KR20180119947A - Suddenly acceleration preventing system and method of common rail diesel vehicle - Google Patents

Abstract

The present invention relates to a system and a method for preventing a common rail diesel vehicle from being suddenly accelerated, which is capable of preventing an accident due to sudden acceleration by determining whether the sudden acceleration of the vehicle occurs based on the fuel pressure of a rail pressure sensor, a degree of accelerator pedal depression of the accelerator pedal position sensor, and whether auto cruise control is set, and causing an ECU of the vehicle to recognize the sudden acceleration of the vehicle as an error of the accelerator pedal position sensor, thereby inducing the output of an engine to be executed in a fail safe mode. The system includes a rail pressure sensor for measuring a fuel pressure of a common rail diesel vehicle; an excel position sensor for outputting the degree of depression of an accelerator pedal as first and second excel position signals (APS1 and APS2); an auto cruise control switch for selecting whether to execute an auto cruise control function that automatically maintains a vehicle speed; and a sudden acceleration control unit for analyzing the first excel position signal and an output signal of the auto cruise control switch to determine a sudden acceleration state of the vehicle, wherein the sudden acceleration control unit generates a toggle signal when determined as a sudden acceleration and mixes the toggle signal with the second excel position signal, thereby allowing the ECU to recognize it as an error in the position sensor.

Description

Technical Field [0001] The present invention relates to a sudden acceleration prevention system for a common rail diesel vehicle,

The present invention relates to a system and method for preventing sudden stoppage of a common rail diesel vehicle, and more particularly, to a system and method for preventing sudden stoppage of a common rail diesel vehicle, The ECU determines that the vehicle is suddenly accelerated and recognizes that the ECU of the vehicle recognizes the error as an error in the position sensor, (IDLE), thereby preventing accidents caused by sudden emergencies. 2. Description of the Related Art [0002] The present invention relates to a system and method for preventing a sudden stoppage of a common rail diesel vehicle.

Prior to the development of automobile electric field technology, a mechanical excel pedal device was applied. Gasoline cars and LPG cars controlled the acceleration by adjusting the opening degree of the throttle valve by a cable connected to an excel pedal. A diesel vehicle without a throttle valve was equipped with a fuel injection pump Acceleration was controlled by adjusting the amount of fuel supplied by linking with the Excel pedal cable.

In recent years, due to the development of automotive electric field technology, most automobiles are equipped with an electronic excel pedal device and an electronic control unit (hereinafter referred to as "ECU") equipped with an excel position sensor for indicating the degree of depression of the accelerator pedal.

In addition, most of the recent diesel cars are equipped with common rail engines that are efficiently driven by the ECU's electronic control system.

The ECU controls the throttle valve motor of the gasoline automobile and the LPG automobile based on the excel position sensor value to adjust the acceleration by controlling the inflow amount of air. The diesel vehicle directly controls the solenoid valve of the injector injecting the fuel, And adjusts the acceleration of the vehicle by adjusting the injection amount.

In a vehicle in which acceleration is electronically controlled by an ECU, there is a case in which there is no accelerating action of the driver, that is, a sudden start occurs when the vehicle is stopped while an accelerator pedal is not pressed, These cases are collectively referred to as sudden emergencies.

Conventional techniques for preventing such sudden vehicle accident are disclosed in the following Patent Document 1: Korean Patent Laid-Open Publication No. 10-2014-0032119 (published on Apr. 13, 2014) and Patent Document 2: Korean Patent Laid- 2012-0001370 (published on April 14, 2012) and Patent Document 3: Korean Patent No. 10-1534549 (Registered on Jul. 01, 2015).

The prior art disclosed in Patent Document 1 compares an accelerator pedal signal and a throttle detection signal received through an OBD terminal with an engine torque value to generate a separate throttle motor control signal instead of the throttle motor control signal of the ECU Thereby to limit the acceleration of the vehicle by switching the throttle module to the idle state.

Further, in the prior art disclosed in Patent Document 2, when the brake is operated in the state where the shift lever is in the D or R state by sensing the position of the accelerator pedal, the engine RPM, the brake and the shift lever, It is judged as a state of sudden emergence. The engine RPM is controlled to an idle state through the engine control device in the sudden acceleration determination state, and the automatic transmission is switched to the neutral state through the automatic transmission electronic control device to prevent the sudden acceleration.

