KR102494788B1 - Priority braking system And its braking method for vehicles - Google Patents

Abstract

The present invention discloses a priority braking system for a vehicle and a braking method therefor.
Priority braking system of a vehicle according to the present invention is a priority braking system of a vehicle having a brake booster that is connected to a vacuum pump to generate negative pressure as an amplifying element that doubles the pedal force in conjunction with the brake pedal receiving the driver's pedal force, Start detection unit for detecting the position of the ignition switch and whether the engine is driven in LOCK-ACC-ON-START of the vehicle; A braking control unit that operates by receiving a detection signal from the start detection unit, detects vacuum pressure of the brake booster, compares it with a preset vacuum pressure value, and selectively applies a control signal for an on/off operation to the brake booster; It consists of a braking power supply unit supplying power to the braking control unit and the brake booster.
The priority braking system of the vehicle according to the present invention configured as described above allows the configuration of the braking system involved in the braking force of the vehicle to be operated independently, thereby ensuring effective and stable braking performance at all times regardless of whether the vehicle is running or not. Accordingly, there is a useful effect of preventing the possibility of a safety accident due to loss of braking force in advance and increasing reliability and stability of the braking performance of the vehicle.
In addition, by detecting the negative pressure of the booster that generates braking force and limiting engine starting according to the set value, it is possible to prevent the vehicle from starting in a state where the braking force is not guaranteed, and also to prevent the pressure change of the booster while driving the vehicle. There is an advantage in preventing the risk of an accident due to loss of braking force in advance by detecting in real time and controlling the pressure of the booster to automatically maintain it above the set value when it falls below the set value.
In addition, when the negative pressure of the brake boost that generates braking force drops below the set value as the engine output suddenly rises at high speed while the vehicle is driving, it determines whether there is an abnormality and guides the driver to recognize it, as well as fuel supplied to the engine. or cut off the power supplied to the engine, so that the engine operation can be stopped as a result, thereby increasing safety.
In addition, the present invention not only guarantees a stable braking force even in a situation where normal driving is impossible due to the ignition off phenomenon while driving, but also controls the steering wheel for steering the vehicle to operate normally, and the sudden steering wheel for avoiding danger. It is expected that the risk of safety accidents can be significantly reduced by controlling the ABS, which prevents wheel locking due to manipulation, to operate normally.

Description

Priority braking system and its braking method for vehicles

The present invention relates to a priority braking system for a vehicle and a braking method thereof, and more particularly, to ensure stable operation by independently configuring components related to braking of a vehicle regardless of an engine drive system, thereby ensuring a stable operation of the vehicle before departure. Alternatively, it is possible to ensure safe and reliable braking performance by preventing the braking force due to abnormal driving of the engine from being affected while driving and preventing loss of braking force due to poor performance of the braking system in advance. It relates to a priority braking system of a vehicle and a braking method therefor.

In general, a braking device used for the purpose of decelerating or stopping a vehicle in motion includes a brake pedal that receives a driver's operating force, a booster that is an amplification element that receives and multiplies the operating force of the brake pedal, and the booster. It consists of a wheel brake having a master cylinder that pressurizes oil to generate hydraulic pressure, and a wheel cylinder that regulates a disc drum of a wheel by the master cylinder.

The brake pedal uses the principle of a lever. It is installed around the point of action, and when the driver steps on the pedal, the force acting on the push rod at the fixed point pushes the piston of the master cylinder via the booster to generate hydraulic pressure. Hydraulic pressure is constantly transmitted to the cylinders of each wheel brake to apply braking force.

The booster is a device that multiplies the driver's pressure transmitted from the brake pedal to the master cylinder, that is, an amplifying element that increases the brake operating force. An indirect control method of a hydro vac method is applied, and a direct control method of a master vac method is applied to operate a booster using vacuum obtained from an intake manifold of an engine in the case of a general passenger vehicle.

The master cylinder is an element that converts the power of stepping on the brake pedal into hydraulic pressure. It contains brake fluid and a piston to transmit the generated hydraulic pressure to the wheel cylinder through the brake pipe, and the piston inside the wheel cylinder Pushed by hydraulic pressure, brake shoes or brake pads are pushed against the drum or disc to generate braking force. These master cylinders are a tandem type in which two master cylinders are arranged in series in order to compensate for the lack of braking in the event of a failure such as leaking brake fluid in the hydraulic system and to increase safety, and a piston of different diameter. When one circuit is damaged, the pressure of the remaining circuit increases to compensate for the lack of braking force, and is used in vehicles equipped with ABS (anti-lock brake system). It is applied when a tandem master cylinder with central valve replaces the function of the compensation port with a central valve installed on the piston, and when a cup seal is used in the wheel cylinder of the drum brake, it is applied to the brake pipe or It is divided into a residual pressure valve type (residual check valve) that is assembled to the master cylinder and brake pipe or installed inside the master cylinder.

As described above, the vehicle is equipped with wheel brakes that brake the front and rear wheels for the purpose of decelerating and stopping while driving, and boosters and master cylinders, which are amplifying elements that transfer operating pressure to the wheel brakes by forming braking hydraulic pressure, so that the driver When you step on the brake pedal, the booster greatly amplifies (boost) the small force applied to the brake pedal, and the master cylinder, a hydraulic element that converts the large force into hydraulic pressure and transmits constant pressure (hydraulic pressure) regardless of the distance to the brake system. , Braking force is generated by transferring the transmitted hydraulic pressure to a wheel brake equipped with a hydraulic cylinder having a large area and a brake pad having excellent frictional force so that a large force can be generated.

