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Assessment of Road Factors in Vehicle Performance during Exploitation
Technical Paper
2022-01-5077
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
Automotive Technical Papers
Language:
English
Abstract
Vehicle practices sometimes require rapid assessment of the road gradient. The
most common means to this is a satellite navigator with a barometric altimeter
(BA). However, this is not always possible due to local or weather conditions.
For such cases, the method of points of equal velocity (PEV) was proposed to
measure parameters of the car forward movement and then of reverse movement
through the same point and at the same speed and calculate the necessary
road/car parameters. Driving through the same point in opposite directions at
the same speed eliminates the unknown grade and rolling resistance, after which
the system of equations is solved with a minimum of assumptions. Detailed
recommendations given on measurements with the global positioning system
(GPS)/Global Navigation Satellite System (GLONASS) navigator with BA and
processing of results based on the author’s practical experience and because of
their absence in the manuals. The error of the gradient values obtained after
the required number of runs is less than ±0.001. The theory of the PEV method
detailed recommendations for measuring and processing the results are given.
Results of gradient determining do not depend much on the wind (oscillations
from the average to 1%) and on the correctness of the vehicle
Cd assessment (oscillations to 2%). The longitudinal profiles obtained by
both methods are compared. The difference of gradients by the PEV method with
the one by BA method is about 1 ppm on a smooth road and about 2 ppm on a
steeper road with local pavement damage. Analysis and experiments have shown
that in simple tasks it is possible to use the PEV method with an imported track
from less accurate measuring instruments (5 decimal places) and to use old video
records of display indications.
Authors
- Ernest Rabinovich - Technical Maintenance and Automobile Service, Kharkiv Nation
- Igor Gritsuk - Kherson State Maritime Academy
- Mikhail Buravtsev - Kharkov National Automobile Highway University
- Vladimir Zuiev - Kharkov National Automobile Highway University
- Viktoriia Ryzhova - International Technological University “Mykolayiv
- Mykyta Volodarets - Pryazovskyi State Technical University
Citation
Rabinovich, E., Gritsuk, I., Buravtsev, M., Zuiev, V. et al., "Assessment of Road Factors in Vehicle Performance during Exploitation," SAE Technical Paper 2022-01-5077, 2022, https://doi.org/10.4271/2022-01-5077.Also In
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