In addition, the prior art disclosed in Patent Document 3 recognizes a sudden situation when the rate of change of the engine RPM rises above a predetermined reference value, which is coupled to an ECU of a vehicle, and outputs an excel position signal, a throttle position signal, By interrupting the pressure signal in the middle, the ECU switches to Limp Home Mode to limit the output of the engine to prevent sudden emergencies.

(Patent Document 1) Korean Published Patent Application No. 10-2014-0032119 (published on April 14, 2014) Korean Patent Publication No. 10-2012-0001370 (2012.04.04. Open) Korean Registered Patent No. 10-1534549 (Registered on July 21, 2015)

However, the above conventional techniques have the following problems.

For example, in the prior art disclosed in Patent Document 1, the sudden stopping prevention technique is applied only to a gasoline vehicle and a LPG vehicle having a throttle valve, and can not be applied to a diesel vehicle. The throttle motor control signal for controlling the throttle motor and the throttle motor control There is a problem that a separate unit for selecting a signal must be mounted.

In addition, in the prior art disclosed in Patent Document 2, an automatic transmission electronic control device for switching an automatic transmission to neutral in order to prevent a sudden stoppage has to be added, which is a real disadvantage that it is difficult to realize realization without an automobile company.

In the prior art disclosed in Patent Document 3, in order to shut off the excel position signal, the throttle position signal, and the rail pressure signal transmitted to the ECU in the event of a sudden acceleration, the vehicle sudden stop prevention system must be positioned between the received signal and the ECU, This is because, considering that the ECU of the vehicle is mostly located in the engine room and the shape varies depending on the type of vehicle, there is a problem that the manufacturing cost is increased and a high durability is required.

In addition, in the above-described prior arts, when the auto cruise control is set to automatically maintain the speed of the vehicle, the throttle valve is opened more than a predetermined angle without pressing the accelerator pedal, or the engine RPM is kept higher than a predetermined value There is a problem that the running state at the time of normal auto cruise control setting can be mistaken as a sudden state.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is therefore an object of the present invention to provide a rail-rail pressure sensor, a first excel position sensor signal and an auto cruise control signal in a common rail diesel vehicle, By comparing the signal in real time to judge the precise sudden acceleration and to induce the ECU to execute the Fail Safe Mode which limits the output of the engine to the idle without stopping the engine in the event of a sudden start, The present invention provides a system and method for preventing a sudden stop of a common rail diesel vehicle that can solve a sudden situation by controlling a vehicle.

In order to achieve the above-mentioned object, the suddenly stopping system of a common rail diesel vehicle according to the present invention includes: a rail pressure sensor for measuring the fuel pressure of a common rail diesel vehicle; An excel position sensor for outputting the degree of depression of the accelerator pedal as first and second excel position signals; An auto cruise control switch for selecting whether or not to execute an auto cruise control function that automatically maintains the speed; And a control unit for controlling the output of the rail pressure sensor, the first excel position signal and the output signal of the autocruise control switch to determine a sudden acceleration state of the vehicle, generate a toggle signal when it is determined to be a sudden acceleration, And recognizes the abnormality as an error of the position sensor of the ECU.

Also, the suddenly stopping system of the common rail diesel vehicle according to the present invention is interposed between the rail pressure sensor, the output signal of the excel position sensor and the auto cruise control switch, and the rapid acceleration control unit, And a signal extracting means for extracting an output signal of the cruise control switch and transmitting the extracted signal to the rapid-motion control unit.

Wherein the signal extracting means includes a probe at one end and is contacted with the output of the rail pressure sensor, the first excel position signal, and the autocruise control switch, and extracts each output signal.

Wherein the signal extracting means comprises a sensor contact probe contacting the output of the rail pressure sensor, the first excel position signal and the autocruise control switch; A signal cable for transmitting a probe signal from the sensor contact probe; And a module connection connector for interfacing a signal of the signal cable to a rapid-motion control unit.

