Limit control switching wire harness

Abstract

The utility model discloses a limit control switching wire harness, one end of the limit control switching wire harness is electrically connected with a control panel, the other end of the limit control switching wire harness is electrically connected with an evaporator wire harness, and the limit control switching wire harness comprises an evaporation fan three-gear relay, a PTC high-gear relay and a first fly-wheel diode. The control panel comprises a three-gear knob switch, a high gear of the three-gear knob switch is connected to a three-gear relay of the evaporation fan through a cable, and the high gear of the three-gear knob switch is connected to a PTC high-gear relay through a cable. The limiting control switching wire harness disclosed by the utility model has the beneficial effects that the limiting control switching wire harness is introduced between a control panel and an evaporator wire harness, so that an evaporation fan three-gear relay is associated with a PTC (Positive Temperature Coefficient) high-gear relay, and the evaporation fan, a speed regulating resistor and a main air outlet of a cab are prevented from being damaged due to misoperation.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning cable technology, specifically relating to a limit control adapter harness. Background Art

[0002] The utility model patent with publication number CN202275762U and subject name is "Electronic Switch for Airflow Adjustment of Top-Mounted Evaporator in Automotive Air Conditioner". Its IPC classification number is H01H15 / 00 and F24F11 / 02. Its technical solution discloses that "the connection between the brush 4 and the circuit board 2 forms a 7-position switch to provide 7-position control signals to the circuit board 2. The circuit board 2 outputs a power signal to the load evaporator motor through the connector 5 and the wiring harness to achieve the purpose of adjusting the motor airflow".

[0003] The above-disclosed utility model patent discloses a connection between the circuit board and the load evaporator motor via connectors and wiring harnesses. In fact, wiring harnesses can be used not only to connect the circuit board and the load evaporator motor, but also, as a core component of a knob-panel air conditioner, to link the high-level output of the air conditioner evaporator fan with the high-level operation of the PTC heater.

[0004] Traditional air conditioning control panels are mechanical, and the fan speed control switch and heating speed control switch are not linked. When users (for example, drivers) need PTC heating, they often initially select both the high setting for the evaporator fan and the high setting for the PTC heater. After running for a certain period (for example, about 40 minutes), the temperature in the target area (for example, the driver's cab) rises to a comfortable level. If both the evaporator fan and PTC heater remain at their high settings, it can cause discomfort for the user. Normally, the user should then adjust the heating knob (and the PTC heater knob) to a low setting (level 1). However, due to user error, they may directly adjust the evaporator fan to level 1 (the lowest fan speed) while keeping the PTC heater at its high setting (level 2). This can easily lead to excessively high air outlet temperatures, causing the vehicle's air conditioning vents to melt and deform, and damaging components such as the evaporator fan and speed control resistor, posing safety hazards. Utility Model Content

[0005] This utility model addresses the shortcomings of the existing technology by providing a limit control adapter harness.

[0006] This utility model adopts the following technical solution: one end of the limit control adapter harness is electrically connected to the control panel, and the other end of the limit control adapter harness is electrically connected to the evaporator harness. The limit control adapter harness includes a three-speed relay for the evaporator fan, a high-speed PTC relay, and a first freewheeling diode, wherein:

[0007] The control panel includes a three-position rotary switch. The high position of the three-position rotary switch is connected to the three-position relay of the evaporator fan via a cable, and the high position of the three-position rotary switch is connected to the high position relay of the PTC via a cable.

[0008] The control panel includes a two-position rotary switch, and the first output of the two-position rotary switch is connected to a PTC high-end relay via a cable.

[0009] The positive terminal of the first freewheeling diode is electrically connected to the three-position relay of the evaporator fan, and the negative terminal of the first freewheeling diode is electrically connected to the three-position relay of the evaporator fan.

[0010] As a further preferred technical solution to the above technical solutions, the control panel also includes a thermostat, which includes a potentiometer, an integrated circuit, and a relay coil. The input terminal of the integrated circuit is electrically connected to the potentiometer, and the output terminal of the integrated circuit is electrically connected to the relay coil.