On the other hand, since the braking performance of a vehicle is directly related to safety, manufacturers are conducting inspections on elements constituting the braking system.

As a braking performance inspection technology according to the prior art, Korean Patent Registration No. 10-0405569, there is a 'braking performance evaluation test device', and in claim 1, 'a wheel speed sensor for detecting whether or not the vehicle is running, and a brake pedal A brake pedal sensor that detects the operation of the brake pedal sensor, a pressure sensor that detects the braking pressure supplied through the brake pipe when braking force is generated in the running vehicle, and a target braking pressure set according to the conditions and types of the braking performance evaluation experiment An electronic control unit in which a target time required to reach the target braking pressure is input and a braking pressure holding time for maintaining the target braking pressure constant until braking is completed is input, and the brake pipe is installed to be connected to the Auxiliary braking hydraulic pressure generating means for generating auxiliary braking hydraulic pressure while being selectively driven by the control of the electronic control unit, and braking hydraulic pressure generated by the operation of the brake pedal and auxiliary braking hydraulic pressure generating means generated by driving the auxiliary braking hydraulic pressure generating means The first pressure control valve whose opening path is controlled by the control of the electronic control unit so that braking hydraulic pressure is selectively supplied to the brake body according to the braking performance evaluation test stage, the brake pipe connected to the brake body of the front wheel, and the brake of the rear wheel A braking performance evaluation experiment device 'which is configured to include a plurality of second pressure control valves installed on the brake pipe connected to the main body and selectively opened and closed by the control of the electronic control unit according to the braking performance evaluation experiment step is disclosed. has been

The braking performance evaluation test device according to the prior art enables the calculation and collection of braking performance data in the vehicle development stage to promote the development of a vehicle with excellent braking performance, but it is difficult to confirm the presence or absence of abnormalities in various components constituting the braking system. There were unavoidable drawbacks. That is, the conventional braking performance evaluation test apparatus cannot be applied to a general commercial vehicle and used for the purpose of checking the braking performance state of the vehicle.

In addition, as the prior art, Republic of Korea Patent Publication No. 10-0348040, 'brake booster performance test device' has been proposed, and in claim 1, 'shelf member; An arm member mounting bracket in which an arm member rotatably fixed on the other side is hinged to move by being hinged to the movable rod of the brake booster on one side, and a booster mounting having an opening through which the movable rod side of the booster passes Mounting means consisting of a bracket for mounting the arm member and the booster at a predetermined distance from each other on the shelf member; a vacuum means for making the inside of the booster into a negative pressure state; and a braking performance checking means for inspecting an appropriate braking state of a wheel according to the operation of the booster.

The performance test device of the brake booster of this configuration allows the performance of the brake booster to be checked before it is installed on the vehicle so that the use of defective products can be prevented in advance. There was a problem.

However, most of the conventional braking performance testing devices of vehicles are used for performance evaluation of each component constituting the braking system at the vehicle manufacturing stage or for determining whether or not there is a defect before installing the corresponding part in the vehicle. Due to the disadvantage of not being able to check whether or not there is an abnormality in the braking performance of a vehicle shipped according to the present invention, there is an urgent need to develop a device capable of solving this problem.

In other words, as each part deteriorates or deteriorates while driving, information such as engine speed, engine temperature, fuel amount, battery status, coolant temperature, and speedometer related to the driving performance of the vehicle is provided to the driver in real time. On the other hand, information related to braking performance for stopping and decelerating is not provided at all, resulting in serious problems leading to accidents in the event of an abnormality in the braking system during operation.

In addition, even in the safety inspection conducted on vehicles that are regularly operated, only the degree of lighting of the brake light and the amount of brake oil are checked, but the inspection of the braking performance is not performed properly.

Therefore, since the vehicle must be driven in a state in which it is impossible to clearly check whether or not there is an abnormality in the braking system, the driver's safety is not guaranteed.

For example, while the braking power of a vehicle is in excellent condition at the time of shipment, the braking power decreases over time, while the performance of the driving force of the engine is maintained constant as it is regularly managed until the vehicle is scrapped. After all, in relation to the driving performance of the vehicle, the performance can be maintained through regular vehicle inspection and management, but the situation in which the braking performance of the vehicle is not managed because there is no special inspection standard, so it is urgent to prepare countermeasures for this. am.

In order to solve this problem, the present applicant has proposed a 'vehicle braking system safety management monitoring device' through Korean Patent Registration No. 10-1474688, and in claim 1, 'brake pedal that receives the driver's effort constituting the vehicle braking system' And a booster, which is an amplifying element that doubles the pedal force in conjunction with the pedal force of the brake pedal, a master cylinder connected to the booster to pressurize oil to generate operating pressure, and a disk drum connected to the master cylinder and provided with disk pads of wheels. In the vehicle braking system safety management monitoring device for determining the presence or absence of abnormalities in the braking system having a wheel cylinder for regulating,

A leg force sensor installed on one side of the brake pedal to detect a leg force, a vacuum sensor to detect a vacuum pressure in the booster, a pressure sensor to detect a pressure in the master cylinder, a pad sensor to measure wear of the disk pad, and the leg force It is connected to the sensor, the vacuum sensor, the pressure sensor, and the pad sensor to receive the detection value, and compares it with the previously input standard setting value to determine whether there is an abnormality and outputs the result as a control signal. It is an element for guiding at least one or two or more of the processing result value, foot force sensor detection value, vacuum sensor detection value, pressure sensor detection value, and pad sensor detection value to the driver in real time, through a display or sound that displays the information on the screen. a real-time display unit consisting of one or both of the output speakers; a connector that is a connection element providing the information to an external measuring device; A vehicle braking system safety management monitoring device characterized in that it is configured to further include; a starting control unit that selectively regulates not to start the vehicle according to the processing result value.' is disclosed.

