A speed control circuit, device and vehicle for an air conditioner condenser fan

Abstract

The application discloses a rotating speed control circuit, device and vehicle of an air conditioner condenser fan, and the rotating speed control circuit comprises a rotating speed sensor, an adjusting direction control circuit and a rotating speed control circuit; the rotating speed sensor is fixed on the air conditioner condenser fan, the output end of the rotating speed sensor is connected with the input end of the adjusting direction control circuit, the output end of the adjusting direction control circuit is connected with the input end of the rotating speed control circuit, and the output end of the rotating speed control circuit is connected with the input end of the motor of the air conditioner condenser fan. The application adjusts the rotating speed of the air conditioner condenser fan through the real-time rotating speed signal of the fan, reduces the energy consumption under the condition of meeting the system demand, slows down the aging speed of the coil on the fan, improves the working efficiency as a whole, and reduces the oil consumption.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more specifically, to an air conditioning condenser fan speed control circuit, device, and vehicle. Background Technology

[0002] In existing automotive air conditioning systems, when the car's power switch, windshield switch, and air conditioning AC switch are turned on, the condenser fan and compressor start working. The refrigerant (R134a) flows through the refrigerant circulation system of the evaporator core in the air box. The low-temperature liquid refrigerant formed by the compressor, condenser, expansion tube, etc., absorbs heat from the surrounding air, thereby achieving cooling.

[0003] In existing technology, during the air conditioning cooling process, the fan inside the condenser operates at a fixed speed for a long time, which wastes energy and causes the fan coil to age, increase current, reduce working efficiency, and increase fuel consumption. Summary of the Invention

[0004] This application provides a speed control circuit, device, and vehicle for an air conditioner condenser fan. By adjusting the speed of the air conditioner condenser fan through the real-time speed signal of the fan, the energy consumption is reduced while meeting system requirements, and the aging rate of the coil on the fan is slowed down, thereby improving overall working efficiency and reducing fuel consumption.

[0005] This application provides a speed control circuit for an air conditioner condenser fan, including a speed sensor, an adjustment direction control circuit, and a speed control circuit;

[0006] The speed sensor is fixed on the air conditioner condenser fan. The output terminal of the speed sensor is connected to the input terminal of the adjustment direction control circuit. The output terminal of the adjustment direction control circuit is connected to the input terminal of the speed control circuit. The output terminal of the speed control circuit is connected to the input terminal of the air conditioner condenser fan motor.

[0007] The direction control circuit is used to receive the speed signal of the air conditioner condenser fan input by the speed sensor, and output a pulse signal to the speed control circuit according to the speed signal;

[0008] The speed control circuit generates a speed control signal based on the pulse signal and outputs it to the motor.

[0009] Preferably, the speed control circuit includes a first transistor and a second transistor;

[0010] The base of the first transistor is connected to the output terminal of the direction adjustment control circuit, the collector of the first transistor is connected to the power supply through the first resistor, and the emitter of the first transistor is grounded.

[0011] The base of the second transistor is connected to the collector of the first transistor, the collector of the second transistor is connected to the power supply, and the emitter of the second transistor is connected to the input terminal of the motor.

[0012] Preferably, the direction control circuit includes an input signal processing circuit and a signal generator;

[0013] The input terminal of the input signal processing circuit is connected to the output terminal of the speed sensor, the output terminal of the input signal processing circuit is connected to the input terminal of the signal generator, and the output terminal of the signal generator is connected to the input terminal of the speed control circuit.

[0014] The input signal processing circuit is used to receive the speed signal of the air conditioner condenser fan from the speed sensor, and output a voltage signal to the signal generator based on the speed signal;

[0015] The signal generator produces pulse signals based on the voltage signal and outputs them to the speed control circuit.

[0016] Preferably, the input signal processing circuit includes a third transistor and a first capacitor;

[0017] The base of the third transistor is connected to the power supply through the speed sensor, the collector of the third transistor is connected to the power supply through the second resistor, and the emitter of the third transistor is grounded.

[0018] The first terminal of the first capacitor is connected to the collector of the third transistor, and the second terminal of the first capacitor is connected to the input terminal of the signal generator.