Wherein the rapid acceleration control unit comprises: a signal connector for interfacing the rail pressure sensor with the output signals of the first excel position signal and the auto cruise control switch; A signal receiving unit for receiving a signal of the signal connector; A signal storage unit for storing the respective output signals received by the signal receiving unit; A sudden stop determining unit for determining a sudden state of the vehicle by analyzing an output signal stored in the signal storage unit and controlling the generation of a toggle signal if it is determined to be a sudden start; And a toggle signal generator for generating a toggle signal for recognizing the error of the Excel position sensor under the control of the sudden stop determining unit.

In order to accomplish the above object, a method of preventing a sudden acceleration of a common rail diesel vehicle according to the present invention comprises the steps of (a) detecting a rail pressure sensor signal, a first / second excel position signal and an auto cruise control (B) analyzing a rail pressure sensor signal and a first excel position signal obtained in the step (a) to preliminarily determine whether a sudden acceleration occurs; (c) (D) generating a toggle signal by controlling the toggle signal generator when the occurrence of the sudden emission is finally determined in the step (c); (e) mixing the generated toggle signal with a second excel position signal and recognizing the extinguishing signal as an excel position sensor error in the ECU.

In the step (a), the rail pressure sensor signal, the first excel position signal, and the auto cruise control signal are obtained at predetermined time intervals.

In the step (b), if the first excel position signal is less than a preset reference value, it is determined that the accelerator pedal is not pressed. If the rail pressure sensor signal is equal to or greater than a preset reference value, .

In the step (b), if the number of times of discrimination of the abnormal driving state is 0, it preliminarily discriminates as a normal driving state. If the number of times of discrimination of the abnormal driving state is one or more and is less than a predetermined number, If the number of times of discrimination is equal to or greater than a predetermined number of times, preliminarily discriminates the state of occurrence of a sudden acceleration.

In the step (c), when the value of the most recent autocruise control signal is ON, the cruise control signal is finally determined to be in the normal traveling state regardless of the driving state determined in the step (b) (OFF), the driving state determined in the step (b) is determined as the final driving state.

According to the present invention, when a sudden occurrence occurs in a common rail diesel vehicle, the ECU instructs the ECU to execute a fail safe mode in which the output of the engine is limited to an idle so that the driver can safely control the vehicle to solve the sudden situation There is an advantage to be able to help.

In addition, the present invention is applicable to all common rail diesel vehicles equipped with an electronic excel pedal device and an ECU by applying a method of outputting a toggle signal as a second excel position signal in order to control a sudden acceleration.

Further, the present invention is advantageous in that it is possible to determine a precise sudden acceleration by finally determining occurrence of a sudden start by using an auto cruise control signal of a vehicle.

In addition, the present invention is advantageous in that the rapid-motion control unit can be manufactured as a small module and can be easily mounted in a vehicle regardless of its position in a room.

Further, the present invention has an advantage in that each sensor of the vehicle can be connected to the rapid-motion control unit simply by using signal extracting means having a probe.

1 is a block diagram of a suddenly stopping system for a common rail diesel vehicle according to a preferred embodiment of the present invention.
FIGS. 2A and 2B are exemplary views of signal extracting means for extracting a sensor signal of a vehicle according to the present invention;
FIGS. 3A and 3B are views showing an example of a combination of an excel position sensor connector of a vehicle and a signal extracting means in the present invention;
FIG. 4 is a diagram illustrating an output example of an Excel position sensor applied to the present invention,
FIG. 5 is a diagram illustrating a rail pressure sensor signal and a first excel position signal graph during normal traveling of a common rail diesel vehicle for explaining the present invention.
FIG. 6 is an exemplary diagram of a rail pressure sensor signal and a first excel position sensor signal graph when a sudden power generation occurs in a common rail diesel vehicle for explaining the present invention;
FIG. 7 is a flowchart illustrating a method of preventing a sudden stop of a common rail diesel vehicle according to a preferred embodiment of the present invention.
FIG. 8 is a flowchart showing an example of a vehicle operation state preliminary determination process in FIG. 7; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a system and method for preventing sudden stop of a common rail diesel vehicle according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a suddenly stopping system of a common rail diesel vehicle according to a preferred embodiment of the present invention.

