US 12,246,712 B2
Vehicle constant speed travel control method and vehicle constant speed travel control device
Sergio Rossi, Kanagawa (JP); Shuhei Kitta, Kanagawa (JP); and Michiharu Gunji, Kanagawa (JP)
Assigned to Nissan Motor Co., Ltd., Yokohama (JP)
Appl. No. 17/642,269
Filed by Nissan Motor Co., Ltd., Yokohama (JP)
PCT Filed Oct. 8, 2019, PCT No. PCT/JP2019/039718
§ 371(c)(1), (2) Date Mar. 11, 2022,
PCT Pub. No. WO2021/070268, PCT Pub. Date Apr. 15, 2021.
Prior Publication US 2022/0297690 A1, Sep. 22, 2022
Int. Cl. B60T 8/32 (2006.01); B60W 30/14 (2006.01)
CPC B60W 30/143 (2013.01) [B60W 2510/1005 (2013.01); B60W 2520/10 (2013.01); B60W 2530/16 (2013.01); B60W 2530/203 (2020.02); B60W 2540/106 (2013.01); B60W 2720/10 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A vehicle constant speed travel control method comprising executing the following operations during a constant speed travel control of a vehicle:
calculating a target driving power for the vehicle based on a difference between a target vehicle speed and an actual vehicle speed;
setting a target accelerator pedal opening to be used for calculating a gear ratio in accordance with the actual vehicle speed, the target accelerator pedal opening being set based on the target driving power;
determining whether the vehicle is in a towing state or a non-towing state;
selecting a towing-state shift line or a non-towing-state shift line in accordance with the towing state or the non-towing state that was determined, each of the towing state-shift line and the non-towing state shift line depicting a relationship of the target accelerator pedal opening with respect to the actual vehicle speed, the towing-state shift line being different from the non-towing-state shift line, and
setting a target gear ratio based on the target accelerator pedal opening and the actual vehicle speed by using the towing-state shift line or the non-towing-state shift line that was selected, the target gear ratio being set to a higher gear ratio when the vehicle is in the towing state than when the vehicle is in the non-towing state, wherein
for the same target driving power, the target accelerator pedal opening is set to be smaller when the vehicle is in the towing state than when the vehicle is in the non-towing state.