WO2009146605A1

WO2009146605A1 - A vehicle rollover safety monitoring method

Info

Publication number: WO2009146605A1
Application number: PCT/CN2009/000621
Authority: WO
Inventors: 曾灵参
Original assignee: Zeng Lingshen
Priority date: 2008-06-05
Filing date: 2009-06-03
Publication date: 2009-12-10
Also published as: CN101362454B; CN101362454A

Abstract

A vehicle rollover safety monitoring method, this method can protect the occupant in time after the vehicle rollover, this method use pressure sensors disposed at the supporting positions of all the wheels to monitor the real time pressure of wheels relative to the ground, and compares the pressure values with a safety critical point, thus judges whether the vehicle is in a dangerous state. And the safety measures will be adopted if the judged result is that the vehicle is in the dangerous state.

Description

Vehicle overturning safety monitoring method

Technical field

The invention relates to a vehicle monitoring method, in particular to a vehicle overturning safety monitoring method capable of timely protecting a vehicle inside a vehicle after being overturned.

Background technique

Safety devices for various vehicles are generally equipped with airbags, and the airbags are only opened when the vehicle is subjected to a violent impact. However, sometimes the vehicle is not subjected to impact but is in other dangerous situations, such as falling from a high altitude, rolling over, etc. In this case, the general safety device cannot protect the personnel in the vehicle in a timely and effective manner, resulting in a low safety factor of the safety device. . Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to overcome the deficiencies of the above-mentioned background art and to provide a vehicle overturning safety monitoring method for issuing a safety warning signal when the vehicle is not subjected to an impact and is in a dangerous state such as vacating, so that it can be impacted. Before the vehicle is judged to be in a dangerous state, and the protection measures are taken in advance.

In order to achieve the above object, the present invention provides two vehicle overturning safety monitoring methods for different types of vehicle selection.

The vehicle overturning safety monitoring method provided by the invention comprises the following steps:

(1) Pressure monitoring of all wheels of the vehicle;

(2) Collecting the real-time pressure value uploaded by the wheel;

(3) Adding the real-time pressure data obtained from all the wheels to determine whether the added data is greater than the set safety critical point. If it is greater than the safety critical point, the vehicle is in a safe state; if it is less than or equal to the safety threshold The vehicle is in a dangerous state; wherein the safety critical point is a fixed value corresponding to the vehicle of different models, and the range is smaller than the When the model vehicle is unloaded at a constant speed of 100 km/h on a 45° slope, the total pressure of all the wheels on the ground is the minimum total pressure of the vehicle on the ground during normal driving, and is greater than that of the vehicle at a standstill, and is lifted off the ground by a crane or the like. The sum of all wheel pressures measured by the pressure sensor on the vehicle is the total pressure of all the wheels when the vehicle is stationary.

(4) If the result of the judgment is that the vehicle is in a safe state, the safety device on the vehicle is not triggered, and the pressure monitoring of all the wheels is continued;

(5) If the result of the judgment is that the vehicle is in a dangerous state, the real-time pressure value uploaded by the wheel is collected again at intervals, and the real-time pressure value and safety critical value uploaded by the wheel are again used by the comparison judgment method described in step (3). The point is judged and compared again in the same judgment cycle to determine whether the vehicle is in a safe state; the process of collecting data for comparison after a period of time is performed at least twice in the same judgment cycle, and if the judgment result is that the vehicle is in a safe state, then Triggering the safety device on the vehicle, restarting a new round of judgment cycle; if the last judgment result is that the vehicle is in a dangerous state, a pulse signal is sent to the safety device of the vehicle to trigger the safety device.

Another vehicle overturning safety monitoring method provided by the present invention comprises the following steps:

(1) Pressure monitoring of all wheels of the vehicle;

(2) Collecting the real-time pressure value uploaded by the wheel;

(3) Add the real-time pressure data obtained from the wheel on one side of the vehicle to determine whether the added data is greater than half of the set safety critical point.