[0019] Preferably, the direction control circuit further includes a discharge circuit, which includes a third resistor and a second capacitor. The first end of the third resistor is connected to the power supply, the second end of the third resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

[0020] Preferably, the signal generator is a single-time base circuit. The second pin of the single-time base circuit is connected to the output terminal of the input signal processing circuit, the third pin of the single-time base circuit is connected to the input terminal of the speed control circuit, and the sixth and seventh pins of the single-time base circuit are both connected to the first terminal of the second capacitor.

[0021] Preferably, the speed control circuit further includes a voltage divider circuit, which includes an adjustable resistor and a fourth resistor. The first end of the adjustable resistor is connected to the power supply, the second end of the adjustable resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded.

[0022] Preferably, a diode and a fifth resistor are connected in parallel between the second terminal of the first capacitor and the power supply.

[0023] This application also provides a speed control device for an air conditioner condenser fan, which includes the above-mentioned speed control circuit for the air conditioner condenser fan.

[0024] This application also provides a vehicle that includes the above-described air conditioning condenser fan speed control device.

[0025] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0027] Figure 1 A schematic diagram of the speed control circuit for the air conditioner condenser fan provided in this application;

[0028] Figure 2 A schematic diagram of the structure of the air conditioning system and the speed control circuit of the air conditioning condenser fan of the vehicle provided in this application. Detailed Implementation

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] This application provides a speed control circuit, device, and vehicle for an air conditioner condenser fan. By adjusting the speed of the air conditioner condenser fan through the real-time speed signal of the fan, the energy consumption is reduced while meeting system requirements, and the aging rate of the coil on the fan is slowed down, thereby improving overall working efficiency and reducing fuel consumption.

[0034] Please refer to Figure 2The air conditioning system of the vehicle provided in this application includes an air conditioning AC switch, a thermostat, a pressure switch, a blower switch, a blower motor, a blower speed control resistor, a blower relay, an air conditioning relay, a compressor, and a condenser. The compressor is equipped with an electromagnetic clutch, the air conditioning AC switch is equipped with an indicator light, and the condenser is equipped with a fan motor to drive the condenser fan to rotate.

[0035] The first terminal of the solenoid coil of the blower relay is connected to the COM pin of the blower switch, the negative terminal of the temperature controller, and the negative terminal A1 of the indicator light. Figure 2 The lower electrode of the indicator light is connected to the circuit. The second terminal of the blower relay's electromagnetic coil is connected to the vehicle's second ignition switch IG2. The first normally closed contact of the blower relay is connected to the input terminal of the blower motor, and the second normally closed contact of the blower relay is connected to the vehicle's power output terminal B+.

[0036] With the blower switch set to L position, the resistance is highest and the airflow is lowest when the blower is connected to R → R → R → ground; with ML position, the resistance and airflow are moderate when the blower is connected to R → R → ground; with MH position, the resistance and airflow are moderate when the blower is connected to R → ground; and with HI position, the resistance is lowest and the airflow is highest when the blower is connected to ground.

[0037] The positive terminal of the thermostat is the same as the positive terminal of the indicator light A6. Figure 2 The upper electrode of the indicator light is connected. The control terminal L of the thermostat is connected to the first terminal of the electromagnetic coil of the air conditioning relay via a pressure switch. The second terminal of the electromagnetic coil of the air conditioning relay is connected to the first normally closed contact of the blower relay. The first normally open contact of the air conditioning relay is connected to the compressor and condenser, and the second normally open contact of the air conditioning relay is connected to the vehicle's first ignition switch IG1.

[0038] like Figure 1 As shown, the air conditioner condenser fan speed control circuit provided in this application includes a speed sensor 110, an adjustment direction control circuit 120, and a speed control circuit 130. The speed sensor 110 is fixed to the air conditioner condenser fan. The output terminal of the speed sensor 110 is connected to the input terminal of the adjustment direction control circuit 120. The adjustment direction control circuit receives the air conditioner condenser fan speed signal input from the speed sensor and outputs a pulse signal to the speed control circuit based on the speed signal. The output terminal of the adjustment direction control circuit 120 is connected to the input terminal of the speed control circuit 130. The output terminal of the speed control circuit 130 is connected to the input terminal of the air conditioner condenser fan motor. The speed control circuit 130 generates a speed control signal based on the pulse signal and outputs it to the fan motor to control the fan motor speed.

