Brake lamp control strategy for deceleration caused by kinetic energy recovery of new energy vehicle

Abstract

The invention provides a brake lamp control strategy for deceleration caused by kinetic energy recovery of a new energy vehicle. The brake lamp control strategy comprises a microcontroller (MCU), a vehicle speed sensor and a brake lamp control system. The MCU collects speed data in real time, calculates deceleration and judges whether a brake lamp is turned on or not. When the deceleration is larger than or equal to 0.1 G and the duration is larger than or equal to 0.5 second, the brake lamp is turned on; the brightness is 50% when the deceleration is less than or equal to 0.2 G, and the brightness is 100% when the deceleration is greater than 0.2 G. The brightness of the brake lamp can be dynamically controlled without stepping on a brake pedal, a rear vehicle is reminded in time, and the risk of rear-end collision accidents is reduced. The system is simple in structure, low in cost and suitable for the new energy automobile, and the driving safety and adaptability are improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle control technology, and more specifically to a brake light control strategy for a new energy vehicle that decelerates due to kinetic energy recovery. Background Art

[0002] New energy vehicles widely use motor drive technology and use kinetic energy recovery systems to recycle energy. During vehicle deceleration or braking, the kinetic energy recovery system uses the motor to generate electricity in reverse, converting the vehicle's kinetic energy into electrical energy and storing it in the battery. However, when the vehicle decelerates rapidly due to kinetic energy recovery, the traditional brake signal is not triggered and the brake lights cannot light up, making it difficult for the rear vehicle to promptly determine the deceleration status of the vehicle in front, increasing the risk of rear-end collisions.

[0003] However, the existing brake light control strategy has technical defects when facing deceleration caused by kinetic energy recovery and fails to fully adapt to the technical characteristics of new energy vehicles.

[0004] 1. Traditional brake lights rely on brake pedal signals

[0005] The existing brake lights are completely dependent on the driver stepping on the brake pedal to trigger the brake signal, and cannot respond to the rapid deceleration caused by kinetic energy recovery. This results in the brake lights not being able to light up when the brake pedal is not pressed but the vehicle decelerates significantly, increasing the risk of rear-end collisions.

[0006] 2. Unable to perceive vehicle deceleration in real time

[0007] Existing brake light control systems are usually based on brake switch signals and do not consider the need to trigger the lighting of the brake lights through deceleration calculations. They are unable to adapt to the special deceleration situations caused by the kinetic energy recovery system in new energy vehicles.

[0008] 3. Lack of brightness adjustment mechanism

[0009] Traditional brake lights generally only support a single brightness lighting mode and cannot adjust the brightness according to the magnitude of deceleration, resulting in insufficient warning effect during slight deceleration, and the warning effect cannot be fully exerted during rapid deceleration, resulting in a problem of insufficient adaptability.

[0010] 4. Risk of false triggering or missed triggering

[0011] Some existing technologies attempt to detect deceleration signals through changes in vehicle speed, but are easily affected by road conditions (such as bumps) or vehicle sliding, resulting in false triggering or missed triggering of the brake lights, and the system reliability is low.

[0012] 5. High cost and complexity

[0013] Some existing solutions use additional hardware sensors or complex detection systems, which not only increases the manufacturing cost of new energy vehicles, but also increases the complexity of system design and maintenance, limiting their widespread application.

[0014] The above defects show that the existing brake light control system is difficult to meet the safety requirements of new energy vehicles when decelerating due to kinetic energy recovery. An intelligent brake light control strategy based on deceleration and duration judgment is urgently needed to effectively solve this technical problem. Summary of the invention

[0015] In order to solve the above problems, the present invention provides a brake light control strategy for new energy vehicles, which triggers the brake lights to light up when the vehicle decelerates rapidly due to kinetic energy recovery. Even if the brake pedal is not pressed, it can alert the vehicles behind, thereby reducing the risk of rear-end collisions.

