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Active accelerator pedal: speed feedback aided driving
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

An accelerator pedal with feedback can be used to assist the driver to drive at a constant speed and to remain within the speed limits, especially today when the cars are quieter and the roads are better. Therefore, it is desirable to inform the driver when the speed is higher than desired. Earlier studies have shown that a force in the accelerator pedal was preferable if the speed should be used as feedback to the driver. There are other projects with the purpose to inform the driver. Vägverket have ongoing studies with sound, pedal vibration and pedal force as feedback. A prototype of an accelerator pedal with a force in the pedal as speed feedback has been developed. A safe failure mode and minimised energy consumption are some of the features that the active accelerator pedal holds. Feedback characteristics are based on the result of earlier studies. A speed feedback assists the driver to maintain the desired speed and inform when the speed is too high. The driver can be more focused on the surrounding environment instead of looking at the speedometer. The driver safety is also increased if the speed limits are better observed. This is an active safety function, since accidents can be prevented or mitigated if the system is used as intended. Fuel-consumption might also be reduced due to smoother driving. The feedback force in the pedal is applied in two ramp functions. One ramp informs the driver that the set-speed has been reached and also allows a comfortable pedal resistance for the foot near the set-speed. The other ramp warns the driver that the speed is too high. The driver has always the possibility to exceed the pre-set speed. A product development method has been used to ensure the quality and safety of the active accelerator pedal. A prototype has been developed so that function test could be carried out in a car. Some 40 persons have tested the prototype with mainly positive comments. Most drivers can find the desired speed without looking at the speedometer, which was one of the purposes with the work. All the drivers that have tested the pedal feel when they drive faster than the pre-set speed. This master thesis has been carried out at Volvo Car Corporation and it is classified.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Active pedal, Accelerator pedal, Speed feedback, Force, feedback, Active safety, Speed limiter
Keyword [sv]
URN: urn:nbn:se:ltu:diva-45713ISRN: LTU-EX--01/320--SELocal ID: 36311904-2585-4c9a-a6c6-66bb2f70fce3OAI: diva2:1019010
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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