CN113212096B - Power-on control method of vehicle air conditioner, vehicle and computer-readable storage medium - Google Patents

Power-on control method of vehicle air conditioner, vehicle and computer-readable storage medium Download PDF

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CN113212096B
CN113212096B CN202010053342.5A CN202010053342A CN113212096B CN 113212096 B CN113212096 B CN 113212096B CN 202010053342 A CN202010053342 A CN 202010053342A CN 113212096 B CN113212096 B CN 113212096B
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charging
air conditioner
voltage
vehicle
time
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CN113212096A (en
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宋�莹
彭硕
王成
覃欢平
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BYD Co Ltd
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BYD Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00421—Driving arrangements for parts of a vehicle air-conditioning
    • B60H1/00428—Driving arrangements for parts of a vehicle air-conditioning electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00978—Control systems or circuits characterised by failure of detection or safety means; Diagnostic methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses

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Abstract

The invention discloses a power-on control method of a vehicle air conditioner, a vehicle and a computer readable storage medium, wherein the power-on control method comprises the following steps: the vehicle control unit sends a pre-charging control command to the air conditioner controller; the air conditioner controller executes a pre-charging program according to the pre-charging control instruction; when the air conditioner controller executes a pre-charging program, the pre-stage bus voltage and the pre-charging resistor rear-stage voltage are obtained, the pre-charging time is calculated according to the pre-stage bus voltage and the pre-charging resistor rear-stage voltage, and the on-off control is performed on the main contactor and the pre-charging contactor according to the pre-charging time, so that the power-on control of the vehicle air conditioner is realized. The method can calculate the pre-charging time according to the preceding-stage bus voltage and the pre-charging resistor rear-stage voltage, so that the accurate pre-charging time is ensured, the safety of the power battery is ensured, and the self-checking self-diagnosis capability of the vehicle air conditioner is improved.

Description

Power-on control method of vehicle air conditioner, vehicle and computer-readable storage medium
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a power-on control method for a vehicle air conditioner, a vehicle, and a computer-readable storage medium.
Background
At present, a vehicle such as a light rail is provided with a whole vehicle power-on control function, so that a power battery of the whole vehicle and the whole vehicle of a traction system can be ensured to be powered on, but other electric components (such as an air conditioner) of the whole vehicle are all started in a time-sharing manner, if a high-voltage component is in short circuit at the rear stage of an air conditioner directly connected with the high voltage of the power battery, after a high-voltage contactor of the air conditioner is pulled in, the short-circuit current is very large, further, the damage of a whole vehicle fuse or the power battery is directly caused, the high-voltage starting failure of the vehicle is further caused, and the vehicle cannot normally run; meanwhile, the air conditioner of the vehicle which automatically runs needs to have the self-diagnosis and repair capability, and if the starting time sequence of the air conditioner with the electric heater has a problem, the pre-charging failure of the air conditioner or the damage of the pre-charging resistor of the air conditioner can be caused, so that the self-diagnosis and repair capability of the air conditioner of the vehicle is influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a power-on control method for a vehicle air conditioner, so as to calculate a pre-charge time according to a preceding-stage bus voltage and a post-stage voltage of a pre-charge resistor, thereby ensuring a more accurate pre-charge time, contributing to ensuring the safety of a power battery, and improving the self-checking and self-diagnosing capabilities of the vehicle air conditioner.
Another object of the present invention is to provide a computer-readable storage medium.
It is a further object of the invention to propose a vehicle.
In order to achieve the above object, a first embodiment of the present invention provides a power-on control method for an air conditioner of a vehicle, where the vehicle includes a power battery, a pre-charging branch, a capacitor, a main contactor, a vehicle control unit, and an air conditioner controller, where the pre-charging branch includes a pre-charging resistor and a pre-charging contactor, and the power-on control method includes the following steps:
the vehicle control unit sends a pre-charging control command to the air conditioner controller; the air conditioner controller executes a pre-charging program according to the pre-charging control instruction; when the air conditioner controller executes the pre-charging program, the pre-stage bus voltage and the pre-charging resistor rear-stage voltage are obtained, the pre-charging time is calculated according to the pre-stage bus voltage and the pre-charging resistor rear-stage voltage, and the on-off control is performed on the main contactor and the pre-charging contactor according to the pre-charging time, so that the power-on control of the vehicle air conditioner is realized.
According to the power-on control method of the vehicle air conditioner, firstly, the vehicle control unit sends a pre-charging control command to the air conditioner controller, then the air conditioner controller executes a pre-charging program according to the pre-charging control command, obtains the pre-stage bus voltage and the pre-charging resistance post-stage voltage, calculates the pre-charging time according to the pre-stage bus voltage and the pre-charging resistance post-stage voltage, calculates the accurate pre-charging time, and controls the on-off of the main contactor and the pre-charging contactor according to the pre-charging time so as to realize the power-on control of the vehicle air conditioner. Therefore, the pre-charging time can be calculated according to the preceding-stage bus voltage and the pre-charging resistor rear-stage voltage, so that the accurate pre-charging time is ensured, the safety of the power battery is ensured, and the self-checking self-diagnosis capability of the vehicle air conditioner is improved.
