Brake lamp control system and control method

Abstract

The invention provides a brake lamp control system and method, and belongs to the technical field of brake lamp control, the brake lamp control system comprises a brake switch, a main control module, a brake lamp control module, a brake lamp, a position lamp switch and a position lamp, the brake switch is connected with the input end of the main control module, and the brake switch is connected with the input end of the brake lamp control module; the output end of the brake lamp control module is connected with the brake lamp, the output end of the main control module is connected with the input end of the position lamp switch, the position lamp switch is connected with the position lamp, and the brake lamp control module comprises a microcontroller and a driving chip. The brake switch is closed after a driver steps on the brake pedal, and the main control module and the brake lamp control module detect a high-level signal generated after the brake switch is closed. The main control module controls an automobile to slow down after detecting a high level signal, and the brake lamp control module controls a brake lamp to be turned on after detecting the high level signal. According to the method, vehicle braking faults are reduced, and vehicle safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of brake light control, and in particular, relates to a brake light control system and a control method. Background Art

[0002] With the rapid development of new energy vehicles, customers are increasingly demanding cost and safety considerations. The normal control logic of most new energy vehicles is as follows: when the brake pedal is pressed, a circuit breaker in the brake switch closes, sending a high-level power supply to the brake lights and the VCU controller. The brake lights illuminate, and the VCU controller decelerates. The VCU controller's brake signal reception circuit is interconnected with the brake light control circuit. However, if the taillight position light burns out and the position light's halogen filament comes into contact with the brake light's filament, turning on the position light, the VCU controller mistakenly receives a high-level brake signal, causing the vehicle to decelerate or limit speed.

[0003] Chinese patent 118645412A discloses a protective device for a brake light switch. Brake light switch PIN1 and brake light switch PIN3 form a main brake circuit. The brake light switch PIN1 is connected to the vehicle KL30, and the brake light switch PIN3 is connected to the brake light L1 and the EMS controller. Brake light switch PIN2 and brake light switch PIN4 form an auxiliary circuit. The brake light switch PIN2 is connected to the vehicle KL15, and the brake light switch PIN4 is connected to the EMS controller and the ESP controller. The device has a contact structure suitable for large loads and a sliding structure suitable for signal loads.

[0004] The existing technology does not solve the problem of erroneous collection of brake signals, which will affect the braking safety of the vehicle. Summary of the Invention

[0005] The present invention aims to provide a brake light control system and control method to achieve the technical purpose of reducing vehicle braking failures and improving vehicle safety.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a brake light control system, in which the filaments of the brake light and the position light in a vehicle are arranged in the same lampshade, comprising a brake switch, a main control module, a brake light control module, a brake light, a position light switch and a position light, wherein the brake switch is connected to the input end of the main control module, the brake switch is connected to the input end of the brake light control module, the main control module is connected to the brake light control module, the output end of the brake light control module is connected to the brake light, the output end of the main control module is connected to the input end of the position light switch, and the position light switch is connected to the position light.

[0008] The brake switch outputs a brake signal to the main control module, the brake switch outputs a brake signal to the brake light control module, the brake light control module outputs power to the brake light, and the main control module outputs a control instruction to the position light switch.

[0009] There are two brake light switches.

[0010] The main control module adopts a vehicle controller.

[0011] The brake light control module includes a microcontroller and a driver chip.

[0012] An input end of the brake light control module is connected to ground via a first capacitor and a second capacitor in series, an input end of the brake light control module is grounded via a first resistor, and an input end of the brake light control module is grounded via a second resistor. An input end of the brake light control module is connected to one end of a third resistor, and the other end of the third resistor is respectively connected to a fourth resistor, a third capacitor, and an input end of a microcontroller, the other end of the fourth resistor is grounded, and the other end of the third capacitor is grounded. An output end of the microcontroller is connected to an input end of a driver chip via a fifth resistor, and an output end of the driver chip is respectively connected to a sixth resistor, a sixth capacitor, and an output end of the brake light control module, the other end of the sixth resistor is grounded, and the other end of the sixth capacitor is grounded.

[0013] The brake lights include a left brake light, a right brake light and a high-mount brake light.

[0014] The position lights include a left position light and a right position light. The filament of the left position light and the filament of the left brake light are arranged in the same lampshade. The filament of the right position light and the filament of the right brake light are arranged in the same lampshade.