A. If less than or equal to half of the safety critical point, the vehicle is in a dangerous state;

B. If it is greater than half of the safety critical point, add the real-time pressure data obtained from the other side of the vehicle.

a. If still greater than half of the safety critical point, the vehicle is in a safe state, b. if less than or equal to half of the safety critical point, the vehicle is in a dangerous state;

The safety critical point is a fixed value corresponding to the vehicle of different models, and the range is smaller than the total pressure of all the wheels on the ground when the vehicle is at a constant speed of 100 km/h at a constant speed of 100 km/h, that is, the vehicle pair during normal driving. The minimum total pressure of the ground, and greater than the total pressure of all the wheel pressures measured by the pressure sensor on the vehicle when the vehicle is lifted off the ground by a crane or the like in a stationary state, that is, the total pressure of all the wheels when the vehicle is stationary.

(5) If the result of the judgment is that the vehicle is in a dangerous state, the real-time pressure value uploaded by the wheel is collected again at intervals, and the real-time pressure value and safety critical value uploaded by the wheel are again used by the comparison judgment method described in step (3). Half of the points are compared and judged in the same judgment cycle to determine whether the vehicle is in a safe state. The process of collecting data for comparison for a period of time is performed at least twice in the same judgment cycle. If the judgment result is that the vehicle is in a safe state, Then, the safety device on the vehicle is not triggered, and a new round of judgment cycle is restarted; if the last judgment result is that the vehicle is in a dangerous state, a pulse signal is sent to the safety device of the vehicle to trigger the safety device.

In the above two schemes, in step (1), the pressure monitoring of the wheel is performed by using a pressure sensor disposed on all wheel support portions of the vehicle, and all of the pressure sensors are respectively connected to the AD input end of the pressure monitor, the pressure monitor The output end is connected to the base of the triode through a resistor, and the emitter of the triode is connected to the trigger point of the safety device, and the collector of the triode is connected to the power supply via a voltage stabilizing circuit.

In both of the above schemes, the interval time can be set to be between 190 mm and 300 mm.

In the above two solutions, the safety device of the vehicle is an airbag. The vehicle overturning safety monitoring method according to the present invention is applicable to various types of vehicles, and has the advantages of wide application range, convenient operation, high sensitivity and high reliability, and particularly real-time monitoring of pressure on all wheels or one side of the vehicle. It can detect the dangerous state of the vehicle at any time, such as vacating or overturning. Therefore, it can judge whether the vehicle is in a dangerous state before the vehicle is hit, that is, the vehicle is in a dangerous situation of overturning or falling, so that protective measures can be taken in advance, and effective protection is provided. The safety of personnel. In addition, since the invention adopts a method of judging whether the vehicle is in a dangerous state, it can effectively avoid the situation that the vehicle is misjudged when the vehicle is in normal vacancy, and has high fault tolerance and reliability. It is also easy to adjust the sensitivity by using the delay multiple times. DRAWINGS

1 is a flow chart of a small vehicle monitoring method for a vehicle overturning safety monitoring method according to the present invention.

2 is a flow chart of a method for monitoring a small vehicle according to the vehicle overturning safety monitoring method of the present invention.

Fig. 3 is a flow chart showing the procedure of a large vehicle monitoring method for the vehicle overturning safety monitoring method of the present invention.

4 is a flow chart of a method for monitoring a large vehicle in a vehicle overturning safety monitoring method according to the present invention.

FIG. 5 is a schematic diagram of a safety system connection according to a specific embodiment of a vehicle overturning safety monitoring method according to the present invention.

6 is a circuit schematic diagram of a pressure monitor portion of a specific embodiment of a vehicle overturning safety monitoring method according to the present invention.

detailed description It is indicated that the possibility that all the wheels of the small vehicle are off the ground when the vehicle is in a dangerous state during actual driving is greater than the possibility that one wheel of the vehicle is off the ground, that is, all the wheels of the small vehicle are far from the ground, and the possibility of falling for a lifetime is greater. Large vehicles are just the opposite. When a danger occurs, the possibility that the wheel of one side of the large vehicle is off the ground is greater than the possibility that all the wheels of the vehicle are off the ground, that is, the wheel of one side of the large vehicle is off the ground, and the possibility of overturning is greater. Therefore, the present invention adopts two security monitoring methods for the above two different types of vehicles.

