Motor control method for push-out vehicle refrigerator

Abstract

The present invention discloses a motor control method for a push-out vehicle refrigerator, wherein the vehicle refrigerator comprises a box body, a cavity arranged in the box body, a drawer arranged in the cavity, a motor arranged in the box body, a motor push-out slider arranged at the output end of the motor and located in the cavity, and a temperature sensor for detecting the temperature in the cavity. A door opening switch is arranged on the surface of the box body. When the temperature in the cavity is lower, the motor adjusts the overall output voltage of the motor with a higher PWM duty cycle, thereby increasing the thrust of the motor, so that the increased sliding friction of the motor push-out slider at low temperature is offset, thereby ensuring the output performance of the motor, and the drawer can be smoothly pushed out of the cavity. Through this scheme, the motor adjusts different PWM duty cycles according to different temperatures, so that the power and speed of the motor push-out slider to drive the drawer to the outside of the cavity are the same at each temperature, the stability is stronger, and more energy is saved.

Description

Technical Field

[0001] The invention relates to the field of vehicle-mounted refrigerators, and in particular to a motor control method for a push-out vehicle-mounted refrigerator. Background Art

[0002] A push-out vehicle refrigerator is a type of vehicle refrigerator, which includes a box, a cavity disposed in the box, a drawer disposed in the cavity, a motor disposed in the box, a motor push-out slider disposed at the motor output end and located in the cavity, and a temperature sensor for detecting the temperature in the cavity. The surface of the box is provided with a door opening switch, wherein the motor push-out slider is used to push the drawer out of the cavity. In current push-out vehicle refrigerators, the motor has the same push-out speed and force at different temperatures. However, in actual application, due to the principle of thermal expansion and contraction, when the temperature in the cavity is different, the sliding friction of the motor push-out slider during movement will change. Specifically, the lower the temperature in the cavity, the greater the sliding friction of the motor push-out slider during movement. The increased sliding friction will affect the output performance of the motor, which causes the motor to run at maximum power at all temperatures, thereby increasing energy consumption. Summary of the invention

[0003] To solve the above problems, the purpose of the present invention is to provide a motor control logic for a vehicle refrigerator, so that when the temperature in the cavity is lower, the PWM duty cycle of the motor is compensated, thereby increasing the PWM duty cycle of the motor and thus increasing the thrust of the motor.

[0004] The technical solution adopted by the present invention to solve the problem is: a motor control method for a push-out vehicle refrigerator, wherein the vehicle refrigerator comprises a box, a cavity arranged in the box, a drawer arranged in the cavity, a motor arranged in the box, a motor push-out slider arranged at the output end of the motor and located in the cavity, and a temperature sensor for detecting the temperature in the cavity, wherein a door opening switch is arranged on the surface of the box, wherein the motor push-out slider is used to push the drawer out of the cavity, and the control logic of the motor is as follows:

[0005] Set the temperature from high to low (T0, T1], (T1, T2]... (Tn-1, Tn], where Tn <Tn-1;

[0006] The PWM duty cycle of the motor is set from low to high to P1, P2...Pn, where Pn>Pn-1;

[0007] When the temperature T in the cavity falls within the range of (Ta-1,Ta], after the door opening switch is triggered, the motor drives the motor to push out the slider and run at a duty cycle of Pa.

[0008] As a further improvement of the above technical solution, n=11, T0=+∞, T1=10, T2=9, T3=8...T9=1, T10=0, T11=-∞, except for T0 and T11, (Ta-1)-(Ta)=1;

[0009] P1=30%, P11=50%, Pn=(Pn-1)+2%.

[0010] As a further improvement of the above technical solution, an initial button electrically connected to the motor is provided on the surface of the vehicle refrigerator. When the user long presses the initial button, the motor drives the motor to push out the slider and runs continuously with a PWM duty cycle of 100%.

[0011] As a further improvement of the above technical solution, the time during which the motor runs with a PWM duty cycle of 100% is equal to the duration of the user pressing the initial key.

[0012] As a further improvement of the above technical solution, a detection sensor is provided in the cavity at the end of the moving stroke of the motor push-out slider. When the door opening switch is triggered, if the detection sensor does not detect the motor push-out slider after an interval time S, it is assumed that the motor push-out slider encounters ice blockage and an error is reported.

[0013] The beneficial effect of the present invention is that through this scheme, when the temperature inside the cavity is lower, the motor adjusts the overall output voltage of the motor with a higher PWM duty cycle, thereby increasing the thrust of the motor, so that the increased sliding friction of the motor push-out slider at low temperature is offset, thereby ensuring the output performance of the motor, and the drawer can be smoothly pushed out of the cavity. Through this scheme, the motor adjusts different PWM duty cycles according to different temperatures, so that the power and speed of the motor push-out slider to drive the drawer to the outside of the cavity at each temperature are the same, the stability is stronger, and more energy is saved. DETAILED DESCRIPTION

[0014] A motor control method for a push-out vehicle refrigerator, wherein the vehicle refrigerator comprises a box, a cavity disposed in the box, a drawer disposed in the cavity, a motor disposed in the box, a motor push-out slider disposed at the output end of the motor and located in the cavity, and a temperature sensor for detecting the temperature in the cavity, wherein a door opening switch is disposed on the surface of the box, wherein the motor push-out slider is used to push the drawer out of the cavity, and the control logic of the motor is as follows:

[0015] Set the temperature from high to low (T0, T1], (T1, T2]... (Tn-1, Tn], where Tn <Tn-1;

[0016] The PWM duty cycle of the motor is set from low to high to P1, P2...Pn, where Pn>Pn-1;

[0017] When the temperature T in the cavity falls within the range of (Ta-1,Ta], after the door opening switch is triggered, the motor drives the motor to push out the slider and run at a duty cycle of Pa.