[0015] The present invention provides a control method for a brake light control system:

[0016] Step 1: The brake switch is closed after the driver steps on the brake pedal, and the main control module and the brake light control module detect the high-level signal generated after the brake switch is closed.

[0017] Step 2: The main control module controls the car to slow down after detecting a high-level signal, and the brake light control module controls the brake light to light up after detecting a high-level signal.

[0018] When the position lamp is on, the brake lamp control module eliminates the reverse high-level power input through the sixth resistor when the filament of the position lamp contacts the filament of the brake lamp.

[0019] The technical effects of the present invention are:

[0020] (1) The present invention solves the problem of misjudgment of brake signals in the prior art and improves system reliability. In the prior art, the brake signal acquisition circuit of the main control module (VCU) is connected to the brake light control circuit. When the position light contacts the brake light filament, the reverse high level of the brake light control circuit will be misjudged by the main control module as a brake signal, causing abnormal braking of the vehicle. The present invention uses the brake light control module (BCM) through a microcontroller and a driver chip circuit. When the reverse high level generated by the filament contact is detected, the sixth resistor (R06) is used to eliminate the signal, thereby preventing reverse current from flowing into the brake signal acquisition circuit of the main control module.

[0021] (2) The present invention provides two brake switches. When the driver steps on the brake pedal, closing either switch generates a high-level signal. The main control module (VCU) and the brake light control module (BCM) simultaneously collect the signal. Even if one brake switch fails, the other can still transmit the brake signal normally, ensuring the stability of brake signal acquisition, meeting the redundant design requirements of the vehicle safety system, and reducing the risk of single-point failure.

[0022] (3) The filtering and voltage-dividing circuit design in the brake light control module of the present invention can eliminate high-frequency interference and transient noise in the power supply, ensure the purity of the input signal, guarantee the accurate transmission of the brake signal, and reduce false triggering caused by circuit noise.

[0023] (4) The present invention ensures that the brake lights are lit quickly and accurately when braking, while the position lights operate normally when visibility is low. The two do not interfere with each other, thereby improving driving safety.

[0024] (5) The main control module and the brake light control module in the present invention have a reasonable division of labor, which avoids excessive load on a single module, improves the system response speed and reliability, and facilitates modular maintenance and upgrades.

[0025] (6) The present invention improves the safety of vehicle driving, protects the rights and interests of customers, and reduces the probability of traffic accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] This manual includes the following drawings, which show the following contents:

[0027] Figure 1 This is a logical structure diagram of a brake light control system and control method of the present invention;

[0028] Figure 2 A diagram showing the working principle of a brake light control system and control method according to the present invention;

[0029] Figure 3 A schematic diagram of a brake light control system and control method according to the present invention;

[0030] Figure 4An internal circuit diagram of a brake light control module of a brake light control system and control method of the present invention;

[0031] Figure 1 The markings are: 1. Brake switch; 2. Main control module; 3. Brake light control module; 4. Brake light; 5. Position light switch; 6. Position light. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the specific implementation methods of the present invention through the description of the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate their implementation.

[0033] The present invention provides a brake light control system, in which the filaments of the brake light and the position light in a vehicle are arranged in the same lampshade, comprising a brake switch 1, a main control module 2, a brake light control module 3, a brake light 4, a position light switch 5 and a position light 6. The brake switch 1 is connected to the input end of the main control module 2, the brake switch 1 is connected to the input end of the brake light control module 3, the main control module 2 is connected to the brake light control module 3, the output end of the brake light control module 3 is connected to the brake light 4, the output end of the main control module 2 is connected to the input end of the position light switch, and the position light switch is connected to the position light.

[0034] The brake switch 1 outputs a brake signal to the main control module 2, the brake switch 1 outputs a brake signal to the brake light control module 3, the brake light control module 3 outputs power to the brake light 4, and the main control module 2 outputs a control instruction to the position light switch.

[0035] There are two brake light switches. The main control module 2 uses the vehicle controller. The brake light control module 3 includes a microcontroller and a driver chip.

[0036] The input end of the brake light control module 3 is connected to the ground in series through the first capacitor and the second capacitor, the input end of the brake light control module 3 is grounded through the first resistor, the input end of the brake light control module 3 is grounded through the second resistor, the input end of the brake light control module 3 is connected to one end of the third resistor, the other end of the third resistor is respectively connected to the fourth resistor, the third capacitor and the input end of the microcontroller, the other end of the fourth resistor is grounded, the other end of the third capacitor is grounded, the output end of the microcontroller is connected to the input end of the driver chip through the fifth resistor, the output end of the driver chip is respectively connected to the sixth resistor, the sixth capacitor and the output end of the brake light control module 3, the other end of the sixth resistor is grounded, and the other end of the sixth capacitor is grounded.