[0011] As a further preferred technical solution to the above technical solution, a second freewheeling diode is connected between the first output terminal and the second output terminal of the two-position rotary switch. The positive terminal of the second freewheeling diode is electrically connected to the first output terminal of the two-position rotary switch, and the negative terminal of the second freewheeling diode is electrically connected to the second output terminal of the two-position rotary switch.

[0012] As a further preferred technical solution to the above technical solutions, the low position of the three-position rotary switch is electrically connected to the evaporator wiring harness via a cable, and the medium position of the three-position rotary switch is electrically connected to the evaporator wiring harness via a cable.

[0013] As a further preferred technical solution to the above technical solutions, the relay coil is electrically connected to the evaporator wiring harness via a cable, the potentiometer is electrically connected to the evaporator wiring harness via a cable, and the input terminal of the integrated circuit is electrically connected to the evaporator wiring harness via a cable.

[0014] This application also discloses a limit control adapter harness located in the driver's cab. One end of the limit control adapter harness is electrically connected to the control panel, and the other end is electrically connected to the evaporator wiring harness. The limit control adapter harness includes a three-position evaporator fan relay, a high-position PTC relay, and a first freewheeling diode, wherein:

[0015] The control panel includes a three-position rotary switch. The high position of the three-position rotary switch is connected to the three-position relay of the evaporator fan via a cable, and the high position of the three-position rotary switch is connected to the high position relay of the PTC via a cable.

[0016] The control panel includes a two-position rotary switch, and the first output of the two-position rotary switch is connected to a PTC high-end relay via a cable.

[0017] The positive terminal of the first freewheeling diode is electrically connected to the three-position relay of the evaporator fan, and the negative terminal of the first freewheeling diode is electrically connected to the three-position relay of the evaporator fan.

[0018] The limit control adapter harness disclosed in this utility model has the advantage of introducing this limit control adapter harness between the control panel and the evaporator harness, so that the three-speed relay of the evaporator fan and the high-speed relay of the PTC are interconnected, thus avoiding damage to the evaporator fan, speed control resistor and main air outlet of the cab due to misoperation. Attached Figure Description

[0019] Figure 1 This is the wiring diagram for this application.

[0020] Figure 2 This is the control principle diagram of this application.

[0021] Figure reference numerals: 100-Evaporator fan three-position relay; 110-First freewheeling diode; 200-PTC high-position relay; 300-Control panel; 310-Three-position rotary switch; 320-Two-position rotary switch; 321-Second freewheeling diode; 330-Thermostat; 331-Polypotentiometer; 332-Integrated circuit; 333-Relay coil; 400-Evaporator wiring harness. Detailed Implementation

[0022] This utility model discloses a limit control adapter harness. The following description, in conjunction with a preferred embodiment (Embodiment 1), refers to the accompanying drawings. Figure 1-2 The specific embodiments of this utility model are further described in Tables 1-2 of the appendix.

[0023] See attached diagram. Figure 1 , Figure 1 The wiring method of the limit control adapter harness is shown. Figure 2 The control principle of the limit control adapter harness is shown.

[0024] Those skilled in the art should note that in the various embodiments of this application, the QVR that may be involved is defined as the Chinese national standard line; and the AVSS that may be involved is defined as the Japanese standard line.

[0025] Example 1 (limit control adapter harness, one end of which is electrically connected to the control panel 300).

[0026] See attached diagram. Figure 1-2 Preferably, the limit control adapter harness has one end electrically connected to the control panel 300 and the other end electrically connected to the evaporator harness 400. The limit control adapter harness includes an evaporator fan three-position relay 100, a PTC high-position relay 200, and a first freewheeling diode 110, wherein:

[0027] The control panel 300 includes a three-position rotary switch 310. The high position of the three-position rotary switch 310 is connected to the three-position relay 100 of the evaporator fan via a cable. The high position of the three-position rotary switch 310 is also connected to the high position relay 200 of the PTC via a cable.

[0028] The control panel 300 includes a two-position rotary switch 320, and the first output terminal of the two-position rotary switch 320 is connected to a PTC high-end relay 200 via a cable.

[0029] The positive terminal of the first freewheeling diode 110 is electrically connected to the three-position relay 100 of the evaporator fan, and the negative terminal of the first freewheeling diode 110 is electrically connected to the three-position relay 100 of the evaporator fan.

