如何檢測汽車的制動性能？—How to test the braking performance of a car？

 如何檢測汽車的制動性能？

How to test the braking performance of a car？

英文版本滑到最後

English read slide to the end

制動性能檢測一般可分為道路檢測與制動試驗台檢測兩種

（1）道路檢測

①制動時間、制動距離，緊急制動跑偏量檢測在坡度不大於1%，平坦、乾燥、清潔的硬質路面上，以20 km /h車速緊急制動，直至車輛停止，測出車輛的制動時間、制動距離，緊急制動跑偏量。

 ②點制動檢測:以40 km /h 車速點制動時，汽車應不跑偏

③駐車制動力檢測:起動發動機，拉緊手制動，踩下離合器踏板，變速器掛進二檔(小車一檔)，放鬆離合器踏板，發動機應熄火

(2) 試驗台檢測:

車輛在試驗臺上按國家試驗規範進行測試，可測出車輛的前輪、後輪制動力，駐車制動力。汽車的制動性主要由三個方面來評定:

1、制動效能:指汽車迅速降低行駛速度直至停車的能力，是制動性能最基本的評價指標，它是由一定初速度下的制動距離，制動減速度和制動時間來評定。

2、汽車的抗熱衰退性:指汽車高速制動，短時間多次重複制動或上下坡連續制動時制動效能的熱穩定性。

3、制動時汽車的方向穩定性:指汽車在制動時按指定軌跡行駛的能力，即不發生跑偏，側滑或失去轉向的能力。

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Braking performance testing can generally be divided into two types: road testing and braking test bench testing

(1) Road testing

①Braking time, braking distance and emergency braking runout inspection，On a flat, dry and clean hard surface with a gradient of less than 1%, emergency braking at a speed of 20 km/h until the vehicle stops, the braking time, braking distance and emergency braking runout of the vehicle are measured.

 ② Point braking test: with 40 km / h speed point braking, the car should not run off the road

③Parking brake power test: start the engine, pull the hand brake, depress the clutch pedal, shift into second gear (first gear of the car), release the clutch pedal, the engine should be turned off

(2) Test bench inspection.

The vehicle is tested on a test bench in accordance with national test regulations, and the braking power of the front and rear wheels and the braking power of the vehicle in park can be measured. The braking performance of a vehicle is assessed in three main ways.

It is the most basic evaluation index of braking performance, which is assessed by the braking distance, braking deceleration and braking time under a certain initial speed.

2, the car's resistance to heat recession: refers to the car's high-speed braking, short time repeated braking or continuous braking up and down the slope braking performance of thermal stability.

3、The directional stability of the vehicle during braking: it refers to the ability of the vehicle to travel according to the specified trajectory during braking, i.e. not to run off, skid or lose the ability to steer.