阅读说明：本技术 汽车制动灯控制方法及系统 (Automobile brake lamp control method and system ) 是由 周翔 孙长存 郑琦巍 王凯 郑乐锴 傅聪聪 于 2019-09-27 设计创作，主要内容包括：本发明提供一种汽车制动灯控制方法及系统,该方法包括步骤：接收制动踏板的下压信号,并当判断到下压信号满足制动条件时,控制常开开关闭合、常闭开关断开；当常开开关闭合时,向整车控制器发送闭合信号,并控制汽车制动继电器通电,以控制制动灯点亮；当常闭开关断开时,向整车控制器发送断开信号,并判断断开信号与闭合信号的信号状态是否相同；若否,发出开关故障提示。本发明制动信号产生由制动气管路变化为从踏板操纵机构上直接获取,通过在踏板上安装接触开关,以使根据常开开关闭合和常闭开关的开关状态变化,从而产生制动信号,进而缩短了阀体响应时间和气压建立所需的时间。(The invention provides a control method and a system for an automobile brake lamp, wherein the method comprises the following steps: receiving a pressing signal of a brake pedal, and controlling a normally open switch to be closed and a normally closed switch to be opened when the pressing signal is judged to meet the braking condition; when the normally-opened switch is closed, a closing signal is sent to the vehicle controller, and the vehicle brake relay is controlled to be electrified so as to control the brake lamp to be lightened; when the normally closed switch is disconnected, sending a disconnection signal to the vehicle controller, and judging whether the signal states of the disconnection signal and the closing signal are the same; if not, sending out a switch fault prompt. The brake signal generation of the invention is changed from the brake gas pipeline to be directly obtained from the pedal control mechanism, and the contact switch is arranged on the pedal, so that the switch states of the normally open switch and the normally closed switch are changed, thereby generating the brake signal and further shortening the response time of the valve body and the time required by the establishment of air pressure.)

1. The automobile brake lamp control method is used for controlling the display state of a brake lamp on an automobile, and is characterized in that a normally open switch and a normally closed switch which are connected in parallel are arranged between the brake lamp and a vehicle controller, and the normally open switch and the normally closed switch are both arranged on an automobile brake pedal, and the method comprises the following steps:

receiving a pressing signal of the brake pedal, and controlling the normally open switch to be closed and the normally closed switch to be opened when the pressing signal is judged to meet the braking condition;

when the normally-opened switch is closed, a closing signal is sent to the vehicle control unit, and an automobile brake relay is controlled to be electrified so as to control the brake lamp to be lightened;

when the normally closed switch is disconnected, sending a disconnection signal to the vehicle control unit, and judging whether the signal states of the disconnection signal and the closing signal are the same;

and when the signal states of the opening signal and the closing signal are not the same, sending out a switch fault prompt.

2. The control method of the brake light of the automobile according to claim 1, wherein the step of determining whether the signal states of the open signal and the close signal are the same comprises:

acquiring the open time of the open signal, acquiring the close time of the close signal, and calculating the time difference between the open time and the close time;

judging whether the time difference is within a preset time range or not;

if so, judging that the signal states of the opening signal and the closing signal are the same;

if not, the signal states of the opening signal and the closing signal are judged to be different.

3. The control method of a brake light of an automobile according to claim 2, wherein after the step of determining whether the time difference is within a preset time range, the method further comprises:

when the time difference is judged to be within the preset time range, accumulating and calculating a preset value to obtain an accumulated value;

when the time difference is judged not to be within the preset time range, resetting the accumulated value to zero;

and when the accumulated value is judged to be equal to a preset threshold value, sending out the switch fault prompt.

4. The automobile brake light control method according to claim 1, wherein after the step of receiving a depression signal of the brake pedal, the method further comprises:

judging whether the pressing signal is larger than a signal threshold value;

if yes, judging that the pressing signal meets the braking condition;

if not, the pressing signal is judged to not meet the braking condition.

5. The method for controlling a brake light of an automobile according to claim 1, further comprising:

acquiring an opening degree analog value of the brake pedal according to the pressing signal;

when the opening degree analog value is judged to be larger than or equal to the analog threshold value, judging whether the closing signal is received;

when the closing signal is judged not to be received, sending the switch fault prompt;

when the opening degree simulation value is judged to be smaller than the simulation threshold value, judging whether the normally open switch is in a disconnected state;

and when the normally open switch is judged to be in the off state, sending the switch fault prompt.

