CN211308248U - A controller safety pre-charging system - Google Patents

Abstract

The utility model provides a safety pre-charging system for a controller, which comprises a pre-charging resistor, a pre-charging relay and a main relay to form a basic pre-charging circuit. Add the current sensor of the precharge circuit, the voltage sensor at the front and back ends of the precharge circuit, and the temperature sensor of the precharge resistance. The above sensors are connected to the vehicle controller. When the system performs pre-charging, the vehicle controller starts timing, collects the front-end voltage and back-end voltage of the pre-charging circuit at the same time, collects the temperature difference of the pre-charging resistor during the pre-charging process, collects the current signal, and collects the voltage difference and current within the specified time. The value and temperature rise value should meet the design value of the pre-charging program, and it is judged that the pre-charging is successful. The utility model realizes the intelligent control of the precharge process according to the loop current, the voltage, the temperature rise of the precharge resistance and the precharge time. Realize safe pre-charging.

Description

A controller safety pre-charging system

technical field

The utility model relates to the technical field of new energy vehicles, in particular to a controller safety precharging system.

Background technique

New energy vehicles are powered by high-voltage batteries, and voltage-stabilizing capacitors are generally designed on the control DC bus side, including motor controllers, fuel cell high-power DCDC, and auxiliary drive DCAC controllers. When this type of controller is connected to the high-voltage power supply, the stabilizing capacitor should be pre-charged, and the control principle of pre-charging basically adopts the method of pre-charging resistance throttling.

The control of most pre-charging systems is relatively simple. It only controls the on-off of the main relay or adds a pre-charging relay. The control logic only determines the voltage difference before and after pre-charging. If the value is less than a certain threshold, the pre-charging is completed. This kind of rough control is relatively simple, but if there are problems such as the predicted internal short circuit of the equipment and the reverse connection of the positive and negative busbars during production, it will directly cause the precharge circuit to burn out and damage the devices adjacent to the precharge circuit.

Utility model content

In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a controller safety pre-charging system, including: a power battery, a current sensor, a voltage sensor, a main relay, a pre-charging relay, a pre-charging resistor, a load terminal and a complete vehicle controller;

The positive terminal of the power battery is respectively connected with the first terminal of the voltage sensor, the first terminal of the main relay and the first terminal of the precharge relay through the current sensor;

The second end of the precharge relay is connected to the first end of the precharge resistor, and the second end of the precharge resistor and the second end of the main relay are respectively connected to the load end;

There is a temperature sensor on the load end;

The vehicle controller is respectively connected with the current sensor, the voltage sensor, the main relay, the precharge relay and the temperature sensor;

The vehicle controller obtains the current data of the system through the current sensor, obtains the voltage data of the system through the voltage sensor, obtains the temperature data of the system through the temperature sensor, and judges whether the obtained data is out of range; it also controls the main relay and precharge separately. relay action.

It should be further noted that, it also includes: a timer;

The timer is connected with the vehicle controller, and the vehicle controller obtains the timing duration through the timer.

It should be further noted that the timer includes: resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, capacitor C1, capacitor C2, timing chip U1, light-emitting diode LED and optoelectronic isolator;

One foot of timing chip U1, the first input end of the optoelectronic isolator and the second end of capacitor C1 are grounded respectively; the two feet of timing chip U1 are grounded through capacitor C2; the first end of capacitor C1 is respectively connected to the second end of resistor R3, and the sliding end of resistor R3, The two pins and six pins of the timing chip U1; the first end of the resistor R3 is connected to the seven pins of the timing chip U1 and the first end of the resistor R2 respectively; the second end of the resistor R2 is respectively connected to the first end of the resistor R4, the eight pins of the timing chip U1 and the power supply; the resistor The second end of R4 is connected to the three pins of the timing chip U1 and the first end of the resistor R5 respectively through the light-emitting diode LED; the second end of the resistor R5 is connected to the first input end of the opto-isolator; the output end of the opto-isolator is connected to the vehicle controller; The controller is also connected with the first end of the resistor R1 and the four pins of the timing chip U1; the second end of the resistor R1 is grounded.