[0016] To achieve the above object, the present invention provides the following technical solutions, which mainly include:

[0017] A brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery includes a microcontroller (MCU), a vehicle speed sensor and a brake light control system. The microcontroller is used to receive vehicle speed information from the vehicle speed sensor, calculate the vehicle deceleration in real time, and determine whether to light the brake light according to the calculation result; when the deceleration reaches or exceeds a preset deceleration threshold and the duration exceeds a preset time threshold, the microcontroller sends a lighting signal to the brake light control system to light the brake light.

[0018] Preferably, the preset deceleration threshold is 0.1G (this value is adjustable), and the preset time threshold is 0.5 seconds.

[0019] Preferably, when the deceleration is lower than 0.2G (this value is adjustable), the brake light control system lights the brake lights to 50% of the maximum brightness; when the deceleration exceeds or equals 0.2G (this value is adjustable), the brake light control system lights the brake lights to the maximum brightness.

[0020] Preferably, the microcontroller receives vehicle speed information every 50 milliseconds and calculates the current deceleration to update in real time whether the brake light lighting condition is met.

[0021] Preferably, the brake light control system includes a brake light brightness adjustment module, which controls the brightness of the brake light according to a signal output by the microcontroller to adapt to different deceleration conditions.

[0022] Preferably, the brake light brightness adjustment module controls the change of the brake light brightness through a PWM signal, thereby achieving brake light brightness adjustment under different decelerations.

[0023] Preferably, the microcontroller is used to determine changes in deceleration during normal driving of the vehicle, and trigger the brake lights to light up when a deceleration threshold is reached even if the brake pedal is not depressed.

[0024] Preferably, the vehicle speed sensor is an acceleration sensor or a sensor that obtains real-time vehicle speed information through a motor control system.

[0025] Preferably, the brake light control strategy is applied to new energy vehicles with kinetic energy recovery function, so that the brake lights can be turned on in time when kinetic energy recovery causes deceleration to alert the vehicles behind.

[0026] Preferably, the brake light control strategy further includes a self-check module, which automatically detects the status of the microcontroller, the speed sensor and the brake light control system when the vehicle is started to ensure the normal operation of the system.

[0027] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Improve driving safety:

[0029] The present invention can trigger the brake lights to light up without pressing the brake pedal by monitoring the vehicle deceleration in real time, especially when the vehicle decelerates rapidly due to kinetic energy recovery, and can promptly alert the vehicle behind. This effectively makes up for the defects of the traditional brake light control strategy, avoids the misjudgment of the rear vehicle due to the failure to trigger the brake lights, thereby reducing the occurrence of rear-end collisions and significantly improving driving safety.

[0030] 2. Enhance system response sensitivity:

[0031] The microcontroller (MCU) is used to calculate the vehicle deceleration in real time and update the judgment conditions every 50 milliseconds. By combining the judgment logic of deceleration and duration, it can quickly respond to the vehicle's deceleration state and ensure that the brake lights are lit at the right time. This highly sensitive response mechanism can adapt to various complex driving scenarios and ensure the smoothness and safety of the driving experience.

[0032] 3. Dynamically adjust the brightness of the brake lights:

[0033] The present invention sets a two-level brightness adjustment mechanism according to the vehicle's deceleration: when the deceleration is small, the brake light is lit at 50% brightness to avoid excessive warning; when the deceleration is large, the brake light is lit at 100% brightness to provide an obvious brake signal. By dynamically adjusting the brightness, not only the adaptability of the brake light signal is improved, but also energy consumption can be reduced and the service life of the brake light can be extended.

[0034] 4. Adapt to the kinetic energy recovery scenario of new energy vehicles:

[0035] With the popularity of kinetic energy recovery systems for new energy vehicles, the present invention is fully adapted to this technical environment. The kinetic energy recovery system provides reverse motor resistance during deceleration. The present invention can accurately identify the deceleration situation caused by this, and can realize intelligent control of brake lights without adding additional hardware equipment, thereby improving the overall performance of new energy vehicles.

[0036] 5. High system stability and reliability:

[0037] The present invention designs a self-check module, which performs a comprehensive test on the microcontroller, speed sensor and brake light control system when the vehicle is started, ensuring that all components operate in normal working conditions. This function effectively prevents brake light failure caused by system failure, further enhances the stability and reliability of the system, and provides double protection for driving safety.