To achieve the above object, a second aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the power-on control method of a vehicle air conditioner provided in the first aspect of the present invention.
According to the computer readable storage medium of the embodiment of the invention, when the computer program stored on the computer readable storage medium is executed by the processor, the pre-charging time is calculated according to the pre-stage bus voltage and the pre-charging resistance post-stage voltage, so that the accurate pre-charging time is ensured, the safety of a power battery is favorably ensured, and the self-checking and self-diagnosis capability of the vehicle air conditioner is improved
In order to achieve the above object, a third embodiment of the present invention provides a vehicle, where the vehicle includes a power battery, a pre-charging branch, a capacitor, a main contactor, a vehicle controller, and an air-conditioning controller, where the pre-charging branch includes a pre-charging resistor and a pre-charging contactor, and the vehicle controller is configured to send a pre-charging control command to the air-conditioning controller; the air conditioner controller is used for executing a pre-charging program according to the pre-charging control instruction, and when the air conditioner controller executes the pre-charging program, the air conditioner controller is specifically used for: the method comprises the steps of obtaining a pre-stage bus voltage and a pre-charging resistor rear-stage voltage, calculating pre-charging time according to the pre-stage bus voltage and the pre-charging resistor rear-stage voltage, and controlling on-off of a main contactor and a pre-charging contactor according to the pre-charging time to achieve power-on control of a vehicle air conditioner.
According to the vehicle provided by the embodiment of the invention, the pre-charging time is calculated according to the pre-stage bus voltage and the pre-charging resistance post-stage voltage, so that the accurate pre-charging time is ensured, the safety of a power battery is favorably ensured, and the self-checking self-diagnosis capability of the vehicle air conditioner is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart of a power-on control method of a vehicle air conditioner in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;
fig. 4 is a flowchart of an air conditioner controller according to a specific example of the present invention executing a first precharge process;
FIG. 5 is a flow chart illustrating an exemplary operation of an air conditioning controller after performing a secondary pre-charge sequence;
FIG. 6 is a schematic block diagram of one example of the present invention for performing a precharge sequence.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A power-on control method of a vehicle air conditioner, a vehicle, and a computer-readable storage medium according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a vehicle according to an embodiment of the present invention.
As shown in fig. 1, the vehicle 100 includes: the system comprises a power battery 10, a pre-charging branch circuit 20, a capacitor C, a main contactor K1, a vehicle control unit 30 and an air conditioner controller 40.
The pre-charging branch 20 includes a pre-charging resistor R and a pre-charging contactor K2. The air conditioner controller 40 is connected to the main contactor K1 and the pre-charging contactor K2, respectively, to control on and off of the main contactor K1 and the pre-charging contactor K2. The vehicle Control unit may be a TCMS (Train Control and Management System).
Fig. 2 is a flowchart of a power-on control method of a vehicle air conditioner according to an embodiment of the present invention.
As shown in fig. 2, the power-on control method includes the following steps:
s201, the vehicle control unit sends a pre-charging control command to the air conditioner controller.
Specifically, the vehicle Controller and the air conditioner Controller may communicate with each other through a Controller Area Network (CAN), and the vehicle Controller may send the pre-charge control command to the CAN network, so that the air conditioner Controller obtains the pre-charge control command from the CAN network. The time interval range of the whole vehicle controller sending the pre-charging control command may be 100ms-3000ms (millisecond), and taking 1000ms as an example, the whole vehicle controller may send the pre-charging control command to the CAN network every 1000 ms.
In this embodiment, the pre-charge control command may include a vehicle high-voltage power-on command and an air conditioner operating command, where the air conditioner operating command may include an air conditioner cooling command, an air conditioner heating command, and an air conditioner ventilation command, and when the air conditioner controller receives the pre-charge control command, the pre-charge control may be turned on.
And S202, the air conditioner controller executes a pre-charging program according to a pre-charging control instruction, wherein when the air conditioner controller executes the pre-charging program, the pre-charging time is calculated according to the pre-charging bus voltage and the pre-charging resistance rear-stage voltage, and the on-off control is performed on the main contactor and the pre-charging contactor according to the pre-charging time so as to realize the power-on control of the vehicle air conditioner.
Specifically, after the pre-charging control is started, the air conditioner controller starts to execute a pre-charging program according to a pre-charging control command, firstly, a pre-stage bus voltage and a pre-charging resistance rear-stage voltage are obtained, pre-charging time is calculated according to the pre-stage bus voltage and the pre-charging resistance rear-stage voltage, and then on-off control is carried out on a main contactor and a pre-charging contactor according to the pre-charging time so as to achieve power-on control over the vehicle air conditioner.