The prior art proposed by the present applicant discloses a configuration in which it is possible to check in real time whether or not there is an abnormality in the braking system for a vehicle in operation after being shipped out, and forcing the vehicle to be unable to operate when the vehicle is restarted when the braking performance does not meet the standard value. , When the prior art is shipped and installed on a running vehicle, it is difficult to install due to its complex configuration, and it is difficult to apply it universally to virtually all vehicle types because it is difficult to install and structural changes must be made according to the vehicle type. there was.

To elaborate, the braking system is largely divided into 4 generations. First, in the case of first-generation cars, the engine that generates driving force and the braking system that generates braking force are independently applied. In the case of these first-generation cars, the output of the engine Since it is low and has a slow operating speed, a method of generating braking force directly with the driver's power regardless of whether the engine is running is applied, and a wire-type braking device similar to the current bicycle brake method is used.

In the case of second-generation vehicles, a method in which the engine, which is the driving source, and the braking system are interlocked is applied. In this second-generation vehicle, the vacuum pump constituting the braking system is operated according to the engine operation to generate negative pressure of the booster, typically by manual operation. Gear type vehicles are applicable. Since such a manual gear type vehicle requires shift operation to drive after turning on the vehicle, a delay time naturally occurs due to the shift operation, so the vacuum pump operates immediately after engine startup to generate negative pressure in the booster, resulting in As a result, accidents due to sudden acceleration do not occur.

In the case of a third-generation vehicle, as in the second generation, it is an interlocking type in which braking force is generated by receiving power from the engine, and an automatic gear shifting vehicle called automatic corresponds to this. In the case of an automatic gear shifting vehicle, braking force is generated after the engine is started as in the case of second-generation vehicles with a manual gear shifting method, but the operation time required for shifting is considerably shorter or limited compared to the manual gear shifting method, so sudden acceleration occurs when high output occurs due to engine failure. There were problems that caused such accidents.

In particular, the number of accidents due to sudden acceleration is also increasing as third-generation vehicles with automatic gear shifting, which are highly convenient for driving, are becoming the mainstream, which receives power from the engine of the vehicle and operates the brake system. This is because the vacuum pump and the booster, which are the constituent elements, are configured to operate.

That is, most vehicles according to the prior art have a configuration in which braking force is secured in the next priority after the engine is driven, so even when an abnormality occurs in the braking system and the braking force is lost, there are no restrictions on the departure or driving of the vehicle. There were serious problems with this.

The present applicant has conducted an experiment in which the engine is started by removing the vacuum pressure device constituting the braking system from a vehicle actually in operation.

The experiment was conducted on the Avante vehicle, and with all the components related to the leg force amplifying device removed, starting and shifting were attempted, but it was confirmed that the engine started normally and shifted without any restrictions.

That is, even if the brake device is detached from the vehicle, it can be seen that the engine is started without any restrictions and the gear is shifted to allow driving. As mentioned above, it is caused by structural defects of the vehicle.

The structural defect of the vehicle claimed by the present applicant is because the engine and the brake system should be organically linked and operated, but in reality, each is designed and manufactured to be operated as an independent device.

To elaborate on this, the engine starts regardless of the braking force of the vehicle and generates driving force for driving, whereas the braking system has a subordinate structure in which braking force is generated using the driving force of the engine after the engine is started. It is made.

In other words, from the perspective of the driver's safety, braking should be the priority, not the engine. As most vehicles currently prioritize the engine rather than the safety-related braking system, structural defects situation that is occurring.

To explain further, due to the characteristics of gasoline vehicles controlling the output by adjusting the amount of air, when the throttle valve closes and the piston descends, a vacuum is formed in the intake manifold and the brake booster is pulled, resulting in the braking force of the engine. It is a structure that is affected by the driving force.

As a result, not only is it possible to start the engine without difficulty even when the braking power is not guaranteed or the braking power is lost, but also the gearshift system related to driving is operated without any problems. This inevitably causes significant damage, and even if a brake system failure occurs while driving, the risk of an accident due to loss of braking power is inevitably increased.

Therefore, the brake system, which is controlled by the drive system related to the previous engine, is independent of the control of the engine, and the function and operation are stably performed in a priority order, while enabling the brake device to be involved in the drive control of the engine. There is an urgent need for improvement.

Republic of Korea Patent Registration No. 10-0320376 (2001.12.28.) Republic of Korea Patent Registration No. 10-0405569 (2003.11.03) Republic of Korea Patent Registration No. 10-0560840 (2006.03.07.) Republic of Korea Patent Registration No. 10-1474688 (2014.12.12.) Republic of Korea Patent Registration No. 10-1553779 (2015.09.10.) Republic of Korea Patent Registration No. 10-0721060 (2007.05.16.)