[0039] Figure 2 An embodiment of this application is shown. For example... Figure 2As shown, the direction control circuit 120 includes an input signal processing circuit 1201 and a signal generator 1202. The input terminal of the input signal processing circuit 1201 is connected to the output terminal of the speed sensor 110, and the output terminal of the input signal processing circuit 1201 is connected to the input terminal of the signal generator 1202. The input signal processing circuit receives the speed signal of the air conditioner condenser fan from the speed sensor and outputs a voltage signal to the signal generator based on the speed signal. The output terminal of the signal generator 1202 is connected to the input terminal of the speed control circuit 130. The signal generator generates a pulse signal based on the voltage signal and outputs it to the speed control circuit.

[0040] like Figure 2 As shown, the input signal processing circuit 1201 includes a third transistor Q3 and a first capacitor C1. The base of the third transistor Q3 is connected to the speed sensor 110 ( Figure 2 The transistor Q1 is connected to the power supply. The collector of the third transistor Q3 is connected to the power supply through the second resistor R2. The emitter of the third transistor Q3 is grounded.

[0041] Preferably, a sixth resistor R6 is provided between the speed sensor D1 and the base of the third transistor Q3 to limit current.

[0042] The first terminal of the first capacitor C1 is connected to the collector of the third transistor Q3, and the second terminal of the first capacitor C1 is connected to the input terminal of the signal generator 1202.

[0043] Preferably, a diode D2 and a fifth resistor R5 are connected in parallel between the second terminal of the first capacitor C1 and the power supply. The diode D2 prevents the current from flowing in reverse, and the fifth resistor R5 is used to limit the current.

[0044] As one embodiment, the signal generator 1202 is a single-time base circuit. As one embodiment, the single-time base circuit may be a CB555 timer circuit.

[0045] Specifically, the second pin 2 of the single-time base circuit is connected to the output terminal of the input signal processing circuit 1201 (i.e., the second end of the first capacitor C1), the third pin 3 of the single-time base circuit is connected to the input terminal of the speed control circuit 130, the fourth pin 4 and the eighth pin 8 of the single-time base circuit are both connected to the power supply, and the first pin 1 of the single-time base circuit is grounded.

[0046] Preferably, the direction control circuit 120 further includes a discharge circuit 1203, which includes a third resistor R3 and a second capacitor C2. The first end of the third resistor R3 is connected to the power supply, and the second end of the third resistor R3 is connected to the first end of the second capacitor C2. The second end of the second capacitor C2 is grounded. The sixth pin 6 and the seventh pin 7 of the single-time base circuit are both connected to the first end of the second capacitor C2.

[0047] like Figure 2 As shown, the speed control circuit 130 includes a first transistor Q1 and a second transistor Q2. The base of the first transistor Q1 is connected to the output terminal of the direction adjustment control circuit 120 (i.e., pin 3 of the single-timer circuit), the collector of the first transistor Q1 is connected to the power supply through a first resistor R1, and the emitter of the first transistor Q1 is grounded. The base of the second transistor Q2 is connected to the collector of the first transistor Q1, the collector of the second transistor Q2 is connected to the power supply, and the emitter of the second transistor Q2 is connected to the input terminal of the condenser fan motor.

[0048] Preferably, such as Figure 1 and 2 As shown, the speed control circuit also includes a voltage divider circuit 140, which includes an adjustable resistor RT1 and a fourth resistor R4. The first end of the adjustable resistor RT1 is connected to the power supply, the second end of the adjustable resistor RT1 is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is grounded.

[0049] It should be noted that in the air conditioning condenser fan speed control circuit, the power supply refers to the vehicle's first ignition power supply IG1.

