Effect of Differential Steering Assist on Drift Running Performance

Nozaki, Hiromichi

doi:10.4271/2005-01-3472

Cited by 19 publications

(6 citation statements)

References 1 publication

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“…On the other hand, Nozaki reports that Differential Steering Assist (DSA) is effective as it can reduce the countersteer delay in drift cornering [7]- [9]. We hypothesized that the combination of differential steering assists and the variable steering system proposed in the present study promises to be significantly effective; therefore, we also investigated this cooperative control method.…”

Section: Introductionmentioning

confidence: 95%

Variable Gear Ratio Control Using Vehicle Body Slip Angle

Yoshino¹,

Nozaki²

2014

ENG

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Vehicles with variable steering characteristics have long been studied and compared with those having typical fixed gear ratio steering, and the variable gear ratio properties are reported to have improved maneuverability and stability in high-speed lane changes and on slippery low-friction road surfaces. However, it is not clear how gear ratios should be set for individual vehicle characteristics. Therefore, the present study has investigated a variable steering gear system using body slip angle feedback for the purpose of improved maneuverability and stability in the critical cornering range and upwards, in excess of the critical limit, and into the countersteer range. The results of a driving simulator experiment show that the steering effect improves and maneuverability and stability increase in the critical cornering range and upwards, in excess of the critical limit, and into the countersteer range by applying linear-variable control to the steering ratio from a body slip angle of 5˚. This result is seen both in double lane changes, such as in hazard avoidance, and in J-turns with long drifting. Moreover, it shows an improvement in drift controllability through prompt countersteering. Overall, the present system can enhance the driver's hazard avoidance capability.

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Section: Introductionmentioning

confidence: 95%

Variable Gear Ratio Control Using Vehicle Body Slip Angle

Yoshino¹,

Nozaki²

2014

ENG

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“…Because of this problem, drivers evaluated the proportional derivative (PD) steering wheel to be inferior to a general steering method for circle turns. However, Nozaki recently reported that PD steering assistance was very effective because it was able to improve the counter steering delay that occurs during drift cornering (Nozaki, 2005). Therefore, in this research, an examination was performed under the assumption that a notable benefit could be achieved by controlling the steering methods according to cornering, lane changes, drift cornering, and various other driving situations.…”

Section: Introductionmentioning

confidence: 97%

Proper PD steering assistance constant based on the driving situation

Nozaki

Makita

Masukawa

2011

Int.J Automot. Technol.

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Proportional derivative (PD) steering assistance can greatly improve the control stability of a vehicle. However, for all PD steering methods, the discomfort associated with the need to continuously turn the steering wheel during cornering is significant. Because the steering return phenomenon of the steering wheel stop like this is not preferable, PD steering assistance should be extremely weak (almost 0) during normal cornering. Alternatively, during drift cornering, during which the grip area of the tires is exceeded, PD steering assistance is helpful because the driver has good control over countersteering. Moreover, the use of PD steering assistance is preferable during lane changes because the response and settling of a vehicle is greatly improved when PD steering assistance is used. Based on these considerations, a previous report examined steering method controls in which the PD steering assistance constant was incorporated along with the drivers' perception changes in certain driving situations. This study aimed to determine a suitable PD steering assistance constant in relation to the driving situation. A proper PD steering assistance constant was found to exist for specific driving situations. Based on the results of gaze detection using an eye mark recorder, the study was able to reduce the right and left difference of the gaze at the driver by controlling PD steering assistance using a proper PD steering assistance constant for various driving situations.

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“…Besselink [7] has proposed an integration of steering system and traction system, which was also about how to utilize differential drive torque of rear axle to assist steering and improve vehicle's steering performance. Some other researchers such as Jang et al [8], Nozaki [9] and so on, also have proposed the measure of utilizing differential braking torque to correct steering maneuver. All of them mentioned above discussed the assisted steering measure using differential traction/braking torque, but not considered a power steering measure to reduce the steering effort at all.…”

Section: Introductionmentioning

confidence: 99%