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to prioritize braking power from the moment the vehicle is used to ensure accurate and stable stability before the vehicle starts or in any case while driving. Priority braking system of a highly reliable vehicle and its braking by guaranteeing the braking force first, and ensuring stable braking performance regardless of the occurrence of an abnormality in the driving system such as the engine by enabling independent operation from the driving system. is to provide a way

Priority braking system of a vehicle according to an embodiment of the present invention for realizing the above object is a brake that is connected to a vacuum pump to generate negative pressure as an amplification element that doubles the pedal force by interlocking with the brake pedal receiving the driver's pedal force. A priority braking system for a vehicle equipped with a booster, comprising: a starting detection unit for detecting a position of an ignition switch at LOCK-ACC-ON-START of a vehicle and whether or not an engine is driven; A braking control unit that operates by receiving a detection signal from the start detection unit, detects vacuum pressure of the brake booster, compares it with a preset vacuum pressure value, and selectively applies a control signal for an on/off operation to the brake booster; It is characterized in that it consists of a braking power supply unit for supplying power to the braking control unit and the brake booster.

As a preferred feature of the present invention, the start detection unit includes an ON detection module that detects the movement of the vehicle's ignition switch from the ACC position to the ON position; and the braking control unit receives a detection signal from the start detection module When the negative pressure detection module detects the vacuum pressure of the brake booster by operation and the vacuum pressure detected from the negative pressure detection module is less than the set value, an off signal is applied to the ignition switch to prevent the vehicle from starting and the set value is met. A starting control module that controls the start switch to start, and a vacuum pressure control module that drives the operation of the vacuum pump when the vacuum pressure of the brake booster is less than the set value and stops the operation of the vacuum pump when it is detected to be higher than the set value; in what is composed

As another preferred feature of the present invention, the braking control unit may include a vehicle speed detection module for detecting a vehicle speed; a negative pressure detection module for detecting vacuum pressure of the brake booster; By receiving the detection signal from the negative pressure detection module, when the vacuum pressure of the brake booster is less than the set value, an operation control signal is applied to the vacuum pump to control the vacuum pressure of the brake booster to reach the set value, and the brake booster It consists of a vacuum pressure control module that stops the operation of the vacuum pump when the air pressure reaches the set value.

As another preferred feature of the present invention, the braking control unit receives a detection signal in real time from the engine detection module of the engine detection unit for detecting the driving of the engine and the pedal force detection module for detecting the effort applied to the accelerator pedal of the vehicle. A rapid acceleration/regulation module for outputting a control signal to cut off fuel or power supplied to the engine when the engine speed is greater than the set value under the condition that the leg power is less than the set value by comparing and determining the number of revolutions of the engine according to the preset amount of leg power; an emergency notification module that receives a control signal from the rapid acceleration control module and selectively outputs it as sound or a screen; It is composed of an avoidance start-up maintenance module that receives a control signal from the engine stop module and selectively supplies and maintains the power of the braking power unit to the steering wheel and the ABS.

As another preferred feature of the present invention, the braking control unit receives a detection signal in real time from a vehicle speed detection module for detecting the vehicle speed and an engine detection module for detecting the driving of the engine, and detects the vehicle speed in a state where the engine driving is stopped. An engine stop detection module for determining a condition to apply a control signal; It consists of an avoidance start-up maintenance module that receives a control signal from the engine stop detection module and selectively supplies and maintains the power of the braking power unit to the steering wheel and the ABS.

As another preferred feature of the present invention, the start detection unit, an ACC detection module for detecting the ACC position of the ignition switch, an ON detection module for detecting the movement of the ignition switch from the ACC position to the ON position, and the start It consists of a starting detection module that detects that the switch moves from the ON position to the START position and then returns to the ON position.

As another preferred feature of the present invention, the braking power unit may include a braking battery connected to and charged with a vehicle generator; a voltage sensing module for detecting the voltage of the brake battery and applying detection information; It is connected to the voltage detection module and is composed of a low voltage notification module that selectively outputs a sound or a screen when the detected voltage does not reach a set value.

In order to achieve the above object, a braking method of a priority braking system of a vehicle according to an exemplary embodiment of the present invention is an amplifying element that doubles the pedal force in conjunction with a brake pedal that receives a driver's pedal force and is connected to a vacuum pump to generate negative pressure. A method for controlling a priority braking system of a vehicle having a brake booster to generate, comprising: a starting preparation step of detecting that a starting switch is moved from a LOCK state to an ACC;

A pre-start negative pressure sensing step of detecting the internal pressure of the brake booster in the above step and comparing and determining whether or not the set value is satisfied; When the negative pressure of the brake booster is less than the set value, the vacuum device is driven until the set value is reached, and at the same time, the start switch blocks the movement to the START position.

As one preferred feature of the present invention, detecting the speed of the vehicle; It consists of a negative pressure maintenance step of detecting the negative pressure of the brake booster and, when the negative pressure is less than the set value, driving the vacuum pump until the negative pressure reaches the set value and applying a control signal to stop the operation when the set value is reached.

As another preferred feature of the present invention, the step of detecting the amount of pedal force applied to the accelerator pedal of the vehicle; Engine speed detection step of detecting the number of revolutions of the engine; Comparing and determining the detected actual engine speed and the number of engine revolutions according to a preset amount of leg power; An engine forced stop step of comparing the detected actual engine speed with engine speed according to a preset amount of leg power, and cutting off fuel or power supplied to the engine when the actual engine speed exceeds a preset value range; an emergency notification step of outputting an evasion maneuver according to an engine failure in the sound or screen in the engine forced stop step; In the engine forced stop step, the power supplied to the steering wheel and the ABS is alternately supplied as emergency backup power to maintain operation.

As another preferred feature of the present invention, the vehicle speed detection step of detecting the speed of the vehicle; Engine driving detection step of detecting the driving of the engine; It is composed of an avoidance maneuver support step of determining if the engine is stopped under the condition that the vehicle speed is detected and selectively supplying power to the steering wheel and the ABS in a detour.

