CN113447720B - Finished automobile Y-capacitor detection system and method and new energy vehicle - Google Patents
Finished automobile Y-capacitor detection system and method and new energy vehicle Download PDFInfo
- Publication number
- CN113447720B CN113447720B CN202010230619.7A CN202010230619A CN113447720B CN 113447720 B CN113447720 B CN 113447720B CN 202010230619 A CN202010230619 A CN 202010230619A CN 113447720 B CN113447720 B CN 113447720B
- Authority
- CN
- China
- Prior art keywords
- voltage
- capacitance
- capacitor
- detection device
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The disclosure relates to a whole vehicle Y capacitor detection system and method and a new energy vehicle. The system comprises: the system comprises a low-voltage storage battery, a control unit, a boost converter, an inverter and a Y capacitance detection device; the control unit is used for respectively sending starting signals to the boost converter and the inverter if the positive contactor and the negative contactor of the power battery are determined to be disconnected when the high-voltage system is electrified; the boost converter is used for boosting the low-voltage direct current of the low-voltage storage battery into high-voltage direct current after receiving the starting signal; the inverter is used for inverting the high-voltage direct current into alternating current with preset frequency and preset voltage value after receiving the starting signal; the Y capacitor detection device is used for detecting the first Y capacitor, the second Y capacitor and the third Y capacitor in a time-sharing manner and sending the first Y capacitor, the second Y capacitor and the third Y capacitor to the control unit; the control unit is further used for determining the sum of the first Y capacitor, the second Y capacitor and the third Y capacitor as the Y capacitor of the whole vehicle. Therefore, the Y capacitor of the whole vehicle can be simply, quickly and accurately detected.
Description
Technical Field
The disclosure relates to the technical field of new energy vehicles, in particular to a finished automobile Y capacitor detection system and method and a new energy vehicle.
Background
The Y capacitor refers to a capacitor between a whole vehicle high-voltage system and a whole vehicle body ground (wherein the whole vehicle body ground refers to a negative electrode shared by a whole vehicle low-voltage electric appliance, namely a whole vehicle body framework, and a general whole vehicle high-low voltage part metal shell is connected to the whole vehicle body ground), and is related to the whole vehicle Electromagnetic Compatibility (EMC) performance and the whole vehicle electric safety information, the whole vehicle Y capacitor detection can facilitate the whole vehicle EMC test and correction, and the whole vehicle Y capacitor can be adjusted more quickly under the known whole vehicle Y capacitor condition, so that the whole vehicle EMC performance is improved. In addition, the Y capacitor of the whole vehicle is also related to the leakage current of a high-voltage system of the whole vehicle to the ground of the vehicle body, and the safety of drivers and passengers and the safety of the vehicle are directly influenced by the magnitude of the leakage current. The EMC performance is improved to a certain extent though the Y capacitance of the whole automobile is too large, the leakage current is increased, and the safety risk of drivers and passengers is increased, so that the research on the Y capacitance of the whole automobile is very necessary.
At present, no method for detecting the Y capacitance of the whole vehicle in a standard manner exists domestically, and a standard detection method aiming at the Y capacitance of the whole vehicle internationally is also in a discussion stage. At present, the Y capacitance of the whole vehicle is detected mainly by three modes, namely an electrifying method, a bridge method and an insulation voltage-resistant method.
The power-on method is characterized in that the Y capacitance of the whole vehicle is calculated according to the charge-discharge principle of the capacitor and the charge-discharge time of the Y capacitance of the whole vehicle. The method can test the Y capacitance of the whole vehicle during high-voltage electrification, but has larger measurement error.
The bridge method is to calculate the capacitance by using the bridge balance principle, and is commonly used for testing the Y capacitance of high-voltage parts. The method has accurate test result, but cannot carry out live test, and the test instrument is expensive.
According to the insulation voltage-resistant method, according to a capacitor direct connection and intersection principle, alternating current with the frequency f and the voltage U is applied to a vehicle body ground through a vehicle high-voltage system, and then the size of a vehicle Y capacitor C is calculated according to leakage current I and a formula I of 2 pi · f · C · U. The method has relatively accurate test result, and the test instrument is relatively cheap but cannot carry out live test.
Disclosure of Invention
In order to overcome the problems in the related art, the invention provides a whole vehicle Y capacitor detection system and method and a new energy vehicle.
In order to achieve the above object, according to a first aspect of the embodiments of the present disclosure, a system for detecting Y capacitance of a finished vehicle is provided, including:
the low-voltage storage battery, the control unit, the boost converter, the inverter and the Y capacitance detection device;
the control unit is respectively connected with the boost converter and the inverter and is used for respectively sending starting signals for indicating to start the Y capacitance detection device to the boost converter and the inverter if the positive contactor and the negative contactor of the power battery are both in a disconnected state when the high-voltage system is electrified;
the boost converter is connected with the low-voltage storage battery and used for boosting the low-voltage direct current of the low-voltage storage battery into high-voltage direct current after receiving the starting signal;
one end of the inverter is connected with the boost converter, the other end of the inverter is connected with the Y capacitance detection device, and the inverter is used for inverting the high-voltage direct current into alternating current with preset frequency and preset voltage value after receiving the starting signal so as to supply power to the Y capacitance detection device;
the Y capacitor detection device is connected with the control unit and used for detecting a first Y capacitor, a second Y capacitor and a third Y capacitor in a time-sharing manner and sending the first Y capacitor, the second Y capacitor and the third Y capacitor to the control unit, wherein the first Y capacitor is a Y capacitor with a high-voltage direct-current side negative electrode facing a vehicle body ground, the second Y capacitor is a Y capacitor with a high-voltage direct-current side positive electrode facing the vehicle body ground, and the third Y capacitor is a Y capacitor with a high-voltage alternating-current side facing the vehicle body ground;
the control unit is further configured to determine the sum of the received first Y capacitor, the received second Y capacitor and the received third Y capacitor as a finished automobile Y capacitor.
