Air conditioner heating control system, control method and engineering machinery equipment

Abstract

The application discloses an air conditioner heating control system and method and engineering mechanical equipment, and belongs to the technical field of engineering mechanical equipment. The system comprises a cooling liquid circulating unit, a power supply unit and a control unit. The cooling liquid circulating unit comprises a water tank, a warm air radiator, a heating circulating water pump and a water heater. The control unit is sequentially connected with an instrument control switch, an air conditioner controller, a whole vehicle controller, a multi-in-one controller and a main electromagnetic relay. The main electromagnetic relay is provided with four ports, the first port and the second port are kept in constant closed communication on the first loop. The main electromagnetic relay is provided with an action current, and a control switch is arranged between the third port and the fourth port on the second loop. The main electromagnetic relay realizes the conduction or turn-off of the control switch between the third port and the fourth port according to the first working current. The working states of the heating circulating water pump and the water heater are synchronously associated, so that the system failure rate is effectively reduced.

Description

Technical Field

[0001] This invention relates to an air conditioning heating control system, control method, and engineering machinery equipment, belonging to the technical field of engineering machinery equipment. Background Technology

[0002] An air conditioning heating system is based on a traditional heating system. It changes the heating source from the residual heat of the engine coolant to the water heater (WPTC) that heats the coolant, and adds a heating circulating water pump to coordinate the circulation and heating of the coolant throughout the entire air conditioning heating system.

[0003] However, in the existing technology, the water heater and the heating circulating water pump operate independently after being powered by their respective power supply lines, resulting in poor correlation. If a series of faults occur in the relevant components of the heating circulation system, the water pump will stop running, and the circulation of the cooling liquid in the heating system will stop. Conversely, the water heater outside the independent system will continue to work. The large amount of heat generated by continuous operation will accumulate in the water heater, which can easily cause high temperature faults and damage to components. Summary of the Invention

[0004] The purpose of this invention is to provide an air conditioning heating control system, control method, and engineering machinery equipment, which aims to enable the water heater to respond synchronously in real time to a series of faults in the water pump, thereby effectively reducing the overall failure rate of the system.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution: On one hand, the present invention provides an air conditioning heating control system, which includes a coolant circulation unit, a power supply unit and a control unit; the coolant circulation unit includes a water tank, a heater radiator, a heating circulating water pump and a water heater; the power supply unit includes a power battery and a battery management module; the control unit is electrically connected in sequence to an instrument control switch, an air conditioning controller and a vehicle controller, characterized in that the control unit also includes a multi-in-one controller and a main electromagnetic relay; The all-in-one controller includes a first electromagnetic relay, a second electromagnetic relay, and a transformer, and the signal output terminal of the vehicle controller is connected to the input terminals of the first electromagnetic relay and the second electromagnetic relay, respectively. The input terminal of the first electromagnetic relay is also connected to the battery management module through the transformer, and its output terminal outputs a first operating current through the transformer to reduce the current. The input terminal of the second electromagnetic relay is also connected to the battery management module, and its output terminal outputs a second operating current. The main electromagnetic relay includes a first port and a second port that connect the first circuit, and a third port and a fourth port that connect the second circuit, and a control switch is provided between the third port and the fourth port; The main electromagnetic relay is equipped with an operating current. The main electromagnetic relay realizes the conduction or cutoff of the control switch between the third port and the fourth port according to the first operating current flowing through the first circuit.

[0006] This invention employs a related electromagnetic relay to innovatively link the two independent circuits of the heating circulating water pump and the water heater in the prior art. By comparing the working current at the output of the multi-in-one controller with the operating current (i.e., the pull-in current) inside the main electromagnetic relay, the control switch inside the main electromagnetic relay is turned on or off, thereby correspondingly turning on or off the circuit where the water heater is located. This ensures that the water heater can synchronously and in real time continue heating or stop operating in a timely manner according to the current flowing through the water pump.