[0037] The brake lights 4 include a left brake light, a right brake light, and a high-mounted brake light. The position lights include a left position light and a right position light, the filaments of the left position light and the left brake light are arranged in the same lampshade, and the filaments of the right position light and the right brake light are arranged in the same lampshade.

[0038] The present invention provides a control method for a brake light control system:

[0039] Step 1: The brake switch 1 is closed after the driver steps on the brake pedal, and the main control module 2 and the brake light control module 3 detect the high-level signal generated after the brake switch 1 is closed.

[0040] Step 2: The main control module 2 controls the vehicle to decelerate after detecting a high-level signal, and the brake light control module 3 controls the brake light 4 to light up after detecting a high-level signal.

[0041] When the position lamp is on, the brake lamp control module 3 eliminates the reverse high-level power input through the sixth resistor when the filament of the position lamp contacts the filament of the brake lamp 4 .

[0042] A brake light control system according to the present invention is described in detail below.

[0043] Currently, the filaments of a vehicle's brake light 4 and position light are housed in the same lampshade. This can cause the filaments of the brake light 4 and position light to come into contact, leading to the vehicle falsely detecting a brake signal and causing a braking malfunction. A brake light control system according to the present invention includes a brake switch 1, a main control module 2, a brake light control module 3, a brake light 4, a position light switch, and a position light. Two brake switches 1 are provided, each for transmitting a brake signal to the main control module 2 and the brake light control module 3. When the driver depresses the brake pedal, one of the two brake switches 1 closes. After the brake switch 1 closes, it generates a high-level signal. The main control module 2 and the brake light control module 3 detect the high-level signal generated by the brake switch 1 and determine whether the driver has depressing the brake pedal.

[0044] The main control module 2 uses a vehicle controller (VCU) to detect the braking signal and control the vehicle to decelerate when the braking signal is detected. Figure 2 As shown, in the prior art, the brake signal acquisition circuit and brake light control circuit of the main control module 2 are interconnected. When the main control module 2 collects a reverse high-level signal generated by the brake light control circuit through the brake signal acquisition circuit, it can easily misjudge the collected brake signal. The main control module 2 also controls the vehicle's position lights. When the driver presses the position light button on the vehicle, a control signal is generated. The main control module 2 detects the control signal and controls the position light switch to turn the position lights on or off.

[0045] The brake light control module 3 uses a body controller (BCM), which includes a microcontroller and a driver chip. It controls the illumination of the brake lights 4 when a brake signal is detected and eliminates any negative high-level signals input by the brake lights 4, preventing misjudgment by the main control module 2 and causing abnormal braking. The microcontroller in this invention is the Jiefa AC7811QBGE, and the driver chip is the Infineon BTS7030-2EPA.

[0046] The brake lights 4 include a left brake light, a right brake light, and a high-mounted brake light. The position lights include a left position light and a right position light. The filaments of the left position light and the left brake light are housed in the same lampshade, while the filaments of the right position light and the right brake light are housed in the same lampshade. The left and right position lights of the present invention utilize halogen bulbs. When the halogen bulbs are energized, the filaments heat up, tungsten atoms evaporate, and then migrate toward the glass tube wall. When they approach the glass tube wall, the tungsten vapor cools to approximately 800°C and combines with the halogen atoms to form tungsten halide. The tungsten halide continues to migrate toward the center of the glass tube and returns to the oxidized filament. Since tungsten halide is a highly unstable compound, it decomposes into halogen vapor and tungsten upon exposure to heat. Tungsten is then deposited on the filament, compensating for the evaporated portion. This regeneration cycle significantly extends the filament's service life (almost four times that of an incandescent lamp) and allows the filament to operate at higher temperatures, resulting in higher brightness, a higher color temperature, and higher luminous efficiency. Halogen bulbs in cars are consumable parts and are generally warrantied for three months or 5,000 kilometers, whichever comes first. The typical vehicle lifecycle is 10 years or 500,000 kilometers. Halogen bulb burnout is normal during a vehicle's lifecycle.

[0047] The connection relationship of a brake light control system of the present invention is described in detail below.