Optionally, the control unit is further configured to control the negative contactor of the power battery to pull in and send a first detection instruction to the Y capacitance detection device when the Y capacitance detection device is powered on and detection is not started;
the Y capacitance detection device is used for detecting the first Y capacitance in the following way:
after the first detection instruction is received, applying the alternating current between the high-voltage direct-current side negative electrode and the vehicle body ground;
and detecting a first leakage current between the high-voltage direct-current side negative electrode and the ground of the vehicle body, and determining the first Y capacitor according to the first leakage current, the preset frequency and the preset voltage.
Optionally, the Y capacitance detecting device is configured to determine the first Y capacitance according to the first leakage current, the preset frequency, and the preset voltage by using the following formula:
wherein, C1The first Y capacitor; i is1Is the first leakage current; f is the preset frequency; u is the voltage.
Optionally, the control unit is further configured to:
under the conditions that the Y capacitance detection device is electrified and detection is not started, controlling an anode contactor of the power battery to be attracted, and controlling contactors of the high-voltage components to be attracted;
sending a second detection instruction to the Y capacitance detection device;
the Y capacitance detection device is used for detecting the second Y capacitance by the following modes:
after the second detection instruction is received, applying the alternating current between the high-voltage direct-current side positive electrode and the vehicle body ground;
and detecting a second leakage current between the positive electrode of the high-voltage direct current side and the ground of the vehicle body, and determining the second Y capacitor according to the second leakage current, the preset frequency and the preset voltage.
Optionally, the control unit is further configured to send a third detection instruction to the Y capacitance detection device when the Y capacitance detection device is powered on and detection is not started;
the Y capacitance detection device is used for detecting the third Y capacitance by the following method:
after receiving the third detection instruction, respectively applying the alternating current between three cross current sides of the high-voltage components and the ground of the vehicle body;
and detecting a third leakage current between the high-voltage alternating current side and the ground of the vehicle body, and determining the third Y capacitor according to the third leakage current, the preset frequency and the preset voltage.
Optionally, the boost converter is configured to: and after the starting signal is received, if the voltage of the low-voltage storage battery is greater than a preset voltage threshold value, boosting the low-voltage direct current of the low-voltage storage battery into high-voltage direct current.
Optionally, the boost converter is a boost DC-DC converter or a bidirectional DC-DC converter; and/or
The inverter is a DC/AC inverter in the steering controller.
According to a second aspect of the embodiments of the present disclosure, a method for detecting a Y capacitance of a finished vehicle is provided, including:
when a control unit is electrified in a high-voltage system, if the control unit determines that a positive contactor and a negative contactor of a power battery are both in a disconnected state, starting signals for indicating to start a Y capacitance detection device are respectively sent to a boost converter and an inverter;
after receiving the starting signal, the boost converter boosts the low-voltage direct current of the low-voltage storage battery into high-voltage direct current;
after receiving the starting signal, the inverter inverts the high-voltage direct current into alternating current with a preset frequency and a preset voltage value so as to supply power for the Y capacitance detection device;
the Y capacitance detection device detects a first Y capacitance, a second Y capacitance and a third Y capacitance in a time-sharing mode, and sends the first Y capacitance, the second Y capacitance and the third Y capacitance to the control unit, wherein the first Y capacitance is a Y capacitance of a high-voltage direct-current side negative electrode to a vehicle body ground, the second Y capacitance is a Y capacitance of a high-voltage direct-current side positive electrode to the vehicle body ground, and the third Y capacitance is a Y capacitance of a high-voltage alternating-current side to the vehicle body ground;
and the control unit determines the sum of the received first Y capacitor, the received second Y capacitor and the received third Y capacitor as the Y capacitor of the whole vehicle.
Optionally, the step-up converter, after receiving the start signal, steps up the low-voltage dc power of the low-voltage battery to a high-voltage dc power, and includes:
and after receiving the starting signal, if the voltage of the low-voltage storage battery is greater than a preset voltage threshold value, the boost converter boosts the low-voltage direct current of the low-voltage storage battery into high-voltage direct current.
According to a third aspect of the embodiments of the present disclosure, there is provided a new energy vehicle including: the utility model discloses the first aspect provides whole car Y electric capacity detecting system.
In the technical scheme, the whole vehicle Y capacitor detection system can obtain the whole vehicle Y capacitor by detecting the Y capacitor of the negative pole of the high-voltage direct current side to the vehicle body ground, the Y capacitor of the positive pole of the high-voltage direct current side to the vehicle body ground and the Y capacitor of the high-voltage alternating current side to the vehicle body ground in a time-sharing manner, namely, the whole vehicle Y capacitor detection system can realize the detection of the whole vehicle Y capacitor through three times of tests without separately testing the Y capacitors of all high-voltage parts (usually about 10 high-voltage parts) of the whole vehicle (wherein the separate tests are not only time-consuming, but also the more the separate tests are, the larger the error of the whole vehicle Y capacitor (which is the sum of the Y capacitors of all high-voltage parts) is), so that the efficiency and the accuracy of the whole vehicle Y capacitor detection are improved. In addition, the detection of the Y capacitor of the whole vehicle can be realized by using simple components such as a low-voltage storage battery, a boost converter, an inverter, a control unit and a Y capacitor detection device (which is a current detection device in essence), and an expensive Y capacitor test instrument is omitted, so that the problem can be solved by self-checking on the vehicle when the vehicle is abnormal, and the requirements of electrified detection can be met, and the detection is convenient and fast. In addition, the whole vehicle Y capacitor is simply, quickly and accurately detected, and the whole vehicle EMC is more conveniently tested and rectified, so that the whole vehicle EMC performance and the safety of drivers and passengers are improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:
fig. 1 is a block diagram illustrating a structure of a vehicle Y capacitance detection system according to an exemplary embodiment.
