阅读说明：本技术 用于隔离开关控制器的检测电路、方法及故障诊断方法 (Detection circuit and method for isolating controller and fault diagnosis method ) 是由 郑嘉伟 雷元 钱涵 刘海翔 葛莹 陈至清 汤代胜 田丽伟 韩乐园 于 2021-09-23 设计创作，主要内容包括：本发明提出了一种用于隔离开关控制器的检测电路、方法及故障诊断方法,包括若干路,均安装在电路板上,并分别设置于第一MCU、降压式变换电路与若干组电流导通通路的一侧,所述检测电路均包括第二MCU,所述第二MCU的一侧连接有限流串联电阻,所述限流串联电阻远离所述第二MCU的一端分别安装有上拉电阻与NTC温度采样电阻,所述上拉电阻的一端连接有电源,所述NTC温度采样电阻的一端接地,本发明通过设置7路检测电路,来监测隔离开关控制器大电流区域和控制区的温度情况,以防控制器的温度超过电子元器件所能承受的最大工作温度；并且可以判断出温度传感器电路中的元器件故障,大大提高了隔离开关控制器的安全性能和故障覆盖率。(The invention has proposed a detection circuit, method and fault diagnosis method used for isolating the controller, including several ways, all mount on circuit board, and set up in first MCU, step-down converter circuit and one side of several groups of current conduction paths separately, the said detection circuit includes the second MCU, one side of the said second MCU connects with the current-limiting series resistance, one end far away from said second MCU of the said current-limiting series resistance is fitted with pull-up resistance and NTC temperature sampling resistor separately, one end of the said pull-up resistance connects with the power, one end of the said NTC temperature sampling resistor is grounded, the invention, through setting up 7 detection circuits, come to monitor the temperature situation of isolating the large-current area and control area of the controller, in order to prevent the temperature of the controller from exceeding the maximum working temperature that the electronic component can bear; and the faults of components in the temperature sensor circuit can be judged, and the safety performance and the fault coverage rate of the isolating controller are greatly improved.)

1. A detection circuitry for isolating switch controller, its characterized in that, isolating switch controller includes the circuit board, installs first MCU, step-down converter circuit and a plurality of group's electric current on the circuit board and switches on the route, detection circuitry includes a plurality of ways, all installs on the circuit board to set up respectively in one side of first MCU, step-down converter circuit and a plurality of group's electric current switch on route, detection circuitry all includes the second MCU, one side of second MCU is connected with current-limiting series resistance, current-limiting series resistance keeps away from pull-up resistance and NTC temperature sampling resistor are installed respectively to the one end of second MCU, the one end of pull-up resistance is connected with the power, NTC temperature sampling resistor's one end ground connection.

2. The detection circuit according to claim 1, wherein the detection circuit comprises 7 circuits, 1 circuit of the detection circuit is installed beside the first MCU and beside the buck converter circuit, and 5 circuits of the detection circuit are installed beside the current conducting path.

3. The detection circuit, method and fault diagnosis method for an isolation controller according to claim 2, characterized in that.

4. A method of testing a test circuit according to any one of claims 1 to 3, comprising the steps of:

collecting temperature values of a plurality of groups of detection circuits;

when the temperature value of more than one group of detection circuits exceeds 150 ℃, the isolation controller is switched off;

when the temperature of the detection circuit with the temperature value exceeding 150 ℃ is recovered to be below 120 ℃, the isolation controller is recovered.

5. The detection method according to claim 4, wherein the collecting temperature values of a plurality of groups of detection circuits specifically comprises:

the power supply outputs voltage to the second MCU, the resistance value of the NTC temperature sampling resistor changes when the environmental temperature changes, the NTC temperature sampling resistor and the pull-up resistor divide the voltage, and the second MCU obtains a corresponding temperature value according to the collected voltage value.