The first type of vehicle overturning safety monitoring method for small vehicles is as follows:

As shown in FIGS. 5 and 6, the first pressure sensor D1, the second pressure sensor D2, the third pressure sensor D3, and the fourth pressure sensor D4 are respectively disposed at the support portions of the left front, left rear, right front, and right rear wheels of the vehicle. The wheel is pressure monitored. The four pressure sensors are respectively connected to the four A/D input terminals EH of the pressure monitor M. The output of the pressure monitor M is connected to the base of the transistor Q1 via the resistor R1, and the emitter of the three-stage tube Q1 is The trigger point of the safety device S is connected, and the collector of the transistor Q1 is connected to the power source via a voltage stabilizing circuit composed of a resistor R2 and a diode T1. The pressure monitor M is also connected with two peripheral circuits: a clock circuit and a reset circuit. The clock circuit is composed of a crystal oscillator F and two small capacitors Cl and C2 for generating a clock frequency. The reset circuit is composed of a resistor R3 and capacitors C4 and C3. And the switch SW2 is composed for generating a reset signal. As shown in FIG. 6, a manual switch K can also be provided between the emission set of the transistor Q1 and the trigger point of the safety device S. Because in some special cases, the vehicle overturning safety sensing system needs to be turned off or detected, for example, vehicle maintenance, so a manual switch is added to each system to manually turn off the monitoring system under special circumstances, but pay attention to manual The switch should not be installed in an overly exposed and convenient position Explain the book, otherwise the accident may occur when the accident occurs due to personnel panic or other reasons.

The above-mentioned pressure monitor M is a micro-control chip with at least four A/D input channels, and the micro-control chip contains a specific safety monitoring program. As shown in FIG. 1 , the software design of the small vehicle falling-off vehicle overturning safety monitoring method is shown. The program flow is - the first step after the pressure monitor is turned on;

The second step collects real-time data on all pressure sensors;

The third step adds the real-time data obtained from the four pressure sensors;

The fourth step determines whether the added data is greater than a set safety critical point. If it is greater than the safety critical point, return to the first step, if it is less than or equal to the safety critical point, continue to the next step;

The fifth step is to delay, that is, to be separated for a period of time;

The sixth step is the interrupt service. The program flow is shown in Figure 2:

(1) CPU open interrupt in the micro control chip,

(2) Collect real-time data on all pressure sensors,

(3) Add real-time data from the four pressure sensors,

(4) Determine whether the added data is greater than the set safety critical point. If the resetting operation is greater than the safety critical point, if it is less than or equal to the safety critical point, the operation is interrupted and the next step is continued;

The seventh step sends a digital pulse signal to the safety device of the vehicle, and connects the control circuit of the safety device to trigger the safety device. The safety critical point described in the above program flow is a fixed value according to the corresponding setting of the vehicle of different models, and the range is smaller than the total of all the wheels to the ground when the vehicle is unloaded at a constant speed of 100 km/h at a constant speed of 100 km/h. The pressure is the minimum total pressure of the vehicle on the ground during normal driving, and greater than the sum of all the wheel pressures measured by the pressure sensor on the vehicle when the vehicle is lifted off the ground by a crane or the like at rest, that is, when the vehicle is stationary. The total pressure of the wheel.

Second, the vehicle overturning safety monitoring method for large vehicles is as follows:

As shown in FIGS. 5 and 6, the first pressure sensor D1, the second pressure sensor D2, the third pressure sensor D3, and the fourth pressure sensor D4 are respectively disposed at the support portions of the left front, left rear, right front, and right rear wheels of the vehicle. The wheel is pressure monitored. The four pressure sensors are respectively connected to the four A/D input terminals E-H of the pressure monitor M. The output of the pressure monitor M is connected to the base of the transistor Q1 via the resistor R1, and the three-stage tube Q1 is emitted. The pole is connected to the trigger point of the safety device S, and the collector of the transistor Q1 is connected to the power source via a voltage stabilizing circuit composed of a resistor R2 and a diode. The pressure monitor M is also connected with two peripheral circuits: a clock circuit and a reset circuit. The clock circuit is composed of a crystal oscillator F and two small capacitors Cl and C2 for generating a clock frequency. The reset circuit is composed of a resistor R3 and capacitors C4 and C3. And switch

SW2 is composed to generate a reset signal. As shown in Fig. 6, a manual switch K can also be provided between the emission set of the transistor Q1 and the trigger point of the safety device S.