In general, the power-on control method of the vehicle air conditioner can calculate the pre-charging time according to the front-stage bus voltage and the pre-charging resistor rear-stage voltage so as to accurately determine the pre-charging time, thereby effectively controlling the implementation of the pre-charging function, effectively avoiding the damage to a power battery and a fuse caused by the short circuit of the air conditioner rear-stage high-voltage component, and being beneficial to improving the self-checking and self-diagnosing capability of the vehicle air conditioner.
Therefore, the method can calculate the pre-charging time according to the preceding-stage bus voltage and the post-stage voltage of the pre-charging resistor, so that the accurate pre-charging time is ensured, the safety of the power battery is ensured, and the self-checking self-diagnosis capability of the vehicle air conditioner is improved.
In an embodiment of the present invention, as shown in fig. 3, the air conditioner 50 may include an electric heater 51 and an electric heating contactor K3, and the pre-charging process may include a first pre-charging process and a second pre-charging process, wherein the air conditioner controller obtains the pre-stage bus voltage and the pre-charging resistance post-stage voltage in step S202 when the air conditioner controller executes the first pre-charging process, and may include: the air conditioner controller acquires the voltage of a preceding-stage bus according to the pre-charging control instruction; the air conditioner controller judges whether the voltage of the preceding-stage bus is smaller than a first working set voltage or not, or whether the voltage of the preceding-stage bus is larger than a second working set voltage or not; and if the voltage of the front-stage bus is greater than or equal to the first working set voltage and less than or equal to the second working set voltage, the air conditioner controller controls the electric heating contactor to be switched off and acquires the voltage of the rear stage of the pre-charging resistor.
In one example, the first operation setting voltage may have a value ranging from 200V to 550V, such as 500V, and the second operation setting voltage may have a value ranging from 700V to 1200V, such as 900V.
Specifically, the air conditioner controller executes a first pre-charging program according to a pre-charging control instruction, firstly, a pre-stage bus voltage is obtained according to the pre-charging control instruction, then, whether the pre-stage bus voltage is smaller than a first work setting voltage or larger than a second work setting voltage is judged, if not, namely, the pre-stage bus voltage is larger than or equal to the first work setting voltage and smaller than or equal to the second work setting voltage, the pre-stage bus voltage meets the condition of first pre-charging at the moment, the electric heating contactor is controlled to be switched off, so that an electric heater of the air conditioner stops running, and a pre-charging resistance post-stage voltage is obtained, so that pre-charging time is calculated according to the pre-stage bus voltage and the pre-charging resistance post-stage voltage.
It should be appreciated that if the pre-stage bus voltage is less than the first operation setting voltage or greater than the second operation setting voltage, the air conditioner controller determines a first pre-charge failure, transmits a first pre-charge failure message to the vehicle controller through the CAN network, and performs a secondary pre-charge procedure in which the pre-charge contactor K2 and the main contactor K1 are opened if the pre-charge contactor K2 and the main contactor K1 are already in a closed state.
For example, if the front-stage bus voltage is greater than or equal to 500V and less than or equal to 900V, the air conditioner controller controls the electric heating contactor to be switched off, and obtains the pre-charging resistor rear-stage voltage, namely the pre-charging resistor rear-stage voltage initial value. And if the voltage of the front-stage bus is less than 500V or more than 900V, the air conditioner controller sends first pre-charging failure information to the vehicle control unit through the CAN network and executes a second pre-charging program.
Therefore, the preceding-stage bus voltage is judged in advance, and the fact that the preceding-stage bus voltage exceeds the first working set voltage is explained, so that the safety of a rear-stage component is guaranteed, and the pre-charging time is saved; in the first pre-charging process, the on-off of the electric heating contactor is controlled according to the voltage of the preceding-stage bus, so that the correctness of a pre-charging sequence and the safety of a pre-charging resistor are ensured.
In one embodiment of the present invention, the air conditioner controller may calculate the pre-charge time according to the following formula:
Figure RE-GDA0002429127950000051
wherein t is the pre-charging time, R is the pre-charging resistor, C is the capacitor, VTIs the preceding bus voltage, V0For the initial value of the post-stage voltage of the pre-charging resistor, Δ V is a voltage difference parameter (preset voltage difference), and the value range of Δ V is 10V-100V, for example, 20V.
Specifically, the resistance value of the pre-charging resistor R and the capacitance value of the capacitor C are known, and the air conditioner controller acquires the preceding-stage bus voltage VTAnd an initial value V of the post-stage voltage of the pre-charging resistor0Then, the pre-charging time t can be calculated according to the above formula.
Further, the air conditioner controller performs on-off control on the main contactor and the pre-charging contactor according to the pre-charging time to realize power-on control of the vehicle air conditioner, and may further include: controlling the pre-charging contactor to be closed; judging at [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTWhether the value is less than a preset percentage or not, wherein delta t1 is a first time parameter, the value range of delta t1 is 0% -100%, and VtThe voltage of the pre-charging resistor at the rear stage; if in [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTGreater than or equal to a predetermined percentage, then it is judged that [ t × (1- Δ t1), t × (1+ Δ t2)]In the time interval, (V)T-Vt)/VTWhether the time is less than the preset percentage or not, wherein the delta t2 is a second time parameter, and the value range of the delta t2 is 0-100%; if at [ t × 1- Δ t1 ], t × 1+ Δ t2)]In the time interval, (V)T-Vt)/VTAnd if the current is less than the preset percentage, controlling the main contactor to be closed to realize the parallel power supply of the main contactor and the pre-charging contactor.