It should be further noted that, it also includes: an input and output device;

The input and output device is connected with the vehicle controller, and the vehicle controller obtains the control instruction input by the user through the input and output device, and displays the current state information of the system through the input and output device.

It should be further noted that the vehicle controller obtains the temperature data of the system through the temperature sensor, and when the temperature value exceeds 185°C, it is judged as a system failure state.

It should be further noted that the vehicle controller obtains the temperature data of the system through the temperature sensor, and within a preset period of time, when the temperature rise value obtained by the temperature sensor exceeds 20°C, it is judged as a system failure state.

It should be further noted that the vehicle controller is connected to the current sensor, voltage sensor, main relay, pre-charge relay and temperature sensor through the CAN communication line;

The load end is provided with a stabilizing capacitor.

As can be seen from the above technical solutions, the utility model has the following advantages:

The system provided by the utility model comprises a pre-charging resistor, a pre-charging relay and a main relay to form a basic pre-charging circuit. Add the current sensor of the precharge circuit, the voltage sensor at the front and back ends of the precharge circuit, and the temperature sensor of the precharge resistance. The above sensors are connected to the vehicle controller. When the system performs pre-charging, the vehicle controller starts timing, and simultaneously collects the front-end voltage and back-end voltage of the pre-charging circuit, collects the temperature difference of the pre-charging resistor during the pre-charging process, collects the current signal, and collects the voltage difference and current within the specified time. The value and temperature rise value should meet the design value of the pre-charging program, and it is judged that the pre-charging is successful. The utility model realizes the intelligent control of the precharge process according to the loop current, the voltage, the temperature rise of the precharge resistance and the precharge time. Realize safe pre-charging.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the accompanying drawings required in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, which are very important in the art. For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the schematic diagram of the safety pre-charging system of the controller;

Figure 2 is a circuit diagram of the timer.

Description of drawings

In the picture: 1. Power battery, 2. Current sensor, 3. Voltage sensor, 4. Main relay, 5. Pre-charging relay, 6. Pre-charging resistor, 7. Stabilizing capacitor, 8. Temperature sensor, 9. Acquisition module , 11, timer, 13, photoelectric isolator.

Detailed ways

In order to make the purpose, features and advantages of the present utility model more obvious and understandable, the technical solutions in the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the specific embodiments. Obviously, the following description The embodiments described above are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments in this patent, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be employed. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the present invention.

The utility model provides a controller safety pre-charging system, as shown in Figure 1 and Figure 2, comprising: a power battery 1, a current sensor 2, a voltage sensor 3, a main relay 4, a pre-charging relay 5, and a pre-charging resistor 6 , the load terminal 7 and the vehicle controller 9;

The positive terminal of the power battery 1 is respectively connected to the first terminal of the voltage sensor 3, the first terminal of the main relay 4 and the first terminal of the pre-charging relay 5 through the current sensor 2; the second terminal of the pre-charging relay 5 is connected to the first terminal of the pre-charging resistor 6 , the second end of the pre-charging resistor 6 and the second end of the main relay 4 are respectively connected to the load end 7; the load end 7 is provided with a temperature sensor 8; the vehicle controller 9 is respectively connected to the current sensor 2, the voltage sensor 3, the main relay 4 , the precharge relay 5 and the temperature sensor 8 are connected; the vehicle controller 9 obtains the current data of the system through the current sensor, obtains the voltage data of the system through the voltage sensor, obtains the temperature data of the system through the temperature sensor, and determines the obtained data. Whether it is out of range; also control the action of main relay 4 and pre-charge relay 5 respectively.

In Figure 1, the dashed line is the load part, the dotted line is the low-voltage control and signal acquisition part, and the solid line is the high-voltage continuous part.

The vehicle controller 9 is a VCU vehicle controller. The vehicle controller 9 is connected to the current sensor 2, the voltage sensor 3, the main relay 4, the precharge relay 5 and the temperature sensor 8 through the CAN communication line; the load terminal 7 is provided with a voltage stabilizing capacitor.

The utility model also includes: an input and output device; the input and output device is connected with the vehicle controller 9, and the vehicle controller 9 obtains the control instructions input by the user through the input and output device, and displays the current state information of the system through the input and output device. The input and output device can be set in the cab, and can use a touch screen, a display screen and a combination of control keys and so on.

