CPC B60W 30/18072 (2013.01) [B60W 30/09 (2013.01); G01M 17/025 (2013.01); B60W 2030/1809 (2013.01); B60W 2520/10 (2013.01); B60W 2530/20 (2013.01); B60W 2710/18 (2013.01); B60W 2720/106 (2013.01); G07C 5/0808 (2013.01)] | 13 Claims |
1. A tire noise test method to be conducted while a vehicle is driven automatically, comprising:
operating a control unit including at least one processor when the vehicle reaches a predetermined position or reaches a predetermined speed, for putting the vehicle into coast-traveling with a prime mover of the vehicle in a non-driving state;
operating a measuring unit for measuring tire noise during the coast-traveling of the vehicle;
operating the control unit to subtract a vehicle speed at a starting point of a tire noise measuring zone, from a vehicle speed at the time point of starting the coast-traveling, thereby calculating a speed reduction amount when a first tire noise test has been conducted; and
operating the control unit to add a preset speed at the start point of the zone for measuring the tire noise in a next tire noise test and said speed reduction amount, thereby to calculate the predetermined speed for a next tire noise test.
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