It should be noted that, because there may be a deviation between the pre-charging time t calculated by the component parameter difference and the actual pre-charging time, a first time parameter Δ t1 and a second time parameter Δ t2 with adjustable values are set to correct the pre-charging time, where both the first time parameter Δ t1 and the second time parameter Δ t2 may be 10%. The preset percentage refers to the calculated preset voltage difference percentage delta V/VT before the pre-charging contactor is closed, and the preset percentage is at different preceding-stage bus voltages VTA state is a changing value.
Specifically, taking the first time parameter Δ t1 and the second time parameter Δ t2 as 10% as an example, in step S202, when the air conditioner controller performs on-off control on the main contactor and the pre-charging contactor according to the pre-charging time to achieve power-on control of the vehicle air conditioner, first, the pre-charging contactor is controlled to be closed, so that the power battery 10 supplies power to the pre-charging branch circuit 20, and then the pre-charging resistor rear-stage voltage V is controlled to be lower than the pre-charging resistor rear-stage voltage VtChange, then, at [0, t (1-10%)]In the time interval, the pre-charging resistance post-stage voltage V can be continuously obtainedtAnd judging that the expression is [0, t star (1-10%)]In the time interval, (V)T-Vt)/VTWhether the ratio is less than the preset percentage or not, if so, indicating that the first precharging fails; if not, further judging that the content is [ t (1-10%), t (1+ 10%)]In the time interval, (V)T-Vt)/VTAnd if the current is less than the preset percentage, controlling the main contactor to be closed, and realizing the parallel power supply of the main contactor and the pre-charging contactor so as to carry out the primary pre-charging. Therefore, the calculated pre-charging time is more accurate, andthe reliability of the pre-charging control is ensured.
Further, when the air conditioner controller performs the first pre-charging process, after the main contactor and the pre-charging contactor are powered in parallel, the control method may further include: the air conditioner controller judges whether the voltage of a preceding bus is powered down or whether the whole vehicle feeds back alarm information or not within preset parallel power supply time; if the preceding-stage bus voltage is not powered down and the whole vehicle does not feed back alarm information within the preset parallel power supply time, the air conditioner controller controls the pre-charging contactor to be disconnected and feeds back information of successful pre-charging for the first time to the whole vehicle controller.
Specifically, within the preset parallel power supply time, if the preceding-stage bus voltage is not powered down and no alarm information (such as leakage alarm information) is fed back, the pre-charging contactor is turned off if the pre-charging is successful for the first time, and the information of successful pre-charging for the first time is fed back to the vehicle control unit (such as the TCMS) through the CAN network. The power failure of the preceding bus voltage may be caused by power supply abnormality of the power battery.
In this example, if the preceding bus voltage is powered down or the whole vehicle feeds back alarm information, the air conditioner controller controls the main contactor and the pre-charging contactor to be disconnected.
The preset value range of the parallel power supply time can be 1s-10 s. Taking the preset parallel power supply time as 3s as an example, within 3s, if the voltage of the preceding-stage bus is not powered down and alarm information is not fed back, the pre-charging contactor is disconnected, and information of successful first pre-charging is fed back to the vehicle control unit (such as TCMS) through the CAN network; if the preceding bus voltage is powered down or the whole vehicle feeds back alarm information, the air conditioner controller controls the main contactor and the pre-charging contactor to be disconnected.
Therefore, whether the first pre-charging is successful or not can be judged within the preset parallel power supply time, and the pre-charging contactor is timely disconnected when the first pre-charging is judged to be successful, so that the phenomenon that the current flows backwards to the power battery to cause the power battery to be damaged can be effectively prevented.
Still further, after the air conditioner controller feeds back the information of successful initial pre-charging to the vehicle control unit, the control method may further include: the air conditioner controller executes a pre-charging circulation judgment program to monitor whether the voltage of a preceding-stage bus is powered off or whether the whole vehicle feeds back alarm information or not within the first pre-charging delay time; and if the preceding-stage bus voltage is powered off or the whole vehicle feeds back alarm information within the first pre-charging delay time, the air conditioner controller executes a secondary pre-charging program.
Specifically, after the first pre-charging is successful, the air conditioner controller does not exit the pre-charging procedure, but performs the pre-charging cycle judgment within the first pre-charging delay time. Specifically, whether the preceding-stage bus voltage is powered off or whether the whole vehicle feeds back alarm information or not is monitored within the first pre-charging delay time, and if the preceding-stage bus voltage is powered off or the whole vehicle feeds back the alarm information within the first pre-charging delay time, the air conditioner controller executes a secondary pre-charging program.