[0050] The principle is explained as follows: Pin 1 of the single-time base circuit is grounded, and pin 5 is the control terminal, which controls the first threshold voltage of the chip, 1 / 3VCC. Pin 2 is the trigger terminal. When the voltage of pin 2 is less than or equal to the threshold voltage (1 / 3VCC) set by pin 5 and the voltage of pin 6 is less than or equal to the second threshold voltage (2 / 3VCC), pin 3 (output terminal) outputs a high level. Pin 7 is the discharge control terminal. When the voltage of pin 2 is greater than the threshold voltage (1 / 3VCC) set by pin 5 and the voltage of pin 6 is greater than the second threshold voltage (2 / 3VCC), pin 3 (output terminal) outputs a low level, and pin 7 is simultaneously turned on, causing the discharge circuit 1203 to discharge. When the voltage of pin 2 is less than or equal to the threshold voltage (1 / 3VCC) set by pin 5 and the voltage of pin 6 is greater than the second threshold voltage (2 / 3VCC), pin 3 (output terminal) has no output.

[0051] During operation, manually changing the resistance of the adjustable resistor RT1 alters the voltage across its second terminal, thus changing the threshold voltage (1 / 3 VCC) at pin 5. This change in VCC, in turn, alters the second threshold voltage (2 / 3 VCC). Decreasing the resistance of RT1 increases the voltage across its second terminal, raising the threshold voltage at pin 5 and reducing the target speed (maximum speed) of the fan motor. Conversely, increasing the resistance of RT1 decreases the voltage across its second terminal, lowering the threshold voltage at pin 5 and increasing the target speed of the fan motor. This achieves the purpose of regulating the condenser fan speed.

[0052] The condenser fan is driven by a fan motor, and the speed of the condenser fan motor is measured by a speed sensor D1. When the fan starts, the voltage at pin 2 of signal generator 1202 is the same as the power supply voltage.

[0053] The speed sensor D1 generates a square wave signal when measuring speed. When the square wave signal is high, Q3 conducts, causing the first capacitor C1 to discharge. The voltage at pin 2 of signal generator 1202 gradually decreases. If the voltage at pin 2 of signal generator 1202 is greater than 1 / 3 VCC and the voltage at pin 6 is greater than 2 / 3 VCC, then pin 3 outputs a low-level signal. At this time, Q1 is cut off and Q2 conducts, increasing the speed of the condenser fan motor. Simultaneously, pin 7 opens, causing the discharge circuit 1203 to discharge, and the voltage at pin 6 gradually decreases. When the voltage at pin 2 of signal generator 1202 drops below 1 / 3 VCC and the voltage at pin 6 drops below 2 / 3 VCC, pin 3 starts outputting a high-level signal. At this time, Q1 conducts and Q2 is cut off, decreasing the speed of the condenser fan motor. Simultaneously, pin 7 disconnects, charging the discharge circuit 1203.

[0054] When the square wave signal is low, Q3 is off, causing the first capacitor C1 to charge, and the voltage at pin 2 of signal generator 1202 gradually increases. If the voltage at pin 2 of signal generator 1202 is less than or equal to 1 / 3 VCC, and the voltage at pin 6 is less than or equal to 2 / 3 VCC, then pin 3 starts outputting a high-level signal. At this time, Q1 is on and Q2 is off, causing the condenser fan motor speed to decrease. Simultaneously, pin 7 is off, causing the discharge circuit 1203 to charge. When the voltage at pin 2 of signal generator 1202 is greater than 1 / 3 VCC, and the voltage at pin 6 is greater than 2 / 3 VCC, pin 3 outputs a low-level signal. At this time, Q1 is off and Q2 is on, causing the condenser fan motor speed to increase. Simultaneously, pin 7 is on, causing the discharge circuit 1203 to discharge, and the voltage at pin 6 gradually decreases.

[0055] If the voltage at pin 2 is less than or equal to the threshold voltage (1 / 3VCC) set at pin 5 and the voltage at pin 6 is greater than the second threshold voltage (2 / 3VCC), there is no output at pin 3. At this time, Q1 is cut off and Q2 is turned on, which increases the speed of the condenser fan motor.