6. A method of diagnosing a malfunction of the detection circuit according to any one of claims 1 to 3, characterized by comprising the steps of:

collecting the temperature value of the (7-x) circuit detection circuit to obtain a sampling temperature value;

calibrating the compensation temperature difference value, and removing the maximum value and the minimum value of the sampling temperature value to obtain the temperature average value of the (7-x) circuit detection circuit;

judging the temperature abnormal condition of the (7-x) path detection circuit according to the sampling temperature value and the temperature average value of each path, and obtaining a corresponding fault type according to the temperature abnormal condition;

counting the number of the x-path detection circuits, and closing the isolation controller when x is greater than 3;

where x is the number of failed detection circuits.

7. The method according to claim 6, wherein the step of determining the abnormal temperature condition of the x-way detection circuit according to the sampled temperature value and the temperature average value and obtaining the corresponding fault type according to the abnormal temperature condition includes:

when the temperature sampling value of the detection circuit is less than minus 40 ℃, determining that the pull-up resistor of the detection circuit has open-circuit fault;

when the temperature sampling value of the detection circuit is more than 150 ℃, determining that the NTC temperature sampling resistor of the detection circuit has open circuit fault;

when the temperature sampling value of the detection circuit is an invalid value, judging that the series current-limiting resistor of the detection circuit has an open-circuit fault;

when the difference between the temperature sampling value of the detection circuit and the temperature average value is 10 ℃, the resistance drift fault of the NTC temperature sampling resistor of the detection circuit is judged.

Technical Field

One or more embodiments of the present disclosure relate to the field of automotive electronics, and in particular, to a detection circuit, a detection method, and a fault diagnosis method for an isolation controller.

Background

With the increasing sophistication and popularization of automatic driving, the whole vehicle also puts higher requirements on the safety of a power supply network for realizing the safety function in an automatic mode. In order to avoid accidents caused by the fact that a vehicle brake system cannot work normally when a power supply network fails, an isolating controller module of a power supply needs to be added to a whole vehicle power supply framework. The method provides necessary guarantee for the automatic driving part and the automobile safety part to still complete the functions according to the established design requirements under the condition of power supply network failure;

because of the environment temperature of placing isolating switch controller can be up to 85 degrees, and the electric current that isolating switch controller passed through is great, and the temperature rise of production is higher, but isolating switch controller arranges that the region is limited, can't add outside heat radiation equipment, consequently to the detection of controller temperature, excess temperature protection and temperature detection circuit's fault detection especially important.

Disclosure of Invention

In view of the above, an object of one or more embodiments of the present disclosure is to provide a detection circuit, a method and a fault diagnosis method for an isolation controller, which are used to solve one or all of the above problems.

Based on the detection circuitry for isolating switch controller that this one or more embodiments of this specification provided of above-mentioned purpose, isolating switch controller includes the circuit board, installs first MCU, step-down transform circuit and a plurality of group's electric current on the circuit board and switches on the route, detection circuitry includes a plurality of ways, all installs on the circuit board to set up respectively in one side of first MCU, step-down transform circuit and a plurality of group's electric current on-state route, detection circuitry all includes the second MCU, one side of second MCU is connected with current-limiting series resistance, current-limiting series resistance keeps away from pull-up resistance and NTC temperature sampling resistor are installed respectively to the one end of second MCU, pull-up resistance's one end is connected with the power, NTC temperature sampling resistor's one end ground connection.

Optionally, the detection circuit includes 7 circuits, 1 circuit is installed beside the first MCU and beside the buck converter circuit, and 5 circuits are installed beside the current conduction path.

According to the above embodiment, a detection method of a detection circuit is provided, which includes the following steps:

collecting temperature values of a plurality of groups of detection circuits;

when the temperature value of more than one group of detection circuits exceeds 150 ℃, the isolation controller is switched off;

when the temperature of the detection circuit with the temperature value exceeding 150 ℃ is recovered to be below 120 ℃, the isolation controller is recovered.

Optionally, the acquiring temperature values of a plurality of groups of detection circuits specifically includes:

the power supply outputs voltage to the second MCU, the resistance value of the NTC temperature sampling resistor changes when the environmental temperature changes, the NTC temperature sampling resistor and the pull-up resistor divide the voltage, and the second MCU obtains a corresponding temperature value according to the collected voltage value.