In the example, if the preceding bus voltage is powered down or the whole vehicle feeds back alarm information, the air conditioner controller controls the main contactor to be disconnected.
The first pre-charging delay time refers to a time period from the first pre-charging success to the time before the second pre-charging is started, and if the pre-stage bus voltage is powered off or the whole vehicle feeds back alarm information, the air conditioner controller controls the main contactor to be disconnected and executes a second pre-charging program.
Therefore, the failure of the pre-charging resistor and the rear-level high-voltage capacitor component can be early warned in advance through the real-time calculation of the pre-charging time, and the reliability and the safety of pre-charging control are further improved; and a pre-charging circulation judgment program is set, so that the self-checking and self-diagnosing capability of the vehicle air conditioner is further enhanced.
In one example of the present invention, when the air conditioner controller performs the first precharge process, the control method may further include: if in [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTLess than a predetermined percentage, or, at [ t (1- Δ t1), t (1+ Δ t2)]In the time interval, (V)T-Vt)/VTIf the power supply of the power battery is abnormal within the preset parallel power supply time, the air conditioner controller judges that the first pre-charging fails, sends information of the first pre-charging failure to the vehicle controller and executes a secondary pre-charging program.
Wherein the time of the parallel supply is presetThe value range can be 1s-10 s. Specifically, take the preset parallel power supply time as 3s as an example, if the preset parallel power supply time is [0, t (1- Δ t1) ]]In the time interval, (V)T-Vt)/VTLess than a predetermined percentage, or, at [ t (1- Δ t1), t (1+ Δ t2)]In the time interval, (V)T-Vt)/VTAnd if the power supply of the power battery is abnormal within 3s of the preset parallel power supply time, the air conditioner controller judges that the first pre-charging fails, sends information of the first pre-charging failure to the vehicle controller, and executes a secondary pre-charging program, wherein at the moment, the pre-charging failure identification position can be set to be 1.
It is understood that, when it is determined that the first precharge fails, if the state of the precharge contactor or the main contactor is closed, the precharge contactor or the main contactor is opened.
Therefore, when the first pre-charging failure is judged, the first pre-charging failure information is sent to the vehicle controller, and the secondary pre-charging program is executed, so that the power-on control of the vehicle air conditioner is realized through the secondary pre-charging, and the phenomenon of power-on failure of the vehicle air conditioner caused by the first pre-charging failure is avoided.
As can be seen from the above embodiments and examples, in a specific example of the present invention, as shown in fig. 4, the air conditioner controller may perform the first pre-charging procedure including the following steps:
s401, the vehicle controller sends a pre-charging control command to the air conditioner controller (i.e., step S201).
S402, the air conditioner controller starts pre-charging control.
And S403, the air conditioner controller acquires the voltage of the front-stage bus.
S404, the air conditioner controller judges whether the voltage of the preceding-stage bus is smaller than a first working set voltage or larger than a second working set voltage, if so, the step S405 is executed; if not, step S406 is performed.
S405, judging that the first pre-charging fails, sending first pre-charging failure information to the vehicle control unit, and executing step S419.
And S406, the air conditioner controller controls the electric heating contactor to be disconnected and obtains the voltage of the rear stage of the pre-charging resistor.
And S407, the air conditioner controller calculates the pre-charging time t according to the pre-stage bus voltage and the pre-charging post-stage voltage.
And S408, the air conditioner controller controls the closing of the pre-charging contactor.
S409, judging at [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTWhether the percentage is less than the preset percentage, if so, executing step S418; if not, step S410 is performed.
S410, judging at [ t (1-delta t1), t (1+ delta t2)]In the time interval, (V)T-Vt)/VTWhether the percentage is less than the preset percentage or not, if so, executing the step S411; if not, step S418 is performed.
And S411, controlling the main contactor to be closed, and realizing the parallel power supply of the main contactor and the pre-charging contactor.
S412, judging whether the voltage of the preceding bus is powered off or whether the whole vehicle feeds back alarm information or not within the preset parallel power supply time, and if so, executing the step S413; if not, step S414 is performed.
And S413, judging that the first pre-charging fails, disconnecting the pre-charging contactor and the main contactor, and sending information of the first pre-charging failure to the vehicle control unit.
And S414, the air conditioner controller controls the pre-charging contactor to be disconnected and feeds back information of successful first pre-charging to the vehicle controller.
In step S415, a precharge cycle determination process is started.
S416, monitoring whether the voltage of the front-stage bus is powered off or whether the whole vehicle feeds back alarm information or not within the first pre-charging delay time, and if so, executing the step S417; if not, the process returns to step S415.
And S417, disconnecting the main contactor, sending fault information to the vehicle control unit, and executing the step S419.
And S418, judging that the first pre-charging fails, disconnecting the pre-charging contactor, sending first pre-charging failure information to the vehicle controller, and executing the step S419.
And S419, the air conditioner controller executes a secondary pre-charging program.