[0038] 6. Reduce the risk of rear-end collisions:

[0039] Traditional brake lights rely on brake pedal signals to light up, while the present invention triggers the brake lights to light up by judging the deceleration and duration when the brake pedal is not pressed, effectively reminding the following vehicles that the vehicle is decelerating rapidly, especially in high-speed driving or emergency deceleration scenarios, greatly reducing the risk of rear-end collisions caused by the following vehicles' inability to judge the deceleration status in time.

[0040] 7. The system design is simple and easy to integrate:

[0041] The control strategy of the present invention is implemented based on the existing microcontroller and vehicle speed sensor, without the need for additional hardware or complicated installation procedures, and can be directly integrated into the control system of existing new energy vehicles. This simple design not only reduces system costs, but also improves the convenience of installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0043] Figure 1 This is a schematic diagram of the strategy of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Example

[0046] System composition

[0047] This embodiment provides a brake light control system for a new energy vehicle decelerating due to kinetic energy recovery, including the following main components:

[0048] 1. Microcontroller (MCU): As the core control unit of the system, it is used to collect vehicle speed data in real time, calculate deceleration, and determine whether the brake lights need to be turned on based on the set logic.

[0049] 2. Vehicle speed sensor: used to monitor the vehicle's running speed in real time and transmit speed data to the microcontroller.

[0050] 3. Brake light control system: used to receive the lighting signal output by the microcontroller and control the brightness of the brake light.

[0051] 4. Power supply system: Provide stable power support for the control system and brake lights.

[0052] System operation logic

[0053] 1. Deceleration calculation

[0054] The MCU receives the current speed data provided by the vehicle speed sensor every 50 milliseconds and compares it with the speed data at the previous moment.

[0055] Deceleration calculation formula:

[0056]

[0057] Among them, v prev is the vehicle speed at the previous moment, v current is the current vehicle speed, and t is the time interval (50ms).

[0058] 2. Deceleration threshold judgment

[0059] When the calculated deceleration a ≥ 0.1G (the specific value can be adjusted according to vehicle performance) and the duration ≥ 0.5 seconds, the MCU determines that the deceleration condition is met and triggers the brake light lighting signal.

[0060] 3. Brake light brightness adjustment

[0061] If 0.1G≤deceleration<0.2G (the specific value can be adjusted according to vehicle performance), the brake lights will light up at 50% of the maximum brightness;

[0062] If the deceleration is ≥ 0.2G (the specific value can be adjusted according to the vehicle performance), the brake lights will light up at the maximum brightness of 100%;

[0063] The brightness of the brake light is controlled by a PWM signal, and the brightness is adjusted by the duty cycle.

[0064] 4. Signal transmission and brake light control

[0065] The MCU sends a lighting signal to the brake light control system, along with brightness information. The brake light control system lights up the brake lights and adjusts the brightness accordingly.

[0066] Specific implementation steps

[0067] 1. System initialization

[0068] When the vehicle is started, the system self-check module detects whether the MCU, speed sensor and brake light control system are in normal state. If the test passes, the system enters the standby state.

[0069] 2. Real-time speed acquisition and calculation

[0070] The MCU collects the current speed from the vehicle speed sensor in real time, records and stores the data every 50 milliseconds.

[0071] 3. Deceleration judgment

[0072] The MCU calculates the current deceleration and compares it with the set threshold:

[0073] If the deceleration is ≥0.1G (the specific value can be adjusted according to the vehicle performance) and the duration is ≥0.5 seconds, the brake light lighting condition is determined to be met;

[0074] If the deceleration is less than 0.1G (the specific value can be adjusted according to the vehicle performance) or the duration is less than 0.5 seconds, the brake lights will remain off.

[0075] 4. Brightness output

[0076] The MCU determines the brightness of the brake light according to the deceleration:

[0077] When 0.1G≤deceleration<0.2G (the specific value can be adjusted according to vehicle performance), the brake light will light up at 50% brightness;

[0078] When the deceleration is ≥0.2G (the specific value can be adjusted according to the vehicle performance), the brake lights will light up at 100% brightness.