[0018] PWM duty cycle refers to the proportion of power-on time to the total time in a pulse cycle. Through this solution, when the temperature inside the cavity is lower, the motor adjusts the overall output voltage of the motor with a higher PWM duty cycle, thereby increasing the thrust of the motor and offsetting the increased sliding friction of the motor push-out slider at low temperatures, thereby ensuring the output performance of the motor and allowing the drawer to be pushed out of the cavity smoothly. Through this solution, the motor adjusts different PWM duty cycles according to different temperatures, so that the power and speed of the motor push-out slider to drive the drawer out of the cavity at each temperature are the same, with greater stability and more energy saving.

[0019] In the first implementation of the present scheme, n=11, T0=+∞, T1=10, T2=9, T3=8...T9=1, T10=0, T11=-∞, except for T0 and T11, (Ta-1)-(Ta)=1;

[0020] P1=30%, P11=50%, Pn=(Pn-1)+2%.

[0021] In the second implementation of the present scheme, n=20, T0=+∞, T1=28, T2=26, T3=24...T20=-10, in which state, (Ta-1)-(Ta)=2;

[0022] Said P1=20%, P2=23%, P3=26%, ... P20=77%.

[0023] When the temperature is below 0 degrees, if the humidity in the cavity is high, the moisture in the air may condense into ice on the moving path of the motor push-out slider to block the movement of the motor push-out slider. This fault is called ice blockage. It is often difficult for the motor to break the ice at a low PWM duty cycle, resulting in the drawer being unable to be pushed out. Therefore, it is preferred that an initial button electrically connected to the motor is provided on the surface of the vehicle refrigerator. When the user long presses the initial button, the motor drives the motor push-out slider to continue running with a PWM duty cycle of 100%, so that the motor drives the motor push-out slider to move with maximum thrust, thereby achieving an ice-breaking effect. In this process, it is preferred that the time for the motor to run at a PWM duty cycle of 100% is equal to the duration for which the user presses the initial button.

[0024] In order to enable users to clearly know the occurrence of ice blockage failure, it is preferred that a detection sensor is provided in the cavity at the end of the moving stroke of the motor push-out slider. When the door opening switch is triggered, after an interval S, if the detection sensor does not detect the motor push-out slider, it is assumed that the motor push-out slider encounters ice blockage and an error is reported.

[0025] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the present invention specification under the inventive concept of the present invention, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor control method for a push-out vehicle refrigerator, wherein the vehicle refrigerator comprises a box, a cavity disposed in the box, a drawer disposed in the cavity, a motor disposed in the box, a motor push-out slider disposed at the output end of the motor and located in the cavity, and a temperature sensor for detecting the temperature in the cavity, wherein a door opening switch is disposed on the surface of the box, wherein the motor push-out slider is used to push the drawer out of the cavity, and ... The control logic of the motor is as follows: Set the temperature from high to low (T0, T1], (T1, T2]... (Tn-1, Tn], where Tn <Tn-1; The PWM duty cycle of the motor is set from low to high to P1, P2...Pn, where Pn>Pn-1; When the temperature T in the cavity falls within the range of (Ta-1,Ta], after the door opening switch is triggered, the motor drives the motor to push out the slider and run at a duty cycle of Pa.

2. The motor control method of a push-out vehicle refrigerator according to claim 1, characterized in that: n=10,T0=+∞,T1=10,T2=9,T3=8……T9=1,T10=0,T11=-∞,except T0 and T11,(Ta-1)-(Ta)=1; P1=30%, P11=50%, Pn=(Pn-1)+2%.

3. The motor control method of a push-out vehicle refrigerator according to claim 1, characterized in that: The surface of the vehicle refrigerator is provided with an initial button electrically connected to the motor. When the user long presses the initial button, the motor drives the motor to push out the slider and continuously runs with a PWM duty cycle of 100%.

4. The motor control method of a push-out vehicle refrigerator according to claim 3, characterized in that: The motor runs at 100% PWM duty cycle for the same duration as the user presses the initial key.

5. The motor control method of a push-out vehicle refrigerator according to claim 3, characterized in that: A detection sensor is provided in the cavity at the end of the moving stroke of the motor push-out slider. When the door opening switch is triggered, if the detection sensor does not detect the motor push-out slider after an interval S, it is assumed that the motor push-out slider encounters ice blockage and an error is reported.