In one example of the present invention, the control method may further include: when the secondary pre-charging is successful, the air conditioner controller judges whether the voltage of the preceding bus is powered down or whether the whole vehicle feeds back alarm information or not within the secondary pre-charging delay time; and if the preceding-stage bus voltage is not powered down and the whole vehicle does not feed back alarm information, the air conditioner controller feeds back secondary pre-charging success information to the whole vehicle controller.
The value range of the secondary pre-charging delay setting time can be 1s-120 s. Specifically, taking the secondary pre-charging delay set time as 60s as an example, after the secondary pre-charging is completed, the air-conditioning controller can judge whether the secondary pre-charging is successful, if the secondary pre-charging is successful, the vehicle air-conditioning is not started immediately, but within the secondary pre-charging delay set time 60s, the air-conditioning controller continuously monitors and judges whether the voltage of the front-stage bus is powered down or whether the whole vehicle feeds back alarm information, if the voltage of the front-stage bus is not powered down and the whole vehicle does not feed back the alarm information, the air-conditioning controller feeds back the secondary pre-charging success information to the whole vehicle controller, and at this time, the pre-charging failure flag bit can be set to be 0; if the secondary pre-charging is unsuccessful, the air conditioner controller CAN send secondary pre-charging failure information and fault information through the CAN network, and disconnect the main contactor and the pre-charging contactor to exit the pre-charging circulation judgment program.
That is, in one specific example, as shown in fig. 5, the air conditioner controller may perform the following steps after performing the secondary precharge process:
s501, judging whether the secondary pre-charging is successful, if so, executing the step S503; if not, step S502 is performed.
And S502, sending secondary pre-charging failure information and fault information, and disconnecting the main contactor and the pre-charging contactor.
S503, judging whether the preceding-stage bus voltage is powered off or whether the whole vehicle feeds back alarm information or not within the secondary pre-charging delay time, and if so, executing the step S502; if not, step S504 is performed.
And S504, the air conditioner controller feeds back information of successful secondary pre-charging to the vehicle controller.
In summary, as shown in fig. 6, the pre-charge process may include a first pre-charge process, a pre-charge cycle determination process and a second pre-charge process, in practical applications, the air conditioner controller may first perform a first pre-charging process, then perform a cycle judgment process when the first pre-charging process is successful, wherein, in the course of executing the first precharge procedure or the cycle judging procedure, if it is determined that the first precharge fails, a secondary pre-charge process is performed, the steps of performing the secondary pre-charge process and performing the primary pre-charge process may be the same, after the secondary pre-charging program is successfully executed in the preliminary judgment, whether the voltage of the front-stage bus is powered off or whether the whole vehicle feeds back alarm information is further judged to verify whether the secondary pre-charging program is successful or not, therefore, the safety and reliability of secondary pre-charging control are ensured, and the safety and reliability of power-on control of the vehicle air conditioner are further ensured.
In summary, the power-on control method of the vehicle air conditioner according to the embodiment of the invention can not only calculate the accurate pre-charging time, but also can perform the advanced judgment of the preceding-stage bus voltage, so as to explain that the preceding-stage bus voltage exceeds the set voltage range, thereby ensuring the safety of the subsequent-stage component and saving the pre-charging time; in the process of first pre-charging, the on-off of the electric heating contactor is controlled, so that the pre-charging time sequence and the safety of a pre-charging resistor are ensured; by calculating the pre-charging time in real time, the failure of the pre-charging resistor and the rear-level high-voltage capacitor component can be pre-warned in advance, and the reliability and safety of pre-charging control are further improved; and a pre-charging circulation judgment program is set, so that the self-checking and self-diagnosing capability of the vehicle air conditioner is further enhanced.
Further, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the power-on control method of the vehicle air conditioner according to the above-described embodiment of the present invention.
When the computer program stored in the computer readable storage medium is executed by the processor, the pre-charging time can be calculated according to the voltage of the front-stage bus and the voltage of the rear stage of the pre-charging resistor, so that the accurate pre-charging time is ensured, the safety of the power battery is ensured, and the self-checking and self-diagnosing capability of the vehicle air conditioner is improved.
Based on the same inventive concept, the embodiment of the invention provides a vehicle, and the structural schematic of the vehicle is shown in fig. 1.
Referring to fig. 1, the vehicle 100 includes a power battery 10, a pre-charging branch 20, a capacitor C, a main contactor K1, a vehicle controller 30, and an air conditioner controller 40, wherein the pre-charging branch 20 includes a pre-charging resistor R and a pre-charging contactor K2.
The vehicle control unit 30 is configured to send a pre-charging control command to the air conditioner controller; the air conditioner controller 40 is configured to execute a pre-charging program according to the pre-charging control instruction, and when the air conditioner controller 40 executes the pre-charging program, the air conditioner controller is specifically configured to: the method comprises the steps of obtaining a pre-stage bus voltage and a pre-charging resistor rear-stage voltage, calculating pre-charging time according to the pre-stage bus voltage and the pre-charging resistor rear-stage voltage, and controlling on-off of a main contactor K1 and a pre-charging contactor K2 according to the pre-charging time to achieve power-on control of the vehicle air conditioner.