[0079] The brake light brightness is output via a PWM signal with duty cycle settings of 50% and 100%.

[0080] 5. Output signal to drive brake lights

[0081] The MCU sends the lighting signal and brightness information to the brake light control system, drives the brake lights to light up, and continues to output signals until the deceleration is lower than the threshold or the vehicle stops decelerating.

[0082] Sample Data

[0083] 1. Case 1: Slight deceleration

[0084] Vehicle current speed: 40km / h, last speed: 42km / h, time interval: 50ms;

[0085] The calculated deceleration is:

[0086]

[0087] The deceleration is less than 0.1G and the brake lights are not on.

[0088] 2. Case 2: Moderate deceleration

[0089] Vehicle current speed: 60km / h, last speed: 64km / h, time interval: 50ms;

[0090] The calculated deceleration is:

[0091]

[0092] When the deceleration is ≥ 0.1G and the duration is > 0.5 seconds, the MCU determines that the brake light is on and the brightness is set to 100%.

[0093] 3. Case 3: Strong deceleration

[0094] Vehicle current speed: 80km / h, last speed: 90km / h, time interval: 50ms;

[0095] The calculated deceleration is:

[0096]

[0097] If the deceleration exceeds 0.2G, the brake lights will illuminate immediately to 100% of the maximum brightness.

[0098] System Advantages

[0099] The brake light control system of this embodiment can accurately trigger the brake light to light up and adjust the brightness in different situations of deceleration due to kinetic energy recovery, thereby improving driving safety and reducing the risk of rear-end collisions. The system has a simple structure and is easy to integrate, and can be widely used in new energy vehicles.

[0100] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0101] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery, characterized in that: It includes a microcontroller, a vehicle speed sensor and a brake light control system. The microcontroller is used to receive vehicle speed information from the vehicle speed sensor, calculate the vehicle deceleration in real time, and determine whether to light the brake lights according to the calculation results; when the deceleration reaches or exceeds a preset deceleration threshold and the duration exceeds a preset time threshold, the microcontroller sends a lighting signal to the brake light control system to light the brake lights.

2. The brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to claim 1, characterized in that: The preset deceleration threshold is 0.1G, and the preset time threshold is 0.5 seconds.

3. The brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to claim 2, characterized in that: When the deceleration is lower than 0.2G, the brake light control system lights up the brake light to 50% of the maximum brightness; when the deceleration exceeds or is equal to 0.2G, the brake light control system lights up the brake light to the maximum brightness.

4. A brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to any one of claims 1 to 3, characterized in that: The microcontroller receives vehicle speed information every 50 milliseconds and calculates the current deceleration to update in real time whether the brake light lighting condition is met.

5. A brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to any one of claims 1 to 4, characterized in that: The brake light control system includes a brake light brightness adjustment module, which controls the brightness of the brake light according to the signal output by the microcontroller to adapt to different deceleration conditions.

6. The brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to claim 5, characterized in that: The brake light brightness adjustment module controls the change of the brake light brightness through a PWM signal, thereby achieving brake light brightness adjustment under different decelerations.

7. A brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to any one of claims 1 to 6, characterized in that: The microcontroller is used to determine the change in deceleration during normal driving of the vehicle, and trigger the brake light to light up when the deceleration threshold is reached even if the brake pedal is not depressed.

8. A brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to any one of claims 1 to 7, characterized in that: The vehicle speed sensor is a sensor that obtains real-time vehicle speed information through a motor control system.

9. A brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to any one of claims 1 to 8, characterized in that: The brake light control strategy is applied to new energy vehicles with kinetic energy recovery function, so as to timely light up the brake lights when kinetic energy recovery causes deceleration to alert the vehicles behind.

10. A brake light control strategy for a new energy vehicle decelerating due to kinetic energy recovery according to any one of claims 1 to 9, characterized in that: The brake light control strategy also includes a self-check module, which automatically detects the status of the microcontroller, speed sensor and brake light control system when the vehicle is started to ensure the normal operation of the system.

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