As shown in FIG. 1, the suddenly stopping system of a common rail diesel vehicle according to the present invention includes an auto cruise control switch 120, a rail pressure sensor 130, an excel position sensor 140, a signal extracting means 110, And a rapid-motion control unit 100.

1, reference numeral 200 denotes a vehicle control unit (ECU) provided in a vehicle.

The auto cruise control switch 120 is a switch for selecting whether or not to execute an auto cruise control function that automatically maintains a speed and is a switch for selecting an on state and an off state . The on state means executing the autocruise control function, and the off state means canceling the autocruise control function.

The rail pressure sensor 130 measures the fuel pressure of the common rail diesel vehicle, and the excel position sensor 140 senses the degree of depression of the excel pedal.

Here, as shown in FIG. 4, the excel position signal has a voltage range of 0 to 5 V according to the pedal stroke of the excel pedal. Two excel position signals (the first excel position signal APS1 and the second excel position signal APS2) are generated by the excel position sensor. The vehicle control unit (ECU) 200 adds the two Excel position signals and recognizes them as an Excel position signal.

The auto-cruise control switch 120, the rail pressure sensor 130, and the excel position sensor 140 are electrical components that are essentially required for a common rail diesel vehicle.

The signal extracting means 110 is interposed between the output signals of the rail pressure sensor 130, the excel position sensor 140 and the auto cruise control switch 120 and the rapid acceleration control unit 100, Extracts the output signals of the sensor 130, the excel position sensor 140 and the auto cruise control switch 120, and transmits the extracted signals to the rapid control section 100.

The signal extracting means 110 is provided with a probe at one end and contacts the output portions of the rail pressure sensor 130 and the first excel position signal APS1 and the auto cruise control switch 120 to output respective output signals It is preferable to extract it.

2A and 2B, the signal extracting means 110 includes a sensor contact probe 130 which contacts the output portion of the rail pressure sensor 130, the excel position sensor 140 and the autocruise control switch 120, A signal cable 112 for transmitting a probe signal from the sensor contact probe 111 and a module connection connector 113 for interfacing a signal of the signal cable 112 to the rapid acceleration control unit 100 do.

In the present invention, the sensor contact probe 111 is implemented in the form of FIG. 2A and in the form of a clamp as shown in FIG. 2B. However, the present invention is not limited to this. The sensor output signal of the vehicle control unit (ECU) may be input to the sensor input terminal of the vehicle controller (ECU) It will be apparent to those skilled in the art that various types of probes capable of extracting signals can be included.

The suddenly driving control unit 100 analyzes the auto cruise control signal, the output signal of the rail pressure sensor, and the first excel position signal APS1 to determine a sudden driving state of the vehicle. If the sudden driving state is determined, Generates a signal and mixes it with the second excel position signal APS2 to recognize the excel position sensor error in the ECU 200. [

It is preferable that the rapid-motion control unit 100 is manufactured as a small-sized module that can be manufactured in a size smaller than the size of a credit card. The signal generation unit 101, the signal storage unit 102, the sudden-discharge determination unit 103, 104 and a signal connector 105.

The output signals of the auto cruise control switch 120, the rail pressure sensor 130 and the excel position sensor 140 of the vehicle are connected to the signal connector 105 of the rapid acceleration control unit 100 through the signal extracting means 110 .

The signal receiving unit 101 reads the auto cruise control signal, the rail pressure signal and the excel position signals APS1 and APS2 of the vehicle inputted through the signal connector 105 at predetermined time intervals and outputs a dual auto cruise control signal, The rail pressure signal and the first excel position signal APS1 are transmitted to the signal storage unit 102. The second excel position signal APS2 is used only for checking whether the rapid acceleration control unit 100 and the vehicle's excel position sensor 140 are normally connected by the signal extracting unit 110. The signal exiting unit 102 ). It is desirable that the time period of reading the signal should not exceed a maximum of 0.2 seconds in order to minimize the error of the received signal graph slope and the actual signal graph slope.