In this embodiment, referring to fig. 1, the air conditioner controller 40 is connected to the main contactor K1 and the pre-charging contactor K2, respectively, to control on and off of the main contactor K1 and the pre-charging contactor K2. The vehicle Control unit may be a TCMS (Train Control and Management System).
Specifically, in practical applications, first, the vehicle control unit 30 may send a pre-charge control command to the air conditioner controller 40 through the CAN network, and then the air conditioner controller 40 executes a pre-charge program according to the pre-charge control command, specifically, the air conditioner controller 40 obtains a pre-stage bus voltage and a pre-charge resistance post-stage voltage, calculates a pre-charge time according to the pre-stage bus voltage and the pre-charge resistance post-stage voltage, and performs on-off control on the main contactor K1 and the pre-charge contactor K2 according to the pre-charge time, so as to implement power-on control on the vehicle air conditioner.
It should be noted that, for other specific embodiments of the vehicle according to the embodiment of the present invention, reference may be made to the specific embodiment of the method for controlling a vehicle air conditioner according to the above embodiment of the present invention, and details are not described herein again in order to avoid redundancy.
According to the vehicle provided by the embodiment of the invention, the pre-charging time can be calculated according to the pre-stage bus voltage and the pre-charging resistance post-stage voltage, so that the accurate pre-charging time is ensured, the safety of a power battery is favorably ensured, and the self-checking self-diagnosis capability of the vehicle air conditioner is improved.
In addition, other configurations and functions of the vehicle according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail to reduce redundancy.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (12)

1. The power-on control method of the vehicle air conditioner is characterized in that the vehicle comprises a power battery, a pre-charging branch circuit, a capacitor, a main contactor, a vehicle control unit and an air conditioner controller, wherein the pre-charging branch circuit comprises a pre-charging resistor and a pre-charging contactor, and the power-on control method comprises the following steps:
the vehicle control unit sends a pre-charging control command to the air conditioner controller;
the air conditioner controller executes a pre-charging program according to the pre-charging control instruction;
when the air conditioner controller executes the pre-charging program, acquiring a pre-stage bus voltage and a pre-charging resistor rear-stage voltage, calculating pre-charging time according to the pre-stage bus voltage and the pre-charging resistor rear-stage voltage, and controlling the on-off of the main contactor and the pre-charging contactor according to the pre-charging time so as to realize the power-on control of the vehicle air conditioner;
wherein, the air conditioner controller carries out on-off control to main contactor with the preliminary filling contactor according to the preliminary filling time to realize the power-on control to vehicle air conditioner, include: controlling the pre-charging contactor to be closed; judging at [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTWhether the time is less than the preset percentage or not, wherein delta t1 is a first time parameter, the value range of delta t1 is 0% -100%, and VtThe voltage of the post stage of the pre-charging resistor is the voltage of the post stage of the pre-charging resistor; if in [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTGreater than or equal to the predetermined percentage, then a determination is made as [ t × 1- Δ t1 ], t × 1+ Δ t2)]In the time interval, (V)T-Vt)/VTWhether the time is less than the preset percentage or not is judged, wherein the delta t2 is a second time parameter, and the value range of the delta t2 is 0% -100%; if at [ t × 1- Δ t1 ], t × 1+ Δ t2)]In the time interval, (V)T-Vt)/VTIf the preset percentage is less than the preset percentage, the main contactor is controlled to be closed, the main contactor and the pre-charging contactor are powered in parallel, wherein t is the pre-charging time VTIs the preceding bus voltage.
2. The power-on control method of a vehicle air conditioner according to claim 1, wherein the air conditioner includes an electric heater and an electric heating contactor, the pre-charging process includes a first pre-charging process and a second pre-charging process, wherein the air conditioner controller acquires a pre-stage bus voltage and a pre-charging resistance post-stage voltage when the air conditioner controller executes the first pre-charging process, and includes:
the air conditioner controller acquires the voltage of a preceding-stage bus according to the pre-charging control instruction;
the air conditioner controller judges whether the preceding-stage bus voltage is smaller than a first working set voltage or not, or whether the preceding-stage bus voltage is larger than a second working set voltage or not;
and if the voltage of the front-stage bus is greater than or equal to the first working set voltage and less than or equal to the second working set voltage, the air conditioner controller controls the electric heating contactor to be switched off and acquires the voltage of the rear stage of the pre-charging resistor.
3. The power-on control method of a vehicle air conditioner according to claim 1, wherein the air conditioner controller calculates the pre-charge time according to the following formula:
Figure FDA0003605021540000021
wherein R is the pre-charging resistor, C is the capacitor, and V0And delta V is an initial value of the post-stage voltage of the pre-charging resistor, is a differential pressure parameter and ranges from 10V to 100V.