[0007] Optionally, the main electromagnetic relay activates or deactivates the control switch between the third and fourth ports based on the first operating current flowing through the first circuit, including: When the first operating current is greater than the operating current provided in the main electromagnetic relay, the control switch is activated, and the corresponding second circuit is connected. The first operating current flows through the first port and the second port to the heating circulating water pump, driving the heating circulating water pump to circulate the coolant; The second operating current flows through the third and fourth ports to the water heater, driving the water heater to heat the coolant.

[0008] In an electromagnetic relay, in order to activate the relay and close its contacts, the current through the relay coil needs to be increased. The minimum current required for the relay to operate is called the operating current. If the current through the relay coil is greater than the operating current, the main circuit of the electromagnetic relay is connected, and the water heater can operate synchronously with the water pump.

[0009] Optionally, it also includes an alarm unit, and the signal output terminal of the heating circulating water pump is connected to a first controller, and the signal output terminal of the water heater is connected to a second controller; The control terminal of the alarm unit is connected to the first controller and the second controller respectively.

[0010] The design of the alarm unit ensures the real-time output of fault commands and the timely handling of related faults, while ensuring that the water heater reacts synchronously.

[0011] Optionally, the main electromagnetic relay, based on the first operating current flowing through the first circuit, enables the control switch between the third and fourth ports to engage or disengage, further includes: When the first operating current is less than the operating current provided in the main electromagnetic relay, the control switch is turned off, and the corresponding second circuit is disconnected; the first operating current flows through the first port and the second port, and reaches the heating circulating water pump, driving the heating circulating water pump to circulate the coolant; The fourth port of the main electromagnetic relay has no operating current output, the coolant in the water heater is not heated, and the second controller also controls the alarm unit to output an alarm signal that the water heater is not heating.

[0012] Optionally, when the first operating current is the no-load current, there is no coolant circulating in the heating circulating water pump, and the first controller also controls the alarm unit to output a no-load alarm signal for the heating circulating water pump.

[0013] The operating current at the output of the all-in-one controller is less than the internal operating current of the main electromagnetic relay. The control switch inside the main electromagnetic relay will not be activated, and the circuit where the water heater is located will not be connected. This achieves correlation in fault conditions and avoids the drawback of the water heater continuing to burn dry due to water pump pipeline damage or coolant loss in independent operation.

[0014] Optionally, the main electromagnetic relay, based on the first operating current flowing through the first circuit, enables the control switch between the third and fourth ports to engage or disengage, further includes: When there is no operating current in the first circuit, the control switch is turned off, and the corresponding second circuit is disconnected; the coolant in the heating circulating water pump does not circulate, the coolant in the water heater does not heat, and the first controller and the second controller control the alarm unit to output an alarm signal indicating that the heating circulating water pump is not circulating and the water heater is not heating.

[0015] When no current flows through the control switch of the main electromagnetic relay, the corresponding second circuit of the main electromagnetic relay is not connected. That is, the power supply port of the water heater of the multi-function controller to the power supply line of the water heater is in an open circuit state, the water heater does not work and cannot heat the coolant. At this time, the coolant is in a state of non-circulation and non-heating.

[0016] Optionally, when the first operating current flows through the first port and the second port to the heating circulating water pump, there is no operating current in the second circuit; The coolant in the heating circulating water pump circulates, while the coolant in the water heater does not heat the water. The second controller controls the alarm unit to output a water heater fault alarm signal. When the air conditioning heating system initially starts working normally, the water heater stops working due to a fault. Although the heating process stops, the coolant circulation continues as normal.

[0017] On the other hand, the present invention also provides an air conditioning heating control method, which includes the following steps: Obtain the heating needs of the operating users; The instrument control switch sends a heating signal to the air conditioning controller; The air conditioning controller receives the heating signal and outputs the heating signal to the vehicle controller; The vehicle controller receives the heating signal and sends a power-on or power-off command to the heating circulating water pump and water heater to the multi-function controller. The power supply output terminal of the water heater and heating circulating water pump of the multi-function controller outputs voltage or no voltage output.