Priority braking system and braking method of a vehicle according to the present invention enable the configuration of the braking system involved in the braking force of the vehicle to be operated independently, thereby ensuring effective and stable braking performance at all times regardless of whether the vehicle is running or not. Accordingly, there is a useful effect of preventing the possibility of a safety accident due to loss of braking force in advance and increasing reliability and stability of the braking performance of the vehicle.

In addition, since the present invention has a simple structure and a relatively small number of parts, reliability of operation and convenience of maintenance are good, and it can be economically installed and used on various vehicles currently in operation regardless of the vehicle type, so the industry A useful effect is expected.

In addition, by detecting the negative pressure of the booster that generates braking force and limiting engine starting according to the set value, it is possible to prevent the vehicle from starting in a state where the braking force is not guaranteed, and also to prevent the pressure change of the booster while driving the vehicle. There is an advantage in preventing the risk of an accident due to loss of braking power by automatically controlling the pressure of the booster to be maintained above the set value when it is detected in real time and falls below the set value.

That is, in the past, by making the brake booster operate by receiving the driving force of the engine, it is operated by receiving an independent power supply, so that effective braking performance can be guaranteed regardless of the occurrence of an abnormality in the engine. It prevents the risk of an accident due to loss of braking power by allowing normal braking power to be exerted even in various unpredictable unexpected situations such as acceleration, sudden acceleration, engine stop while driving, brake slippage, etc. Also, performance failure of the braking system during engine startup Alternatively, it is possible to prevent an accident caused by starting in a state in which braking performance is lost by detecting an abnormality in advance and preventing the engine from starting.

In addition, the present invention determines whether there is an abnormality when the negative pressure of the brake boost that generates braking force drops below a set value while the output of the engine suddenly rises at a high speed while the vehicle is running, and guides the driver so that the driver can recognize it. There is an effect of increasing safety by blocking fuel supplied or power supplied to the engine so that the engine operation can be stopped as a result.

In addition, the present invention not only guarantees a stable braking power even in a situation where normal driving is impossible due to the ignition off phenomenon while driving, but also controls the steering wheel for steering the vehicle to operate normally, and also controls the steering wheel to be operated rapidly for avoiding danger. The advantage of greatly reducing the risk of safety accidents is expected by controlling the ABS to prevent wheel locking according to normal operation.

Features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be interpreted in a conventional and dictionary sense, and the inventor may appropriately define the concept of the term in order to explain his or her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that there is.

1 is a block diagram schematically shown to explain the configuration operation of a priority braking system of a vehicle according to the present invention;
2 is a configuration circuit diagram for explaining the configuration of a priority braking system for a vehicle according to the present invention;
3 is a conceptual configuration diagram schematically showing an application example using a priority braking system for a vehicle according to the present invention;
4 to 7 are schematic diagrams for explaining the brake operation in the engine starting step according to the priority braking system of the vehicle in the title according to the present invention;
8 is a block diagram for explaining a priority braking system of a vehicle according to the present invention;
9 is a flowchart for explaining a method for controlling engine startup for a vehicle according to the present invention;
10 and 11 are photographs of a prototype of a brake negative pressure forming integrated boost by a priority braking system of a vehicle according to the present invention.

Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

However, it is not intended to limit the present invention to a specific disclosure, and it should be understood to include all changes, equivalents, or substitutes included in the spirit and technical scope of the present invention. In this application, terms such as "comprise" or "having" are intended to designate that a feature, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features, steps, or operations However, it should be understood that it does not preclude in advance the possibility of the presence or addition of components, parts, or combinations thereof. That is, throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. don't

Here, repeated descriptions, well-known functions that may unnecessarily obscure the subject matter of the present invention, and specific descriptions of configurations are omitted in order not to obscure the subject matter of the present invention. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clarity.

1 is a block diagram schematically shown to explain a configuration operation of a priority braking system for a vehicle according to the present invention.

2 is a configuration circuit diagram for explaining the configuration of a priority braking system for a vehicle according to the present invention.

3 is a conceptual configuration diagram schematically illustrating an application example using a priority braking system for a vehicle according to the present invention.

4 to 7 are schematic diagrams for explaining a brake operation in an engine starting stage according to a priority braking system of a vehicle in the title according to the present invention.

8 is a block diagram for explaining a priority braking system for a vehicle according to the present invention.

9 is a flowchart illustrating a method for controlling engine startup for a vehicle according to the present invention.

10 and 11 are photographs of prototypes of the integrated boost for forming brake negative pressure by the preferential braking system of a vehicle according to the present invention.

First in the drawing. When the engine stop (key OFF signal) detection signal by the car key switch is turned on,

1) Save the brake device boost negative pressure detection signal data value (boost negative pressure) and display it on the boost negative pressure display 1.

2) As the time (stopwatch) progresses, the progress time is displayed in the negative pressure comparison time.

3) The brake system boost negative pressure detection signal (boost negative pressure) is displayed on the boost negative pressure display 2.

Second, when a brake operation signal or a start switch ON signal is input,

1) While the time (stopwatch) is stopped, the progressed time is displayed in the negative pressure comparison time.

2) Compare the boost negative pressure detection signal (boost negative pressure) data, the data value stored when the engine stop (key OFF signal) detection signal is on, the progress time (stopwatch) value, and the confidentiality performance data value of the brake boost device product to display the state of the boost device (product performance or defective state) in the boost device performance display (%).