[0030] The control panel 300 also includes a temperature controller 330, which includes a potentiometer 331, an integrated circuit 332, and a relay coil 333. The input terminal of the integrated circuit 332 is electrically connected to the potentiometer 331, and the output terminal of the integrated circuit 332 is electrically connected to the relay coil 333.

[0031] A second freewheeling diode 321 is connected between the first output terminal and the second output terminal of the two-position rotary switch 320. The positive terminal of the second freewheeling diode 321 is electrically connected to the first output terminal of the two-position rotary switch 320, and the negative terminal of the second freewheeling diode 321 is electrically connected to the second output terminal of the two-position rotary switch 320.

[0032] The low position of the three-position rotary switch 310 is electrically connected to the evaporator wiring harness 400 via a cable, and the medium position of the three-position rotary switch 310 is electrically connected to the evaporator wiring harness 400 via a cable.

[0033] Among them, the relay coil 333 is electrically connected to the evaporator wiring harness 400 via a cable, the potentiometer 331 is electrically connected to the evaporator wiring harness 400 via a cable, and the input terminal of the integrated circuit 332 is electrically connected to the evaporator wiring harness 400 via a cable.

[0034] Among them, the TB6318 is preferred for the three-speed relay 100 of the evaporator fan.

[0035] Among them, the TB6318 is preferred for the PTC high-end relay 200.

[0036] The first freewheeling diode 110 is preferably a T6006B, which is used on the (ordinary) line position adapter harness.

[0037] The second freewheeling diode 321 is preferably a T6006C, located on the (waterproof) panel.

[0038] See attached diagram. Figure 1-2The following describes the control principle of the limit control adapter harness disclosed in this embodiment.

[0039] Specifically, the limit control adapter harness disclosed in this application has one end plugged into the control panel 300 and the other end plugged into the evaporator wiring harness 400. Introducing this limit control adapter harness between the control panel 300 and the evaporator wiring harness 400 interconnects the evaporator fan three-position relay 100 and the PTC high-position relay 200. In other words, when the driver wants to operate the PTC high-position relay 200, the three-position rotary switch 310 must be set to position 3 (high position). When the three-position rotary switch 310 is operating in positions 1-2, the PTC high-position relay 200 defaults to low-position operation regardless of whether it is in a low or high position, thus effectively preventing damage to the evaporator fan, speed control resistor, and main air outlet of the cab due to misoperation.

[0040] Among them, as shown in the attached figure Figure 1-2 As shown, a cable is led out from the high position (H) of the three-position rotary switch 310 to the three-position relay 100 (pin 85) of the evaporator fan, and another cable is led out from the high position (H) of the three-position rotary switch 310 to the high position relay 200 (pin 85) of the PTC.

[0041] When the low (L, i.e., position 1, the same below) and medium (M, i.e., position 2, the same below) positions of the three-position rotary switch 310 are turned on, the high (H, i.e., position 3, the same below) position of the three-position rotary switch 310 has no output signal. In addition, the PTC high-position relay 200 defaults to low-position operation, so regardless of the current position of the three-position rotary switch 310, the PTC high-position relay 200 will operate in low-position or high-position operation. Only when the high (H) position of the three-position rotary switch 310 has an output (the three-position rotary switch 310 is turned to high-position (H)), the PTC high-position relay 200 can operate in either low-position or high-position operation depending on the low or high position output signal of the two-position rotary switch 320.

[0042] The purpose of adding a first freewheeling diode 110 between pin 85 and pin 86 of the three-position relay of the evaporator fan is to prevent the high voltage or large current that may be mistakenly output by the speed regulating resistor 330 when the three-position rotary switch 310 is running in position 1-2, so as to prevent the limit control adapter harness from failing.

[0043] A second freewheeling diode 321 is added between the first and second output terminals of the two-position rotary switch 320 to prevent the first and second output terminals of the two-position rotary switch 320 from erroneously outputting high voltage or high current, which could cause the limit control adapter harness to fail.

[0044] It is worth mentioning that the specific selection and connection method of the cable in this embodiment are detailed in Tables 1-2 of the appendix.