[0048] One end of the two brake switches 1 is connected to the power supply, and the other end is connected to the input end of the vehicle controller. The other end of one of the brake switches 1 is connected to the input end of the brake light control module 3. The brake light control module 3 includes a microcontroller and a driver chip. The input end (PIN1) of the brake light control module 3 is connected to the ground in series through the first capacitor (C01) and the second capacitor (C02). The input end (PIN1) of the brake light control module 3 is grounded through the first resistor (R01). The input end (PIN1) of the brake light control module 3 is grounded through the second resistor (R02). The input end (PIN1) of the brake light control module 3 is connected to the third resistor (R03). The other end of the third resistor (R03) is connected to The fourth resistor (R04), the third capacitor (C03), and the input terminal of the microcontroller are connected, the other end of the fourth resistor (R04) is grounded, the other end of the third capacitor (C03) is grounded, the output terminal of the microcontroller is connected to the fifth resistor (R05), the other end of the fifth resistor (R05) is connected to the input terminal (IN1) of the driver chip, the pins 8, 9, and 10 of the driver chip are respectively connected to the sixth resistor (R06), the sixth capacitor (C06), and the output terminal (PIN2) of the brake light control module 3, the other end of the sixth resistor (R06) is grounded, and the other end of the sixth capacitor (C06) is grounded. The power input terminal of the driver chip is respectively connected to the power supply, the transient voltage suppressor diode (TVS21), and the fourth capacitor (C04), the other end of the transient voltage suppressor diode (TVS21) is grounded, and the other end of the fourth capacitor (C04) is grounded through the fifth capacitor (C05). The output terminal (PIN2) of the brake light control module 3 is connected to the left brake light, the right brake light, and the high-mounted brake light, respectively. The filaments of the left position light and the left brake light are arranged in the same lampshade, and the filaments of the right position light and the right brake light are arranged in the same lampshade. The output terminal of the vehicle controller is connected to the left position light and the right position light respectively through the position light switch. The capacitance value of the first capacitor (C01), the second capacitor (C02), and the sixth capacitor (C06) is 10nF, the capacitance value of the third capacitor (C03) is 1nF, the capacitance value of the fourth capacitor and the fifth capacitor (C05) is 100nF, the resistance value of the first resistor (R01) and the second resistor (R02) is 1.8kΩ, the resistance value of the third resistor and the fourth resistor (R04) is 100kΩ, the resistance value of the fifth resistor (R05) is 15kΩ, and the resistance value of the sixth resistor (R06) is 47kΩ. The transient voltage suppressor diode (TVS21) is SMCJ33CA.

[0049] The following describes in detail a control method for a brake light control system according to the present invention.

[0050] Brake switch 1 closes after the driver presses the brake pedal. The main control module 2 and brake light control module 3 detect the high level generated by the closing of brake switch 1. Specifically, the closing of brake switch 1 generates a 12V high-level signal. The main control module 2 and brake light control module 3 detect the high-level signal by detecting the high-level signal. The present invention has two brake switches 1. Closing either brake switch 1 generates a high-level signal. The main control module 2 detects the high-level signal input from either brake switch 1 as a brake signal. The two brake switches 1 ensure that the main control module 2 can stably receive brake signals, improving vehicle safety.

[0051] After detecting a brake signal, the main control module 2 controls vehicle deceleration. After detecting a brake signal, the brake light control module 3 controls brake light 4 to illuminate. Specifically, upon receiving the 12V high-level signal generated by the closure of the brake switch 1, the brake light control module 3 filters the signal through the first, second, and third capacitors. The signal is then divided and output to the input of the microcontroller via the first, second, and fourth resistors connected in parallel, and the third resistor connected in series. When the microcontroller detects a high level greater than 3.25V, it outputs a 5V high-level signal to the input of the driver chip via the fifth resistor. Upon receiving the high-level signal, the driver chip outputs a 12V power supply to brake light 4 via pins 8, 9, and 10, illuminating the brake light 4.

[0052] When the driver presses the position light button in a low visibility environment, the main control module 2 controls the position light to light up through the position light switch after receiving the control signal, and the brake light control module 3 eliminates the reverse high-level power input through the sixth resistor when the filament of the position light contacts the filament of the brake light 4.