Fig. 2 is a circuit schematic of a boost converter shown in accordance with an exemplary embodiment.
Fig. 3 is a circuit schematic of an inverter shown in accordance with an exemplary embodiment.
Fig. 4 is a flowchart illustrating a method for detecting Y capacitance of a vehicle according to an exemplary embodiment.
Description of the reference numerals
1 low-voltage accumulator 2 control unit
3 boost converter 4 inverter
5Y capacitance detection device
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram illustrating a structure of a vehicle Y capacitance detection system according to an exemplary embodiment. Referring to fig. 1, the system may include a low-voltage battery 1, a control unit 2, a boost converter 3, an inverter 4, and a Y capacitance detection device 5. The control unit 2 is connected to the low-voltage battery 1, the boost converter 3, the inverter 4, and the Y capacitance detection device 5, and the low-voltage battery 1, the boost converter 3, the inverter 4, and the Y capacitance detection device 5 are connected in series in this order.
The low-voltage storage battery 1 can provide electric energy for Y capacitance detection, wherein the low-voltage storage battery can provide electric energy for low-voltage parts on a new energy vehicle (the rated voltage is 12V or 24V), and can also be an additionally arranged low-voltage storage battery.
The control unit 2 may be a Battery Management System (BMS) of the new energy vehicle, a vehicle control unit, or other components having a control function.
The boost converter 3 can boost the low voltage of the low-voltage battery 1. The high-voltage component with the boosting function can be a Direct Current-Direct Current (DC-DC) converter, a bidirectional DC-DC converter and other high-voltage components with the boosting function on a new energy vehicle. A schematic circuit diagram of the boost converter 3 is shown in fig. 2 (in fig. 2, L1 is a coil, D is a diode, C is a capacitor, R is a resistor, and M is a switching tube (for example, an Insulated Gate Bipolar Transistor (IGBT), a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), etc., and an IGBT is illustrated in fig. 2)).
The inverter 4 may perform DC/AC (Direct Current/Alternating Current) inversion of the boosted voltage of the boost converter 3 into an Alternating Current of a preset frequency (e.g., 1kHZ) and a preset voltage (e.g., 500V). For example, the inverter 4 may be a DC/AC inverter in a steering controller on a new energy vehicle or a high-voltage component that can perform DC/AC inversion. The circuit schematic diagram of the inverter 4 is shown in fig. 3 (in fig. 3, L2 is a coil, C1 and C2 are capacitors, and Q1 to Q6 are switching tubes (for example, IGBTs, MOSFETs, etc., and an example of an IGBT in fig. 3), and the ac load may be a charging pile, for example).
The Y capacitance detecting device 5 may include a current detecting device, which detects the magnitude of leakage current to achieve the purpose of detecting the Y capacitance of the entire vehicle, wherein, when the Y capacitance detecting device 5 starts to work, the control unit 2 (e.g., BMS) may sequentially control the actuation of the corresponding high-voltage circuit contactors to perform Y capacitance detection.
Preferably, the low-voltage battery 1, the control unit 2, the boost converter 3, and the inverter 4 are all existing components on a new energy vehicle, for example, the control unit 2 is a BMS, the boost converter 3 is a bidirectional DC-DC converter, and the inverter 4 is a DC/AC inverter in a steering controller. Like this, only need additionally to add a Y electric capacity detection device and can realize the detection of whole car Y electric capacity, it is less to whole car structural transformation, and transformation cost and detection cost are low.
Specifically, the control unit 2 may be configured to send a start signal instructing to start the Y capacitance detection device 5 to the boost converter 3 and the inverter 4, respectively, when it is determined that both the positive contactor and the negative contactor of the power battery are in the off state during the power-on of the high-voltage system.
When the high-voltage system is powered on, the control unit 2 firstly detects whether the anode contactor and the cathode contactor of the power battery are both in an off state, and then performs the detection work of the Y capacitor of the whole vehicle when determining that the anode contactor and the cathode contactor are both in the off state, so that the influence of the high voltage of the power battery on the detection result can be avoided.
The boost converter 3 may be configured to boost the low-voltage dc power of the low-voltage battery 1 into a high-voltage dc power (e.g., 400V) after receiving the start signal sent by the control unit 2, wherein the high-voltage dc power may provide power for the inverter 4.
The inverter 4 may be configured to invert the high-voltage direct current into an alternating current with a preset frequency (e.g., 1kHZ) and a preset voltage value (e.g., 500V) after receiving the start signal sent by the control unit 2, so as to supply power to the Y capacitance detecting device 5, and at this time, the Y capacitance detecting device 5 is powered to start to enter an operating state.
