Vehicle body controller with steering lamp current detection circuit
By introducing a current detection circuit into the body controller, the short-circuit protection and wire-break flashing function of turn signal are solved, and the problems of easy damage and cost increase in the steering chip is reduced, and the use cost is expanded and the chip selection capability is expanded.
Patent Information
- Application Number
- CN202421410151.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-06-19
AI Technical Summary
In the prior art, the turn signal body controller lacks overcurrent protection, which leads to easy damage to the steering light chip, which increases maintenance and production costs, and it is difficult for domestic chips to realize related functions, resulting in an increase in costs.
Design a body controller with a turn signal current detection circuit, collects the load output current through the current detection circuit and feeds it back to the MCU control module to realize short circuit protection and wire breaking flash functions, including the MCU control module, high-side drive module and current detection circuit.
Effectively protecting the steering chip reduces the impact of current on it, reduces the risk of damage, reduces costs, and expands the selection capability of high-side driver chips, solving the problems of chip shortage and cost out of control.
Smart Images
Figure CN223194883U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of automobile switch control, and specifically refers to a vehicle body controller with a turn signal current detection circuit. Background Art
[0002] In the automotive industry, the precision control of motor vehicle turn signals is gaining increasing attention. Turn signals are crucial signaling devices that alert vehicles ahead and behind when turning or overtaking, and their performance directly impacts traffic safety. Consequently, the requirements for turn signal control precision are becoming increasingly stringent, including for flashing, fault indication, and overtaking indication. However, existing technologies for turn signal control often rely on dedicated chips to control the operation of the turn signals.
[0003] However, domestically produced chips have yet to achieve this type of functional breakthrough, leading to a rapid increase in chip purchase costs. This poses unprecedented risks for manufacturers, hindering the development of new products such as body modules and the supply of mass-produced products. Current turn signal controllers lack overcurrent protection for the turn signal chips, making excessive current from various causes susceptible to damage, resulting in high repair and production costs. Utility Model Content
[0004] In order to overcome the shortcomings of the existing technology, the present application provides a body controller with a turn signal current detection circuit. Through the current detection circuit, the load output current is collected and fed back to the MCU control module, thereby realizing short-circuit protection and broken wire fast flash function of the turn signal output circuit.
[0005] The utility model provides a vehicle body controller with a turn signal current detection circuit, the vehicle body controller comprising: an MCU control module, a high-side driver module, and a current detection circuit; the MCU control module is electrically connected to the high-side driver module and the current detection circuit, the current detection circuit is electrically connected to the MCU control module and the high-side driver module, and the high-side driver module is connected to the turn signal;
[0006] Among them, the MCU control module receives the input signal or feedback current signal of the turn signal and determines whether to maintain or change the control signal output state of the turn signal; the high-side driver module drives the turn signal according to the turn signal control signal output by the MCU control module; the current detection circuit detects the output current of the high-side driver module in real time and sends the feedback current signal to the MCU control module.
[0007] According to the vehicle body controller provided in the present application with a turn signal current detection circuit, the turn signal includes a left turn signal and a right turn signal, the left turn signal and the right turn signal are respectively connected to the high-side driver module, and the left turn signal and the right turn signal are independently driven by the high-side driver module.
[0008] According to the body controller with a turn signal current detection circuit provided by the present application, the body controller also includes an input signal acquisition circuit, which includes at least a left turn signal switch acquisition unit and a right turn signal switch acquisition unit. The left turn signal switch acquisition unit and the right turn signal switch acquisition unit are both connected to the MCU control module. The left turn signal switch acquisition unit and the right turn signal switch acquisition unit respectively collect the left turn signal input signal and the right turn signal input signal, and output them to the MCU control module.
[0009] According to the vehicle body controller with a turn signal current detection circuit provided by this application, the MCU control module includes a power supply unit, an IO interface unit, a single-chip microcomputer chip, and an AD acquisition unit;
[0010] The power supply unit provides a stable electrical level to the MCU control module, the IO interface unit is connected to the input signal acquisition circuit, the single-chip microcomputer chip is connected to the IO interface unit and the AD acquisition unit, and the AD acquisition unit is connected to the high-side driver module and the current detection circuit.