In summary, the boost negative pressure detection signal data value (boost negative pressure) at the moment when the engine stop (key OFF signal) detection signal is turned on, the boost negative pressure detection time (stopwatch) data value (time), the brake operation signal or , The boost negative pressure detection signal data value (boost negative pressure) at the moment when the ignition switch ON signal is turned on is compared with the data value of the confidentiality performance table of the boost device, and the performance of the boost device is displayed as an indicator so that the driver can know do it

In addition, when the performance of the boost, which is a braking device, is rapidly deteriorated, a warning device is operated and the driver's safety is protected by preventing the engine from starting.

For reference, in the above description and drawings, each data value is displayed as an indicator, but it can be displayed as one indicator using a selection switch (mode MODE key).

2 is a configuration circuit diagram for explaining the configuration of a priority braking system for a vehicle according to the present invention, and FIGS. 3 to 5 are circuit diagrams for explaining an embodiment of a braking device in the priority braking system for a vehicle according to the present invention. .

In the drawing, a basic electrically operated circuit diagram according to an embodiment of the vehicle priority braking system according to the present invention is shown.

1) When the vehicle ignition switch is in the ACC position (including the ON position), the vacuum device (vacuum pump, etc.) operates, and the tank of the boost device (hydro bag or booster device, etc.) has negative pressure above a certain standard (setting the 1st negative pressure) Once formed, the engine can be started. That is, the engine does not start until the negative pressure above a certain standard (normal negative pressure) of the brake device is formed, and the engine starts only when the negative pressure is formed.

2) If the negative pressure falls below a certain standard for any reason while driving, the vacuum system automatically operates to form negative pressure to protect the safety of the driver. In addition, even when the engine is stopped while driving, the vacuum device automatically operates to form negative pressure to protect the driver's safety.

3) When the ignition switch is in the ACC position (including the ON position), the vacuum device (vacuum pump, etc.) operates, and negative pressure is formed in the tank of the brake boost device (hydroback or booster device, etc.), and the negative pressure of the first set value is When it is formed, the engine can be started, and when the negative pressure of the second set value is formed, the operation of the vacuum device (vacuum pump, etc.) is stopped.

4) Even in a vehicle equipped with an automatic engine starting device, when the engine starting switch (start switch) is turned on, the vacuum device (vacuum pump, etc.) operates first, so that the negative pressure inside the tank of the brake boost device is negative pressure above a certain standard (primary Negative pressure setting) must be formed so that the engine can be started.

Hereinafter, the circuit diagram function and operation will be described.

1) function

1. The main battery refers to the battery that supplies power to the entire vehicle electric and electronic control system.

2. Auxiliary battery refers to a battery that supplies power to the vacuum device and control unit in the key ACC, ON, steps before starting the engine.

3. The anti-reverse diode installed between the main battery and the sub-battery is a well-known anti-reverse circuit element that prevents electricity from flowing from the sub-battery to the main battery in any case.

In other words, even if the main battery is damaged or its performance deteriorates, the auxiliary battery supplies power to the vacuum device to safely stop the car even in an emergency, preventing accidents due to loss of braking power in advance to protect the safety of the driver and passengers. .

4. Diodes installed in ACC (key stage 1) and IG 1 (ON key stage 2) power supply are circuits that do not affect the function of each key stage.

5. With the control unit. The negative pressure sensor is supplied with power even when the vehicle is stopped. At this time, the current consumption is very low at several mmA, so it does not affect the battery much even if it has not been operated for a long time.

The operation will be described below.

1. When relay R3 is turned on through the relay R2b contact in the key ACC, ON step, which is the stage before starting the engine, electricity is supplied to the vacuum device through the R3a contact and negative pressure is formed inside the tank of the brake boost device.

2. When the negative pressure inside the tank of the brake boost device is formed at the first set value (negative pressure), when the negative pressure sensor signal 1 is on, the R1 relay is operated and the engine start relay can be operated by the R1a contact.

3. When the negative pressure inside the tank continues to form the second set value (negative pressure) by the operation of the vacuum device, the negative pressure sensor signal 2 is turned on, the R2 relay is operated, the contact point R2b is turned off, and R3 is turned off. The relay is off and the vacuum system stops working. Here, in the vacuum device, after the R2 relay is operated, even if the negative pressure inside the tank of the brake boost device is lowered to the second set value (negative pressure) or less, electricity is supplied to the R2 relay through the R1a contact and the R2a contact, and the R3 relay operates. The off state is maintained and the vacuum device does not operate. (R2 self-holding circuit)

4. When the negative pressure inside the tank of the brake boost device drops below the first set value (negative pressure), the self-holding circuit of the R2 relay is released, and the R3 relay is turned on by the R2b contact, and electricity is supplied to the vacuum device through the R3a contact. negative pressure is formed inside the tank of the brake boost device.

5. When the engine is stopped while the car is running and the negative pressure inside the tank of the brake boost device drops below the primary set value, the R2 self-maintenance circuit is released, the R3 relay is turned on, and electricity is supplied to the vacuum device through the R3a contact. A negative pressure is formed inside the brake boost device tank.

In addition, when the negative pressure of the brake device drops below the primary set value due to an abnormality in the engine while the vehicle is running, the R2 self-holding circuit is released, the R3 relay is turned on, and electricity is supplied to the vacuum device through the R3a contact, and the brake Since negative pressure is formed inside the boost device tank, the vehicle can be stopped safely and the safety of the driver can be protected.

FIG. 6 is a diagram for explaining how a vacuum device operates by receiving a signal from a negative pressure sensor at an ACC, ON position of an ignition switch of a vehicle.

As shown in the drawing, it operates automatically in sections ① and ② after starting the engine, or operates continuously with the engine when the engine is running, and then automatically operates in sections ① and ② when the engine is stopped and the ignition switch is in the ACC, ON position. A configuration is shown.