The Y capacitance detecting device 5 may be configured to detect the first Y capacitance, the second Y capacitance, and the third Y capacitance in a time-sharing manner, that is, the Y capacitance detecting device 5 detects one of the first Y capacitance, the second Y capacitance, and the third Y capacitance at a time, and sends them to the control unit 2.
For example, the Y capacitance detection device 5 may detect the first Y capacitance, the second Y capacitance, and the third Y capacitance in sequence.
Further, for example, the Y capacitance detection device 5 may detect the first Y capacitance, the third Y capacitance, and the second Y capacitance in sequence.
The first Y capacitor is a Y capacitor of a high-voltage direct current side negative electrode to a vehicle body ground, and mainly comprises a Y capacitor of a driving controller high-voltage direct current side negative electrode to the vehicle body ground, a Y capacitor of an air conditioner high-voltage direct current side negative electrode to the vehicle body ground, a Y capacitor of a voltage reduction DC high-voltage negative electrode to the vehicle body ground, and a Y capacitor of an air compressor controller high-voltage direct current side negative electrode to the vehicle body ground; the second Y capacitor is a Y capacitor of a positive electrode of the high-voltage direct current side to the vehicle body ground, and mainly comprises a Y capacitor of a positive electrode of the high-voltage direct current side of the driving controller to the vehicle body ground, a Y capacitor of a positive electrode of the high-voltage direct current side of the air conditioner to the vehicle body ground, a Y capacitor of a high-voltage step-down DC high-voltage positive electrode to the vehicle body ground, and a Y capacitor of a positive electrode of the high-voltage direct current side of the air compressor controller to the vehicle body ground; the third Y capacitor is a Y capacitor with a high-voltage alternating current side opposite to the vehicle body ground, and mainly comprises a Y capacitor with a driving motor alternating current side opposite to the vehicle body ground, a Y capacitor with an air compressor alternating current side opposite to the vehicle body ground, a Y capacitor with a steering motor alternating current side opposite to the vehicle body ground, and a Y capacitor with an air conditioner compressor alternating current side opposite to the vehicle body ground.
The control unit 2 may be further configured to determine a sum of the received first Y capacitor, the received second Y capacitor, and the received third Y capacitor as a finished vehicle Y capacitor.
In the technical scheme, the whole vehicle Y capacitor detection system can obtain the whole vehicle Y capacitor by detecting the Y capacitor of the negative pole of the high-voltage direct current side to the vehicle body ground, the Y capacitor of the positive pole of the high-voltage direct current side to the vehicle body ground and the Y capacitor of the high-voltage alternating current side to the vehicle body ground in a time-sharing manner, namely, the whole vehicle Y capacitor detection system can realize the detection of the whole vehicle Y capacitor through three times of tests without separately testing the Y capacitors of all high-voltage parts (usually about 10 high-voltage parts) of the whole vehicle (wherein the separate tests are not only time-consuming, but also the more the separate tests are, the larger the error of the whole vehicle Y capacitor (which is the sum of the Y capacitors of all high-voltage parts) is), so that the efficiency and the accuracy of the whole vehicle Y capacitor detection are improved. In addition, the detection of the Y capacitor of the whole vehicle can be realized by using simple components such as a low-voltage storage battery, a boost converter, an inverter, a control unit and a Y capacitor detection device (which is a current detection device in essence), and an expensive Y capacitor test instrument is omitted, so that the problem can be solved by self-checking on the vehicle when the vehicle is abnormal, and the requirements of electrified detection can be met, and the detection is convenient and fast. In addition, the whole vehicle Y capacitor is simply, quickly and accurately detected, and the whole vehicle EMC is more conveniently tested and rectified, so that the whole vehicle EMC performance and the safety of drivers and passengers are improved.
The following describes the detection of the Y capacitance (i.e., the first Y capacitance) of the high-voltage dc negative electrode with respect to the vehicle body ground by the Y capacitance detection device 5 in detail.
The control unit 2 is further configured to control the actuation of the negative contactor of the power battery and send a first detection instruction to the Y capacitance detection device 5 when the Y capacitance detection device 5 is powered on and detection is not started (i.e., the Y capacitance detection device 5 detects one of the first Y capacitance, the second Y capacitance, and the third Y capacitance each time).
Y capacitance detection means 5 operable to detect the first Y capacitance by: after receiving the first detection instruction, applying alternating current (for example, alternating current of 1kHZ or 500V) with the preset frequency and the preset voltage value between the high-voltage direct-current side negative electrode and the vehicle body ground, wherein the high-voltage direct-current side negative electrode and the vehicle body ground can be connected through the Y capacitance detection device 5, so that the purpose of applying alternating current between the high-voltage direct-current side negative electrode and the vehicle body ground is achieved; and detecting a first leakage current between the negative electrode of the high-voltage direct current side and the ground of the vehicle body, and determining a first Y capacitor according to the first leakage current, a preset frequency and a preset voltage. And then, stopping applying the alternating current with the preset frequency and the preset voltage value between the high-voltage direct current side negative electrode and the ground of the vehicle body.
For example, the Y capacitance detection device 5 may be configured to determine the first Y capacitance according to the first leakage current, the preset frequency and the preset voltage by the following equation (1):
wherein, C1A first Y capacitor; i is1Is a first leakage current; f is a preset frequency; u is a preset voltage.
The following describes the detection of the Y capacitance (i.e., the second Y capacitance) of the high-voltage dc positive electrode with respect to the vehicle body ground by the Y capacitance detection device 5 in detail.