4. The power-on control method of a vehicle air conditioner according to claim 2, wherein the air conditioner controller performs the first precharge process after the main contactor is powered in parallel with the precharge contactor, the control method further comprising:
the air conditioner controller judges whether the voltage of a preceding bus is powered off or whether the whole vehicle feeds back alarm information or not within preset parallel power supply time;
if the pre-stage bus voltage is not powered down and the whole vehicle does not feed back alarm information within the preset parallel power supply time, the air conditioner controller controls the pre-charging contactor to be disconnected and feeds back information of successful pre-charging for the first time to the whole vehicle controller.
5. The power-on control method of the vehicle air conditioner according to claim 4, wherein after the air conditioner controller feeds back the first successful pre-charging information to the vehicle control unit, the control method further comprises:
the air conditioner controller executes a pre-charging circulation judgment program to monitor whether the voltage of a preceding-stage bus is powered off or whether the whole vehicle feeds back alarm information or not within a first pre-charging delay time, wherein the first pre-charging delay time refers to a time period from the successful first pre-charging to the beginning of the second pre-charging;
and if the preceding-stage bus voltage is in the first pre-charging delay time and the power failure or the whole vehicle feeds back alarm information, the air conditioner controller executes the secondary pre-charging program.
6. The power-on control method of an air conditioner for a vehicle according to claim 4, wherein when the air conditioner controller executes the first precharge process, the control method further comprises:
if in [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTLess than said predetermined percentage, or, at [ t (1- Δ t1), t (1+ Δ t2)]In the time interval, (V)T-Vt)/VTIf the power supply of the power battery is abnormal within the preset parallel power supply time, the air conditioner controller judges that the primary pre-charging fails, sends primary pre-charging failure information to the vehicle controller, and executes the secondary pre-charging program.
7. The power-on control method of a vehicular air conditioner according to claim 5 or 6, characterized by further comprising:
when the secondary pre-charging is successful, the air conditioner controller judges whether the voltage of the preceding bus is powered off or whether the whole vehicle feeds back alarm information or not within the secondary pre-charging delay time;
and if the preceding-stage bus voltage is not powered down and the whole vehicle does not feed back alarm information, the air conditioner controller feeds back secondary pre-charging success information to the whole vehicle controller.
8. The power-on control method of a vehicle air conditioner according to claim 4 or 5, characterized by further comprising:
if the preceding bus voltage is powered down or the whole vehicle feeds back alarm information, the air conditioner controller controls the main contactor to be disconnected.
9. The power-on control method of the vehicle air conditioner according to claim 2, wherein the first operating set voltage has a value ranging from 200V to 550V, and the second operating set voltage has a value ranging from 700V to 1200V.
10. The power-on control method of the vehicle air conditioner according to claim 7, wherein the preset parallel power supply time ranges from 1s to 10s, and the secondary pre-charging delay time setting time ranges from 1s to 120 s.
11. A computer-readable storage medium on which a computer program is stored, the computer program, when being executed by a processor, implementing a power-on control method of a vehicle air conditioner according to any one of claims 1 to 10.
12. A vehicle is characterized by comprising a power battery, a pre-charging branch circuit, a capacitor, a main contactor, a vehicle control unit and an air conditioner controller, wherein the pre-charging branch circuit comprises a pre-charging resistor and a pre-charging contactor,
the vehicle control unit is used for sending a pre-charging control command to the air conditioner controller;
the air conditioner controller is used for executing a pre-charging program according to the pre-charging control instruction, and when the air conditioner controller executes the pre-charging program, the air conditioner controller is specifically used for:
acquiring a pre-stage bus voltage and a pre-charging resistor rear-stage voltage, calculating pre-charging time according to the pre-stage bus voltage and the pre-charging resistor rear-stage voltage, and performing on-off control on the main contactor and the pre-charging contactor according to the pre-charging time to realize power-on control on a vehicle air conditioner;
wherein, the air conditioner controller carries out on-off control to main contactor with the preliminary filling contactor according to the preliminary filling time to realize the power-on control to vehicle air conditioner, include: controlling the pre-charging contactor to be closed; judging at [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTWhether the time is less than the preset percentage or not, wherein delta t1 is a first time parameter, the value range of delta t1 is 0% -100%, and VtThe voltage of the post stage of the pre-charging resistor is the voltage of the post stage of the pre-charging resistor; if in [0, t (1-delta t1)]In the time interval, (V)T-Vt)/VTGreater than or equal to the predetermined percentage, then a determination is made as [ t × 1- Δ t1 ], t × 1+ Δ t2)]In the time interval, (V)T-Vt)/VTWhether the time is less than the preset percentage or not is judged, wherein the delta t2 is a second time parameter, and the value range of the delta t2 is 0% -100%; if at [ t × 1- Δ t1 ], t × 1+ Δ t2)]In the time interval, (V)T-Vt)/VTIf the preset percentage is less than the preset percentage, the main contactor is controlled to be closed, the main contactor and the pre-charging contactor are powered in parallel, wherein t is the pre-charging time VTIs the preceding bus voltage.
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