[0011] According to the vehicle body controller with a turn signal current detection circuit provided in this application, the high-side driver module includes a high-side driver chip, a first drive switch and a second drive switch; the high-side driver chip is connected to the first drive switch and the second drive switch, the first drive switch is connected to the left turn signal, and the second drive switch is connected to the right turn signal; the high-side driver chip receives the control signal of the MCU control module through the AD acquisition unit, and controls the first drive switch and the second drive switch to control the working states of the left turn signal and the right turn signal respectively.
[0012] According to the vehicle body controller with a turn signal current detection circuit provided by the present application, the first drive switch and the second drive switch are both NMOS switch tubes.
[0013] According to the vehicle body controller provided in this application with a turn signal current detection circuit, the current detection circuit includes a current detection chip and multiple resistors, the multiple resistors are connected to the current detection chip, and the current detection chip is connected to the output end of the high-side driver chip and the AD acquisition unit; the current detection chip detects the output current of the high-side driver chip, and outputs the detected feedback current signal to the MCU control module through the AD acquisition unit.
[0014] According to the vehicle body controller provided by the present application with a turn signal current detection circuit, in the current detection circuit, the output current of the high-side driver chip generates a voltage difference across the resistor and realizes I / V conversion, which is amplified by the current detection chip and then output to the MCU control module for logic processing.
[0015] According to the vehicle body controller provided in this application with a turn signal current detection circuit, the MCU control module performs logical judgment based on the feedback current signal of the current detection circuit. If the feedback current signal is less than a preset current value, the MCU control module controls the turn signal to perform double flash drive.
[0016] According to the vehicle body controller provided in the present application with a turn signal current detection circuit, the MCU control module performs logical judgment based on the feedback current signal of the current detection circuit. If the feedback current signal is greater than a preset current value or the feedback current signal short-circuits the high-side driver module, the MCU control module controls the turn signal to turn off.
[0017] The beneficial effects of the present utility model are as follows: the present application provides a vehicle body controller with a turn signal current detection circuit, comprising an MCU control module, a high-side driver module, and a current detection circuit. The current detection circuit collects the load output current of the high-side driver module and outputs the collected feedback current signal to the MCU control module. The MCU control module performs a logical judgment based on the feedback current signal to determine whether the feedback current signal is too large or too small or a short circuit has occurred, thereby realizing short-circuit protection and a broken wire flash function for the turn signal output circuit. The impact of the current in the circuit on the turn signal chip is greatly reduced, protecting the service life of the turn signal chip, effectively resolving the risks of chip shortages and cost runaway, and reducing the cost of use, thus having certain economic value. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.
[0019] Figure 1This is a structural diagram of a vehicle body controller with a turn signal current detection circuit provided in an embodiment of the present application.
[0020] Figure 2 This is a schematic diagram of the circuit structure of the single-chip microcomputer chip of the MCU control module provided in this embodiment.
[0021] Figure 3 This is a schematic diagram of the circuit structure of the high-side driver chip provided in this embodiment.
[0022] Figure 4 This is a schematic diagram of the circuit structure of the current detection chip in the current detection circuit provided by this embodiment. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.
[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.
[0025] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.
[0026] Conventional turn signal body controllers lack overcurrent protection for the turn signal chip, making it easy for excessive current to damage the turn signal chip due to various reasons, resulting in high repair or production costs. This embodiment of the present application provides a body controller with a turn signal current detection circuit. This current detection circuit collects the load output current and feeds it back to the MCU control module, thereby implementing short-circuit protection for the turn signal output circuit and a quick flash function in the event of a broken wire.
[0027] Figure 1 This is a structural diagram of a vehicle body controller with a turn signal current detection circuit provided in an embodiment of the present application.
[0028] like Figure 1 As shown, the body controller includes: an MCU control module, a high-side driver module and a current detection circuit; the MCU control module is electrically connected to the high-side driver module and the current detection circuit, the current detection circuit is electrically connected to the MCU control module and the high-side driver module, and the high-side driver module is connected to the turn signal; wherein, the MCU control module receives the input signal or feedback current signal of the turn signal and determines whether to maintain or change the control signal output state of the turn signal; the high-side driver module drives the turn signal according to the turn signal control signal output by the MCU control module; the current detection circuit detects the output current of the high-side driver module in real time and sends the feedback current signal to the MCU control module.
[0029] The turn signal includes a left turn signal and a right turn signal. The left turn signal and the right turn signal are respectively connected to the high-side driver module. The left turn signal and the right turn signal are independently driven by the high-side driver module.