Here, the auto-cruise control signal, the rail pressure signal, and the first excel position signal have a voltage range of 0V to 5V, and the second excel position signal has a voltage range of 0V to 2.5V.

The signal storage unit 102 stores the auto cruise control signal, the rail pressure signal, and the first excel position signal transmitted from the signal receiving unit 101 in the internal memory, and the appropriate time range for storing the signal is 2 seconds to 2.5 seconds Setting.

Here, the signal storage unit 102 removes signals stored in the oldest number position in the internal memory at the time of signal storage, and stores the data using the first-in first-out method in which the remaining number of stored signals are moved to the previous position one time and stored . By storing the new signals transmitted from the signal receiving unit 101 at the most recent number of positions, only the signals within the last 2 seconds to 2.5 seconds are always kept in the internal memory.

The sudden stop determining unit 103 examines all the signals stored in the internal memory by the signal storing unit 102 at each signal receiving period of the signal receiving unit 101 to determine whether a sudden stoppage has occurred. The first excel position signal APS1 is checked to check whether the excel pedal is not pressed. At this time, the rail pressure signal is inspected to check whether the fuel pressure in the common rail is excessively high, . Here, it is assumed that the reference value for the fuel pressure in the common rail is set in advance, and it is preferable that the reference value is used as it is by the stable fuel pressure in the normal common rail diesel vehicle. Next, it is determined whether the auto-cruise control signal is maintained in the OFF state for a time period that is preliminarily determined to be in a suddenly-generated state, and it is finally determined whether or not the sudden -generation occurs.

Here, the reference value of the first excel position signal, which determines the state where the excel pedal is not pressed, is not a fixed signal value in consideration of the difference of the idle state signal value of the excel position sensor for each vehicle maker, vehicle type, and model year A value of about 0.15 V, which is a 3% level of the entire signal range, is added to the lowest value of the received first excel position signals. If the first excel position signal is less than the reference value, it is determined that the excel pedal is not pressed desirable.

In addition, the reference value of the rail pressure signal, which determines the excessive state of the fuel pressure when the pedal is not depressed, is set at about 3.5 V which is the 70% level of the entire signal range. If the rail pressure signal is above this reference value, It is preferable to determine that a high output of the engine has occurred.

As a result of the inspection, the time when the number of inspections judged to be the engine high output is multiplied by the signal receiving period is regarded as the engine high output holding time. If the time is longer than a predetermined time (about 1 second) The final decision is made as to whether the vehicle is in the auto cruise setting state or not.

The toggle signal generating unit 104 generates a toggle signal of 3.3V from the time when the sudden acceleration determining unit 103 determines the state of occurrence of the sudden acceleration and determines that the normal driving state is determined by the sudden acceleration determining unit 103 The generation of the toggle signal continues until the time point.

The toggle signal output line is connected to the second excel signal line input to the signal extracting means 110, and the toggle signal output line is connected to the second excel signal line , So that the toggle signal is introduced (or mixed) into the second excel position signal of the vehicle.

The toggle signal output line during the generation of the toggle signal preferably outputs a 3.3V signal only in the High section of the toggle signal period and is switched to the floating state during the Low section to minimize the influence on the Excel position sensor.

When the steady-state driving state is finally determined by the suddenly driving determination unit 103, the toggle signal output line of the toggle signal generating unit 104 is switched to the floating state in order to protect the excel position sensor circuit.

FIGs. 2A and 2B are exemplary views of a signal extracting means for receiving a sensor signal of a vehicle according to a preferred embodiment of the present invention, and FIGS. 3A and 3B are diagrams showing a relationship between an excel position signal connector of a vehicle according to a preferred embodiment of the present invention, 2a and Fig. 2b.

A method of connecting the vehicle position sensor and the rapid-motion control unit 100 according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 2A to 3B.

As shown in FIGS. 2A and 2B, the signal extracting means 110 includes a sensor contact probe 111, a signal cable 112, and a module connection connector 113.

The signal extracting means 110 may be fabricated in the form of FIG. 2A or FIG. 2B depending on the shape of the sensor contact probe 111.