According to the above embodiment, a method for detecting a fault of a detection circuit is provided, which includes the following steps:

collecting the temperature value of the (7-x) circuit detection circuit to obtain a sampling temperature value;

calibrating the compensation temperature difference value, and removing the maximum value and the minimum value of the sampling temperature value to obtain the temperature average value of the (7-x) circuit detection circuit;

judging the temperature abnormal condition of the x-path detection circuit according to the sampling temperature value and the temperature average value of each path, and obtaining a corresponding fault type according to the temperature abnormal condition;

counting the number of the x-path detection circuits, and closing the isolation controller when x is greater than 3;

where x is the number of failed detection circuits.

Optionally, the determining, according to the sampled temperature value and the temperature average value, a temperature abnormal condition of the x-way detection circuit, and obtaining a corresponding fault type according to the temperature abnormal condition specifically include:

when the temperature sampling value of the detection circuit is less than minus 40 ℃, determining that the pull-up resistor of the detection circuit has open-circuit fault;

when the temperature sampling value of the detection circuit is more than 150 ℃, determining that the NTC temperature sampling resistor of the detection circuit has open circuit fault;

when the temperature sampling value of the detection circuit is an invalid value, judging that the series current-limiting resistor of the detection circuit has an open-circuit fault;

when the difference between the temperature sampling value of the detection circuit and the temperature average value is 10 ℃, the resistance drift fault of the NTC temperature sampling resistor of the detection circuit is judged.

From the above, it can be seen that the detection circuit, the detection method and the fault diagnosis method for the isolation controller provided in one or more embodiments of the present disclosure can monitor the temperature conditions of the large current region and the control region of the isolation controller by providing 7 detection circuits, so as to prevent the temperature of the controller from exceeding the maximum working temperature that can be borne by the electronic component; and the faults of components in the temperature sensor circuit can be judged, and the safety performance and the fault coverage rate of the isolating controller are greatly improved.

Drawings

In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only one or more embodiments of the present specification, and that other drawings may be obtained by those skilled in the art without inventive effort from these drawings.

FIG. 1 is a schematic diagram of a detection circuit according to one or more embodiments of the present disclosure;

FIG. 2 is a schematic diagram of a mounting location of a detection circuit according to one or more embodiments of the present disclosure;

FIG. 3 is a schematic flow diagram of a detection method according to one or more embodiments of the present disclosure;

FIG. 4 is a schematic flow diagram of a fault diagnosis method in accordance with one or more embodiments of the present disclosure;

the temperature measuring circuit comprises a power supply 1, a pull-up resistor 2, an NTC temperature sampling resistor 3, a current-limiting series resistor 4, a second MCU5, a first MCU6, a buck conversion circuit 7 and a current conducting path 8.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, the present disclosure is further described in detail below with reference to specific embodiments.

It is to be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present specification should have the ordinary meaning as understood by those of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in one or more embodiments of the specification is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

One or more embodiments of the present specification provide a detection circuit for an isolation controller, where the isolation controller includes a circuit board, and a first MCU6, a buck converter circuit 7, and a plurality of sets of current conducting paths 8 are installed on the circuit board, the detection circuit includes a plurality of circuits, all installed on the circuit board, and respectively disposed on one sides of the first MCU6, the buck converter circuit 7, and the sets of current conducting paths 8, the detection circuit includes a second MCU5, one side of the second MCU5 is connected to a current-limiting series resistor 4, one end of the current-limiting series resistor 4, which is far away from the second MCU5, is respectively installed with a pull-up resistor 2 and an NTC temperature sampling resistor 3, one end of the pull-up resistor 2 is connected to a power supply 1, and one end of the NTC temperature sampling resistor 3 is grounded.

Wherein, NTC temperature sampling resistor 3 corresponds different resistance under the different temperatures, second MCU5 can obtain different voltage value after with pull-up resistance 2 partial pressure, and the resistance is linear relation with voltage value, and then can calculate corresponding temperature value, carry out temperature detection to isolator controller easily heating's region through NTC temperature sampling resistor 3, be convenient for carry out temperature control to isolator controller, ensure that the inside electronic components of controller can work in normal operating temperature scope, current-limiting series resistance 4 is used for limiting the electric current size that flows into second MCU5, prevent that the current of pouring is too big, damage second MCU 5.

