Dual compressor control system for vehicle air conditioner

Abstract

The application discloses a kind of double-compressor control system for vehicle air conditioner, the main design concept of the application is, additional multiple increase a set of compressor and temperature controller, and by the controller that independently sets, comprehensive ambient temperature and compressor cylinder temperature, the working state of two compressors is decided, specifically, controller utilizes the level state of three groups of input signals received by logic operation to the corresponding level signal of two-way switch output, to reasonably allocate the working mode of two sets of compressors, so that compressor is kept in optimum working state and guarantees the comfort of vehicle.This application can provide sufficient cooling time for two sets of compressors under specific working conditions based on the input temperature signal, so as to significantly improve the output of useful work, and effectively improve the working efficiency of vehicle air conditioning system.

Description

Technical Field

[0001] This invention relates to the field of vehicle air conditioning technology, and in particular to a dual-compressor control system for vehicle air conditioning. Background Technology

[0002] When the power switch, windshield switch, and AC switch of a car's air conditioning system are all turned on, the condenser fan and compressor will work. Refrigerant (such as R134a) circulates through the evaporator core in the air box, and the low-temperature liquid refrigerant formed by the compressor, condenser, and expansion valve absorbs heat from the surrounding air to achieve cooling. However, prolonged operation of the air conditioning compressor can cause the cylinder block to heat up, leading to decreased efficiency of the vehicle's air conditioning system and increased fuel consumption.

[0003] Specifically, existing air conditioning control circuits, such as Figure 1 As shown, it mainly consists of a power control circuit, a blower control circuit, an electromagnetic clutch control circuit, and a temperature control circuit. The power control circuit controls the current of the electromagnetic clutches for the blower and compressor. The general flow is: battery → ignition switch → relay fuse → air conditioning relay electromagnetic coil → blower fan speed switch → ground. The air conditioning relay can only be activated when the ignition switch and fan speed switch are on. The blower control circuit controls the blower speed to control the airflow. The general flow is: battery → fuse → air conditioning relay → blower OFF position. The air conditioning relay is open, causing the blower to stop due to lack of power. L+ position: blower → R → R → R → ground, maximum resistance, minimum airflow; ML position: blower → R → R → ground, moderate resistance, moderate airflow; MH position: blower → R → ground, moderate resistance, moderate airflow; H position: blower → ground, minimum resistance, maximum airflow. The electromagnetic clutch control circuit controls the engagement and disengagement of the electromagnetic clutch to control the operation and shutdown of the compressor. The general process is: battery → fuse → air conditioning relay → pressure switch → electromagnetic clutch → ground. The compressor can only work when the air conditioning relay and pressure switch are both connected.

[0004] This traditional vehicle air conditioning control circuit will significantly reduce the useful power of the air conditioning compressor after it has been running for a long time, resulting in a sharp increase in energy consumption. Summary of the Invention

[0005] In view of the above, the present invention aims to provide a dual compressor control system for vehicle air conditioning to solve the aforementioned technical problems.

[0006] The technical solution adopted in this invention is as follows:

[0007] The present invention provides a dual compressor control system for vehicle air conditioning, comprising: an independent controller, a redundant compressor, a redundant thermostat, a first switch, and a second switch;

[0008] The input end of the controller is connected with an ambient temperature signal, an original compressor cylinder temperature signal and a redundant compressor cylinder temperature signal respectively;

[0009] The output end of the controller is connected with a first switch and a second switch respectively, and the output signal of an AC switch of a vehicle-mounted air conditioner is connected with the first switch and the second switch respectively.

[0010] The controller is used for comprehensively controlling the ambient temperature and the cylinder temperature of the two compressors to control the working mode of the redundant compressor and the original compressor.

[0011] In at least one possible implementation, the first switch and the second switch are both NPN type triodes, the output end of the controller is connected with the base of the two triodes respectively, and the output signal of the AC switch is connected with the collector of the two triodes respectively.

[0012] The emitter of the two triodes is connected with the original compressor and the original temperature controller, and the redundant compressor and the redundant temperature controller respectively.