2A is equipped with a sensor contact probe 111 of a needle shape having a thickness of 1 mm or less and the sensor contact probe 111 is connected to a metal crimping portion of a sensor cable end connected to the vehicle sensor connector Can be contacted.

3A, the signal extracting means 110 vertically inserts the sensor contact probe 111 into the entrance of the Excel position sensor cable in the upper portion of the vehicle's Excel position sensor connector, So that it can be connected to the excel position sensor.

The signal extracting means 110 shown in FIG. 2B is equipped with a sensor contact probe 111 in the form of a small clip, and the vertical needle portion in the clip of the sensor contact probe 111 penetrates the covering of the vehicle sensor cable vertically May be in direct contact with the inner conductor.

3B, the signal extracting means 110 shown in FIG. 2B spreads the clip portion of the sensor contact probe 111 and presses it vertically on the excel position sensor cable at the upper portion of the excel position sensor connector, Can be connected to the sensor.

3 is an example of a connector mounted on a vehicle. Since the shape and position of a sensor connector mounted on a vehicle are various, the signal extracting means 110 of FIG. 2A or FIG. It is desirable to increase the convenience of connection with the vehicle sensor.

FIG. 5 is a graph showing a rail pressure signal and a first excel position signal during normal running of a common rail diesel vehicle for explaining the present invention. Signal and a first Excel position signal graph.

In the graphs of FIGS. 5 and 6, the rail pressure signal is represented by a red curve and the first Excel position signal is represented by a blue curve. The horizontal axis of the graph represents time and the vertical axis represents a signal range of 0 V to 5 V.

5 and 6, the rail pressure signal in the steady running state changes in proportion to the first excel position signal as shown in the graph of FIG. 5, and the rail pressure signal in the suddenly- Although the first excel position signal maintains the idle state (about 0.74 V), as shown in the circled region in the graph, it rises steeply in a short time to reach a high Value.

A system for preventing sudden stoppage of a common rail diesel vehicle according to a preferred embodiment of the present invention uses a proportional relationship between a rail pressure signal and a first excel position signal to determine a normal driving state and a sudden acceleration state of the vehicle, A method for controlling this will be described in detail with reference to FIGS. 7 and 8. FIG.

FIG. 7 is a flowchart for explaining steps of preventing a sudden stoppage of a common rail diesel vehicle according to a preferred embodiment of the present invention, and FIG. 8 is a flowchart illustrating details of the vehicle driving state preliminary determination step shown in FIG.

As shown in FIG. 7, a method of preventing sudden acceleration of a common rail diesel vehicle according to a preferred embodiment of the present invention includes an auto cruise control signal of a vehicle inputted through a signal extracting means 110 connected to a sudden acceleration control unit 100, The pressure signal and the excel position signals APS1 and APS2 are read by the signal receiving unit 101 every predetermined time period (S10).

At this time, the signal receiving unit 101 checks whether each signal is in the normal range and determines whether the signal extracting unit 110 is normally connected to the sensor of the vehicle.

Next, the signal storage unit 102 stores the auto cruise control signal, the rail pressure signal, and the excel position signal APS1 transmitted from the signal receiving unit 101 in the internal memory (S11).

Next, the sudden stop determining unit 103 analyzes the rail pressure signal and the excel position signal APS1 stored in the internal memory and performs preliminary discrimination on the driving state of the vehicle (S12).

