1、日本汽车标准_JASO C402-1999 英文版 乘用车行车制动器道路试验规程_JAPANESE AUTOMOBILE STANDARD JASO C402: 1999 Passenger cars - Service brake road test procedures 1. Scope This Standard specifies road test procedures for service brakes for passenger cars operated under normal conditions. This Standard does not apply to two-
2、wheeled vehicles. 2. Applicable Publications The following publications form a part of this Standard to the extent specified herein. The latest issue of all publications shall apply. JIS DO210 JASO C428 General Rules of Brake Test Method of Automobiles and Motorcycles Parking Brake Test Procedure 3.
3、 Definitions The definitions of main terms used in this Standard conform to 2 (Definition of Terms) of JIS DO210 and the following. a)lnitial Brake Temperature The value read within 15 seconds before the start of brake application. Where specified, the initial brake temperature shall be the highest
4、of the mean values for each wheel measured per axle. 4. Test Conditions 4. I Vehicle CI ass if i cat i on Test vehicles are classified by nominal maximum speed and conform to the provisions of JIS DO210 Category PI Over 140km/h Category P2 Category P3 9lkmlh to IlOkm/h Category P4 90kmlh and under 1
5、11 km/h to 140kmlh 4.2 Vehicle Condition Test vehicles shall conform to 4.1 (Condition of Vehicles) of JIS DO210 4.3 Condition of Brake Parts Each part of the braking device shall conform to 4.3 (Condition of Brake) of JIS D0210. 4.4 Conform to 4.2 (Road Surface and Weather Conditions) of JIS D0210.
6、 4.5 Temperature Measurement Brake temperature shall be measured as specified in 6 (Temperature Measurement) of JIS D0210. Road Surface and Weather Conditions 5. Test Procedures 5.1 Braking Operation a) Braking operation shall be performed with a continuous pedal force not exceeding 500N until the v
7、ehicle comes to a complete stop. b) In braking operations with constant braking deceleration, when the designated deceleration cannot be attained after pedal force reaches 500N, braking operation shall be performed with pedal force of 500N. c) Braking shall be initiated when the vehicle is at the ce
8、nter of a 3.5m wide lane, and the posture of the 5.2 Test Items and Sequence a) Preburnish check test vehicle shall be controlled so that no part of the vehicle leaves the lane. Initial braking speed Initial brake temperature Braking operation 50km/h or less 80C or less Braking deceleration of 3.0m/
9、s2 or less 1 JAS0 C402: 1999 Repetitions 10 or less Record Pedal force or line pressure, braking deceleration, and initial brake temperature Remarks: Proceed to the next test item only after this test is completed with test equipment, brakes and vehicle functioning normally throughout the test. b) F
10、irst effectiveness test Initial braking speeds 5Okm/h, 100km/h for PI and P2 vehicles 50km/h, 80kmlh for P3 vehicles 50km/h, 65km/h for P4 vehicles Transmission control position Neutral Initial brake temperature 80C Braking operation Repetitions Constant braking deceleration or constant pedal force
11、(line pressure) Braking applications shall start with the lowest braking deceleration or pedal force for each initial braking speed, and shall be repeated with increasing degrees until wheel lock occurs, the vehicle exceeds the lane boundaries or pedal force reaches 500N. Brake applications should b
12、e repeated at least 6 times at appropriate intervals. Record Pedal force or line pressure, braking deceleration, wheel lock condition, and deviation of vehicle from lane boundaries. Remarks: c) Burnish Initial braking speed should be applied sequentially from the lowest specified condition. Initial
13、braking speed 65km/h Transmission control position Braking operation Cooling speed 65kmlh Braking interval Normal driving position Braking deceleration of 3.5m/s2 1,500m or 120C of the initial brake temperature, whichever is attained earlier. reaches 120C even if the braking interval does not reach
14、1,500m. Pedal force or line pressure, and initial brake temperature (every first and 20th repetitions) Braking shall commence when the temperature Repetitions 200 Record d) Second effectiveness test 1) Low temperature effectiveness test Initial braking speed 50km/h Transmission con t ro I pos t ion
15、Neutra I Initial brake temperature 50C or less Braking operation Constant braking deceleration or constant pedal force (line pressure) Repetitions Braking shall start with the lowest braking deceleration or pedal force for each initial braking speed, and shall be repeated with increasing degrees unt
16、il wheel lock occurs, the vehicle exceeds the boundaries, or pedal force reaches 500N. Brake applications shall be repeated at least 3 times at appropriate intervals. Pedal force or line pressure, braking deceleration, and initial brake temperature Record Remarks: When the initial brake temperature
17、does not reach 50C, braking operation may be performed successively. 2) Normal temperature effectiveness test 50, 100, and 130km/h for PI vehicles 50, 80, and 100km/h for P2 vehicles Repetition of the first effectiveness test specified in b). The initial braking speeds, however, shall be as follows.
18、 2 JAS0 C402: 1999 50 and 80km/h for P3 vehicles 50 and 65km/h for P4 vehicles e) First reburnish Repetition of the burnish specified in c) Burnish, except that the number of brake applications shall be reduced to 35 and data shall be recorded for the first, loth, 25th and 35th repetitions. f) Light
19、 load effectiveness test Repetition of the first effectiveness test specified in b) First effectiveness test. (Not required for vehicles with a capacity of 2 persons or less.) 1) Base line check g) First fade and recovery test Initial braking speed Vmax O/-20 km/h Upper limit 100kmh Transmission con
20、trol position Neutral Initial brake temperature 80C Braking operation Record 2) Fade test Where, Vmax: the nominal maximum speed (km/h) Constant braking deceleration of 5.0m/s2 Pedal force or line pressure Repetitions 3 Initial brakina sDeed i/ (80% V,)* - (40% V,)2 Upper limit 100kmlh Where, 80%Vma
21、x: value (km/h) equal to nominal max. speed multiplied by 0.8 40%Vmax: value (kmlh) equal to nominal max. speed multiplied by 0.4 Normal driving gear 60C for initial application only Constant braking deceleration of 3.0m/s2 constant (See g of 6.1 .) Equal to initial braking speed Maximum level immed
22、iately following completion of braking Transmission control position Initial brake temperature Braking operation Cooling speed Accelerating condition Braking interval 640m Record Pedal force or line pressure, initial brake temperature, time required for fade test, and atmospheric temperature and win
23、d velocity at the beginning of fade test Repetitions 10 Remarks: The test shall continue uninterrupted from the initial to the final braking of the fade test. 3) High temperature effectiveness test Interval from preceding test Immediately after the fade test perform maximum acceleration test. Start
24、braking operation when the specified initial braking speed is attained. Same as in 1) Base line check Constant braking deceleration of 5.0m/s2 constant Pedal force or line pressure and initial brake temperature Initial braking speed Transmission control position Neutral Braking operation Record Inte
25、rval from preceding test 1,500m immediately after completion of high temperature effectiveness test, run vehicle at 50km/h and, upon attaining specified braking interval, start braking operation. Repetitions 1 4) Cooling effectiveness test Initial braking speed 5Okm/h 3 JAS0 C402: 1999 Transmission
26、control position Braking operation Cooling speed 50km/h Braking interval 1,500m Record Recovery test Interval from preceding test Normal driving gear Constant braking deceleration of 3.0mls constant (See g) of 6.1 .) Repetitions 4 Pedal force or line pressure and initial brake temperature 1,500m imm
27、ediately following cooling effectiveness test, run vehicle at initial braking speed and, upon attaining specified braking interval, start braking operation. Same as in 1) Base line check Constant braking deceleration of 5.0mls2 constant (See g) of 6.1 .) Equal to initial braking speed Pedal force or
28、 line pressure and initial brake temperature Same as in 2) Fade test Initial braking speed Transmission control position Neutral Braking operation Cooling speed Record Effectiveness spot check (Optional) Initial braking speed Transmission control position Neutral Initial brake temperature 80C Brakin
29、g operation Repetitions 1 Constant braking deceleration of 3.0mls constant (See g) of 6.1 .) Pedal force or line pressure Repetitions 2 Record h) Second reburnish i) Second fade recovery test Repetition of e) First reburnish. 1) Base line check be 5Okmlh. 2) Fade test 3) High temperature effectivene
30、ss test (Optional) 4) Recovery test 5) Effectiveness spot check (Optional) Repetition of g), 2) Base line check. The initial braking speed, however, shall Repetition of g), 2) Fade test. The braking deceleration, however, shall be 5.0m/s2 constant and the number of repetitions shall be 15. effective
31、ness test. Repetition of g), 3) High temperature Repetition of g), 5) Recovery test. The initial braking speed and cooling speed, however, shall be 50km/h and the number of repetitions shall be 12 or more. The initial braking speed, however, shall be 5.0m/s2 constant. Repetition of g), 6) Effectiven
32、ess spot check. j) Third reburnish k) Final effectiveness test Repetition of First reburnish of e) Repetition of d), 2) Normal temperature effectiveness test. shall be optionally changeable to the following values: The initial braking speed, however, 15Okmlh for vehicles with nominal maximum speeds
33、above 160kmlh but less than 170kmlh. 160kmlh for vehicles with nominal maximum speeds exceeding 170kmlh. i) Fourth reburnish m) Water recovery test 1) Base line check Repetition of e) First reburnish. This item may be omitted when not essential. Initial braking speed 5Okm/h 4 JAS0 C402: 1999 Transmi
34、ssion control position Initial brake temperature 80C Braking operation Normal driving gear Constant braking deceleration of 3.0m/s2 constant (See g) of 6.1 .) Pedal force or line pressure Repetitions 3 Record 2) Water immersion The test vehicle shall travel or shuttle back and forth in a trough cont
35、aining 15cm of water for 2 minutes at an approximately 10kmlh with the brake fully released. Interval from the preceding test Initial braking shall be applied within 1 minute from Initial braking speed 50km/h Transmission control position Braking operation Cooling speed 50km/h Braking interval 800m
36、or less Repetitions 15 Record Remarks: Travelling speed shall not exceed 50km/h for the period between completion of water immersion 2) Recovery test completion of water immersion. Normal driving gear Constant braking deceleration of 3.0m/s2 (See g) of 6.1.) Pedal force or line pressure and the star
37、t of initial braking. During this period, no braking operation should be performed. n) Final inspection 5.3 Allowable Modifications of Test Conditions a) Test braking for the following items shall start when the reading of the calibrated measuring instrument Every brake shall be disassembled and ins
38、pected, and the results recorded. stays within the following range under the specified conditions. 1) Initial braking speed shall be within -t3km/h of that specified. Record the value targeted within this range. Initial braking speed shall not exceed 80% of the vehicles nominal maximum speed and the
39、refore shall be reduced by increments of 5kmlh when required P4 vehicles with low nominal maximum speeds. For P3 and P4 and special built vehicles, initial brake temperatures 80C and 120C shall be modifiable to 60C and 80C respect i vel y. 2) Initial brake temperature shall be held within k1OC of th
40、at specified. b) Readings of the calibrated measuring instruments shall be kept within the ranges specified below. 1) Braking deceleration shall be held within +0.5/0 m/s2 of that specified. 2) Cooling speed shall be within -t3km/h of that specified. Record the value targeted within this range. Reco
41、rd the value targeted within this range. Initial braking speed shall not exceed 80% of the vehicles nominal maximum speed and therefore shall be reduced by increments of 5km/h when required P4 vehicles with low nominal maximum speeds. c) The braking interval shall be set to a value as close as possi
42、ble to the specified distance. The braking interval, however, shall be modifiable within the range specified in Table 1 when modification is required. When a particular distance within this range is set as the braking interval, or when the distance involves periodic change, record the value. 5 JASO
43、C402:1999 Table 1 Allowable Range for Braking Interval Unit: m Test Item Braking Interval Distance Cooling Effectiveness Test Recovery Test (Fade Recovery Cooling When P4 vehicles are tested at cooling and initial braking speeds lower than the specified values, the braking interval shall conform to
44、the specified distance interval. 5.4 Unspecified Braking Operations Any braking operation not specified for the tests shall be avoided. When the brake needs to be heated to the specified temperature, however, the initial braking speed and braking deceleration shall conform to the burn ish conditions
45、. 5.5 Modification of Vehicle Classification Vehicle classification may be modified for vehicles not specified in the vehicle categories. 5.6 Additional Test Items When the parking brake test (optional) is necessary, a part or all of the test items specified in JASO C428 may be performed. The test s
46、equence is not specified. 6. Records 6.1 Recording Procedures The following items shall be monitored, measured and recorded. a) Any phenomenon indicating abnormal brake performance; noise, vibration, etc. taking place during the b) Occurrence of any wheel lock during the test including the position
47、of the wheel involved, the c) Failure of the test vehicle to be kept within the test lane boundaries. d) Advance measurement of the correlation between line pressure and pedal force when the line pressure is adopted e) For tests with constant braking deceleration; Initial, intermediate (continuous),
48、 and final values of pedal force or line pressure and the time they approach the maximum value. Values shall be measured before vehicle speed drops below 10km/h to avoid build up influence on the reading incidental to the period immediately before the stopping moment. f) For tests with constant brak
49、ing pedal force; Initial, intermediate (continuous), and final values of the braking deceleration and the time they approach the maximum value. Values shall be measured before the vehicle speed drops below 1 Okm/h to avoid build up influence on the reading incidental to the period immediately before the stopping moment. g) When the average value of braking deceleration does not stay within +15% that specified where constant application is required the deviated values and the respective values of pedal force or line pressure shall be recorded. test. conditions in which wheel lock occur