[0053] The present invention addresses the issue of misjudgment of brake signals in the prior art, improving system reliability. In the prior art, the brake signal acquisition circuit of the main control module 2 is connected to the brake light control circuit. When the position light contacts the brake light filament, the reverse high level in the brake light control circuit may be misjudged by the main control module 2 as a brake signal, causing abnormal vehicle braking. The present invention utilizes a sixth resistor (R06) to eliminate the reverse high level generated by the filament contact detected by the brake light control module 3 through a microcontroller and driver chip circuit, thus preventing reverse current from flowing into the brake signal acquisition circuit of the main control module 2.

[0054] The present invention employs two brake switches 1. Closing either switch generates a high-level signal when the driver depresses the brake pedal. This signal is then simultaneously collected by the main control module 2 and the brake light control module 3. Even if one brake switch 1 fails, the other can still transmit the brake signal normally, ensuring stable brake signal collection. This meets the redundant design requirements of automotive safety systems and reduces the risk of single-point failures.

[0055] The filtering and voltage-dividing circuit design in the brake light control module 3 of the present invention can eliminate high-frequency interference and transient noise in the power supply, ensure the purity of the input signal, guarantee the accurate transmission of the brake signal, and reduce false triggering caused by circuit noise.

[0056] The present invention ensures that the brake light 4 is quickly and accurately lit when braking, while the position light works normally when visibility is low, and the two do not interfere with each other, thereby improving driving safety.

[0057] The main control module 2 and the brake light control module 3 in the present invention have a reasonable division of labor, which avoids excessive load on a single module, improves the system response speed and reliability, and facilitates modular maintenance and upgrades.

[0058] The present invention improves the safety of vehicle driving, protects the rights and interests of customers, and reduces the probability of traffic accidents.

[0059] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. A brake light control system, wherein the filaments of the brake light and the position light in a vehicle are arranged in the same lampshade, characterized in that: It includes a brake switch, a main control module, a brake light control module, a brake light, a position light switch and a position light, wherein the brake switch is connected to the input end of the main control module, the brake switch is connected to the input end of the brake light control module, the main control module is connected to the brake light control module, the output end of the brake light control module is connected to the brake light, the output end of the main control module is connected to the input end of the position light switch, and the position light switch is connected to the position light.

2. A brake light control system according to claim 1, characterized in that: The brake switch outputs a brake signal to the main control module, the brake switch outputs a brake signal to the brake light control module, the brake light control module outputs power to the brake light, and the main control module outputs a control instruction to the position light switch.

3. The brake light control system according to claim 1, wherein: There are two brake light switches.

4. The brake light control system according to claim 1, wherein: The main control module adopts a vehicle controller.

5. The brake light control system according to claim 1, characterized in that: The brake light control module includes a microcontroller and a driver chip.

6. A brake light control system according to claim 5, characterized in that: An input end of the brake light control module is connected to ground via a first capacitor and a second capacitor in series, an input end of the brake light control module is grounded via a first resistor, and an input end of the brake light control module is grounded via a second resistor. An input end of the brake light control module is connected to one end of a third resistor, and the other end of the third resistor is respectively connected to a fourth resistor, a third capacitor, and an input end of a microcontroller, the other end of the fourth resistor is grounded, and the other end of the third capacitor is grounded. An output end of the microcontroller is connected to an input end of a driver chip via a fifth resistor, and an output end of the driver chip is respectively connected to a sixth resistor, a sixth capacitor, and an output end of the brake light control module, the other end of the sixth resistor is grounded, and the other end of the sixth capacitor is grounded.

7. The brake light control system according to claim 1, characterized in that: The brake lights include a left brake light, a right brake light and a high-mount brake light.

8. The brake light control system according to claim 1, wherein: The position lights include a left position light and a right position light. The filament of the left position light and the filament of the left brake light are arranged in the same lampshade. The filament of the right position light and the filament of the right brake light are arranged in the same lampshade.

9. A control method for a brake light control system according to any one of claims 1 to 8, characterized in that: Step 1: The brake switch is closed after the driver steps on the brake pedal, and the main control module and the brake light control module detect the high level signal generated after the brake switch is closed; Step 2: The main control module controls the car to slow down after detecting a high-level signal, and the brake light control module controls the brake light to light up after detecting a high-level signal.

10. The control method of a brake light control system according to claim 9, characterized in that: When the position lamp is on, the brake lamp control module eliminates the reverse high-level power input through the sixth resistor when the filament of the position lamp contacts the filament of the brake lamp.

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