The preliminary discrimination of the vehicle running state starts from the step of resetting the number of abnormal driving state discrimination as shown in FIG. 8 (S30). Then, the suddenly determining unit 103 determines whether the excel position signal APS1 is less than a preset value, and determines that the excel position signal APS1 has not been depressed when the value is less than the preset value (S31). If it is determined in step S31 that the accelerator pedal is not depressed, the suddenly driving determination unit 103 goes to step S32 to check whether the rail pressure signal is greater than or equal to a predetermined value, It is determined that the output of the engine is excessive. If all of the results of the above steps S31 and S32 are satisfied, the sudden stop determination unit 103 increments the number of abnormal driving determinations by one (S33). Next, after the step S33, the rapid navigation determiner 103 increases the number of signal inspections and checks whether the signal storage unit 102 is equal to the total number of times the signal storage unit 102 stores the signal (S34). If the result of the check in step S34 is not satisfied, steps S31 to S34 described above are repeated. After the abnormal driving state determination is completed by the number of times of storing the entire signal, it is determined whether the number of abnormal driving state determination times is equal to or greater than a predetermined value (S35). If the result of the check in step S35 is satisfied, it is determined that the output of the engine is excessively generated for a time period obtained by multiplying the number of times of the abnormal driving state determination by the signal receiving period, so that the running state of the vehicle is determined as a sudden acceleration occurrence state, The preliminary determination is ended (S36). On the other hand, if the result of the check in step S35 is not satisfied, it is determined whether the number of times the abnormal operating state is discriminated is one or more (S37). If the result of the check in step S37 is satisfied, it is determined that it is difficult to distinguish whether the rail pressure signal is a falling delay phenomenon in a rapid deceleration state or a start phenomenon in a sudden acceleration state in a high power state of the engine. It is determined that the vehicle is suddenly in an ambiguous state, and the preliminary determination of the vehicle driving state is ended (S38). If the result of the check in step S37 is not satisfied, it is determined that the output of the engine is normal at the time of all the signals stored in the signal storage unit 102 to determine the running state of the vehicle as a normal running state, (Step S39).

On the other hand, if it is determined in step S12 that the preliminary determination of the vehicle driving state is completed, the process proceeds to step S13 to check whether the auto cruise control signal is OFF. If the auto cruise control signal is ON, the vehicle sudden acceleration determination process is terminated. On the other hand, if the auto-cruise control signal is in the off-state, the process proceeds to step S14 to check whether or not the vehicle is in a sudden-acceleration state.

If it is determined in the step S14 that the vehicle is in a state of sudden emergence based on the result of preliminarily discriminating the vehicle driving state, the process proceeds to step S15 and the suddenly driving determination unit 103 finalizes the state of occurrence of the sudden emergence (S15).

On the other hand, if at least one of the results of the tests at the steps S13 and S14 is not satisfied, the suddenly driving determination unit 103 finally determines the normal running state and moves to step S20 for checking the vehicle starting OFF state.

Immediately after the vehicle running state is finally determined by the suddenly determining unit 103 as a suddenly generated state in step S15, the toggle signal generating unit 104 generates a 3.3V toggle signal of 100 Hz to 200 Hz per second and outputs an Excel position signal APS2 ) Line (S16).

The toggle signal thus outputted is mixed with the excel position signal APS2 so that the ECU 200 is finally recognized as an excel position sensor error.

For example, as in step S17, the ECU 200 of the vehicle recognizes the 3.3V toggle signal appearing in the excel position signal APS2 as an excel position sensor error. Then, when the state of the step S17 continues to exceed the error detection time of the Excel position sensor (about 0.5 to 1 second), the vehicle ECU 200 judges that the excel position sensor is out of order, The fail safe mode is executed (S18). The engine output of the vehicle is limited to the idle after the ECU 200 is in the closed-safe mode, and no vehicle error or acceleration due to the driver's operation of the accelerator pedal operates (S19).

After the step S19, the sudden-discharge control unit 100 checks the start-up OFF state of the vehicle. When the start-up state is determined to be OFF, the sudden-injection test and control process is terminated (S20).

If it is determined in step S20 that the starting is ON, the rapid acceleration control unit 100 repeats steps S10 to S20.

Through the above process, the present invention accurately determines whether or not a sudden acceleration is generated by using a rail pressure signal, an excel position signal APS1 and an auto cruise control signal of a common rail diesel vehicle, (APS2) line so that the ECU of the vehicle recognizes it as an error in the position sensor, and accordingly, the ECU of the vehicle executes the closed-day safe mode in which the engine output is fixed to the idle state to prevent accidents It will be possible.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is obvious to those who have.

The present invention is applied to a technique for preventing sudden emergence in a common rail diesel vehicle and automatically controlling the vehicle to travel in a closed-day safe mode when it is determined that the vehicle is suddenly driven, thereby achieving safety.