[0013] In at least one possible implementation, the working mode includes that only one of the two compressors works, the two compressors work simultaneously or the two compressors are both stopped.

[0014] In at least one possible implementation, the ambient temperature signal, the original cylinder temperature signal and the redundant cylinder temperature signal are connected with the input end of the controller by two input levels respectively.

[0015] In at least one possible implementation, based on the relationship between the ambient temperature signal and the preset first ambient temperature threshold and the second ambient temperature threshold, the two input levels of the ambient temperature signal have different input combination states.

[0016] Based on the relationship between the original cylinder temperature signal and the preset first original cylinder temperature threshold and the second original cylinder temperature threshold, the two input levels of the original cylinder temperature signal have different input combination states.

[0017] Based on the relationship between the redundant cylinder temperature signal and the preset first redundant cylinder temperature threshold and the second redundant cylinder temperature threshold, the two input levels of the redundant cylinder temperature signal have different input combination states.

[0018] In at least one of the possible implementation manners, the first redundancy cylinder temperature threshold is the same as the first original machine cylinder temperature threshold, and / or the second redundancy cylinder temperature threshold is the same as the second original machine cylinder temperature threshold.

[0019] In at least one of the possible implementation manners, the outputs of the original machine temperature controller and the redundancy temperature controller are respectively connected with a pressure switch of the vehicle-mounted air conditioner.

[0020] The main design concept of the present application is that an additional set of compressor and temperature controller is added, and the controller comprehensively decides the working state of the two compressors according to the ambient temperature and the cylinder temperature of the compressor, specifically, the controller outputs corresponding level signals to the two-way switch through logical operation of the received three groups of input signals, so as to reasonably distribute the working mode of the two sets of compressors, so that the compressor can be kept in the best working state and the comfort of the vehicle is ensured. Based on the input temperature signal, the present application can provide sufficient cooling time for each set of compressor in a specific working condition, so as to significantly improve the output of useful work, and thus effectively improve the working efficiency of the vehicle-mounted air conditioning system. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described below in combination with the drawings, in which:

[0022] Figure 1 It is a schematic diagram of the existing vehicle-mounted air conditioner control circuit;

[0023] Figure 2 It is an electrical schematic diagram of the double-compressor control system for vehicle-mounted air conditioner provided by the embodiment of the present application. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be interpreted as a limitation on the present application.

[0025] The present application proposes an embodiment of a double-compressor control system for vehicle-mounted air conditioner, specifically as shown in Figure 2 which includes an independent controller 100 (such as MCU), a redundancy compressor 20 and a redundancy temperature controller 21.

[0026] The input end of the controller 100 is respectively connected with an ambient temperature signal, an original machine cylinder temperature signal of the original machine compressor 10 and a redundancy cylinder temperature signal of the redundancy compressor 20;

[0027] The output of the controller 100 is connected to the first switch 31 and the second switch 32 respectively, and the output signal of the AC switch of the vehicle air conditioner is connected to the first switch 31 and the second switch 32 respectively, and the first switch 31 is connected to the original compressor 10 and the original temperature controller 11 respectively, and the second switch 32 is connected to the redundant compressor 20 and the redundant temperature controller 21 respectively; it can be understood that in some embodiments, the output of the original temperature controller 11 and the redundant temperature controller 21 is connected to the pressure switch of the vehicle air conditioner.

[0028] The controller 100 is used to comprehensively control the ambient temperature and the cylinder temperature of the two compressors, and control the working mode of the redundant compressor and the original compressor, and the working mode includes only one of the compressors working or both of the compressors working or both of the compressors stopping working.

