-inverting input, the second voltage comparator U2 outputs a high level. At this time, the LED D1 of the optocoupler is cut off, and the transistor Q1 of the optocoupler is cut off, causing the input of transistor Q2 to be low. At this time, transistor Q2 is cut off, and the condenser fan stops working. The adjusting resistor RT can be a varistor. When the air conditioning system pressure is high, the low level output of voltage comparator U2 lasts for a longer time, and the condenser fan speed is higher. When the air conditioning system pressure is low, the high level output of voltage comparator U2 lasts for a longer time, and the condenser fan speed is lower, thus achieving the purpose of condenser fan speed control.

[0045] The system also includes: an AC switch; the AC switch is signal-connected to the thermostat, and the thermostat controls the conduction or disconnection of the electrical connection between the coil end of the electromagnetic clutch and the ignition switch according to the output signal of the AC switch.

[0046] The system also includes: a blower M2; the power supply terminal of the blower is connected to the output terminal of the air conditioning relay, and the thermostat controls the air conditioning relay to turn on or off according to the output signal of the AC switch, thereby controlling the operation or stop of the blower.

[0047] The system also includes: a blower switch and a speed regulating resistor; the blower switch is signal-connected to the speed regulating resistor, and the power supply terminal of the blower is connected to the output terminal of the blower switch; the blower switch regulates the blower speed through the speed regulating resistor.

[0048] The system also includes an air conditioning controller; the air conditioning controller is connected to the compressor, the thermostat, the AC switch and the blower switch respectively for signal interaction.

[0049] As can be seen, the present invention provides a truck air conditioner condenser speed control system, which sets up a condenser control module and controls the duration of electrical connection between the output terminal of the ignition switch and the condenser motor according to the refrigerant pressure of the air conditioning system, so as to generate a PWM control signal corresponding to the condenser fan speed, thereby controlling the condenser speed. This solves the problem that the air conditioner condenser fan is prone to energy waste due to long-term operation during the operation of existing automobile air conditioners, and can reduce vehicle energy consumption and improve the service life of the condenser fan.

[0050] The structure, features, and effects of the present invention have been described in detail above with reference to the embodiments shown in the figures. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, shall be within the protection scope of the present invention as long as they do not exceed the spirit covered by the specification and figures.

Claims

1. A truck air conditioner condenser speed control system, characterized in that, include: Condenser control module, air conditioning relay, thermostat, pressure switch and electromagnetic clutch; The coil end of the air conditioning relay, the coil end of the electromagnetic clutch, the pressure switch and the output end of the thermostat are connected in series in sequence. The input end of the electromagnetic clutch is connected to the output end of the ignition switch, and the output end of the electromagnetic clutch is electrically connected to the condenser motor. The coil terminal of the air conditioning relay is connected to the output terminal of the ignition switch, and the input terminal of the air conditioning relay is connected to the positive terminal of the battery. The condenser control module is electrically connected to the condenser motor, and controls the duration of the electrical connection between the output terminal of the ignition switch and the condenser motor according to the refrigerant pressure of the air conditioning system, so as to generate a PWM control signal corresponding to the condenser fan speed, thereby controlling the condenser speed.

2. The truck air conditioner condenser speed control system according to claim 1, characterized in that, Also includes: compressor; The output terminal of the electromagnetic clutch is connected to the control terminal of the compressor. When the electromagnetic clutch is closed, the output terminal of the ignition switch supplies power to the control terminals of the compressor and the condenser motor to trigger the operation enable signal of the compressor and the condenser.

3. The truck air conditioner condenser speed control system according to claim 2, characterized in that, The condenser control module includes: a switching circuit and a refrigerant pressure control circuit; The output terminal of the refrigerant pressure control circuit is connected to the control terminal of the switching circuit, and the output terminal of the switching circuit is connected to the control terminal of the condenser motor. The refrigerant pressure control circuit adjusts the duty cycle of the output PWM control signal according to the refrigerant pressure, and controls the switching circuit to turn on or off through the PWM control signal, thereby controlling the condenser speed.

4. The truck air conditioner condenser speed control system according to claim 3, characterized in that, The switching circuit includes: an optocoupler and a transistor; The optocoupler's optocoupler terminal is connected to the output terminal of the refrigerant pressure control circuit, and the optocoupler's conducting terminal is connected in series between the output terminal of the ignition switch and the base of the transistor to control the input level of the transistor's base. When the output of the refrigerant pressure control circuit is high, the optocoupler is turned on, which enables the transistor to connect the electrical connection between the control terminal of the condenser motor and the vehicle ground. When the refrigerant pressure control circuit outputs a low level, the optocoupler disconnects the electrical connection between the base of the transistor and the output of the ignition switch, and disconnects the electrical connection between the control terminal of the condenser motor and the vehicle ground.

5. The truck air conditioner condenser speed control system according to claim 4, characterized in that, The refrigerant pressure control circuit includes: a first voltage comparator, a first capacitor, a second voltage comparator, an adjusting resistor, and a voltage dividing resistor; The output terminal of the first voltage comparator is connected to the inverting input terminal of the second voltage comparator. The inverting input terminal of the first voltage comparator is connected to one end of the first capacitor. The other end of the first capacitor is connected to the vehicle ground. The non-inverting input terminal of the first voltage comparator is electrically connected to the output terminal of the ignition switch. The regulating resistor and the voltage dividing resistor are connected in series to form a voltage dividing circuit, and are respectively connected to the non-inverting input terminal and the inverting input terminal of the first voltage comparator; The non-inverting input of the second voltage comparator is connected to the output of the voltage divider circuit. The resistance of the adjusting resistor changes with the refrigerant pressure, thereby causing the output voltage of the voltage divider circuit to change with the refrigerant pressure.

6. The truck air conditioner condenser speed control system according to claim 5, characterized in that, The output terminal of the voltage divider circuit is located between the regulating resistor and the voltage divider resistor.

7. The truck air conditioner condenser speed control system according to claim 6, characterized in that, Also includes: AC switch; The AC switch is signal-connected to the thermostat, and the thermostat controls the electrical connection between the coil end of the electromagnetic clutch and the ignition switch to be turned on or off according to the output signal of the AC switch.

8. The truck air conditioner condenser speed control system according to claim 7, characterized in that, Also includes: Blower; The power supply terminal of the blower is connected to the output terminal of the air conditioning relay. The thermostat controls the air conditioning relay to turn on or off according to the output signal of the AC switch, thereby controlling the operation or stop of the blower.

9. The truck air conditioner condenser speed control system according to claim 8, characterized in that, Also includes: Blower switch and speed control resistor; The blower switch is connected to the speed regulating resistor signal, and the power supply terminal of the blower is connected to the output terminal of the blower switch; The blower switch adjusts the blower speed via the speed regulating resistor.

10. The truck air conditioner condenser speed control system according to claim 9, characterized in that, Also includes: Air conditioner controller; The air conditioning controller is connected to the compressor, the thermostat, the AC switch, and the blower switch for signal interaction.

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