In one embodiment, the detection circuit includes 7 paths, 1 path of the detection circuit is installed near the first MCU6 and near the buck converter circuit 7, and 5 paths of the detection circuit are installed near the current conducting path 8. The current conducting path 8 is formed by connecting a plurality of groups of MOSFETs in series and then in parallel, and the temperature rise of the area caused by the large current is the highest position in the controller, so a plurality of groups of detection circuits need to be placed near the MOSFETs to monitor the temperature condition of the large current area.

According to the above embodiment, a detection method of a detection circuit is provided, which includes the following steps:

collecting temperature values of a plurality of groups of detection circuits; in this embodiment, in order to acquire the temperature value of the 7-way detection circuit, the specific mode is that the power supply 1 outputs voltage to the second MCU5, the resistance value of the NTC temperature sampling resistor 3 changes when the environmental temperature changes, the NTC temperature sampling resistor 3 and the pull-up resistor 2 divide the voltage, the second MCU5 obtains a corresponding temperature value according to the acquired voltage value, and the power supply 1 is the VDD5V power supply 1;

when the temperature value of more than one group of detection circuits exceeds 150 ℃, the isolation controller is disconnected, and the detection circuits continue to sample and monitor the temperature of the controller;

when the temperature of the detection circuit with the temperature value exceeding 150 ℃ is recovered to be below 120 ℃, the isolation controller is recovered.

By the detection method, the isolating controller can be timely disconnected when the internal temperature of the controller exceeds 150 ℃, so that electronic components in the controller can work within the normal working temperature range, and the correctness of the internal control logic of the isolating controller is ensured.

According to the above embodiment, a method for detecting a fault of a detection circuit is provided, which includes the following steps:

collecting the temperature value of the (7-x) circuit detection circuit to obtain a sampling temperature value;

calibrating the compensation temperature difference value, and removing the maximum value and the minimum value of the sampling temperature value to obtain the temperature average value of the (7-x) circuit detection circuit; because the temperatures of the first MCU6, the buck converter circuit 7 and the plurality of sets of current conducting paths 8 are different, the temperature difference value needs to be compensated according to the calibration result;

judging the temperature abnormal condition of the x-path detection circuit according to the sampling temperature value and the temperature average value, and obtaining a corresponding fault type according to the temperature abnormal condition;

counting the number of the x-path detection circuits, and closing the isolation controller when x is greater than 3;

where x is the number of failed detection circuits.

Optionally, the determining, according to the sampled temperature value and the temperature average value, a temperature abnormal condition of the x-way detection circuit, and obtaining a corresponding fault type according to the temperature abnormal condition specifically include:

when the temperature sampling value of the detection circuit is less than minus 40 ℃, the pull-up resistor 2 of the detection circuit is judged to have open-circuit fault;

when the temperature sampling value of the detection circuit is more than 150 ℃, the NTC temperature sampling resistor 3 of the detection circuit is judged to have open circuit fault;

when the temperature sampling value of the detection circuit is an invalid value, judging that the series current-limiting resistor of the detection circuit has an open-circuit fault;

when the difference between the temperature sampling value of the detection circuit and the temperature average value is 10 ℃, the resistance drift fault of the NTC temperature sampling resistor 3 of the detection circuit is judged.

By the fault diagnosis method, which one of the 7 temperature detection circuits fails can be judged, which electronic component in the detection circuit fails can be judged, the fault coverage rate of the isolating controller is greatly improved, and if three temperature detection circuits fail, the isolating controller needs to be closed, so that a passenger can replace the management switch controller, and danger caused by overhigh temperature is avoided.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the spirit of the present disclosure, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present description as described above, which are not provided in detail for the sake of brevity.

It is intended that the one or more embodiments of the present specification embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of one or more embodiments of the present disclosure are intended to be included within the scope of the present disclosure.