6. The utility model provides an automobile brake lamp control system for the display state of brake lamp on the control car, a serial communication port, be equipped with parallel connection's normally open switch and normally closed switch between brake lamp and the vehicle control unit, normally open switch with normally closed switch all sets up on automobile brake pedal, automobile brake lamp control system includes:

the switch control module is used for receiving a pressing signal of the brake pedal and controlling the normally open switch to be closed and the normally closed switch to be opened when the pressing signal is judged to meet the braking condition;

the power-on control module is used for sending a closing signal to the vehicle control unit when the normally-open switch is closed, and controlling the vehicle brake relay to be powered on so as to control the brake lamp to be lightened;

the state judgment module is used for sending a disconnection signal to the vehicle control unit when the normally closed switch is disconnected, and judging whether the signal states of the disconnection signal and the closing signal are the same;

and the first fault prompting module is used for sending out a switch fault prompt when the signal states of the opening signal and the closing signal are judged to be not the same.

7. The automotive brake light control system of claim 6, wherein the status determination module is further configured to:

acquiring the open time of the open signal, acquiring the close time of the close signal, and calculating the time difference between the open time and the close time;

judging whether the time difference is within a preset time range or not;

if so, judging that the signal states of the opening signal and the closing signal are the same;

if not, the signal states of the opening signal and the closing signal are judged to be different.

8. The automotive brake light control system of claim 7, wherein the status determination module is further configured to:

when the time difference is judged to be within the preset time range, accumulating and calculating a preset value to obtain an accumulated value;

when the time difference is judged not to be within the preset time range, resetting the accumulated value to zero;

and when the accumulated value is judged to be equal to a preset threshold value, sending out the switch fault prompt.

9. The automotive brake light control system of claim 6, wherein the switch control module is further configured to:

judging whether the pressing signal is larger than a signal threshold value;

if yes, judging that the pressing signal meets the braking condition;

if not, the pressing signal is judged to not meet the braking condition.

10. The automotive brake light control system of claim 6, further comprising:

the second fault prompting module is used for acquiring an opening degree analog value of the brake pedal according to the pressing signal;

when the opening degree analog value is judged to be larger than or equal to the analog threshold value, judging whether the closing signal is received;

when the closing signal is judged not to be received, sending the switch fault prompt;

when the opening degree simulation value is judged to be smaller than the simulation threshold value, judging whether the normally open switch is in a disconnected state;

and when the normally open switch is judged to be in the off state, sending the switch fault prompt.

Technical Field

The invention relates to the technical field of automobiles, in particular to an automobile brake lamp control method and system.

Background

With the continuous development of automobile industry in China, the automobile keeping amount is gradually increased year by year, and meanwhile, great pressure is brought to traffic safety. According to statistics, the number of traffic accidents in 2015 years in China is about 18.8 thousands, and the rear-end accidents account for 40.3 percent of the total number. The automobile safety technology is particularly emphasized in all countries in the world, and especially the research on rear-end collision prevention is more emphasized. In the running process of the vehicle, the rear vehicle owner keeps a safe vehicle distance by visually observing and deducing the braking force of the front vehicle and controlling a brake pedal of the rear vehicle owner according to whether the brake lamp of the front vehicle is on or not. Therefore, when the driver of the front vehicle depresses the brake pedal, it is important whether the brake light signal of the vehicle can be quickly and reliably turned on.

The brake lamp switch of the traditional scheme is in an air pressure opening mode, and the opening pressure is 0.05 Mpa. When the compressed air from the upper cavity of the master cylinder fills the air pressure of a pipeline between the master cylinder and the relay valve to be more than 0.05Mpa, a rear brake switch arranged on a rear axle brake control pipeline is triggered. When the compressed air from the lower cavity of the master cylinder fills the pipeline from the master cylinder to the front axle brake cylinder and the air pressure of the brake cylinder is more than 0.05Mpa, a front brake lamp switch arranged on the pipeline between the master cylinder and the front axle quick release valve is triggered.