[0018] Furthermore, if the heating circulating water pump is working normally, the water heater will also be working normally; If the heating circulating water pump malfunctions, the water heater will stop heating, and the alarm unit will output an alarm signal indicating that the heating circulating water pump is not circulating and the water heater is not heating. If the cooling fluid in the heating circulating water pump is insufficient, the water heater will stop heating, and the alarm unit will output a no-load alarm signal for the heating circulating water pump. If the water heater malfunctions but the heating circulating water pump is working normally, the alarm unit will output a water heater malfunction alarm signal.

[0019] Thirdly, the present invention also provides an engineering machinery device, which includes the above-mentioned air conditioning and heating control system.

[0020] Other equipment in the field of construction machinery, such as excavators, cranes, and agricultural machinery, can also utilize the aforementioned air conditioning and heating control system. Based on the mutual cooperation of water heaters, heating circulating water pumps, related electromagnetic relays, and controllers, the overall failure rate of the system can be effectively reduced.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: (1) By innovatively introducing an electromagnetic relay as an intermediate component, this invention changes the separate circuit of the heating circulating water pump and the circuit of the water heater in the prior art, and cleverly links the two together. This ensures that when the heating circulating water pump experiences a series of failures, the water heater can respond synchronously in real time according to the status of the heating circulating water pump, so as to avoid damage to the water heater due to excessive temperature. This significantly reduces the overall failure rate of the heating system. (2) At the same time, the setting of the heating circulating water pump and water heater response controller also makes the source of the fault more accurately identified, so as to ensure the high efficiency of the air conditioning heating system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the air conditioning heating control system of the present invention. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0024] Example 1 This embodiment provides an air conditioning heating control system, which includes a coolant circulation unit, a power supply unit, and a control unit; the coolant circulation unit includes a water tank, a heater radiator, a heating circulating water pump, and a water heater; the power supply unit includes a power battery and a battery management module; the control unit is electrically connected in sequence to an instrument control switch, an air conditioning controller, and a vehicle controller, characterized in that the control unit also includes a multi-function controller and a main electromagnetic relay; The all-in-one controller includes a first electromagnetic relay, a second electromagnetic relay, and a transformer, and the signal output terminal of the vehicle controller is connected to the input terminals of the first electromagnetic relay and the second electromagnetic relay, respectively. The input terminal of the first electromagnetic relay is also connected to the battery management module through the transformer, and its output terminal outputs a first operating current through the transformer to reduce the current. The input terminal of the second electromagnetic relay is also connected to the battery management module, and its output terminal outputs a second operating current. The main electromagnetic relay includes a first port and a second port that connect the first circuit, and a third port and a fourth port that connect the second circuit, and a control switch is provided between the third port and the fourth port; The main electromagnetic relay is equipped with an operating current. The main electromagnetic relay realizes the conduction or cutoff of the control switch between the third port and the fourth port according to the first operating current flowing through the first circuit.

[0025] This invention proposes a control system that correlates the operating states of a water heater and a heating circulating water pump. By identifying the operating state of the heating circulating water pump, the system confirms whether the water heater is energized. In practical application, if the current flowing through the water pump is greater than the operating current of the main electromagnetic relay, the water heater operates synchronously with the water pump. If the water pump malfunctions or the current flowing through the water pump is less than the operating current of the main electromagnetic relay, the control switch on the circuit containing the water heater will not be activated, and the corresponding circuit will not be connected. This prevents the water heater from continuously burning dry in an independent circuit state, achieving a high degree of correlation between the heating circulating water pump and the water heater, and significantly reducing the probability of system failure.

[0026] Example 2 Based on Example 1, this example takes into account the actual working conditions of engineering machinery and equipment, and designs the air conditioning heating control logic, which is described in detail below.

[0027] I. Heating turned on When the operator needs heating, they can turn on the heating switch via the instrument panel in the cab. The air conditioning controller receives the heating turn-on signal and sends a heating signal to the vehicle controller. After receiving the heating signal, the vehicle controller sends a power-on command to the water heater and heating circulating water pump to the multi-function controller according to the set program. The power supply ports of the water heater and heating circulating water pump of the multi-function controller output voltage.