The control unit 2 may also be adapted to: when the Y capacitance detection device 5 is powered on and detection is not started, controlling the actuation of a positive contactor of the power battery, and controlling the actuation of contactors of various high-voltage components (such as a driving controller, an air conditioner, a step-down DC, an air compressor controller and the like); the second detection instruction is sent to the Y capacitance detecting device 5.
The control unit 2 may sequentially control the contactors of the high-voltage components to be actuated according to a first preset time interval (e.g., 0.5s), or may control the high-voltage components to be actuated simultaneously. Preferably, the contactors of each high-voltage component are controlled to be closed sequentially according to a first preset time interval, so that faults can be monitored in the process.
For example, when the Y capacitance detection device 5 is powered on and detection is not started, the control unit 2 first controls the main contactor of the driving controller to pull in; after 0.5, controlling the direct current side contactor of the air conditioner to suck; after 0.5, controlling a DC contactor of the step-down DC to pull in; after 0.5, controlling the direct-current side contactor of the air compressor controller to suck; then, a second detection instruction is sent to the Y capacitance detection device 5.
The Y capacitance detection device 5 may be configured to detect the second Y capacitance by: after receiving the second detection instruction, applying an alternating current (for example, an alternating current of 1kHZ or 500V) between the high-voltage direct-current positive electrode and the vehicle body ground, wherein the high-voltage direct-current positive electrode and the vehicle body ground can be connected by the Y capacitance detection device 5, so as to apply the alternating current between the high-voltage direct-current positive electrode and the vehicle body ground; and detecting a second leakage current between the positive electrode of the high-voltage direct current side and the ground of the vehicle body, and determining a second Y capacitor according to the second leakage current, the preset frequency and the preset voltage. And then, stopping applying the alternating current with the preset frequency and the preset voltage value between the high-voltage direct current side negative electrode and the ground of the vehicle body.
For example, the Y capacitance detecting device 5 may be configured to determine the second Y capacitance according to the second leakage current, the preset frequency and the preset voltage by the following equation (2):
wherein, C2A second Y capacitor; i is2Is the second leakage current.
The detection of the Y capacitance (i.e., the third Y capacitance) with respect to the vehicle body ground on the high-voltage ac side by the Y capacitance detection device 5 will be described in detail below.
The control unit 2 is further configured to send a third detection instruction to the Y capacitance detection device 5 when the Y capacitance detection device 5 is powered on and detection is not started.
Y capacitance detection means 5 for detecting the third Y capacitance by: after receiving the third detection instruction, applying alternating current (for example, alternating current of 1kHZ or 500V) between the three cross current sides of the high-voltage components (for example, the driving motor, the air compressor, the steering motor, the air conditioning compressor, and the like) and the vehicle body ground, wherein the three cross current sides of the high-voltage components and the vehicle body ground can be connected through the Y capacitance detection device 5, so as to apply alternating current between the three cross current sides of the high-voltage components and the vehicle body ground; and detecting a third leakage current between the high-voltage alternating current side and the vehicle body ground, and determining a third Y capacitor according to the third leakage current, a preset frequency and a preset voltage.
Here, the Y capacitance detecting device 5 may apply the alternating current between the three-phase current side of each high-voltage component and the vehicle body ground in sequence at a second preset time interval (for example, 0.5s), or may apply the alternating current between the three-phase current side of each high-voltage component and the vehicle body ground at the same time. Preferably, alternating current can be applied between the three cross-current sides of the high-voltage components and the vehicle body ground in sequence at second preset time intervals, so that faults can be monitored in the process.
For example, the Y capacitance detection device 5, upon receiving the third detection instruction, first applies an alternating current of 1kHZ, 500V between the three-phase current side of the steering motor and the vehicle body ground; after 0.5, applying alternating current of 1kHZ and 500V between the three-phase cross flow side of the air compressor and the ground of the vehicle body; after 0.5, applying alternating current of 1kHZ and 500V between the three-phase current-intersecting side of the driving motor and the ground of the vehicle body; after 0.5, applying alternating current of 1kHZ and 500V between the three-phase current side of the air-conditioning compressor and the ground of the vehicle body; and then, detecting a third leakage current between the high-voltage alternating current side and the ground of the vehicle body, and determining a third Y capacitor according to the third leakage current, a preset frequency and a preset voltage.
For example, the Y capacitance detecting device 5 may be configured to determine the third Y capacitance according to the third leakage current, the preset frequency and the preset voltage by the following equation (3):
wherein, C3A third Y capacitor; i is3Is the third leakage current.
In addition, to avoid feeding the low-voltage battery 1, the above-mentioned boost converter 3 may be used to: after receiving a start signal sent by the control unit 2 to instruct the start of the Y capacitance detection device 5, if the voltage of the low-voltage battery 1 is greater than a preset voltage threshold (for example, the rated voltage of the low-voltage battery 1 is 24V, and the preset voltage threshold is 20V), the low-voltage direct current of the low-voltage battery 1 is boosted to be the high-voltage direct current.
Specifically, the boost converter 3, upon receiving the start signal, first detects whether the voltage of the low-voltage battery 1 is greater than a preset voltage threshold. If the voltage of the low-voltage storage battery 1 is larger than a preset voltage threshold, the whole vehicle Y capacitor detection can be carried out to provide electric energy, namely the low-voltage direct current of the low-voltage storage battery 1 can be boosted into high-voltage direct current; if the voltage of the low-voltage storage battery 1 is less than or equal to the preset voltage threshold, the Y capacitance detection cannot be performed, and at this time, a warning message for prompting a user to charge the low-voltage storage battery 1 or replace a new low-voltage storage battery may be sent.