[0030] Among them, the body controller also includes an input signal acquisition circuit, which includes at least a left turn signal switch acquisition unit and a right turn signal switch acquisition unit. The left turn signal switch acquisition unit and the right turn signal switch acquisition unit are both connected to the MCU control module. The left turn signal switch acquisition unit and the right turn signal switch acquisition unit respectively collect the left turn signal input signal and the right turn signal input signal, and output them to the MCU control module.
[0031] Specifically, in this embodiment, the MCU control module is the logic processing core of the entire vehicle body controller. It collects input signals from the left and right turn signals, performs logical processing, and outputs control signals for the left and right turn signals, controlling the left and right turn signals to perform corresponding operational displays. The MCU control module receives input signals from the left and right turn signals or the feedback current signal output by the current detection circuit, performs logical judgment, and determines whether to maintain or change the current output state of the turn signal control signal based on the relevant signals. The entire process of the MCU control module's logical judgment processing and control signal output forms a closed loop, thereby ensuring the safety and reliability of the vehicle body controller.
[0032] The high-side driver module drives the left and right turn signal loads. It can be composed of an N-channel power MOS transistor with a charge pump. High-side driver modules using N-channel power MOS transistors with a charge pump offer excellent driving capabilities and cost advantages. The high-side driver chip within the high-side driver module can be specifically selected based on the load power and load type of the left and right turn signals, including halogen lamps and LED lamps.
[0033] In the current detection circuit, the output current of the high-side driver chip generates a voltage difference across the resistor and realizes I / V conversion. After being amplified by the current detection chip, it is output to the MCU control module for logic processing.
[0034] Figure 2 This is a schematic diagram of the circuit structure of the single-chip microcomputer chip of the MCU control module provided in this embodiment.
[0035] like Figure 2As shown, in this embodiment, the MCU control module includes a power supply unit, an I / O interface unit, a single-chip microcomputer chip, and an AD acquisition unit. The power supply unit provides a stable voltage level to the MCU control module. The I / O interface unit is connected to the input signal acquisition circuit. The single-chip microcomputer chip is connected to the I / O interface unit and the AD acquisition unit. The AD acquisition unit is connected to the high-side driver module and the current detection circuit. At least one of the I / O interfaces in the I / O interface unit is connected to the left turn signal switch acquisition unit, which receives the on / off information of the left turn signal and outputs it to the single-chip microcomputer chip. At least one of the I / O interfaces in the I / O interface unit is connected to the right turn signal switch acquisition unit, which receives the on / off information of the right turn signal and outputs it to the single-chip microcomputer chip. At least one AD acquisition circuit in the AD acquisition unit is connected to the left turn signal via the high-side driver module, at least one AD acquisition circuit in the AD acquisition unit is connected to the right turn signal via the high-side driver module, and at least one AD acquisition circuit in the AD acquisition unit is connected to the current detection circuit.
[0036] Figure 3 This is a schematic diagram of the circuit structure of the high-side driver chip provided in this embodiment.
[0037] like Figure 3 As shown, the high-side driver module includes a high-side driver chip, a first driver switch, and a second driver switch. The high-side driver chip is connected to the first and second driver switches, with the first driver switch connected to the left turn signal and the second driver switch connected to the right turn signal. The high-side driver chip receives control signals from the MCU control module via the AD acquisition unit and controls the first and second driver switches to control the operating states of the left and right turn signals, respectively. Both the first and second driver switches are NMOS switches.
[0038] like Figure 3As shown, in the circuit of the high-side driver chip, pin 1 of the high-side driver chip is the IN port, which is connected to the left turn signal through a resistor R241; pin 2 of the high-side driver chip is the GND port, which is grounded; pin 3 of the high-side driver chip is the ST1 port, which is connected to the LM-ST1 port through a resistor R242; pin 4 of the high-side driver chip is the ST2 port, which is connected to the LM-ST2 port through a resistor R243; at the same time, resistors 244 and 245 One end after parallel connection is connected to +5V voltage, the other end of resistor 244 is connected to ST2 port, and the other end of resistor 245 is connected to ST1 port; pins 5, 6, 7, and 8 of the high-side driver chip are all OUT ports, the OUT port is connected to one end of capacitor C67, the other end of capacitor C67 is grounded, and the OUT port is also connected to the right turn signal; pin 0 of the high-side driver chip is the VBB port, the VBB port is connected to the BAT-M port, and is also connected to one end of capacitor C64, and the other end of capacitor C64 is grounded.
