标准编号:	GB/T 12536-1990
中文名称:	汽车滑行试验方法
英文名称:	Motor vehicles－Coastdown－Test method
中标分类:	T04    基础标准与通用方法
行业分类:	GB    国家标准
ICS分类:	43.020 43.020    道路车辆综合 43.020
发布机构:	中华人民共和国国家质量监督检验检疫总局
发布日期:	1990-1-2
实施日期:	1991-9-1
标准状态:	superseded
被新标准替代:	GB/T 12536-2017 汽车滑行试验方法
被替代日期:	2018-5-1
替代旧标准:	GB 1334-1977
翻译语言:	英文
文件格式:	PDF

1 Subject Content and Application Scope This standard specifies the test method of motor vehicles' coastdown. This standard is applicable to all kinds of motor vehicles. 2 Normative References GB/T 12534 Motor Vehicles-General Rules of Road Test Method 3 Testing Conditions 3.1 Measuring apparatus The fifth wheel gauge or the corresponding recording device of speed and travel distance, with an accuracy of not less than 0.5%. 3.2 The door and window of the motor vehicle shall keep closing. 3.3 Other test conditions and test vehicles are prepared according to the requirements of GB/T 12534. 4 Test Methods 4.1 The surveyor's poles shall be erected at both ends of the test road section about 1 000 m long, acting as the coastdown section. The motor vehicle shall keep a speed slightly exceeding 50 km /h before it enters into the coastdown section. 4.2 Before the motor vehicle enters into the coastdown section, the driver shall change the gearshift into free position (disconnecting the clutch pedal), and then start the coastdown. As the speed reaches 50 km /h (the motor vehicle shall enter into the coastdown section), the record shall be kept on with the help of the fifth wheel gauge until the motor vehicle stops completely. The driver shall not rotate the steering wheel in the process of coastdown. 4.3 The initial speed (shall be 50±0.3 km /h) and the coastdown distance shall be recorded. 4.4 The coastdown testing shall be carried out at least once both fro. And to; and the section of both direction shall be superposed as much as possible .The result shall be recorded in Table 1.