[0029] In actual operation, the working mode has four states in total: the output control level U1=1, U2=1 of the controller, which can trigger both of the compressors to work; the output control level U1=1, U2=0, which can trigger the original compressor to work and the redundant compressor to stop working; the output control level U1=0, U2=1, which can trigger the original compressor to stop working and the redundant compressor to work; and the output control level U1=0, U2=0, which can trigger both of the compressors to stop working. Based on this concept, the first switch and the second switch can be realized by NPN type transistors Q1 and Q2, specifically, the output of the controller 100 is connected to the base of the two transistors respectively, the output signal of the AC switch is connected to the collector of the two transistors respectively, and the emitter of the two transistors is connected to the original compressor 10 and the original temperature controller 11, and the redundant compressor 20 and the redundant temperature controller 21 respectively. In this way, when U1 is high, the corresponding transistor Q1 is turned on, and the original compressor works; when U2 is low, the transistor Q1 is turned off, and the original compressor does not work. When U2 is high, the corresponding transistor Q2 is turned on, and the redundant compressor works; when U2 is low, the transistor Q2 is turned off, and the redundant compressor does not work.

[0030] And for the state mode of triggering the output U1 and U2 of the controller, the three input signals mentioned above can be further designed to have different level input states, that is, each input signal contains two input states. Specifically, the ambient temperature signal, the original cylinder temperature signal and the redundant cylinder temperature signal are respectively connected to the controller by two level signals.

[0031] For example, X1 and X2 can be set as two input levels of the ambient temperature signal, and further, based on the relationship between the current ambient temperature and the preset first ambient temperature threshold and second ambient temperature threshold, the two input levels have three input states, for example:

[0032] Current ambient temperature > first ambient temperature threshold (e.g. 30°C): X1 = 1, X2 = 0;

[0033] Second ambient temperature threshold (e.g. 20°C) < current ambient temperature < first ambient temperature threshold (e.g. 30°C): X1 = 0, X2 = 1;

[0034] Current ambient temperature < second ambient temperature threshold (e.g. 20°C): X1 = 0, X2 = 0.

[0035] Similarly, Y1 and Y2 can be set as two input levels of the original engine cylinder temperature signal, and further, based on the relationship between the original engine cylinder temperature and the preset first original engine cylinder temperature threshold and second original engine cylinder temperature threshold, the two input levels have three input states, for example:

[0036] Original engine cylinder temperature > first original engine cylinder temperature threshold (e.g. 80°C): Y1 = 1, Y2 = 0;

[0037] Second original engine cylinder temperature threshold (e.g. 60°C) < original engine cylinder temperature < first original engine cylinder temperature threshold (e.g. 80°C): Y1 = 0, Y2 = 1;

[0038] Original engine cylinder temperature < second original engine cylinder temperature threshold (e.g. 60°C): Y1 = 0, Y2 = 0.

[0039] Similarly, Z1 and Z2 can be set as two input levels of the redundant cylinder temperature signal, and further, based on the relationship between the redundant cylinder temperature and the preset first redundant cylinder temperature threshold and second redundant cylinder temperature threshold, the two input levels have three input states, for example:

[0040] Redundant cylinder temperature > first redundant cylinder temperature threshold (e.g. 80°C): Z1 = 1, Z2 = 0;

[0041] Second redundant cylinder temperature threshold (e.g. 60°C) < redundant cylinder temperature < first redundant cylinder temperature threshold (e.g. 80°C): Z1 = 0, Z2 = 1;

[0042] Redundant cylinder temperature < second redundant cylinder temperature threshold (e.g. 60°C): Z1 = 0, Z2 = 0.

[0043] It is appreciated that in the preferred embodiment, the redundant compressor of the same specification as the original compressor can be selected, and according to the concept, the first redundant cylinder temperature threshold can be the same as the first original cylinder temperature threshold, and the second redundant cylinder temperature threshold can be the same as the second original cylinder temperature threshold.

[0044] It is known from the foregoing examples that, since the three input signals each have three states of the two input levels, a plurality of input conditions relative to the controller can be formed by permutation and combination, and therefore the controller can be designed to have a corresponding logic of input and output, so as to have a specific output mode for each input condition. For example, if the input is X1=1, X2=0, Y1=0, Y2=0, Z1=1, Z2=0, the output is U1=1, U2=0; if the input is X1=0, X2=1, Y1=0, Y2=0, Z1=0, Z2=0, the output is U1=1, U2=1; if the input is X1=0, X2=0, Y1=0, Y2=1, Z1=0, Z2=0, the output is U1=0, U2=1, and so on. Here, the logic operation design can be performed as required.