[0039] The current detection circuit includes a current detection chip and multiple resistors. The multiple resistors are connected to the current detection chip, which is connected to the output end of the high-side driver chip and the AD acquisition unit. The current detection chip detects the output current of the high-side driver chip and outputs the detected feedback current signal to the MCU control module through the AD acquisition unit. In the current detection circuit, the output current of the high-side driver chip generates a voltage difference across the resistors, achieving I / V conversion. The voltage is amplified by the current detection chip and then output to the MCU control module for logic processing.
[0040] Specifically, the current detection circuit primarily monitors the load current of the left and right turn signal output circuits, generates a feedback current signal based on the detected load current, and transmits it to the MCU control module for logic processing. In this embodiment, the current detection circuit has an accuracy of ±2.5%, a typical Iout / Vsense gain of 10,000uA / V, and the AD acquisition unit in the MCU control module effectively acquires data in the 0-5V range.
[0041] Figure 4 This is a schematic diagram of the circuit structure of the current detection chip in the current detection circuit provided by this embodiment.
[0042] like Figure 4As shown, pin 1 of the current detection chip is the Vsense- port, which is externally connected to other circuits; pin 2 of the current detection chip is the Vsense+ port, which is connected to the cathode of diode D37, and the anode of diode D37 is connected to pin 3 of the current detection chip; pin 3 of the current detection chip is the Iout port, which is also connected to resistor R255, and the other end of resistor R255 is connected to resistor R257 and resistor R256; pin 2 of the current detection chip is also connected to resistor R251 and resistor R254.
[0043] In this embodiment, the MCU control module performs a logical judgment based on the feedback current signal of the current detection circuit. If the feedback current signal is less than a preset current value, the MCU control module controls the turn signal to perform a double flash drive. The MCU control module performs a logical judgment based on the feedback current signal of the current detection circuit. If the feedback current signal is greater than a preset current value or the feedback current signal indicates that the high-side driver module is short-circuited, the MCU control module controls the turn signal to turn off.
[0044] Specifically, according to national standard GB4785, the turn signal flash frequency is 60-120 times per minute, and the turn signal must have a self-diagnostic function. In this embodiment, the MCU control module performs logical judgment based on the feedback current signal of the current detection circuit to implement the turn signal self-diagnosis function. The current detection circuit can realize the output of the left turn signal or the right turn signal by the MCU control module when the load of the left turn signal or the right turn signal experiences an overcurrent or circuit break. The current detection circuit can also realize the double flash function by the MCU control module to alert the driver when a filament in the left turn signal or the right turn signal breaks.
[0045] In this embodiment, the vehicle body controller includes an MCU control module, a high-side driver module, a current detection circuit, and an input signal acquisition circuit. When the MCU control module detects a valid signal from the input circuit of the input signal acquisition circuit, it controls the corresponding channel output of the high-side driver chip in the high-side driver module, and the NMOS tube inside the high-side driver chip is turned on, thereby lighting the turn signal. The current detection circuit detects the current in the output circuit in real time, and forms the feedback current signal, which is fed back to the MCU control module for logical processing. When the current detection circuit detects that the current in the output circuit is normal, the MCU control module controls the turn signal to flash normally. When the feedback current signal is less than a preset current value, the MCU control module controls the turn signal to perform a double flash drive. When the feedback current signal is greater than the preset current value or the feedback current signal is a short circuit of the high-side driver module, the MCU control module controls the turn signal to turn off.
[0046] The present application provides a vehicle body controller with a turn signal current detection circuit, comprising an MCU control module, a high-side driver module, and a current detection circuit. The current detection circuit collects the load output current of the high-side driver module and outputs the collected feedback current signal to the MCU control module. The MCU control module performs a logical judgment based on the feedback current signal to determine whether the feedback current signal is too large or too small, or whether a short circuit has occurred, thereby achieving short-circuit protection and a broken wire flash function for the turn signal output circuit. This greatly reduces the impact of the current in the circuit on the turn signal chip, protects the service life of the turn signal chip, effectively addresses the risks of chip shortages and cost runaway, and reduces the cost of use, thus possessing certain economic value.