100:
101:
102: Signal storage unit
103:
104: toggle signal generating unit
105: Signal connector
110: signal extracting means
111: Sensor contact probe
112: Signal cable
113: Module connection connector
120: Auto cruise control switch
130: Rail pressure sensor
140: Excel position sensor

Claims (10)

A system for preventing sudden emergencies in a common rail diesel vehicle,
A rail pressure sensor for measuring the fuel pressure of a common rail diesel vehicle;
An excel position sensor for outputting the degree of depression of the excel pedal to first and second excel position signals APS1 and APS2;
An auto cruise control switch for selecting whether to execute an auto cruise control function that automatically maintains vehicle speed;
And a control unit for controlling the output of the rail pressure sensor, the first excel position signal and the output signal of the autocruise control switch to determine a sudden acceleration state of the vehicle, generate a toggle signal when it is determined to be a sudden acceleration, And detecting an abnormality in the ECU as an error in the position sensor of the common rail diesel engine.
The output signal of the rail pressure sensor, the output signal of the excel position sensor and the auto cruise control switch is interposed between the output signal of the rail pressure sensor, the excel position sensor and the auto cruise control switch, And a signal extracting means for transmitting the extracted signal to the control unit.
The signal extracting device according to claim 2, wherein the signal extracting means has a sensor contact probe at one end, and contacts the output portion of the rail pressure sensor, the first excel position signal and the auto cruise control switch to extract each output signal Suddenly preventing system of common rail diesel vehicle.
The system according to claim 2 or 3, wherein the signal extracting means comprises: a sensor contact probe in contact with the rail pressure sensor and the output portion of the first excel position signal and the autocruise control switch; A signal cable for transmitting a probe signal from the sensor contact probe; And a module connection connector for interfacing a signal of the signal cable to a rapid-motion control unit.
[2] The vehicle steering system of claim 1, wherein the suddenly driving control unit comprises: a signal connector for interfacing the output signal of the first excel position signal and the auto cruise control switch with the rail pressure sensor; A signal receiving unit for receiving a signal of the signal connector; A signal storage unit for storing the respective output signals received by the signal receiving unit; A sudden stop determining unit for determining a sudden state of the vehicle by analyzing an output signal stored in the signal storage unit and controlling the generation of a toggle signal if it is determined to be a sudden start; And a toggle signal generator for generating a toggle signal for recognizing the error of the excel position sensor under the control of the sudden acceleration determiner.
A method for preventing sudden emergence in a common rail diesel vehicle,
(a) obtaining a rail pressure sensor signal, a first / second excel position signal and an autocruise control signal for sudden acceleration determination of the vehicle,
(b) analyzing the rail pressure sensor signal and the first excel position signal obtained in the step (a) to preliminarily determine whether a sudden acceleration occurs,
(c) finally determining whether a sudden onset occurs in accordance with the auto cruise control signal,
(d) generating a toggle signal by controlling the toggle signal generator when the occurrence of the sudden emission is finally confirmed in the step (c); And
(e) mixing the generated togloil signal with a second excel position signal to recognize the extinguished torque signal as an excel position sensor error in the ECU.
The method of claim 6, wherein the step (a) acquires the rail pressure sensor signal, the first excel position signal, and the auto cruise control signal at predetermined time intervals.
[6] The method of claim 6, wherein the step (b) determines that the first pedal position signal is below the predetermined reference value and determines that the pedal pedal is not depressed. If the pedal pressure signal is greater than a preset reference value, And accumulating the number of times of the damping of the common rail diesel vehicle.
The method as claimed in claim 6 or claim 8, wherein, in the step (b), if the number of times of discrimination of the abnormal driving state is 0, it is preliminarily discriminated as the normal driving state. If the number of the abnormal driving state determination is one or more, And if the number of abnormal driving state determination times is equal to or greater than a preset number of times, preliminarily discriminates the state of occurrence of a sudden acceleration in the common rail diesel vehicle.
[6] The method of claim 6, wherein the step (c) further comprises: if the value of the most recent autocruise control signal is ON, the cruise control signal is finally determined to be in a normal driving state regardless of the driving state determined in the step (b) And when the value of the control signal is OFF, the driving state determined in the step (b) is determined as the final driving state.

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