[0045] Example 2 (The limit control adapter harness is located in the cab, and one end of the limit control adapter harness is electrically connected to the control panel 300).

[0046] See attached diagram. Figure 1-2 Preferably, the limit control adapter harness is located in the driver's cab. One end of the limit control adapter harness is electrically connected to the control panel 300, and the other end is electrically connected to the evaporator harness 400. The limit control adapter harness includes an evaporator fan three-position relay 100, a PTC high-position relay 200, and a first freewheeling diode 110, wherein:

[0047] The control panel 300 includes a three-position rotary switch 310. The high position of the three-position rotary switch 310 is connected to the three-position relay 100 of the evaporator fan via a cable. The high position of the three-position rotary switch 310 is also connected to the high position relay 200 of the PTC via a cable.

[0048] The control panel 300 includes a two-position rotary switch 320, and the first output terminal of the two-position rotary switch 320 is connected to a PTC high-end relay 200 via a cable.

[0049] The positive terminal of the first freewheeling diode 110 is electrically connected to the three-position relay 100 of the evaporator fan, and the negative terminal of the first freewheeling diode 110 is electrically connected to the three-position relay 100 of the evaporator fan.

[0050] The control panel 300 also includes a temperature controller 330, which includes a potentiometer 331, an integrated circuit 332, and a relay coil 333. The input terminal of the integrated circuit 332 is electrically connected to the potentiometer 331, and the output terminal of the integrated circuit 332 is electrically connected to the relay coil 333.

[0051] A second freewheeling diode 321 is connected between the first output terminal and the second output terminal of the two-position rotary switch 320. The positive terminal of the second freewheeling diode 321 is electrically connected to the first output terminal of the two-position rotary switch 320, and the negative terminal of the second freewheeling diode 321 is electrically connected to the second output terminal of the two-position rotary switch 320.

[0052] The low position of the three-position rotary switch 310 is electrically connected to the evaporator wiring harness 400 via a cable, and the medium position of the three-position rotary switch 310 is electrically connected to the evaporator wiring harness 400 via a cable.

[0053] Among them, the relay coil 333 is electrically connected to the evaporator wiring harness 400 via a cable, the potentiometer 331 is electrically connected to the evaporator wiring harness 400 via a cable, and the input terminal of the integrated circuit 332 is electrically connected to the evaporator wiring harness 400 via a cable.

[0054] Among them, the TB6318 is preferred for the three-speed relay 100 of the evaporator fan.

[0055] Among them, the TB6318 is preferred for the PTC high-end relay 200.

[0056] The first freewheeling diode 110 is preferably a T6006B, which is used on the (ordinary) line position adapter harness.

[0057] The second freewheeling diode 321 is preferably a T6006C, located on the (waterproof) panel.

[0058] See attached diagram. Figure 1-2 The following describes the control principle of the limit control adapter harness disclosed in this embodiment.

[0059] Specifically, the limit control adapter harness disclosed in this application has one end plugged into the control panel 300 and the other end plugged into the evaporator wiring harness 400. Introducing this limit control adapter harness between the control panel 300 and the evaporator wiring harness 400 interconnects the evaporator fan three-position relay 100 and the PTC high-position relay 200. In other words, when the driver wants to operate the PTC high-position relay 200, the three-position rotary switch 310 must be set to position 3 (high position). When the three-position rotary switch 310 is operating in positions 1-2, the PTC high-position relay 200 defaults to low-position operation regardless of whether it is in a low or high position, thus effectively preventing damage to the evaporator fan, speed control resistor, and main air outlet of the cab due to misoperation.

[0060] Among them, as shown in the attached figure Figure 1-2 As shown, a cable is led out from the high position (H) of the three-position rotary switch 310 to the three-position relay 100 (pin 85) of the evaporator fan, and another cable is led out from the high position (H) of the three-position rotary switch 310 to the high position relay 200 (pin 85) of the PTC.