The utility model further includes: a timer 11 ; the timer 11 is connected with the vehicle controller 9 , and the vehicle controller 9 obtains the timing duration through the timer 11 .

The timer 11 includes: resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, capacitor C1, capacitor C2, timing chip U1, light-emitting diode LED and photoelectric isolator 13;

One foot of the timing chip U1, the first input end of the photoelectric isolator 13 and the second end of the capacitor C1 are grounded respectively; the two feet of the timing chip U1 are grounded through the capacitor C2; the first end of the capacitor C1 is respectively connected to the second end of the resistor R3, and the sliding end of the resistor R3 , two pins and six pins of timing chip U1; the first end of resistor R3 is connected to the seven pins of timing chip U1 and the first end of resistor R2 respectively; the second end of resistor R2 is connected to the first end of resistor R4, eight pins of timing chip U1 and the power supply; The second end of the resistor R4 is connected to the three pins of the timing chip U1 and the first end of the resistor R5 respectively through the light-emitting diode LED; the second end of the resistor R5 is connected to the first input end of the photoelectric isolator 13; the output end of the photoelectric isolator 13 is connected to the vehicle controller 9; the vehicle controller 9 is also connected with the first end of the resistor R1 and the four pins of the timing chip U1; the second end of the resistor R1 is grounded. The timing chip U1, R2, resistor R3, and capacitor C1 form an astable multivibrator block of the timer 11, and the oscillation frequency=1.443/(R2+resistor R3) and capacitor C1. The vehicle controller 9 is connected with the four pins of the timing chip U1, and can act as a switch for controlling the timing chip U1. The optoelectronic isolator 13 can filter signals and isolate clutter.

Based on the above-mentioned system, the present invention also provides a specific implementation manner, the pre-charging process: when the high-voltage system of the vehicle needs to be high-voltage, the vehicle controller 9 detects the current data of the current sensor 2, detects the voltage data of the voltage sensor 3, and detects the temperature. The data of the sensor 8, the above sensor data is within the range specified by the vehicle controller, the vehicle controller 9 judges that the precharge circuit is faultless, and starts to send the relay pull-in command to the precharge relay 5, and the vehicle controller 9 starts timing at the same time , Detect the voltage of the front end of the precharge circuit measured by the voltage sensor 3, that is, the voltage of the battery 1 and the back end voltage of the precharge circuit, that is, the voltage of the stabilizing capacitor 7, detect the current value of the current sensor 2, and detect the temperature rise value of the temperature sensor 8. During pre-charging, the current is charged by the power battery 1 to the voltage-stabilizing capacitor 7 through the current sensor 2, the pre-charging relay 5, and the pre-charging resistor 6. The current value measured by the current sensor 2 should be a descending RC curve, and the voltage sensor 3 The measured voltage value of the stabilizing capacitor 7 should be a rising curve. When the difference between the voltage at the front end of the precharge circuit, that is, the voltage of the battery 1 and the voltage at the back end of the precharge circuit, that is, the voltage of the stabilizing capacitor 7, is 10Vdc, and the back end voltage is more than 98% of the front end voltage, it is judged that the precharge is successful. When the vehicle controller 9 starts to send a relay pull-in command to the main relay 4, after 1 second, it sends a relay disconnection command to the pre-charge relay 5 to complete the pre-charge process.