Fig. 4 is a flowchart illustrating a method for detecting Y capacitance of a vehicle according to an exemplary embodiment. As shown in fig. 4, the method may include the following steps 401 to 405.
In step 401, when the high-voltage system is powered on, if it is determined that both the positive contactor and the negative contactor of the power battery are in the off state, the control unit sends a start signal for instructing to start the Y capacitance detection device to the boost converter and the inverter, respectively.
In step 402, the boost converter boosts the low-voltage dc power of the low-voltage battery to a high-voltage dc power after receiving the start signal.
In step 403, the inverter inverts the high voltage dc into ac with a preset frequency and a preset voltage value after receiving the start signal, so as to supply power to the Y capacitance detecting device.
In step 404, the Y capacitance detecting device detects the first Y capacitance, the second Y capacitance, and the third Y capacitance in a time-sharing manner, and sends the first Y capacitance, the second Y capacitance, and the third Y capacitance to the control unit.
The first Y capacitor is a Y capacitor with a high-voltage direct-current side negative electrode facing the vehicle body ground, the second Y capacitor is a Y capacitor with a high-voltage direct-current side positive electrode facing the vehicle body ground, and the third Y capacitor is a Y capacitor with a high-voltage alternating-current side facing the vehicle body ground.
In step 405, the control unit determines the sum of the received first Y capacitor, second Y capacitor and third Y capacitor as the entire vehicle Y capacitor.
Optionally, the method further comprises: the control unit controls the negative contactor of the power battery to pull in and sends a first detection instruction to the Y capacitance detection device under the conditions that the Y capacitance detection device is powered on and detection is not started; the Y capacitance detection device detects the first Y capacitance by: after receiving the first detection instruction, applying alternating current between the high-voltage direct-current side negative electrode and the vehicle body ground; and detecting a first leakage current between the negative electrode of the high-voltage direct current side and the ground of the vehicle body, and determining a first Y capacitor according to the first leakage current, a preset frequency and a preset voltage.
Alternatively, the Y capacitance detecting device determines the first Y capacitance according to the first leakage current, the preset frequency, and the preset voltage by the following equation (1).
Optionally, the method further comprises: the control unit controls the positive contactor of the power battery to attract and controls the contactors of the high-voltage components to attract under the conditions that the Y capacitance detection device is powered on and detection is not started, and then sends a second detection instruction to the Y capacitance detection device;
the Y capacitance detecting device detects the second Y capacitance by: after receiving the second detection instruction, applying alternating current between the positive electrode on the high-voltage direct current side and the vehicle body ground; and detecting a second leakage current between the positive electrode of the high-voltage direct current side and the ground of the vehicle body, and determining a second Y capacitor according to the second leakage current, the preset frequency and the preset voltage.
Optionally, the method further comprises: the control unit sends a third detection instruction to the Y capacitance detection device when the Y capacitance detection device is powered on and detection is not started; the Y capacitance detecting device detects the third Y capacitance by: after receiving the third detection instruction, respectively applying alternating current between the three-phase current intersection side of each high-voltage component and the vehicle body ground; and detecting a third leakage current between the high-voltage alternating current side and the vehicle body ground, and determining a third Y capacitor according to the third leakage current, a preset frequency and a preset voltage.
Optionally, after receiving the start signal, the boost converter boosts the low-voltage dc power of the low-voltage battery into a high-voltage dc power, and includes: and after receiving the starting signal, if the voltage of the low-voltage storage battery is greater than a preset voltage threshold value, the boost converter boosts the low-voltage direct current of the low-voltage storage battery into high-voltage direct current.
Optionally, the boost converter is a boost DC-DC converter or a bidirectional DC-DC converter; and/or the inverter is a DC/AC inverter in the steering controller.
With regard to the method in the above-described embodiment, the specific manner in which each step performs the operation has been described in detail in the embodiment related to the system, and will not be elaborated upon here.
The present disclosure also provides a new energy vehicle, including: the whole vehicle Y capacitor detection system provided by the disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (8)
1. The utility model provides a whole car Y electric capacity detecting system which characterized in that includes:
a low-voltage battery (1), a control unit (2), a boost converter (3), an inverter (4), and a Y capacitance detection device (5);
the control unit (2) is respectively connected with the boost converter (3) and the inverter (4), and is used for sending starting signals for indicating to start the Y capacitance detection device (5) to the boost converter (3) and the inverter (4) if the positive contactor and the negative contactor of the power battery are determined to be in an off state when the high-voltage system is powered on;
the boost converter (3) is connected with the low-voltage storage battery (1) and is used for boosting the low-voltage direct current of the low-voltage storage battery (1) into high-voltage direct current after receiving the starting signal;
one end of the inverter (4) is connected with the boost converter (3), and the other end of the inverter is connected with the Y capacitance detection device (5), and the inverter is used for inverting the high-voltage direct current into alternating current with preset frequency and preset voltage value after receiving the starting signal so as to supply power to the Y capacitance detection device (5);
the Y capacitance detection device (5) is connected with the control unit (2) and is used for detecting a first Y capacitance, a second Y capacitance and a third Y capacitance in a time-sharing manner when different high-voltage loop contactors are attracted, and sending the first Y capacitance, the second Y capacitance and the third Y capacitance to the control unit (2), wherein the first Y capacitance is a Y capacitance of a high-voltage direct-current side negative electrode to a vehicle body ground, the second Y capacitance is a Y capacitance of a high-voltage direct-current side positive electrode to the vehicle body ground, and the third Y capacitance is a Y capacitance of a high-voltage alternating-current side to the vehicle body ground;
the control unit (2) is further configured to determine the sum of the received first Y capacitor, the received second Y capacitor and the received third Y capacitor as a finished vehicle Y capacitor;
the control unit (2) is further used for controlling the suction of a negative contactor of the power battery and sending a first detection instruction to the Y capacitance detection device (5) when the Y capacitance detection device (5) is powered on and detection is not started;
the Y capacitance detection device (5) is used for detecting the first Y capacitance by the following modes:
after the first detection instruction is received, applying the alternating current between the high-voltage direct-current side negative electrode and the vehicle body ground;
detecting a first leakage current between the high-voltage direct-current side negative electrode and the ground of the vehicle body, and determining the first Y capacitor according to the first leakage current, the preset frequency and the preset voltage through the following formula:
wherein, C1The first Y capacitor; i is1Is the first leakage current; f is the preset frequency; u is the voltage.