In the existing automobile brake lamp control process, the source of an automobile brake signal is based on air pressure, and a certain time is needed from the step-on of a brake pedal to the filling of a cavity or pipeline gas at a brake lamp switch to 0.05 MPa. The time is related to the pipe diameter of the pipeline, the form of the pipe joint, the volume of the brake cylinder and the like. According to the test data, the brake signal obtained from the brake air pipeline may lag behind the action of the brake pedal by 0.2s under the normal condition, and the brake pedal is operated after the brake lamp of the front vehicle is turned on, so that the traditional scheme may increase the travel distance by 0.2s and bring a certain rear-end collision risk.

Disclosure of Invention

The embodiment of the invention aims to provide an automobile brake lamp control method and an automobile brake lamp control system which are quick in response and can send a brake signal to a driver of a rear automobile in advance so as to shorten the braking distance of the rear automobile.

In order to solve the technical problems, the automobile brake lamp control method provided by the invention is used for controlling the display state of a brake lamp on an automobile, a normally open switch and a normally closed switch which are connected in parallel are arranged between the brake lamp and a vehicle controller, and the normally open switch and the normally closed switch are both arranged on an automobile brake pedal, and the method comprises the following steps:

receiving a pressing signal of the brake pedal, and controlling the normally open switch to be closed and the normally closed switch to be opened when the pressing signal is judged to meet the braking condition;

when the normally-opened switch is closed, a closing signal is sent to the vehicle control unit, and an automobile brake relay is controlled to be electrified so as to control the brake lamp to be lightened;

when the normally closed switch is disconnected, sending a disconnection signal to the vehicle control unit, and judging whether the signal states of the disconnection signal and the closing signal are the same;

and when the signal states of the opening signal and the closing signal are not the same, sending out a switch fault prompt.

Preferably, the step of determining whether the signal states of the open signal and the close signal are the same includes:

acquiring the open time of the open signal, acquiring the close time of the close signal, and calculating the time difference between the open time and the close time;

judging whether the time difference is within a preset time range or not;

if so, judging that the signal states of the opening signal and the closing signal are the same;

if not, the signal states of the opening signal and the closing signal are judged to be different.

Preferably, after the step of determining whether the time difference is within a preset time range, the method further includes:

when the time difference is judged to be within the preset time range, accumulating and calculating a preset value to obtain an accumulated value;

when the time difference is judged not to be within the preset time range, resetting the accumulated value to zero;

and when the accumulated value is judged to be equal to a preset threshold value, sending out the switch fault prompt.

Preferably, after the step of receiving the depression signal of the brake pedal, the method further includes:

judging whether the pressing signal is larger than a signal threshold value;

if yes, judging that the pressing signal meets the braking condition;

if not, the pressing signal is judged to not meet the braking condition.

Preferably, the method further comprises:

acquiring an opening degree analog value of the brake pedal according to the pressing signal;

when the opening degree analog value is judged to be larger than or equal to the analog threshold value, judging whether the closing signal is received;

when the closing signal is judged not to be received, sending the switch fault prompt;

when the opening degree simulation value is judged to be smaller than the simulation threshold value, judging whether the normally open switch is in a disconnected state;

and when the normally open switch is judged to be in the off state, sending the switch fault prompt.

Compared with the related art, the automobile brake lamp control method provided by the invention has the following beneficial effects: the brake signal generation is changed from a brake gas pipeline to be directly obtained from a pedal control mechanism, and the contact switch is arranged on the pedal, so that the switch states of the normally open switch and the normally closed switch are changed, and the brake signal is generated.

Another object of an embodiment of the present invention is to provide an automobile brake light control system, configured to control a display state of a brake light on an automobile, where a normally open switch and a normally closed switch that are connected in parallel are disposed between the brake light and an automobile controller, and both the normally open switch and the normally closed switch are disposed on an automobile brake pedal, and the automobile brake light control system includes:

the switch control module is used for receiving a pressing signal of the brake pedal and controlling the normally open switch to be closed and the normally closed switch to be opened when the pressing signal is judged to meet the braking condition;

the power-on control module is used for sending a closing signal to the vehicle control unit when the normally-open switch is closed, and controlling the vehicle brake relay to be powered on so as to control the brake lamp to be lightened;

the state judgment module is used for sending a disconnection signal to the vehicle control unit when the normally closed switch is disconnected, and judging whether the signal states of the disconnection signal and the closing signal are the same;

and the first fault prompting module is used for sending out a switch fault prompt when the signal states of the opening signal and the closing signal are judged to be not the same.

