CN203957904U - A kind of medium bus turning speed control setup - Google Patents

Abstract

The utility model discloses a kind of medium bus turning speed control setup, comprise wheel speed sensor, obliquity sensor, control unit, actuating unit, wherein, wheel speed sensors and obliquity sensor be connection control unit respectively, and another mouth of control unit connects actuating unit motor.This device can real-time monitor car speed when medium bus is turned section, once hypervelocity is taken measures in time, auxiliary navigating mate regulation speed, guarantees the safety of driving a vehicle.This device can improve safety performance when turning.

Description

A kind of medium bus turning speed control setup

Technical field

The utility model belongs to the auxiliary driving of safety field, relates to a kind of control setup, is specifically related to a kind of medium bus turning speed control setup.

Technical background

In recent years, the demand sustainable growth of society to communications and transportation, but meanwhile, traffic safety problem also becomes increasingly conspicuous.Wherein, driving over the speed limit under hypervelocity, especially dangerous road conditions is the major reason that causes traffic accident.When automobile travels on bend, when turn radius is too little or vehicle speed is too fast, all can there is car body and break away or overturn.For guaranteeing traffic safety, during turning, need to control the speed of a motor vehicle.

Therefore, the utility model design is a kind of can be at turning section identification turn radius, and intelligent decision automotive safety situation initiatively takes the speed measure of control section of avoiding that the medium bus turning speed control setup of traffic accident occurs.Medium bus turning speed control setup of the present utility model utilizes wheel speed sensors and the obliquity sensor identification speed of a motor vehicle and turn radius, the safety case of judgement turning section vehicle operating, and the car speed of automatically taking measures to control under overspeed situation, automobile is initiatively averted danger, reduce burden and the misjudgment of chaufeur, the intellectuality of lifting vehicle speed is controlled, and guarantees turning section vehicle safe driving or reduces most possibly the extent of injury of accident.

Summary of the invention

The purpose of this utility model is to realize in medium bus turning section the monitoring speed of a motor vehicle in real time, once hypervelocity is taken measures in time, assists navigating mate regulation speed, guarantees the safety of driving.

The utility model chief component comprises wheel speed sensors, obliquity sensor, embedded control unit, actuating unit etc.;

Described control unit adopts treater STR712FR2;

Described wheel speed sensors adopts T05 (SF) wheel speed sensors;

Described obliquity sensor adopts 50721 model micro-electro-mechanical gyroscope sensors of Austrian SensorDynamics company;

Described motor adopts two-phase segmentation stepping motor;

Described wheel speed sensors and the mouth of obliquity sensor are all connected with the input end of described embedded control unit, and the mouth of described embedded control unit is connected with the input end of actuating unit.

The purpose of this utility model can realize by following measures:

The speed of a motor vehicle, turn radius that wheel speed sensors and obliquity sensor obtain automobile are installed on medium bus, signal parameter is passed to embedded control unit.First embedded control unit is processed speed signal, the medium bus that basis detects is again at the driving cycle in turning section, according to the automobile dynamic quality model turn inside diameter section speed limit that travels, carry out the judgement of vehicle driving safe condition, if discovery overspeed of vehicle, control unit is calculated the rotation number of turns of actuating motor, control in real time actuating unit, reduce brake activation valve aperture to reach the object of limited speed, once the speed of a motor vehicle lowers, embedded control unit just can stop controlling actuating unit.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

1-obliquity sensor, 2-wheel speed sensors, 3-embedded control unit, 4-actuating unit.

Fig. 2 is speed signal treatment circuit.

Fig. 3 is the basic structure of embedded control unit.

Stressed schematic diagram when Fig. 4 is automobile generation rollover.

The specific embodiment

By reference to the accompanying drawings, further the utility model is described.

With reference to Fig. 1, the utility model comprises obliquity sensor 1, wheel speed sensors 2, embedded control unit 3, actuating unit 4.

Obliquity sensor 1 is selected micro-electro-mechanical gyroscope, is installed on vehicle body, can directly obtain the turn radius of Vehicle Driving Cycle, and precision is high, and measurement range is wide.

