Tractor and Trailer Brake System Compatibility

Radlinski, R W; Flick, M A

doi:10.4271/861942

Cited by 14 publications

(4 citation statements)

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“…Because of the road safety, agricultural vehicles braking systems must meet several specific requirements [8,9] for braking performance, high operation speed during rapid braking (the response time should not exceed 0.6 s) and the compatibility of the tractor and towed vehicle braking systems [27] (the synchrony of operation of individual circuits). Research by Scarlett [28] reveals that 90% tested trailers failed to achieve the legally required braking efficiency level.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the functional and service characteristics of the pneumatic system of an agricultural tractor with mechanical brakes using simulation methods

Kamiński¹,

Kulikowski²

2015

EiN

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Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl KAmińsKi Z, KuliKowsKi K. Determination of the functional and service characteristics of the pneumatic system of an agricultural tractor with mechanical brakes using simulation methods. Eksploatacja i Niezawodnosc -maintenance and Reliability 2015; 17 (3): 355-364, http:// dx.doi.org/10.17531/ein.2015.3.5. Zbigniew KAmińsKi Krzysztof KuliKowsKiDetermination of the functional anD service characteristics of the pneumatic system of an agricultural tractor with mechanical brakes using simulation methoDs wyznaczanie metoDami symulacyjnymi właściwości funkcjonalnoużytkowych pneumatycznej instalacji ciągnika rolniczego z hamulcami mechanicznymi* IntroductionIn agricultural tractors, a variety of friction braking mechanisms are used, including band brakes, drum brakes, and dry or wet multidisc brakes [5]. To transfer the energy needed to run the service brakes of a tractor, a mechanical, hydraulic or an air drive is used. Selection of the drive type and the energy source depends on the design and weight of the tractor. In low-and medium-power tractors, manually operated hydraulic brake systems are used, which are relatively inexpensive and simple. Because of their cost, mechanically actuated brakes are still attractive in low-power tractors.Agricultural tractors with mechanical or hydraulic brakes are equipped with a pneumatic system designed to run the air braking systems of towed trailers and agricultural machines. So called combined systems are currently used [32], which have the capability to operate with the single-and dual-line braking systems of towed vehicles.A typical combined pneumatic system of a farm tractor consists of two major parts: an energy supply unit and a control device. The function of the energy supply unit is to compress and purify air and to maintain the adequate pressure in the tractor and trailer reservoirs in order to ensure the required trailer braking performance. The role of the control device is to provide the follow-up control of the single-or dual-line braking system of a towed vehicle in a manner that enables the synchronous braking of the both vehicles. Control devices differ mainly in the type of the trailer brake control valve, which can be actuated either mechanically, hydraulically or pneumatically, deEksploatacja i NiEzawodNosc -MaiNtENaNcE aNd REliability Vol.17, No. 3, 2015 356 sciENcE aNd tEchNology pending on the tractor brakes [32]. A schematic diagram of a tractor's pneumatic system with a mechanically actuated brake valve is shown in Figure 1.Because of the road safety, agricultural vehicles braking systems must meet several specific requirements [8,9] for braking performance, high operation speed during rapid braking (the response time should not exceed 0.6 s) and the compatibility of the tractor and towed vehicle braking systems [27] (the synchrony of operation of individual circuits). Research by Scarlett [28] reveals that ...

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Section: Introductionmentioning

confidence: 99%

“…Using the relationship R/c v = κ-1 and combining equations (22), (23) and (27) leads to the following differential equations for air pressure variation in the brake chamber V 1 and the valve chamber V 2 :…”

mentioning

confidence: 99%

Determination of the functional and service characteristics of the pneumatic system of an agricultural tractor with mechanical brakes using simulation methods

Kamiński¹,

Kulikowski²

2015

EiN

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“…2. Another issue that might play a significant role in implementing these diagnostic schemes, particularly in tractor-trailer combinations, is that of the compatibility between the brake system in the tractor and the trailer [104]. This might be important since different trailers (possibly with varying components and brake system layouts) may be attached to a tractor during its operation.…”

Section: B Scope Of Future Workmentioning

confidence: 99%

A Diagnostic System for Air Brakes in Commercial Vehicles

Subramanian

Darbha

Rajagopal

2006

IEEE Trans. Intell. Transport. Syst.

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“…In order to adjust the distribution of braking forces between a tractor and a towed vehicle, compatibility requirements have been introduced for the first time in the form of permissible change areas for the braking rate of a towing vehicle and a towed vehicle in a pressure function in the control line. The compliance with compatibility requirements as well as requirements regarding high-speed operation (response time of less than 0.6 s [2]), contribute to the shortening of braking distance of tractor-trailer units and the reduction of forces in the coupling during emergency braking [21].…”

Section: Introductionmentioning

confidence: 99%