[0045] In summary, the main design concept of the present application is to additionally increase a set of compressors and temperature controllers, and to comprehensively determine the working states of the two compressors by using the ambient temperature and the cylinder temperature of the compressors received by the independently arranged controller. Specifically, the controller outputs corresponding level signals to the two-way switch through logic operation of the level states of the three groups of input signals, so as to reasonably distribute the working modes of the two sets of compressors, so that the compressors can be kept in the best working state and the comfort of the vehicle is ensured. Based on the input temperature signal, the present application can provide sufficient cooling time for each of the two sets of compressors in a specific working condition, so as to significantly improve the output of useful work, and thus effectively improve the working efficiency of the vehicle-mounted air conditioning body.

[0046] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can mean: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, and c can be single or multiple.

[0047] The above detailed description of the embodiments shown in the drawings illustrates the structure, features and effects of the present application, but the above is only a preferred embodiment of the present application, and it should be noted that the technical features involved in the above embodiments and preferred modes can be reasonably combined and matched into various equivalent schemes by those skilled in the art without departing from or changing the design idea and technical effects of the present application; therefore, the present application is not limited to the implementation range shown in the drawings, and any changes or modifications made in accordance with the concept of the present application, or equivalent embodiments with equivalent changes, shall be within the scope of protection of the present application.

Claims

1. A dual-compressor control system for vehicle air conditioning, characterized in that, include: Independent controller, redundant compressor, redundant temperature controller, first switch and second switch; The input terminals of the controller are respectively connected to the ambient temperature signal, the original cylinder block temperature signal of the original compressor, and the redundant cylinder block temperature signal of the redundant compressor. The output terminals of the controller are connected to the first switch and the second switch respectively. The output signal of the AC switch of the vehicle air conditioner is connected to the first switch and the second switch respectively. The first switch is connected to the original compressor and the original thermostat respectively, and the second switch is connected to the redundant compressor and the redundant thermostat respectively. The controller is used to control the operating modes of the redundant compressor and the original compressor by considering both the ambient temperature and the cylinder temperatures of the two compressors. Specifically, it includes: The ambient temperature signal, the original cylinder block temperature signal, and the redundant cylinder block temperature signal are each connected to the input terminal of the controller via two input levels. Based on the relationship between the ambient temperature signal and the preset first and second ambient temperature thresholds, the two input levels of the ambient temperature signal have three input combination states. Based on the relationship between the original engine cylinder block temperature signal and the preset first original engine cylinder block temperature threshold and second original engine cylinder block temperature threshold, the two input levels of the original engine cylinder block temperature signal have three input combination states. Based on the relationship between the redundant cylinder temperature signal and the preset first redundant cylinder temperature threshold and second redundant cylinder temperature threshold, the two input levels of the redundant cylinder temperature signal have three input combination states. The three input signals, each with three states, are arranged and combined to form several input situations relative to the controller. Based on these input situations, the controller presets the corresponding logic between the first switch and the second switch, so that each input situation has a corresponding operating mode for the control redundant compressor and the original compressor.

2. The dual-compressor control system for vehicle air conditioning according to claim 1, characterized in that, Both the first switch and the second switch are NPN transistors. The output terminal of the controller is connected to the base of the two transistors respectively, and the output signal of the AC switch is connected to the collector of the two transistors respectively. Furthermore, the emitters of the two transistors are respectively connected to the original compressor and the original temperature controller, as well as the redundant compressor and the redundant temperature controller.

3. The dual-compressor control system for vehicle air conditioning according to claim 1, characterized in that, The operating modes include: only one compressor is working, both compressors are working simultaneously, or both compressors are shut down.

4. The dual-compressor control system for vehicle air conditioning according to claim 1, characterized in that, The first redundant cylinder block temperature threshold is the same as the first original cylinder block temperature threshold, and / or the second redundant cylinder block temperature threshold is the same as the second original cylinder block temperature threshold.

5. The dual-compressor control system for vehicle air conditioning according to any one of claims 1 to 4, characterized in that, The output terminals of the original thermostat and the redundant thermostat are respectively connected to the pressure switch of the vehicle air conditioner.

Images