Cause of the motor vehicle driving safety analysis

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Cause of the motor vehicle driving safety analysis

(7) ... a 1-type (7) and (4) represents the average of 0 is very similar to the wording,[link widoczny dla zalogowanych], but more square, so the mean square value of o2 is defined as one to three o {· ( Cool

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can have a 1 acre port; (9) (9) is the significance of changes in the case of wheel load, the mean square value equal to the spreading rate. Taking into account the safety of car driving,[link widoczny dla zalogowanych], and road forces on the wheels,[link widoczny dla zalogowanych], wheel load change should be as small as possible, that = should be very small, the absolute value of their static load P due to the different wheels and a big difference. For example, a standard deviation of 100kg, to Ps = 2oOOkg Truck, nearly does not affect their driving safety, while a wheel load of small passenger cars only 3OOkg terms,[link widoczny dla zalogowanych], there is very considerable. Taking into account this effect. Automobile driving safety based on the evaluation measure, / P /, as the tire dynamic load and static load set ==- establish contact, according to a statistical significance of P √ PD and (9), there =. Wheel of the car with its load of static load is changed,[link widoczny dla zalogowanych], so, in order to achieve about the same driving safety must require port == _P:. :. The meaning is empty of wheel load changes must be less than the full load when the wheels of change. Speed and safety of vehicle driving safety for the evaluation of measurement P / as: P. ~ / LRa, Ps = Rg (10) where \P ≥ P or Pm / P ≥ l. To ensure the safety of car driving all of p, must satisfy <l. by the type (1O) can get over 7 ') a 4-l997 No. 6 (Total No. 141 ) conditions can be expressed as such <1. We know that only when the role of the level of the wheel rolling resistance P, is not greater than the vertical load P and the friction coefficient, \. The vehicle vibration Negative elbow dynamic load attached to the quality of the car will decrease. that P-P-P (11) by (11) and P, ≤ up too: P, ≤ \≤ shelf First) (12) where. P, / P for the rolling resistance coefficient and the P / P-d / g, then (12) can be rewritten as:, ≤ 1 n is a driving safety conditions can be written as: ≤ l a g \When driving, if the rolling resistance coefficient known ground, and the value of adhesion coefficient, and the car was built by the relationship between V curve (see Figure 3), can predict driving safety car will lose speed limit. If off-road tires average values in the wet: a 0.150; \6. From O6O +4 O2 Figure 3n / g and the relationship between speed can be seen in Figure 3, corresponding to d / g = 0.6 the speed of 4.5m / s. Under these conditions that the speed can not exceed 4.5m / s, otherwise the traffic safety will not be guaranteed. It should be noted is that for different road conditions d / g and the curve is different. 6 Conclusion practicing above, the vehicle driving safety involves not only changes the wheel vertical load and its amplitude and frequency, but also, and the car speed, road status. The present study also limited to the experimental data, empirical formula, and there are many problems to be us to further study. Soul issued on the date; 19g Bu Bu D BMw D2 launched a series BMW North America head protection head protection system introduced in the automotive side impact Cong, the system can protect the driver and passengers in the head and neck. According to BMW statistics, j0 who suffer from side impact injury accidents, of which 1 / 3 of head injuries. BMW spokesman said the head protection system can reduce the 80 head injuries. The Department of exemption for the inflatable tube structure. BMW does not call for the air bag is there are several reasons; collision, it hold air, at least not immediately deflated; it started right speed, do not exhaust, therefore, will not burn. The system can maintain the tube inflated for 6 seconds. When deflated, the tube length 914mm, diameter 38ram. It chest shield roof above the front door in the village, fixed cover in launching A recent column in the tarsal and roof of the B pillar behind. An uncle and I face a collision, inflatable device by the electronic start, to the sealed silicone tube inflatable. Braided nylon outer tube helps keep the shape of the tube, the diameter of the tube within the expansion in the 25ms to 130mm. Head protection system was first installed in 98 car-type 7401,740 ii and 750iL. Zhang Ling pick select from the \