2. The system according to claim 1, wherein the control unit (2) is further configured to:
under the conditions that the Y capacitance detection device (5) is powered on and detection is not started, controlling the positive contactor of the power battery to attract, and controlling the contactors of the high-voltage components to attract;
sending a second detection instruction to the Y capacitance detection device (5);
the Y capacitance detection device (5) is used for detecting the second Y capacitance by the following modes:
after the second detection instruction is received, applying the alternating current between the high-voltage direct-current side positive electrode and the vehicle body ground;
and detecting a second leakage current between the positive electrode of the high-voltage direct current side and the ground of the vehicle body, and determining the second Y capacitor according to the second leakage current, the preset frequency and the preset voltage.
3. The system according to claim 1, wherein the control unit (2) is further configured to send a third detection instruction to the Y capacitance detection device (5) if the Y capacitance detection device (5) is powered and detection is not activated;
the Y capacitance detection device (5) is used for detecting the third Y capacitance by the following modes:
after receiving the third detection instruction, respectively applying the alternating current between three cross current sides of the high-voltage components and the ground of the vehicle body;
and detecting a third leakage current between the high-voltage alternating current side and the ground of the vehicle body, and determining the third Y capacitor according to the third leakage current, the preset frequency and the preset voltage.
4. A system according to any of claims 1-3, characterized in that the boost converter (3) is adapted to: and after the starting signal is received, if the voltage of the low-voltage storage battery (1) is greater than a preset voltage threshold, boosting the low-voltage direct current of the low-voltage storage battery (1) into high-voltage direct current.
5. A system according to any of claims 1-3, characterized in that the boost converter (3) is a boost DC-DC converter or a bi-directional DC-DC converter; and/or
The inverter (4) is a DC/AC inverter in a steering controller.
6. A method for detecting Y capacitance of a whole vehicle is characterized by comprising the following steps:
when a control unit is electrified in a high-voltage system, if the control unit determines that a positive contactor and a negative contactor of a power battery are both in a disconnected state, starting signals for indicating to start a Y capacitance detection device are respectively sent to a boost converter and an inverter;
after receiving the starting signal, the boost converter boosts the low-voltage direct current of the low-voltage storage battery into high-voltage direct current;
after receiving the starting signal, the inverter inverts the high-voltage direct current into alternating current with a preset frequency and a preset voltage value so as to supply power for the Y capacitance detection device;
the Y capacitance detection device detects a first Y capacitance, a second Y capacitance and a third Y capacitance in a time-sharing manner when different high-voltage loop contactors are in attraction, and sends the first Y capacitance, the second Y capacitance and the third Y capacitance to the control unit, wherein the first Y capacitance is a Y capacitance of a high-voltage direct-current side negative electrode to a vehicle body ground, the second Y capacitance is a Y capacitance of a high-voltage direct-current side positive electrode to the vehicle body ground, and the third Y capacitance is a Y capacitance of a high-voltage alternating-current side to the vehicle body ground;
the control unit determines the sum of the received first Y capacitor, the received second Y capacitor and the received third Y capacitor as a finished automobile Y capacitor;
the method further comprises the following steps:
the control unit controls a negative contactor of the power battery to pull in and sends a first detection instruction to the Y capacitance detection device under the conditions that the Y capacitance detection device is powered on and detection is not started;
the Y capacitance detection device detects the first Y capacitance by:
after the first detection instruction is received, applying alternating current between the high-voltage direct-current side negative electrode and the vehicle body ground;
detecting a first leakage current between the high-voltage direct-current side negative electrode and the ground of the vehicle body, and determining the first Y capacitor according to the first leakage current, the preset frequency and the preset voltage through the following formula:
wherein, C1The first Y capacitor; i is1Is the first leakage current; f is the preset frequency; u is the voltage.
7. The method of claim 6, wherein the boost converter boosts the low voltage DC power of the low voltage battery to a high voltage DC power after receiving the start signal, comprising:
and after receiving the starting signal, if the voltage of the low-voltage storage battery is greater than a preset voltage threshold value, the boost converter boosts the low-voltage direct current of the low-voltage storage battery into high-voltage direct current.
