Development of an Australian Brake balance Code of Practice. Peter Hart Hartwood Consulting

Transcription

1 Development of an Australian Brake balance Code of Practice Peter Hart Hartwood Consulting

2 Overview The Australian Road Transport Suppliers Associa4on is developing an Australian Brake Balance Code of Prac4se for heavy combina4on vehicles.

3 Overview The Australian Road Transport Suppliers Associa4on is developing an Australian Brake Balance Code of Prac4se for heavy combina4on vehicles. The project is being financially supported by the NTC, NSW RTA and VicRoads. Hopefully QT will contribute to tes4ng costs.

4 Purpose To provide industry with guidance about good brake balance prac4ces for combina4ons.

5 Purpose To provide industry with guidance about good brake balance prac4ces for combina4ons It is mainly concerned with compa4bility brake balance (I.e. between vehicles)

6 Purpose To provide industry with guidance about good brake balance prac4ces for combina4ons. It is mainly concerned with compa4bility brake balance (I.e. between vehicles). And threshold pressure balance.

7 Context The applica4on of electronics to braking and stability is revolu4onary.

8 Context The applica4on of electronics to braking and stability is revolu4onary. The range of brake characteris4cs that can be mixed is increasing drama4cally

9 Context The applica4on of electronics to braking and stability is revolu4onary. The range of brake characteris4cs that can be mixed is increasing drama4cally Australia has never regulated unladen brake balance.

10 Context The applica4on of electronics to braking and stability is revolu4onary. The range of brake characteris4cs that can be mixed is increasing drama4cally Australia has never regulated unladen brake balance. There is no history of use of load- sensing braking systems in Australia

11 Brake Technologies

12 Brake Technologies

13 Brake Technologies

14 Trailer EBS Valve with Roll Stability

15 A Simplified Classification

16 Disc Brakes Specified on 10-15% of new vehicles

17 The Australian Mix The new truck mix in Australia is approximately: 30% Australian (KW, Mack) 30% North American 30% European 10% Japanese New trailers: 95% Australia 5% Chinese and European

18 Summary of Brake Control Technologies Since 1995 ADRs 35 and 38 have had laden compa4bility limits.

19 Design Rule Compatibility Since 1998 ADRs 35 and 38 have had laden compa4bility limits.

20 Design Rule Compatibility Since 1995 ADRs 35 and 38 have had laden compa4bility limits.

21 Design Rule Compatibility Recently op4onal unladen compa4bility limits were added.

22 Design Rule Compatibility Recently op4onal unladen compa4bility limits were added.

23 National HV Braking Strategy

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25 Fundamental Questions Does electronic brake control always make things beyer?

26 Fundamental Questions Does electronic brake control always make things beyer? What brake levels should the truck assume for the trailer?

27 Fundamental Questions Does electronic control always make things beyer? What brake levels should the truck assume for the trailer? Is it OK to mix and match vehicles with and without load- sensing brakes?

28 Fundamental Questions Does electronic control always make things beyer? What brake levels should the truck assume for the trailer? Is it OK to mix and match vehicles with and without load- sensing brakes? What problems arise when disc and drum brakes are mixed?

29 New Adjustment Capabilities

30 New Adjustment Capabilities

31 Proposed Standards A performance standard is proposed for heavy vehicle braking: A (combina+on) vehicle should be able to achieve at least half the theore+cally possible decelera+on at 60km/h without exhibi+ng gross wheel lock- up. irrespec4ve of the loading or road condi4ons

32 Gross Wheel Lock-Up Gross wheel lock- up means any sustained wheel lock- up on: a single- or boggy- axle group OR more than one axle in tri- or quad- axle group.

33 Gross Wheel Lock-Up

34 Brake Code Principles It is desirable to use the same brake control technologies on all vehicle parts.

35 Threshold Pressure Recommendation Threshold pressures on a combina4on vehicle be within a 10kPa (2 psi) range.

36 Threshold Pressure Recommendation Threshold pressures on a combina4on vehicle be within a 10kPa (2 psi) range. The design threshold pressure level be 70kPa.

37 Threshold Pressure Recommendation

38 Brake Code Principles It is desirable to use the same brake control technologies on all vehicle parts. If this is not done, then at least use the same technologies on the trailers.

39 Brake Code Principles It is desirable to have adap4ve brake control technology on each vehicle part.

40 Brake Code Principles It is desirable to have adap4ve brake control technology on each vehicle part. It is desirable to have an4- lock protec4on on each vehicle part.

41 A Five-Level Classification

42 A Five-Level Classification

43 A Five-Level Classification

44 A Five-Level Classification Note that the Code s recommenda4ons can be proven by calcula4ons. Vehicles in low categories may meet the performance standard.

45 A Five-Level Classification Note that the Code s recommenda4ons can be proven by calcula4ons. Vehicles in low categories may meet the performance standard. A vehicle with adequate brake capacity will meet the performance standard if it has working ABS brakes on each part.

46 Recommendations Note that the Code s recommenda4ons can be proven by calcula4ons. Vehicles in low categories may meet the performance standard. A vehicle with adequate brake capacity will meet the performance standard if it has working ABS brakes on each part.

47 Code Format A wriyen Code of Prac4ce in six parts

48 Code Format A wriyen Code of Prac4ce in six parts A brake calculator available via the web

49 Code Format A wriyen Code of Prac4ce in six parts A brake calculator available via the web A guidance program that describes the poten4al performance issues / levels available via the web.

50 Code Format 1. Selec4ng Vehicles For Combina4ons 2. Set- Ups to Achieve Brake Balance 3. Workshop Guide 4. Australian Heavy- Vehicle Brake Rules and Performance Levels 5. A Review of Electronically Controlled Brake Technologies 6. Brake Calcula4ons and Examples

51 Finally Thank you for listening!