[0056] When the condenser fan motor speed increases, the frequency of the square wave signal generated by the speed sensor D1 increases, the duration of pin 2 being below 1 / 3 VCC increases, the duration of pin 3 outputting a high level increases, the on-time of Q2 increases, and the off-time of Q3 increases. This increases the time it takes for the condenser fan motor speed to decrease, thus reducing the average speed of the condenser fan motor within one cycle. Conversely, when the condenser fan motor speed decreases, the frequency of the square wave signal generated by the speed sensor D1 decreases, the duration of pin 2 being below 1 / 3 VCC decreases, the duration of pin 3 outputting a high level decreases, the on-time of Q2 decreases, and the off-time of Q3 decreases. This reduces the time it takes for the condenser fan motor speed to decrease, thus increasing the average speed of the condenser fan motor within one cycle. Therefore, by dynamically adjusting the condenser fan speed, it can be stabilized near the target speed.

[0057] Based on the above, this application also provides a speed control device for an air conditioner condenser fan, which includes the aforementioned speed control circuit for the air conditioner condenser fan.

[0058] Based on the above, this application also provides a vehicle that includes the aforementioned air conditioning condenser fan speed control device.

[0059] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A speed control circuit for an air conditioner condenser fan, characterized in that, This includes a speed sensor, a direction adjustment control circuit, and a speed control circuit; The speed sensor is fixed on the air conditioner condenser fan. The output terminal of the speed sensor is connected to the input terminal of the adjustment direction control circuit. The output terminal of the adjustment direction control circuit is connected to the input terminal of the speed control circuit. The output terminal of the speed control circuit is connected to the input terminal of the motor of the air conditioner condenser fan. The adjustment direction control circuit is used to receive the speed signal of the air conditioner condenser fan input by the speed sensor, and output a pulse signal to the speed control circuit according to the speed signal; The speed control circuit generates a speed control signal based on the pulse signal and outputs it to the motor; The adjustment direction control circuit includes an input signal processing circuit and a signal generator; The input terminal of the input signal processing circuit is connected to the output terminal of the speed sensor, the output terminal of the input signal processing circuit is connected to the input terminal of the signal generator, and the output terminal of the signal generator is connected to the input terminal of the speed control circuit. The input signal processing circuit is used to receive the speed signal of the air conditioner condenser fan input by the speed sensor, and output a voltage signal to the signal generator according to the speed signal; The signal generator generates a pulse signal based on the voltage signal and outputs it to the speed control circuit; The adjustment direction control circuit further includes a discharge circuit, which includes a third resistor and a second capacitor. The first end of the third resistor is connected to the power supply, the second end of the third resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded. The signal generator is a single-time base circuit. The second pin of the single-time base circuit is connected to the output terminal of the input signal processing circuit, the third pin of the single-time base circuit is connected to the input terminal of the speed control circuit, and the sixth and seventh pins of the single-time base circuit are both connected to the first terminal of the second capacitor.

2. The air conditioner condenser fan speed control circuit according to claim 1, characterized in that, The speed control circuit includes a first transistor and a second transistor; The base of the first transistor is connected to the output terminal of the direction adjustment control circuit, the collector of the first transistor is connected to the power supply through the first resistor, and the emitter of the first transistor is grounded. The base of the second transistor is connected to the collector of the first transistor, the collector of the second transistor is connected to the power supply, and the emitter of the second transistor is connected to the input terminal of the motor.

3. The air conditioner condenser fan speed control circuit according to claim 1, characterized in that, The input signal processing circuit includes a third transistor and a first capacitor; The base of the third transistor is connected to the power supply through the speed sensor, the collector of the third transistor is connected to the power supply through the second resistor, and the emitter of the third transistor is grounded. The first terminal of the first capacitor is connected to the collector of the third transistor, and the second terminal of the first capacitor is connected to the input terminal of the signal generator.

4. The air conditioner condenser fan speed control circuit according to claim 1, characterized in that, The speed control circuit further includes a voltage divider circuit, which includes an adjustable resistor and a fourth resistor. The first end of the adjustable resistor is connected to the power supply, the second end of the adjustable resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded.

5. The air conditioner condenser fan speed control circuit according to claim 3, characterized in that, A diode and a fifth resistor are connected in parallel between the second terminal of the first capacitor and the power supply.

6. A speed control device for an air conditioner condenser fan, characterized in that, The air conditioner condenser fan speed control device includes the air conditioner condenser fan speed control circuit according to any one of claims 1-5.

7. A vehicle, characterized in that, The vehicle includes the air conditioning condenser fan speed control device as described in claim 6.

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