[0028] The specific heating control principles involved are as follows: The all-in-one controller draws power (DC high voltage) from the power battery through the battery management module (BMS). The high voltage is split into two paths at the input of the all-in-one controller, namely the first circuit and the second circuit. The current in the first circuit is reduced by a DC-DC converter and connected to the first electromagnetic relay. The current in the second circuit is directly output from the battery management module and input to the second electromagnetic relay. The first electromagnetic relay and the second electromagnetic relay are controlled by the instrument control switch signal, respectively, and control the current flow in the first circuit and the second circuit. When the instrument control switch is closed, the coils inside the first electromagnetic relay and the second electromagnetic relay are energized, and at this time both the first circuit and the second circuit are connected. When the instrument control switch is turned on, the first and second ports of the main electromagnetic relay are normally closed, maintaining the connection of the corresponding first circuit. The corresponding first operating current directly reaches the circulating water pump, driving the circulating water pump to work. Secondly, the third and fourth ports of the main electromagnetic relay are normally open. When operating current flows through the first and second ports of the main electromagnetic relay and this operating current is greater than the operating current set in the main electromagnetic relay, the control switch in the main electromagnetic relay is activated, thus connecting the circuit between the third and fourth ports. The second current in the second circuit then passes through the main electromagnetic relay and reaches the WPTC, thereby driving the WPTC to heat the coolant.

[0029] II. After the heating system is turned on, the following situations may occur depending on the actual operating conditions: (1) The water pump is working normally In an electromagnetic relay, in order to activate the relay and close its contacts, the current through the relay coil needs to be increased. The minimum current required for the relay to operate is called the operating current. If the current through the relay coil is greater than the operating current, the main circuit of the electromagnetic relay is connected, and the water heater can operate synchronously with the water pump.

[0030] Specifically, if the heating circulating water pump is working normally, the first operating current flows through the first port and the second port to the heating circulating water pump, driving the heating circulating water pump to circulate the coolant. Simultaneously, since the first operating current is greater than the operating current provided in the main electromagnetic relay, the control switch is activated, and the corresponding second circuit is connected. The second operating current flows through the third and fourth ports to the water heater, driving the water heater to heat the coolant.

[0031] The coolant is in a circulating and heated state.

[0032] It is worth noting that, in order to further ensure the real-time output of fault commands and the timely handling of related faults, while ensuring that the water heater responds synchronously, the air conditioning and heating control system is also equipped with an alarm unit. The signal output terminal of the heating circulating water pump is connected to a first controller, and the signal output terminal of the water heater is connected to a second controller. The control terminal of the alarm unit is connected to the first controller and the second controller respectively.

[0033] (2) The water pump is running dry (due to pipe damage or lack of coolant). The operating current at the output of the multi-function controller is less than the internal operating current of the main electromagnetic relay. Therefore, the control switch between the third and fourth ports of the main electromagnetic relay will not be activated, and the second circuit where the corresponding water heater is located will not be connected. This achieves high correlation in fault conditions and avoids the drawback of the water heater continuing to burn dry due to water pump pipeline damage or coolant loss in independent operation.

[0034] Specifically, when the first operating current output by the all-in-one controller is less than the operating current provided in the main electromagnetic relay, the control switch in the main electromagnetic relay will not be activated and will be in the off state, and the corresponding second circuit will not be connected as a result. At this time, the first operating current flows through the first port and the second port, and reaches the heating circulating water pump as usual, driving the heating circulating water pump to circulate the coolant; The fourth port of the main electromagnetic relay has no working current output due to the control switch being turned off, so the coolant in the water heater is not heated, and the second controller also controls the alarm unit to output an alarm signal that the water heater is not heating.

[0035] The coolant is in a circulating state but not heated.

[0036] In addition, when the water pump pipe of the air conditioning heating system is damaged or the coolant is missing, the heating circulating water pump will run without load, and the no-load current will be the no-load current. This no-load current is less than the operating current inside the main electromagnetic relay. The control switch inside the main electromagnetic relay will not be activated, that is, the corresponding second circuit will not be connected. The water heater will not work due to the power supply line being disconnected, thus avoiding the risk of dry burning of the water heater due to the lack of coolant. The coolant is in a state of non-circulation and non-heating.