The above-mentioned pressure monitor Μ is a micro-control chip with at least four A/D input channels, and the micro-control chip contains a specific safety monitoring program. As shown in FIG. 3, the software design of the overturning vehicle overturning safety monitoring method for large vehicles The program flow is:

The first step of the pressure monitor is first reset after being turned on; The second step of the manual collects real-time data on all pressure sensors;

The third step adds the real-time data obtained from the two left pressure sensors; the fourth step determines whether the added data is greater than half of the set safety critical point, and if it is greater than half of the safety critical point, the next step is continued. If it is less than or equal to half of the safety critical point, proceed to the seventh step;

The fifth step adds the real-time data obtained from the two right pressure sensors; the sixth step determines whether the added data is greater than half of the set safety critical point, and if it is greater than half of the safety critical point, returns to the first One step, if it is less than or equal to half of the safety critical point, continue to the next step;

The seventh step is to delay, that is, to be separated for a period of time;

The eighth step interrupt service, the program flow is shown in Figure 4:

(1) CPU open interrupt in the micro control chip,

(2) Collect real-time data on all pressure sensors,

(3) adding the real-time data obtained from the two left pressure sensors,

(4) Determine whether the added data is greater than half of the set safety critical point. If it is greater than half of the safety critical point, the process continues to be interrupted. If it is less than or equal to half of the safety threshold, the operation returns.

(5) adding the real-time data obtained from the two right pressure sensors,

(6) judging whether the added data is greater than half of the set safety critical point. If the reset operation is greater than half of the safety critical point, if it is less than or equal to half of the safety critical point, the operation is interrupted and the next step is continued. The ninth step of the manual transmits a digital pulse signal to the safety device of the vehicle, and connects the control circuit of the safety device to trigger the safety device.

In the program flow of the above-mentioned large vehicle overturning safety monitoring method, the third step and the fifth step flow may be interchanged. If the two are sequentially replaced, the corresponding steps (3) and (5) in the interrupt service program flow are also To change the order.

The safety critical point described in the above program flow is a fixed value according to the corresponding setting of the vehicle of different models, and the range is smaller than the total of all the wheels to the ground when the vehicle is loaded at a speed of 100 km/h at a speed of 100 km/h. The pressure is the minimum total pressure of the vehicle on the ground during normal driving, and greater than the sum of all the wheel pressures measured by the pressure sensor on the vehicle when the vehicle is lifted off the ground by a crane or the like at rest, that is, when the vehicle is stationary. The total pressure of the wheel.

In the above two types of vehicle overturning safety monitoring methods, the design interrupt service is to collect data again after a period of time to judge, and the real-time pressure on the wheel is sampled twice or more in a complete judgment program, thereby safety criticality. The purpose of multiple comparison judgments is to consider that there may be a very short vacant time during normal driving, so it is possible to avoid false judgments by two or more values, and enhance the pressure monitor. Fault tolerance. On the other hand, the design interrupt service control interval time can also be used to adjust the specific time of the entire monitor sensitivity. Under normal circumstances, the normal vacant height of the vehicle is 20cm - 50cm. According to the free fall law H = gt * t / 2, the normal vacant time of the vehicle can be estimated to be between 202ms and 319ms, while the sensitivity of the general pressure sensor is 20ms. To achieve the accuracy of the monitoring, the sensitivity of the monitor should be made = vehicle vacancy time + sensitivity of the pressure sensor. Therefore the sensitivity of the monitor is controlled at Description

230ms-340ms is better, and the error is about 1ms. The specific sensitivity of the monitor is calculated as: monitor sensitivity = 2 X sensor sensitivity + operation time + delay. Since the sensor sensitivity and operation time are relatively fixed, the control delay can be adjusted by software to adjust the entire monitor. The specific time of sensitivity, which not only improves the adjustment efficiency but also reduces the adjustment difficulty. For example, if the sensitivity of the sensor itself is 20ms, the main program and the interrupt service should take 40ms twice, but the calculation amount of the program itself is not large, so the operation time in the normal state should be much less than 1ms, if you want to set When the monitor's sensitivity is 230ms, the delay is set to 190ms, and the error is within 1ms. In this embodiment, the sensitivity of the monitor is controlled between 230ms and 340ms, and the delay time is calculated from 190ms to 300ms according to the sensitivity calculation formula of the monitor.

