1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14599 Horn Blowing Mechanism Durability, Steering Wheel Copyright 2012 General Motors Company All Rights Reserved March 2012 Originating Department: North American Engineering Standards Page 1 of 6 1 Scope Note: Nothing in this standard supercedes a
2、pplicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. To evaluate the durability of horn blowing mechanisms which are integral parts of steering wheel assemblies including horn pad(s), cap(s)
3、, or airbags, if applicable. 1.2 Foreword. This test is designed to demonstrate durability of the horn blowing mechanism under loading conditions corresponding to extreme usage. 1.3 Applicability. Passenger cars, Multipurpose Passenger Vehicles (MPV), and trucks. 2 References Note: Only the latest a
4、pproved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW14095 2.3 Additional References. None. 3 Resources 3.1 Facilities. 3.1.1 Stroking machine capable of exerting a force up to 130 N at a rate of 1200 cycles per
5、hour or less. 3.1.2 Fixture to hold steering wheel. The arm of the stroking machine in its travel must depress the horn mechanism in a direction perpendicular 20 degrees to its surface. 3.2 Equipment. 3.2.1 Load application device for stroking machine, metal hemispherical in design, 19 1 mm in diame
6、ter. 3.2.2 Electrical system as shown schematically in Appendix A, Figure A1 for steering wheel horn blowing mechanism: a Direct Current (DC) power supply capable of 14 V with ripple not to exceed 5%, and representative horn system components. 3.2.3 A counter (See Appendix A, Figure A1, Number 2) op
7、erated by horn system electrical output signal (not horn switch contacts). 3.2.4 A counter (See Appendix A, Figure A1, Number 1) operated by a micro-switch which is triggered by the reciprocating motion of the stroking machine ram. This counter is used as a means to compare the horn relay actuation
8、count to the ram actuation count in order to detect horn mechanism malfunction. 3.2.5 A DC current monitoring device which shuts down the system if the amperage gets above 150 mA or below 4 mA (not shown in Appendix A, Figure A1). 3.2.6 A 90 N scale. 3.2.7 Signal buzzer. Note: All instrumentation is
9、 to be calibrated as required; record instrumentation details and date of calibration on Data Sheet A1 (see Appendix A), unless the information is otherwise preserved in the testing laboratory records. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for
10、ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14599 Copyright 2012 General Motors Company All Rights Reserved March 2012 Page 2 of 6 3.2.8 Steering wheel(s) with horn blowing mechanism and airbag, if applicable. 3.3 Test Vehicle/Test
11、 Piece. Not applicable. 3.4 Test Time. Not applicable. Calendar time: days Test hours: hours Coordination hours: hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. 4.1.1 Record parts to be tested. 4.1.2 Mount the steering wheel on
12、the supporting fixture and align so that the load application device on the arm of the stroking machine will operate the horn mechanism at the location that will create the greatest mechanical stress. The responsible engineer shall denote this location. 4.1.3 Connect the DC electrical system to the
13、wheel horn blowing mechanism and set the voltage supply to a nominal 14.0 0.1 V DC (open circuit). 4.1.4 Depress the steering wheel horn blowing mechanism manually in several areas to check out the system and to verify that no dead spots exist. Record comments on Data Sheet A2 (see Appendix A). 4.2
14、Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Select test location(
15、s) per GMW14095. 4.3.2 Adjust the force of the stroking arm to the greater of the following load values. a. A value of 40 9 N. b. Two (2) times the measured maximum room temperature horn blowing load specified in GMW14095. 4.3.3 Set both counters to zero (see Appendix A, Figure A1). 4.3.4 Operate th
16、e system at a rate of 1200 cycles per hour maximum with an “on time” of 1 s per cycle. 4.3.5 Record the number of cycles shown on counter number two (2) at failure or to 50 000 cycles for all market regions except emerging market region where number of cycles is 250 000 cycles per each of two locati
17、ons. Depress the steering wheel horn blowing mechanism manually in several areas to again verify the absence of dead spots and record the results on Data Sheet A2 (see Appendix A). Inspect for structural integrity and record condition on Data Sheet A2 (see Appendix A). Record the effort required to
18、actuate the horn (this can be done by the use of a 90 N scale and a signal buzzer) on Data Sheet A2 (see Appendix A). 4.3.6 A failure is any electrical or physical condition which prevents the mechanism from operating its electrical load. Note: An ammeter may be added to the system to check the chan
19、ge in amperage versus time, (i.e., Amperage may be checked every 5000 cycles). 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentation. Record pertinent test results on the supplied data sheets. Copyright General Motors Company Provided by IHS u
20、nder license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14599 Copyright 2012 General Motors Company All Rights Reserved March 2012 Page 3 of 6 6 Safety This standard may involve hazardous materia
21、ls, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
22、 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. DC Direct Current MPV Multipurpose Passenger Vehicles SSTS Subsystem Technical Specification 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14599 9 Release a
23、nd Revisions This standard was originated in October 2005. It was first approved by the Steering Wheel Global Subsystem Leadership Team in March 2006. It was first published in March 2006. Issue Publication Date Description (Organization) 1 MAR 2006 Initial publication. 2 MAR 2012 5 year refresh, re
24、vise test cycles and test location. (Interiors) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14599 Copyright 2012 General Motors Compa
25、ny All Rights Reserved March 2012 Page 4 of 6 Appendix A Figure A1: Electrical Test System Design Operational Sequence: a. Timer in “ON” energizes air solenoid causing depression of horn blowing mechanism. b. Horn blowing mechanism energizes horn relay (R-1) which actuates relay (R-2) of counter 2.
26、c. Horn depressing mechanism, operated by air cylinder, also actuates micro-switch 2, and thereby counter 1. Analysis: a. R-1, R-2 and counter 2 indicate number of successful test cycles, and thereby provide the determining test cycle count. b. Micro-switch 2 and counter 1 indicate only the number o
27、f mechanical actuations of horn blowing mechanism. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14599 Copyright 2012 General Motors Co
28、mpany All Rights Reserved March 2012 Page 5 of 6 Data Sheet A1: Instrument Calibration Report Number: _ Submit this data sheet with the other data sheets when the information is not otherwise preserved in the testing laboratory records. Test Procedure Number: GMW14599 Test Date: _ Instrument Descrip
29、tion Instrument Number Calibration Date Next Calibration Due Date 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Recorded by: Date: (Signature) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without
30、license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14599 Copyright 2012 General Motors Company All Rights Reserved March 2012 Page 6 of 6 Data Sheet A2: Horn Blowing Mechanism Durability (Steering Wheel) Horn Blowing Mechanism Durability Test/Report Number (Steering Wheel) Report Date Part D
31、ata Vehicle Make Model Year Assembly or Component Part Number Source Prototype or Production Test Data 4.1.4 Record initial operation comments (dead spots, high effort, etc.) 4.3.5 Record the following: Cycles completed Test Location 1 Test Location 2 After test operation comments (dead spots, high effort, etc.) Structural condition of the mechanism Effort Required to Actuate Horn N Tested by: Date (Signature) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