Fault process: first, when the high-voltage system of the vehicle needs to be high-voltage, the vehicle controller 9 detects the current data of the current sensor 2, and if there is a current value, it is judged as a fault state; second, the voltage data of the voltage sensor 3 is detected. , if the voltage of the power battery 1 is 0 or less than the specified value, it is judged as a fault state; third, the data of the temperature sensor 8 is detected, if the temperature value exceeds 185 ° C, it is judged as a fault state; fourth, after the pre-charging process starts , within the specified time, if the current value measured by the current sensor 2 is a non-declining RC curve and maintains a large value, it is judged as a fault state; fifth, after the pre-charging process starts, within the specified time, If the voltage value of the voltage stabilization capacitor 7 measured by the voltage sensor 3 is not a rising curve, and the voltage value maintains a low value, it is judged as a fault state; sixth, after the pre-charging process starts, within a specified time, When the temperature rise value of the temperature sensor 8 exceeds 20° C., it is judged as a failure state. This solves the technical problem of safety control of the pre-charging circuit. When there is an internal short circuit in the precharged controller, or the positive and negative busbars are reversed when connecting the wiring harness to the controller, it will directly cause the precharge circuit to burn out and damage the devices adjacent to the precharge circuit.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The terms "first", "second", "third", "fourth", etc. in the description and claims of the present invention and the above drawings, if present, are used to distinguish similar objects and are not necessarily used for description. a particular order or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances so that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A controller safety pre-charging system, characterized in that, comprising: power battery (1), current sensor (2), voltage sensor (3), main relay (4), pre-charging relay (5), pre-charging Resistor (6), load terminal (7) and vehicle controller (9); The positive terminal of the power battery (1) is respectively connected with the first terminal of the voltage sensor (3), the first terminal of the main relay (4) and the first terminal of the precharge relay (5) through the current sensor (2); The second end of the precharge relay (5) is connected to the first end of the precharge resistor (6), and the second end of the precharge resistor (6) and the second end of the main relay (4) are respectively connected to the load end (7); A temperature sensor (8) is arranged on the load end (7); The vehicle controller (9) is respectively connected with the current sensor (2), the voltage sensor (3), the main relay (4), the pre-charging relay (5) and the temperature sensor (8); The vehicle controller (9) obtains the current data of the system through the current sensor, obtains the voltage data of the system through the voltage sensor, obtains the temperature data of the system through the temperature sensor, and judges whether the obtained data is out of range; and also controls the main relays respectively. (4) and the precharge relay (5) act. 2. The controller safety pre-charging system according to claim 1, characterized in that, Also includes: timer (11); The timer (11) is connected with the vehicle controller (9), and the vehicle controller (9) obtains the timing duration through the timer (11). 3. The controller safety pre-charging system according to claim 2, characterized in that, The timer (11) includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a timing chip U1, a light-emitting diode LED and an optoelectronic isolator (13); One foot of the timing chip U1, the first input end of the optoelectronic isolator (13) and the second end of the capacitor C1 are grounded respectively; the two feet of the timing chip U1 are grounded through the capacitor C2; the first end of the capacitor C1 is respectively connected to the second end of the resistor R3, the resistor R3 The sliding end is the second pin and the sixth pin of the timing chip U1; the first end of the resistor R3 is connected to the seventh pin of the timing chip U1 and the first end of the resistor R2 respectively; the second end of the resistor R2 is connected to the first end of the resistor R4, the eight pins of the timing chip U1 and power supply; the second end of the resistor R4 is connected to the three pins of the timing chip U1 and the first end of the resistor R5 respectively through the light-emitting diode LED; the second end of the resistor R5 is connected to the first input end of the photoelectric isolator (13); the photoelectric isolator (13) output The terminal is connected to the vehicle controller (9); the vehicle controller (9) is also connected to the first terminal of the resistor R1 and the four pins of the timing chip U1; the second terminal of the resistor R1 is grounded. 4. The controller safety pre-charging system according to claim 1 or 2, characterized in that, Also includes: input and output devices; The input and output device is connected with the vehicle controller (9), and the vehicle controller (9) obtains the control instruction input by the user through the input and output device, and displays the current state information of the system through the input and output device. 5. The controller safety pre-charging system according to claim 1 or 2, characterized in that, The vehicle controller (9) obtains the temperature data of the system through the temperature sensor, and when the temperature value exceeds 185° C., it is judged as a system failure state. 6. The controller safety pre-charging system according to claim 1 or 2, characterized in that, The vehicle controller (9) obtains the temperature data of the system through the temperature sensor, and within a preset time period, when the temperature rise value obtained by the temperature sensor exceeds 20° C., it is determined that the system is in a fault state. 7. The controller safety pre-charging system according to claim 1 or 2, characterized in that, The vehicle controller (9) is connected to the current sensor (2), the voltage sensor (3), the main relay (4), the pre-charging relay (5) and the temperature sensor (8) through the CAN communication line; The load end (7) is provided with a voltage stabilizing capacitor.

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