[0037] (3) Water pump failure When the water pump malfunctions, there is no operating current in the first circuit, the control switch changes from the engaged state to the off state, and the corresponding second circuit is disconnected; the coolant in the heating circulating water pump does not circulate, the coolant in the water heater does not heat, and the first controller and the second controller control the alarm unit to output an alarm signal indicating that the heating circulating water pump is not circulating and the water heater is not heating.

[0038] When no current flows through the control switch of the main electromagnetic relay, the second circuit of the main electromagnetic relay is not connected. That is, the power supply port of the water heater of the multi-function controller to the power supply line of the water heater is in an open circuit state. The water heater does not work and cannot heat the coolant. At this time, the coolant is in a state of non-circulation and non-heating.

[0039] The coolant is in a state of non-circulation and non-heating.

[0040] (4) Water heater malfunction The air conditioning heating system was just starting to work normally when the water heater stopped working due to a malfunction. Although the heating process stopped, the coolant circulation process continued as usual.

[0041] Specifically, when the first operating current flows through the first port and the second port, it reaches the heating circulating water pump; there is no operating current in the second circuit; The coolant in the heating circulating water pump is circulated, the coolant in the water heater is not heated, and the second controller controls the alarm unit to output a water heater fault alarm signal. The coolant is in a circulating state but not heated.

[0042] III. Heating Shutdown After the heating system is working normally, if the user intends to cancel the heating requirement, they can turn off the heating switch option through the instrument panel in the driver's cab. The air conditioning controller receives the heating off signal and sends a signal to the vehicle controller. After receiving the heating off signal, the vehicle controller sends a power-off command to the multi-function controller to cancel the power on of the water heater and heating circulating water pump according to the set program. The power supply ports of the multi-function controller for the water heater and heating circulating water pump have no voltage output, and neither the water heater nor the heating circulating water pump works.

[0043] This embodiment adds a main electromagnetic relay between the all-in-one controller and the water heater power supply line. The power supply current of the heating circulating water pump passes through one circuit of this main electromagnetic relay, and the power supply line of the water heater passes through the other circuit of the same main electromagnetic relay. The two circuits are interconnected within the main electromagnetic relay. Based on the control principle of the electromagnetic relay, the on / off state of the water heater power supply line is synchronously controlled by the on / off state of the heating circulating water pump. This ensures that if the heating circulating water pump stops due to a malfunction or if the cooling fluid in the heating circulation system is insufficient, the water heater can stop synchronously and promptly, preventing component damage caused by overheating of the water heater and effectively reducing the overall system failure rate.

[0044] Example 3 This embodiment provides an engineering machinery equipment, which includes the above-mentioned air conditioning and heating control system.

[0045] Other equipment in the field of construction machinery, such as excavators, cranes, and agricultural machinery, can also utilize the aforementioned air conditioning and heating control system. Based on the mutual cooperation of water heaters, heating circulating water pumps, electromagnetic relays, and related controllers, the overall failure rate of the system can be effectively reduced.

[0046] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this disclosure / application, unless otherwise stated, "a plurality of" means two or more; It should also be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure / application based on the specific circumstances.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An air conditioning heating control system, comprising a coolant circulation unit, a power supply unit, and a control unit; the coolant circulation unit comprising a water tank, a heater radiator, a heating circulating water pump, and a water heater; the power supply unit comprising a power battery and a battery management module; the control unit being electrically connected in sequence to an instrument control switch, an air conditioning controller, and a vehicle controller, characterized in that, The control unit also includes an all-in-one controller and a main electromagnetic relay; The all-in-one controller includes a first electromagnetic relay, a second electromagnetic relay, and a transformer, and the signal output terminal of the vehicle controller is connected to the input terminals of the first electromagnetic relay and the second electromagnetic relay, respectively. The input terminal of the first electromagnetic relay is also connected to the battery management module through the transformer, and its output terminal outputs a first operating current through the transformer to reduce the current. The input terminal of the second electromagnetic relay is also connected to the battery management module, and its output terminal outputs a second operating current. The main electromagnetic relay includes a first port and a second port that connect the first circuit, and a third port and a fourth port that connect the second circuit, and a control switch is provided between the third port and the fourth port; The main electromagnetic relay is equipped with an operating current, and the main electromagnetic relay realizes the activation or deactivation of the control switch between the third port and the fourth port according to the first operating current flowing through the first circuit. The main electromagnetic relay activates or deactivates the control switch between the third and fourth ports based on the first operating current flowing through the first circuit, including: When the first operating current is greater than the operating current provided in the main electromagnetic relay, the control switch is activated, and the corresponding second circuit is connected. The first operating current flows through the first port and the second port to the heating circulating water pump, driving the heating circulating water pump to circulate the coolant; The second operating current flows through the third and fourth ports to the water heater, driving the water heater to heat the coolant.