Wheel speed sensors 2 is selected magnetoelectric tachometric transducer, is installed on wheel, gathers the velocity of rotation of wheel, for the running velocity of measuring vehicle.

Embedded control unit 3 is responsible for the processing of data and the control work of actr.As shown in Figure 3, select treater STR712FR1, on embedded OS μ C/OS-II basis, build.Mainly comprise microprocessor STR712FR2, power circuit, crystal oscillating circuit, reset circuit, jtag interface, memory module, serial interface module circuit.Reception, from the signal of obliquity sensor 1 and wheel speed sensors 2, is processed wheel speed sensors signal with reference to Fig. 2: first signal is amplified, then through bandpass filter, process filtering distortion and interfering signal.Finally by over-voltage comparator module, according to automobile dynamic quality model, judge whether be less than turning section safe speed, if be greater than safe speed, transmitted signal is controlled to 4 pairs of control mechanisms of actuating unit, with regulation speed if working as vehicle in front; If be less than safe speed, be output as zero.This treater has the feature of High Performance, low-power consumption.

Actuating unit 4 adopts two-phase segmentation stepping motor, and the control that stepping motor and chaufeur are implemented brake pedal is relation in parallel.The aperture of step motor control brake activation valve.By control wave number, carry out the angular displacement of control step motor, stepping motor turn an angle motionless after, can maintain certain brake-pressure, reduce brake activation valve aperture, realize restricted speed.

In implementation process, first mounted angle sensor 1, wheel speed sensors 2 and actuating unit 4.After system startup work, embedded control unit 3, by constantly receiving from the turn radius of the Vehicle Driving Cycle of obliquity sensor 1 with from the Vehicle Speed of speed sensor 2, is then carried out safe condition differentiation to descending section.Set up corresponding automobile dynamic quality model, draw the safety speed of current driving road conditions, just can realize the correct judgement to traffic safety.Concrete determination methods and the derivation of equation are referring to < < city motor bus active speed control system research > > (highway and automobile the 6th phase of November in 2009)

Assumed vehicle at the uniform velocity travels on bend, and speed is v, and automobile total mass is m, and automobile turning radius is r, and the friction coefficient between tire and ground is μ, and the grade angle of road are very little, can ignore, and the suffered force of inertia of automobile is

$G=\frac{{\mathrm{mv}}^2}{r}---\left(1\right)$

Because medium bus has started rollover when not yet breakking away, as long as avoid its rollover to be safety.When rollover occurs automobile, its force diagram as shown in Figure 4.

By D'Alembert's principle, obtained:

Σ M _a=0, $\mathrm{mg}\frac{b}{2}-\mathrm{Gh}=0---\left(2\right)$

$\frac{b}{2h}g=\frac{v^2}{r}---\left(3\right)$

When the speed of a motor vehicle, turn radius and body dimensions meet formula (3), the critical conditions of medium bus in rollover.H is automobile height of center of mass, and b is wheelspan.

When the speed of a motor vehicle is greater than safe speed, embedded control unit 3 is calculated the rotation number of turns of actuating motor, to carrying out stepping motor, give an order, thus motor traction braking pedal regulation speed.The angle of stepping motor is easily controlled, turn an angle motionless after, can maintain certain brake-pressure.Once the speed of a motor vehicle lowers, motor just can be cancelled rotation.

Claims (1)

1. a medium bus turning speed control setup, is characterized in that: comprise wheel speed sensors, obliquity sensor, embedded control unit and actuating unit;

Described control unit adopts treater STR712FR2;

Described wheel speed sensors adopts T05 (SF) wheel speed sensors;

Described obliquity sensor adopts 50721 model micro-electro-mechanical gyroscope sensors of Austrian SensorDynamics company;

Described motor adopts two-phase segmentation stepping motor;

Described wheel speed sensors and the mouth of obliquity sensor are all connected with the input end of described embedded control unit, and the mouth of described embedded control unit is connected with the input end of actuating unit.