7 is a schematic diagram for explaining a starting control configuration in a priority braking system and braking method of a vehicle according to the present invention.

The figure shows a configuration in which the engine is started in sections ④ and ⑤ when the negative pressure meets the set value while the engine is not started in sections ③ and ④ and maintained in a standby state.

Referring to the above drawings, a priority braking system and control method of a vehicle according to the present invention will be described.

First, the priority braking system of a vehicle according to the present invention is applied to a priority braking system of a vehicle equipped with a vacuum device for generating negative pressure by being connected to a vacuum pump as an amplifying element that doubles the pedal force in conjunction with the brake pedal receiving the driver's pedal force. It is largely composed of a starting detection unit, a negative pressure detection module 30, and a braking control unit 50.

The start detector is an element that detects the position of the start switch in ACC-ON-START and whether or not the engine is started. This start detector detects the ACC position of the start switch and the ON position of the start switch. It consists of an ON detection unit and a start detection unit that detects whether the engine is started by detecting the START position of the ignition switch.

On the other hand, the known key insertion type start switch is largely divided into lock-off-accessory (ACC)-on-start.

The lock (LOCK) is a position where a key can be inserted and removed, and the handle is locked when the key is removed.

The off (OFF) is not marked on the ignition switch, but is a position to stop while turning the key from ACC to LOCK direction, and corresponds to a position to press the PUSH button.

The accessory (ACC) is a position where the engine is stopped and the audio, electric mirror, cigarette lighter, and wiper can be used.

ON is a position where all electric devices can be used, and it is the previous stage where the engine can be started.

START is a switch that starts the engine and automatically returns to the ON position when you let go of your hand when starting. In general, when moving from the ON position to the START position, most of the power not related to engine starting among the power supplied to each electric component of the vehicle is temporarily cut off, and in the present invention, a holding circuit module is additionally configured to prevent this.

The negative pressure detection module 30 is a detection element constituting the vacuum device 100 by being circuit-connected to the start detection unit and receiving a detection signal. At this time, the vacuum device 100 includes a vacuum pump as well as a vacuum pressure tank or vacuum pressure line, and the negative pressure detection module 30 may use a known negative pressure sensor or pressure sensor for detecting pressure.

The braking control unit 50 receives the detection signal from the negative pressure detection module 30 and compares and processes the negative pressure value with the set negative pressure value. As an element that controls not to be caught, the braking control unit 50 largely consists of a starting control unit 51, a vacuum pressure control unit 52, and a holding circuit control unit 53.

The start control unit 51 is a control element that intermittently controls so that the vehicle does not start when the vacuum pressure in the vacuum tank of the vacuum device is less than a set value.

The vacuum pressure controller 52 controls the operation of the vacuum pump to meet the set value by driving the operation of the vacuum pump when the vacuum pressure is less than the set value, and stops the operation of the vacuum pump when the set value is met or greater than the set value. is a control factor.

The holding circuit controller 53 supplies components related to driving the negative pressure detection module 30, the vacuum pressure detection module 50, and the vacuum device 100 in the process of moving the start switch from the ON position to the START position. It is an element that controls the holding circuit module that keeps the power supplied to each electrical component so that the power to be cut off is not cut off.

Here, the holding circuit module may be provided as an electric circuit or may be proposed as a separate auxiliary battery, and since this may be implemented by a known technique, a detailed description thereof will be omitted.

A control method using the priority braking system of a vehicle according to the present invention configured as described above will be described below.

First, the present invention is an amplifying element that doubles the pedal force in conjunction with a brake pedal receiving a driver's pedal force, and is connected to a vacuum pump to control a vacuum device generating negative pressure and engine startup.

(a) a start-up preparation step for detecting that the start-up switch is moved from an OFF state to an ACC;

(b) a pre-start negative pressure sensing step of detecting the internal pressure of the vacuum device in the above step and comparing and determining whether or not the set value is satisfied;

(c) a pre-start negative pressure generating step of driving the vacuum device until the negative pressure of the vacuum device reaches the set value when the negative pressure of the vacuum device is less than the set value;

(d) an engine starting step of detecting a state in which the engine is started by moving the start switch from the ACC state to the START position;

(e) detecting the internal pressure of the vacuum device in a state where the engine is started and comparing and determining whether the set value is met;

(f) a negative pressure generating step after startup of driving the vacuum device until the negative pressure of the vacuum device reaches the set value when the negative pressure of the vacuum device is less than the set value.

On the other hand, in the (d) engine starting step, a circuit maintenance step for maintaining the power supply so that the power supplied to the vacuum device is not cut off while the start switch is moved from the ON position to the START position is further included. It can be.

On the other hand, the present invention is not limited to the described embodiments, it is possible to change and use the application site, and various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have knowledge. Therefore, such variations or modifications should fall within the scope of the claims of the present invention.