Claims

Claim

A vehicle overturning safety monitoring method, the method comprising the steps of:

(1) Pressure monitoring of all wheels of the vehicle;

(2) Collecting the real-time pressure value uploaded by the wheel;

(3) Adding the real-time pressure data obtained from all the wheels to determine whether the added data is greater than the set safety critical point. If it is greater than the safety critical point, the vehicle is in a safe state; if it is less than or equal to the safety threshold At the point, the vehicle is in a dangerous state; wherein the safety critical point is a fixed value corresponding to the vehicle of different models, and the range is smaller than the total of all the wheels to the ground when the vehicle is at a constant speed of 100 km/h at a constant speed of 100 km/h. The pressure is the minimum total pressure of the vehicle on the ground during normal driving, and greater than the sum of all wheel pressures measured by the pressure sensor on the vehicle when the vehicle is lifted off the ground by a crane or the like, that is, when the vehicle is stationary. The total pressure of the wheel;

(5) If the result of the judgment is that the vehicle is in a dangerous state, the real-time pressure value uploaded by the wheel is collected again at intervals, and the real-time pressure value and safety criticality uploaded by the wheel are again used by the comparison judgment method described in step (3). The point is judged and compared again in the same judgment cycle to determine whether the vehicle is in a safe state; the process of collecting data for comparison after a period of time is performed at least twice in the same judgment cycle, and if the judgment result is that the vehicle is in a safe state, then Triggering the safety device on the vehicle, restarting a new round of judgment cycle; if the last judgment result is that the vehicle is in a dangerous state, a pulse signal is sent to the safety device of the vehicle to trigger the safety device.

2. A vehicle overturning safety monitoring method, the method comprising the following steps -

(1) Pressure monitoring of all wheels of the vehicle;

(2) Collecting the real-time pressure value uploaded by the wheel;

(3) Adding the real-time pressure data obtained from the wheel on one side of the vehicle to determine whether the added data is greater than half of the set safety critical point. Claim

a. If it is still greater than half of the safety critical point, the vehicle is in a safe state, b. if less than or equal to half of the safety critical point, the vehicle is in a dangerous state; wherein the safety critical point is set according to different models of the vehicle The fixed value, the range is smaller than the total pressure of all the wheels on the ground when the vehicle is at a constant speed of 100 km/h at a constant speed of 100 km/h, that is, the minimum total pressure of the vehicle to the ground during normal driving, and greater than the vehicle at rest. When the crane is lifted off the ground by a machine such as a crane, the sum of all the wheel pressures measured by the pressure sensor on the vehicle is the total pressure of all the wheels when the vehicle is stationary.

(5) If the result of the judgment is that the vehicle is in a dangerous state, the real-time pressure value uploaded by the wheel is collected again at intervals, and the real-time pressure value and safety critical value uploaded by the wheel are again used by the comparison judgment method described in step (3). Half of the point is judged and compared again in the same judgment cycle to determine whether the vehicle is in a safe state; the process of collecting data for comparison for a period of time is performed at least twice in the same judgment cycle, and if the judgment result is that the vehicle is in a safe state, Then, the safety device on the vehicle is not triggered, and a new round of judgment cycle is restarted; if the last judgment result is that the vehicle is in a dangerous state, a pulse signal is sent to the safety device of the vehicle to trigger the safety device.

The vehicle overturning safety monitoring method according to claim 1 or 2, wherein the interval time is between 190ms and 300ms.

The vehicle overturning safety monitoring method according to claim 1 or 2, wherein in step (1), pressure monitoring of the wheel is performed by using a pressure sensor disposed at all wheel support portions of the vehicle, wherein all of the pressure sensors are respectively Connected to the A/D input of the pressure monitor, the output of the pressure monitor is connected to the base of the triode via a resistor, and the tertiary tube The emitter of the claim is connected to the trigger point of the safety device, and the collector of the triode is connected to the power supply via a voltage stabilizing circuit.

The vehicle overturning safety monitoring method according to claim 3, wherein the safety device of the vehicle is an airbag.