[0047] The vehicle body controller provided by this application, which has a turn signal current detection circuit, not only expands the selection capabilities of high-side driver chips by newly providing a current detection circuit, but also effectively responds to market changes and chip shortage risks. Furthermore, compared to integrated solutions, where the supply price is high due to the monopoly of the final manufacturer, the cost of the missing chip components increases several times. For small-scale manufacturers facing difficulties in chip procurement, the advantages of using the vehicle body controller provided by this application are fully realized. Furthermore, this application can pass EMC testing and electrical performance verification through good design, ensuring product reliability.
[0048] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Finally, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or terminal device comprising the element.
[0049] The above is a detailed introduction to a body controller with a turn signal current detection circuit provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A vehicle body controller having a turn signal current detection circuit, characterized in that: The vehicle body controller includes: an MCU control module, a high-side driver module and a current detection circuit; the MCU control module is electrically connected to the high-side driver module and the current detection circuit, the current detection circuit is electrically connected to the MCU control module and the high-side driver module, and the high-side driver module is connected to the turn signal; Among them, the MCU control module receives the input signal or feedback current signal of the turn signal and determines whether to maintain or change the control signal output state of the turn signal; the high-side driver module drives the turn signal according to the turn signal control signal output by the MCU control module; the current detection circuit detects the output current of the high-side driver module in real time and sends the feedback current signal to the MCU control module.
2. The vehicle body controller having a turn signal current detection circuit according to claim 1, characterized in that: The turn signal includes a left turn signal and a right turn signal. The left turn signal and the right turn signal are respectively connected to the high-side driver module. The left turn signal and the right turn signal are independently driven by the high-side driver module.
3. The vehicle body controller having a turn signal current detection circuit according to claim 2, characterized in that: The vehicle body controller also includes an input signal acquisition circuit, which includes at least a left turn signal switch acquisition unit and a right turn signal switch acquisition unit. The left turn signal switch acquisition unit and the right turn signal switch acquisition unit are both connected to the MCU control module. The left turn signal switch acquisition unit and the right turn signal switch acquisition unit respectively collect the left turn signal input signal and the right turn signal input signal, and output them to the MCU control module.
4. The vehicle body controller having a turn signal current detection circuit according to claim 3, characterized in that: The MCU control module includes a power supply unit, an IO interface unit, a single-chip microcomputer chip and an AD acquisition unit; The power supply unit provides a stable electrical level to the MCU control module, the IO interface unit is connected to the input signal acquisition circuit, the single-chip microcomputer chip is connected to the IO interface unit and the AD acquisition unit, and the AD acquisition unit is connected to the high-side driver module and the current detection circuit.
5. The vehicle body controller having a turn signal current detection circuit according to claim 4, characterized in that: The high-side driver module includes a high-side driver chip, a first driver switch and a second driver switch; the high-side driver chip is connected to the first driver switch and the second driver switch, the first driver switch is connected to the left turn signal, and the second driver switch is connected to the right turn signal; the high-side driver chip receives the control signal of the MCU control module through the AD acquisition unit, and controls the first driver switch and the second driver switch to control the working status of the left turn signal and the right turn signal respectively.
6. The vehicle body controller having a turn signal current detection circuit according to claim 5, characterized in that: The first drive switch and the second drive switch are both NMOS switch tubes.
7. The vehicle body controller having a turn signal current detection circuit according to claim 5, characterized in that: The current detection circuit includes a current detection chip and a plurality of resistors, the plurality of resistors are connected to the current detection chip, and the current detection chip is connected to the output end of the high-side driver chip and the AD acquisition unit; The current detection chip detects the output current of the high-side driver chip, and outputs the detected feedback current signal to the MCU control module through the AD acquisition unit.
8. The vehicle body controller having a turn signal current detection circuit according to claim 7, wherein: In the current detection circuit, the output current of the high-side driver chip generates a voltage difference across the resistor and realizes I / V conversion. After being amplified by the current detection chip, it is output to the MCU control module for logic processing.
9. The vehicle body controller having a turn signal current detection circuit according to claim 8, characterized in that: The MCU control module performs a logical judgment based on the feedback current signal of the current detection circuit. If the feedback current signal is less than a preset current value, the MCU control module controls the turn signal to perform a double flash drive.
10. The vehicle body controller having a turn signal current detection circuit according to claim 9, wherein: The MCU control module performs a logical judgment based on the feedback current signal of the current detection circuit. If the feedback current signal is greater than a preset current value or the feedback current signal indicates that the high-side driver module is short-circuited, the MCU control module controls the turn signal to turn off.