Preferably, the state judgment module is further configured to:

acquiring the open time of the open signal, acquiring the close time of the close signal, and calculating the time difference between the open time and the close time;

judging whether the time difference is within a preset time range or not;

if so, judging that the signal states of the opening signal and the closing signal are the same;

if not, the signal states of the opening signal and the closing signal are judged to be different.

Preferably, the state judgment module is further configured to:

when the time difference is judged to be within the preset time range, accumulating and calculating a preset value to obtain an accumulated value;

when the time difference is judged not to be within the preset time range, resetting the accumulated value to zero;

and when the accumulated value is judged to be equal to a preset threshold value, sending out the switch fault prompt.

Preferably, the switch control module is further configured to:

judging whether the pressing signal is larger than a signal threshold value;

if yes, judging that the pressing signal meets the braking condition;

if not, the pressing signal is judged to not meet the braking condition.

Preferably, the automobile brake light control system further comprises:

the second fault prompting module is used for acquiring an opening degree analog value of the brake pedal according to the pressing signal;

when the opening degree analog value is judged to be larger than or equal to the analog threshold value, judging whether the closing signal is received;

when the closing signal is judged not to be received, sending the switch fault prompt;

when the opening degree simulation value is judged to be smaller than the simulation threshold value, judging whether the normally open switch is in a disconnected state;

and when the normally open switch is judged to be in the off state, sending the switch fault prompt.

Drawings

FIG. 1 is a schematic diagram of a conventional automobile brake light control;

fig. 2 is a schematic flow chart of a control method for a brake lamp of an automobile according to a first embodiment of the present invention;

FIG. 3 is a schematic diagram of signal transmission of a brake light of an automobile according to a first embodiment of the present invention;

fig. 4 is a schematic flow chart of a control method for a brake lamp of an automobile according to a second embodiment of the present invention;

fig. 5 is a schematic flow chart of a control method for a brake lamp of an automobile according to a third embodiment of the present invention;

FIG. 6 is a schematic diagram of signal transmission of a brake light of an automobile according to a third embodiment of the present invention;

fig. 7 is a schematic structural diagram of an automobile brake light control system according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a schematic diagram of a conventional automobile brake lamp control is shown, wherein the automobile brake lamp control includes a front axle brake cylinder 1, a front axle brake air cylinder 2, a rear axle brake air cylinder 3, a master brake cylinder 4, a rear axle brake light switch 5, a rear axle brake cylinder 6, a relay 7, a front axle brake switch 8, and a quick release valve or a relay valve 9, and specifically, the conventional automobile brake lamp control is in an air pressure opening mode, and the opening pressure is 0.05 Mpa. When the compressed air from the upper cavity of the master cylinder fills the air pressure of a pipeline between the master cylinder and the relay valve to be more than 0.05Mpa, a rear brake switch arranged on a rear axle brake control pipeline is triggered. When the compressed air from the lower chamber of the master cylinder fills the line from the master cylinder to the front axle brake cylinder and the brake cylinder pressure is above 0.05Mpa, the front brake light switch installed on the line between the master cylinder and the front axle quick release valve is triggered, thus resulting in a time lag analysis. The source of the brake signal of the traditional scheme is based on air pressure, and a certain time is needed from the step-on of the brake pedal to the filling of the cavity or pipeline gas to 0.05MPa at the switch position of the brake lamp. The time is related to the pipe diameter of the pipeline, the form of the pipe joint, the volume of the brake cylinder and the like. According to test data, a brake signal acquired from a brake air pipeline may lag behind the action of a brake pedal by 0.2s under a general condition, and a brake lamp of a front vehicle is generally turned on before a rear vehicle operates the brake pedal, so that the traditional scheme may increase the driving distance by 0.2s, and bring a certain rear-end collision risk, and the potential safety hazard of the existing automobile brake lamp in the control process is large. If the vehicle has a dangerous situation in front and needs emergency braking, the vehicle can not brake effectively and can not generate a brake lamp signal to warn the rear vehicle. Generally, a driver of a rear vehicle can move feet to a brake pedal to prepare braking after receiving a brake lamp signal of a front vehicle, and the rear vehicle which does not acquire the brake lamp signal of the front vehicle can not be aware of the situation until the front vehicle has collided and the like, so that the rear vehicle starts braking. It follows that in certain extreme cases, the generation of the braking signal has an adverse effect on the driving safety. Therefore, the invention aims to provide a control method and a control system for an automobile brake lamp, which have quick response and high reliability.