[0061] When the low (L, i.e., position 1, the same below) and medium (M, i.e., position 2, the same below) positions of the three-position rotary switch 310 are turned on, the high (H, i.e., position 3, the same below) position of the three-position rotary switch 310 has no output signal. In addition, the PTC high-position relay 200 defaults to low-position operation, so regardless of the current position of the three-position rotary switch 310, the PTC high-position relay 200 will operate in low-position or high-position operation. Only when the high (H) position of the three-position rotary switch 310 has an output (the three-position rotary switch 310 is turned to high-position (H)), the PTC high-position relay 200 can operate in either low-position or high-position operation depending on the low or high position output signal of the two-position rotary switch 320.

[0062] The purpose of adding a first freewheeling diode 110 between pin 85 and pin 86 of the three-position relay of the evaporator fan is to prevent the high voltage or large current that may be mistakenly output by the speed regulating resistor 330 when the three-position rotary switch 310 is running in position 1-2, so as to prevent the limit control adapter harness from failing.

[0063] A second freewheeling diode 321 is added between the first and second output terminals of the two-position rotary switch 320 to prevent the first and second output terminals of the two-position rotary switch 320 from erroneously outputting high voltage or high current, which could cause the limit control adapter harness to fail.

[0064] It is worth mentioning that the specific selection and connection method of the cable in this embodiment are detailed in Tables 1-2 of the appendix.

[0065] It is worth mentioning that the specific selection of speed regulating resistors and other technical features involved in this utility model patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be conventionally selected in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not elaborate further.

[0066] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0067] Appendix

[0068] Table 1

[0069]

[0070] Table 2

[0071]

Claims

1. A limit control adapter harness, one end of which is electrically connected to a control panel, and the other end of which is electrically connected to an evaporator harness, characterized in that: The limit control adapter harness includes the evaporator fan three-speed relay, PTC high-end relay and the first freewheeling diode, among which: The control panel includes a three-speed rotary switch, the high speed of the three-speed rotary switch is connected to the three-speed relay of the evaporator fan through a cable, and the high speed of the three-speed rotary switch is connected to the high speed relay of the PTC through a cable; The control panel includes a two-speed rotary switch, and the first output end of the two-speed rotary switch is connected to the PTC high-end relay through a cable; The positive pole of the first freewheeling diode is electrically connected to the third-speed relay of the evaporator fan, and the negative pole of the first freewheeling diode is electrically connected to the third-speed relay of the evaporator fan.

2. The limit control adapter harness according to claim 1, characterized in that: The control panel also includes a temperature controller, which includes a potentiometer, an integrated block and a relay coil. The input end of the integrated block is electrically connected to the potentiometer, and the output end of the integrated block is electrically connected to the relay coil.

3. The limit control adapter harness according to claim 1, characterized in that: A second freewheeling diode is connected between the first output end and the second output end of the two-speed knob switch, the anode of the second freewheeling diode is electrically connected to the first output end of the two-speed knob switch, and the cathode of the second freewheeling diode is electrically connected to the second output end of the two-speed knob switch.

4. The limit control adapter harness according to claim 1, characterized in that: The low gear of the three-gear rotary switch is electrically connected to the evaporator wiring harness through a cable, and the middle gear of the three-gear rotary switch is electrically connected to the evaporator wiring harness through a cable.

5. The limit control adapter harness according to claim 2, characterized in that: The relay coil is electrically connected to the evaporator wiring harness through a cable, the potentiometer is electrically connected to the evaporator wiring harness through a cable, and the input end of the integrated block is electrically connected to the evaporator wiring harness through a cable.

6. A limit control adapter harness, the limit control adapter harness is located in the cab, one end of the limit control adapter harness is electrically connected to the control panel, and the other end of the limit control adapter harness is electrically connected to the evaporator harness, characterized in that: The limit control adapter harness includes the evaporator fan three-speed relay, PTC high-end relay and the first freewheeling diode, among which: The control panel includes a three-speed rotary switch, the high speed of the three-speed rotary switch is connected to the three-speed relay of the evaporator fan through a cable, and the high speed of the three-speed rotary switch is connected to the high speed relay of the PTC through a cable; The control panel includes a two-speed rotary switch, and the first output end of the two-speed rotary switch is connected to the PTC high-end relay through a cable; The positive pole of the first freewheeling diode is electrically connected to the third-speed relay of the evaporator fan, and the negative pole of the first freewheeling diode is electrically connected to the third-speed relay of the evaporator fan.

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