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Experimental and survey-based evaluation of a low-cost ABS system (ABS compact)
Published September 18, 1995 by ISATA - Dusseldorf Trade Fair in United Kingdom
Event: ISATA 1995
In the subcompact class not even 10% of the cars are equipped with ABS (antilock brake systems). The reason for the low market penetration in this section is first of all the high price as well as the merely optional offering and on the other hand the attractiveness of alternative equipment.
On this background a low-cost solution called ""ABS-compact"" has been developed providing full ABS functionality combined with two typical characteristics:
- the operational duration of an ABS braking is limited (in ABS mode to standstill from 150 km/h on wet or dry roads, 135 km/h on snowed up roads and 65 km/h on icy roads) and
- during an ABS braking the brake pedal is slowly moving downwards (receding brake pedal) by the driver but without the ABS-typical pulsation.
Braking experiments on a test track were carried out with a sample of 64 ""naive"" drivers in a subcompact car. In addition to that a survey with 500 representative quoted subjects - again all subcompact car drivers - was carried out.
Objectivesof the study have been the determination of driver and system behavior with ABS-compact, the overall product acceptance of the system and the differences to the usual ABS system.
During the braking with usual ABS, a higher level of brake pressure was observed. Although there was less brake pressure input with the ABS-compact system, exactly the same deceleration and stopping distance rates for both systems were detected on low friction.
With both systems a similar learning process was observed. From the first to the fifth braking the pressure input was increasing continually.
The acceptance of ABS-compact is on the whole determined by three factors: the price difference, the duration of ABS function and the perception of the system especially of the pedal characteristic. The statements of the subjects concerning these factors let us expect a high product acceptance.
- M. Brockman - TÜV Rheinland e.V.
- S. Becker - TÜV Rheinland e.V.
- O. Hofmann - TÜV Rheinland e.V.
- A. Mertens - TÜV Rheinland e.V.
- J. Mihm - TÜV Rheinland e.V.
- A. Sonntag - TÜV Rheinland e.V.
- J. Sonntag - TÜV Rheinland e.V.
- H. J. Feigel - ITT Automotive Europe GmbH
- P. Rieth - ITT Automotive Europe GmbH