8. A new energy vehicle, characterized by comprising: the finished vehicle Y capacitance detection system according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010230619.7A CN113447720B (en) | 2020-03-27 | 2020-03-27 | Finished automobile Y-capacitor detection system and method and new energy vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010230619.7A CN113447720B (en) | 2020-03-27 | 2020-03-27 | Finished automobile Y-capacitor detection system and method and new energy vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113447720A CN113447720A (en) | 2021-09-28 |
| CN113447720B true CN113447720B (en) | 2022-05-13 |
Family
ID=77807893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010230619.7A Active CN113447720B (en) | 2020-03-27 | 2020-03-27 | Finished automobile Y-capacitor detection system and method and new energy vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113447720B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769966A (en) * | 2010-01-27 | 2010-07-07 | 广东电网公司电力科学研究院 | Method and device for measuring ground capacitance of DC system |
| CN104345217A (en) * | 2013-08-02 | 2015-02-11 | 艾默生网络能源有限公司 | Detection method and device for capacitance value |
| CN107238758A (en) * | 2017-05-08 | 2017-10-10 | 北京长城华冠汽车科技股份有限公司 | New-energy automobile high-pressure system Y capacitance detecting system, method and new-energy automobile |
| WO2017186393A1 (en) * | 2016-04-29 | 2017-11-02 | Robert Bosch Gmbh | Method and device for determining a capacitance of a dc link capacitor |
| CN207488408U (en) * | 2017-11-17 | 2018-06-12 | 常州市致新精密电子有限公司 | A kind of safety capacitance high-current test system |
| CN109342823A (en) * | 2018-09-29 | 2019-02-15 | 北京长城华冠汽车科技股份有限公司 | Measuring circuit, control method and the electric car of Y capacitance |
| CN109633283A (en) * | 2019-01-31 | 2019-04-16 | 厦门科华恒盛股份有限公司 | Bus capacitor capacitance monitoring method, device and terminal device |
| WO2019224177A1 (en) * | 2018-05-25 | 2019-11-28 | Autoliv Development Ab | Device for detecting the presence of an occupant inside the passenger compartment of a vehicle |
-
2020
- 2020-03-27 CN CN202010230619.7A patent/CN113447720B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769966A (en) * | 2010-01-27 | 2010-07-07 | 广东电网公司电力科学研究院 | Method and device for measuring ground capacitance of DC system |
| CN104345217A (en) * | 2013-08-02 | 2015-02-11 | 艾默生网络能源有限公司 | Detection method and device for capacitance value |
| WO2017186393A1 (en) * | 2016-04-29 | 2017-11-02 | Robert Bosch Gmbh | Method and device for determining a capacitance of a dc link capacitor |
| CN107238758A (en) * | 2017-05-08 | 2017-10-10 | 北京长城华冠汽车科技股份有限公司 | New-energy automobile high-pressure system Y capacitance detecting system, method and new-energy automobile |
| CN207488408U (en) * | 2017-11-17 | 2018-06-12 | 常州市致新精密电子有限公司 | A kind of safety capacitance high-current test system |
| WO2019224177A1 (en) * | 2018-05-25 | 2019-11-28 | Autoliv Development Ab | Device for detecting the presence of an occupant inside the passenger compartment of a vehicle |
| CN109342823A (en) * | 2018-09-29 | 2019-02-15 | 北京长城华冠汽车科技股份有限公司 | Measuring circuit, control method and the electric car of Y capacitance |
| CN109633283A (en) * | 2019-01-31 | 2019-04-16 | 厦门科华恒盛股份有限公司 | Bus capacitor capacitance monitoring method, device and terminal device |
Non-Patent Citations (2)
| Title |
|---|
| 《动力电池Y电容及其对整车漏电检测的影响》;梁丰收 等;《客车技术与研究》;20181213;全文 * |
| 《高压系统安规Y电容及寄生电容应用研究》;梁丰收 等;《汽车电器》;20190220;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113447720A (en) | 2021-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9002558B2 (en) | Abnormality diagnosis apparatus for power control system | |
| US7269535B2 (en) | Fault diagnosing apparatus for vehicle and fault diagnosing method for vehicle | |
| US9350179B2 (en) | Charging device | |
| US9551755B2 (en) | Relay weld diagnostic device | |
| US20110084704A1 (en) | Power supply device and method for making decision as to contactor weld of power supply device | |
| KR101664594B1 (en) | System and method for diagnosing insulation-breakdown of vehicel component | |
| KR101714243B1 (en) | Apparatus and method for diagonising current sensor of green car | |
| US9499063B2 (en) | Power-supply device | |
| CN108155828B (en) | Bidirectional low voltage DC to AC inverter | |
| JP2015019515A (en) | Discharge control device | |
| CN113799629A (en) | Apparatus and method for charging battery of vehicle | |
| JP2014017917A (en) | Onboard power supply system and inrush current suppression method therein | |
| JP2013225996A (en) | Abnormality diagnosis device for power supply control system | |
| JP6348456B2 (en) | Vehicle power supply system | |
| US11257644B2 (en) | Switch system | |
| JP2014119421A (en) | Electric leakage detector | |
| CN113447720B (en) | Finished automobile Y-capacitor detection system and method and new energy vehicle | |
| KR20170068714A (en) | Method for estimating charging time of echo-friendly vehicle | |
| US11372044B2 (en) | System and method for detecting fault of quick charge relay | |
| US20230256843A1 (en) | Method and device for charging an intermediate circuit capacitor in a high-voltage network | |
| KR20180128603A (en) | Method and apparatus for charging battery of electric motor vehicle | |
| JP5931833B2 (en) | Charging apparatus, vehicle charging system, charging method, and program | |
| US11435408B2 (en) | External power feed system and electric leak detection method therefor | |
| JP2012115018A (en) | Power controller | |
| CN115723604A (en) | Vehicle, energy conversion device and charging method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |