GB 12676-2014 PDF EnglishUS$305.00 · In stock · Download in 9 seconds
GB 12676-2014: Road vehicle -- Braking systems -- Structure, performance and test methods Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 12676: Historical versions
Similar standardsGB 12676-2014: Road vehicle -- Braking systems -- Structure, performance and test methods---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB12676-2014NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040.40 T 24 GB/T 12676-2014 Replacing GB/T 12676-1999 Technical Requirements and Testing Methods for Commercial Vehicle and Trailer Braking Systems Issued on. OCTOBER 10, 2014 Implemented on. JULY 01, 2015 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of PRC; Standardization Administration of PRC. Table of ContentsForeword... 4 1 Scope... 9 2 Normative References... 9 3 Terms and Definitions... 10 4 Specifications... 16 5 Tests and Performance Requirements... 43 6 Approval of Vehicle Type and Extension of Approval... 61 7 Conformity of production (COP)... 63 Annex A (Normative) Procedure for Monitoring the State of Battery Charge... 64 Annex B (Normative) Method of measuring the response time on vehicles equipped with compressed-air braking systems... 65 Annex C (Normative) Provisions relating to energy sources and energy storage devices (energy accumulators)... 71 Annex D (Normative) Provisions relating to specific conditions for spring braking systems... 79 Annex E (Normative) Distribution of braking among the axles of vehicles and requirements for compatibility between towing vehicles and trailers... 82 Annex F (Normative) Test procedure to assess the functional compatibility of vehicles equipped with electric control lines... 96 Annex G (Normative) Inertia dynamometer test method for brake linings... 103 Annex H (Normative) Special requirements to be applied to the safety aspects of complex electronic vehicle control systems... 107 Annex I (Normative) Test conditions for trailers with electrical braking systems... 112 Annex J (Normative) Cases in which Type- I and/or Type-II (or Type-IIA) or Type-III tests do not have to be carried out... 115 Annex K (Normative) Alternative procedures for Type-I and Type-III tests for trailer brakes... 117 Annex L (Normative) Conditions governing the testing of vehicles equipped with inertia (overrun) braking systems... 1241 ScopeThis Standard specifies the technical requirements and testing methods for commercial vehicle and trailer braking systems. This Standard applies to power-driven vehicles of categories M2, M3 and N AND trailers of category O, as specified in GB/T 15089. This Standard does not cover.2 Normative ReferencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3730.1 Motor vehicles and trailers-Types-Terms and definitions GB/T 3730.2 Road vehicle-Masses-Vocabulary and codes GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers - Vocabulary GB/T 5922 Motor vehicles and towed vehicles - Pressure test connection for compressed-air pneumatic braking equipment GB/T 13594-2003 Antilock braking performance and test procedure for motor vehicles and their trailers GB/T 15089 Classification of power-driven vehicles and trailers GB/T 20716.1 Road vehicles - Connectors for the electrical connection of towing and towed vehicles - Part 1.Connectors for braking systems and running gears of vehicles with 24V nominal supply voltage GB/T 20716.2 Road vehicles - Connectors for the electrical connection of towing and towed vehicles - Part 2.Connectors for braking systems and running gears of vehicles with 12V nominal supply voltage3 Terms and DefinitionsFor the purpose of this document, the following terms and definitions and those given in GB/T 3730.1, GB/T 3730.2, GB/T 5620 and GB/T 15089 apply. 3.1 Basic terms and definitions 3.1.1 Vehicle type 3.1.1.1 Motor vehicle With regard to braking system, the vehicles which do not differ in such essential respects as. 3.1.1.2 Trailer With regard to braking system, the vehicles which do not differ in such essential respects as. 3.1.2 "Braking system" means the combination of parts whose function is progressively to reduce the speed of a moving vehicle or bring it to a halt, or to keep it stationary if it is already halted. The system consists of the control, the transmission, and the brake proper; 3.1.3 "Actuation" means both application and release of the control. 3.1.4 "Transmission device" means the combination of components comprised between the control and the brake and linking them functionally. The transmission may be mechanical, hydraulic, pneumatic, electric or mixed. Where the braking power is derived from or assisted by a source of energy independent of the driver, the reserve of energy in the system is likewise part of the transmission. 3.1.5 "Brake" means the part in which the forces opposing the movement of the vehicle develop. It may be a friction brake (when the forces are generated by friction between two parts of the vehicle moving relatively to one another); an electrical brake (when the forces are generated by electro-magnetic action between two parts of the vehicle moving relatively to but not in contact with one another); 3.1.6 "Different types of braking systems" means systems which differ in such essential respects as. 3.1.7 "Component of a braking system" means one of the individual parts which, when assembled, constitutes the braking system;4 Specifications4.1 General 4.1.1 Braking system 4.1.1.1 The braking system shall be so designed, constructed and fitted as to enable the vehicle in normal use, despite the vibration to which it may be subjected, to comply with the provisions of this Standard. The braking response time on vehicles equipped with compressed-air braking systems shall comply with the specifications in Annex B. The energy sources and energy storage devices of braking system shall comply with the specifications in Annex C. The spring braking system shall comply with the specifications in Annex D. 4.1.2 Functions of the braking system 4.1.2.1 Service braking system The service braking system shall make it possible to control the movement of the vehicle and to halt it safely, speedily and effectively, whatever its speed and load, on any up or down gradient. It shall be possible to graduate this braking action. The driver shall be able to achieve this braking action from his driving seat without removing his hands from the steering control. 4.1.2.2 Secondary braking system The secondary braking system shall make it possible to halt the vehicle within a reasonable distance in the event of failure of the service braking system. It shall be possible to graduate this braking action. The driver shall be able to obtain this braking action from his driving seat while keeping at least one hand on the steering control. For the purposes of these provisions it is assumed that not more than one failure of the service braking system can occur at one time. 4.1.3 Connections, for compressed-air braking systems, between power-driven vehicles and trailers 4.1.4 Provisions for the periodic technical inspection of braking systems 4.1.4.1 It shall be possible to assess the wear condition of the components of the service brake that are subject to wear e.g. friction linings and drums/discs (in the case of drums or discs, wear assessment may not necessarily be carried out at the time of periodic technical inspection). The method by which this may be realized is defined in paragraphs 4.2.1.11b) and 4.2.2.8b) of this Standard. Other friction linings meeting the requirements of Annex G may be optional. 4.1.5 Complex electronic control system The requirements of Annex H shall be applied to the safety aspects of all complex electronic vehicle control systems which provide or form part of the control transmission of the braking function included those which utilize the braking system(s) for automatically commanded braking or selective braking. However, systems or functions, which use the braking system as the means of achieving a higher level objective, are subject to Annex H only as far as they have a direct effect on the braking system. If such systems are provided, they shall not be deactivated during testing of the braking system. 4.2 Characteristics of braking systems 4.2.1 Vehicles of categories M and N 4.2.1.1 The set of braking systems with which a vehicle is equipped shall satisfy the requirements laid down for service, secondary and parking braking systems. 4.2.2 Vehicles of category O 4.2.2.1 Trailers of category O1 need not be equipped with a service braking system; however, if a trailer of this category is equipped with a service braking system, it shall satisfy the same requirements as a trailer of category O2.5 Tests and Performance Requirements5.1 Test Requirements 5.1.1 General Requirements 5.1.1.1 The performance prescribed for braking systems is based on the stopping distance and/or the mean fully developed deceleration. The performance of a braking system shall be determined by measuring the stopping distance in relation to the initial speed of the vehicle and/or by measuring the mean fully developed deceleration during the test. 5.1.1.2 The brake shall be subjected to run-in in compliance with the running-in procedures stipulated by the manufacturer or the following requirements. 5.1.1.3 The stopping distance shall be the distance covered by the vehicle from the moment when the driver begins to actuate the control of the braking system until the moment when the vehicle stops; the initial speed shall be the speed at the moment when the driver begins to actuate the control of the braking system; the initial speed shall not be less than 98 percent of the prescribed speed for the test in question. 5.1.2 Road test conditions for vehicle braking performance 5.1.2.1 The vehicle's condition as regards mass shall be as prescribed for each type of test and be specified in the test report 5.1.2.2 The test shall be carried out at the speeds prescribed for each type of test; if the maximum design speed of a vehicle is lower than the speed prescribed for a test, the test shall be performed at the vehicle's maximum speed; 5.1.2.3 During the tests, the force applied to the control of the braking system in order to obtain the prescribed performance shall not exceed the maximum force laid down for the test vehicle's category; 5.1.2.4 The road shall have a surface affording good adhesion, unless specified otherwise; 5.1.2.5 The gradient on any 50 meters of longitudinal surface on the test road shall be less than 1 percent. The parking test gradient shall follow the relevant provisions. The gradient of road crown shall be less than 2 percent. 5.1.4 Type-O test (ordinary performance test with brakes cold) 5.1.4.1 General 5.1.5 Type-I test (fade test) 5.1.5.1 Repeated braking test 5.1.5.1.1 The service braking systems of all power-driven vehicles shall be tested by successively applying and releasing the brakes a number of times, the vehicle being laden, in the conditions shown in the Table 3. 5.2.3 Parking braking system 5.2.3.1 The parking braking system shall, even if it is combined with one of the other braking systems, be capable of holding the laden vehicle stationary on an 18 percent up or down-gradient.6 Approval of Vehicle Type and Extension of Approval6.1 Approval of Vehicle Type As for a group of vehicle types applied for approval, one or more vehicles having the following characteristics shall be taken as representative (s), which shall undergo all tests specified in this Standard. 6.2 Extension of Approved vehicle types 6.2.1 In the case of any modification to the braking system of the approved vehicle types, it shall be necessary to apply for extension. 6.22 In case the extension of approved vehicle types complies with the principles in paragraph 6.1, the extension shall be granted. 6.23 In case the extension of approved vehicle types exceeds the range specified in paragraph 6.1, retest shall be performed.7 Conformity of production (COP)A vehicle approved to this Standard shall be so manufactured as to conform to the type approved by meeting the requirements set forth in Section 4. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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