1: The vehicle's priority braking system and its braking method.
10: start detection unit
30: negative pressure detection module
50: braking control unit
51: start control unit
52: vacuum pressure control unit
53: holding circuit control unit

Claims (11)

In the priority braking system of a vehicle having a brake booster that is connected to a vacuum pump to generate negative pressure as an amplifying element that doubles the pedal force in conjunction with the brake pedal receiving the driver's pedal force,
It detects the position of the ignition switch and whether or not the engine is driven. The ACC detection module detects the ACC position of the ignition switch, the ON detection module detects the movement of the ignition switch from the ACC position to the ON position, and the ignition switch is in the ON position. A starting detection unit made of a starting detection module that detects that the position is returned to the ON position after moving from the START position;
A braking control unit operating by receiving a detection signal from the start detection unit to detect the vacuum pressure of the brake booster, compare it with a preset vacuum pressure value, and selectively apply a control signal for vacuum formation to the vacuum tank of the brake booster;
A priority braking system for a vehicle, characterized in that composed of; a braking power supply unit supplying power to the braking control unit and the brake booster. The method of claim 1, wherein the start detection unit comprises an ON detection module for detecting a movement of the vehicle's ignition switch from an ACC position to an ON position;
The braking control unit is operated by receiving a detection signal from the start detection unit and includes a negative pressure detection module that detects the vacuum pressure of the brake booster and prevents the vehicle from starting when the vacuum pressure detected from the negative pressure detection module is less than a set value. and a starting control module for controlling start-up when the set value is met, and a vacuum pressure control for driving the operation of the vacuum pump when the vacuum pressure of the brake booster is less than the set value and stopping the operation of the vacuum pump when it is detected above the set value. A priority braking system for a vehicle, characterized in that it is configured to include a; module. The method of claim 1, wherein the braking control unit,
a vehicle speed detection module for detecting a vehicle speed;
a negative pressure detection module for detecting vacuum pressure of the brake booster;
By receiving the detection signal from the negative pressure detection module, when the vacuum pressure of the brake booster is less than the set value, an operation control signal is applied to the vacuum pump to control the vacuum pressure of the brake booster to reach the set value, and the brake booster A vacuum pressure control module for stopping the operation of the vacuum pump when the air pressure reaches the set value;
Priority braking system of a vehicle, characterized in that configured to include.
The method of claim 1, wherein the braking control unit,
It receives detection signals in real time from the pedal force detection module that detects the pedal force applied to the vehicle's accelerator pedal and the engine detection module of the engine detection unit that detects the operation of the engine. In case of abnormality, a rapid acceleration control module for outputting a control signal to cut off fuel or power supplied to the engine;
an emergency notification module that receives a control signal from the rapid acceleration control module and selectively outputs it as sound or a screen;
A priority braking system for a vehicle, characterized in that it is configured to include; an avoidance start-up maintenance module that receives a control signal from the engine detection module and selectively supplies and maintains the power of the braking power unit to the steering wheel and the ABS.
The method of claim 1, wherein the braking control unit,
The vehicle speed detection module detects the speed of the vehicle and the engine detection module detects the operation of the engine, receives the detection signals in real time, determines the conditions under which the vehicle speed is detected while the engine is stopped, and applies the control signal to the engine stop detection module. ;
an avoidance start-up maintenance module that receives a control signal from the engine stop detection module and selectively supplies and maintains the power of the braking power unit to the steering wheel and the ABS;
Priority braking system of a vehicle, characterized in that configured to include.
delete The method of claim 1, wherein the braking power supply unit,
A braking battery charged by being connected to the vehicle's generator;
a voltage sensing module for detecting the voltage of the brake battery and applying detection information;
a low voltage notification module that is connected to the voltage detection module and selectively outputs a sound or a screen when the detected voltage does not reach a set value;
Priority braking system of a vehicle, characterized in that configured to include.
In the control method of a priority braking system of a vehicle having a brake booster connected to a vacuum pump to generate negative pressure as an amplifying element that doubles the pedal force in conjunction with the brake pedal receiving the driver's pedal force, the method comprising:
A start-up preparation step of detecting that the start-up switch is moved from the LOCK state to the ACC;
a pre-start negative pressure sensing step of detecting the internal pressure of the brake booster in the start-up preparation step and comparing and determining whether or not a set value is met;
When the negative pressure of the brake booster is less than the set value, the vacuum pump is driven until the set value is reached, and at the same time, the negative pressure generation step before starting blocks engine start even when the start switch generates a START signal; characterized in that it is configured to include a Control method of a priority braking system for a vehicle to be. 9. The method of claim 8, further comprising: detecting engine operation and running of the vehicle;
A negative pressure maintenance step of detecting the negative pressure of the brake booster and, when the negative pressure is less than the set value, driving the vacuum pump until the negative pressure reaches the set value and applying a control signal to stop the operation when the negative pressure reaches the set value; Control method of a priority braking system for a vehicle characterized in that.
The method of claim 8 , further comprising: a pedal force sensing step of detecting a pedal force applied to an accelerator pedal of a vehicle;
Engine speed detection step of detecting the number of revolutions of the engine;
Comparing and determining the detected actual engine speed and the number of engine revolutions according to a predetermined pedal force sensor signal;
Engine forced stop step of cutting off fuel or power supplied to the engine when the detected actual engine speed is compared with the engine speed according to the preset pedal force sensor signal, and the actual engine speed is higher than the value at the time of the pedal force sensor signal. ;
an emergency notification step of outputting an evasion maneuver according to an engine failure in the sound or screen in the engine forced stop step;
The control method of a priority braking system for a vehicle, characterized in that it is configured to further include; an avoidance starting support step of maintaining the operation by bypassing the power supplied to the steering wheel and the ABS in the engine forced stop step. 9. The method of claim 8, further comprising: a vehicle speed detection step of detecting a vehicle speed;
Engine driving detection step of detecting the driving of the engine;
A control method of a priority braking system for a vehicle, characterized in that it is configured to further include; an avoidance maneuver support step of determining if the engine is stopped under the condition that the vehicle speed is detected and selectively supplying and maintaining power to the steering wheel and the ABS by bypassing. .

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