2. The air conditioning heating control system according to claim 1, characterized in that, It also includes an alarm unit, and the signal output terminal of the heating circulating water pump is connected to a first controller, and the signal output terminal of the water heater is connected to a second controller; The control terminal of the alarm unit is connected to the first controller and the second controller respectively.

3. The air conditioning heating control system according to claim 2, characterized in that, The main electromagnetic relay activates or deactivates the control switch between the third and fourth ports based on the first operating current flowing through the first circuit, and further includes: When the first operating current is less than the operating current provided in the main electromagnetic relay, the control switch is turned off, and the corresponding second circuit is disconnected; the first operating current flows through the first port and the second port, and reaches the heating circulating water pump, driving the heating circulating water pump to circulate the coolant; The fourth port of the main electromagnetic relay has no operating current output, the coolant in the water heater is not heated, and the second controller also controls the alarm unit to output an alarm signal that the water heater is not heating.

4. The air conditioning heating control system according to claim 3, characterized in that, When the first operating current is the no-load current, there is no coolant circulating in the heating circulating water pump, and the first controller also controls the alarm unit to output a no-load alarm signal for the heating circulating water pump.

5. The air conditioning heating control system according to claim 2, characterized in that, The main electromagnetic relay activates or deactivates the control switch between the third and fourth ports based on the first operating current flowing through the first circuit, and further includes: When there is no operating current in the first circuit, the control switch is turned off, and the corresponding second circuit is disconnected; the coolant in the heating circulating water pump does not circulate, the coolant in the water heater does not heat, and the first controller and the second controller control the alarm unit to output an alarm signal indicating that the heating circulating water pump is not circulating and the water heater is not heating.

6. The air conditioning heating control system according to claim 2, characterized in that, When the first operating current flows through the first port and the second port, it reaches the heating circulating water pump; there is no operating current in the second circuit; The coolant in the heating circulating water pump is circulated, the coolant in the water heater is not heated, and the second controller controls the alarm unit to output a water heater fault alarm signal.

7. An air conditioning heating control method, applied to the air conditioning heating control system as described in any one of claims 1-6, characterized in that, Includes the following steps: Obtain the heating needs of the operating users; The instrument control switch sends a heating signal to the air conditioning controller; The air conditioning controller receives the heating signal and outputs the heating signal to the vehicle controller; The vehicle controller receives the heating signal and sends a power-on or power-off command to the heating circulating water pump and water heater to the multi-function controller. The power supply output terminal of the water heater and heating circulating water pump of the multi-function controller outputs voltage or no voltage output.

8. The air conditioning heating control method according to claim 7, characterized in that, The heating circulating water pump is working normally, and the water heater is also working normally; If the heating circulating water pump malfunctions, the water heater will stop heating, and the alarm unit will output an alarm signal indicating that the heating circulating water pump is not circulating and the water heater is not heating. If the cooling fluid in the heating circulating water pump is insufficient, the water heater will stop heating, and the alarm unit will output a no-load alarm signal for the heating circulating water pump. If the water heater malfunctions while the heating circulating water pump is working normally, the alarm unit will output a water heater malfunction alarm signal.

9. An engineering machinery equipment, characterized in that, Including the air conditioning and heating control system as described in any one of claims 1-6.

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