- Email: [email protected]
traction forces
98
Abstracts / JSAE Review 19 (1998) 89-109
control performance evaluation, we clarified the input/output characteristics of the brake booster with which the driver will experience minimal discomfort during booster control. We adopted the auxiliary variable pressure chamber type construction for the brake booster. This construction minimizes the volume of required airflow, which in turn allows the use of a compact solenoid valve and eliminates the need for a release switch. As a result, we realized a system that provides a high level of fail-safe performance.
9732180 Stabilizing Friction Coefficient of Disc Brake Pad in Cold Conditions Masaaki Kobayashi, Motoi Hyoudou (Aisin Seiki Co., Ltd.) We improved the brake squeak phenomenon which is caused after the vehicle is left over night in winter. As a result, we found an increase of friction coefficient when brake squeal occurred. Moreover, it is found that absorbed water on the frictional surface has an effect on the friction coefficient behavior, and decided on effective treatments to lower the friction coefficient under cold conditions. 9732199 Handling Analysis Using Tire Model with Neural Networks Koji Sato, Manabu Kato, Keiji lsoda (Mitsubishi Motors Corporation) In order to adapt to more practical conditions with high accuracy, such as a marginal condition, the technology of vehicle dynamics simulation has been significantly developed. The paper describes a tire model achieving an effective method to reproduce tire measurement results using neural networks and its application to vehicle dynamics under the condition of deceleration in a turn. The same vehicle model constructed in ADAMS is used for an analysis of lateral transient response. The simulation results showed satisfactory correspondence with the test results even in such marginal turning conditions. 9732207 Direct Yaw Moment Control Depending on Tire Lateral Force Monitoring Yashimi Furukawa (Honda R&D Co., Ltd.), Masato Abe (Kanagawa Institute of Technology) A control law for the direct yaw moment control (DYC) is introduced. The control strategy is a sliding control based upon the tire lateral force monitoring by using the on-board-tire-model. The significant effects of the chassis control on improving the limit handling performance are proved with the computer simulation. The effects of the sliding surfaces on the vehicle performance are discussed. 9732216 Study on Integrated Control of Active Rear Wheel Steering and Braking/Traction Forces Masao Nagai, Sachiko Yamanaka, Yasuhiro Saito (Tokyo University of Agriculture and Technology), Yutaka Hirano (Toyota Motor Corporation) An integrated control system of active rear wheel steering and yaw moment control using braking/traction forces is presented in this paper. Because of the tire nonlinearity, vehicle handling performance is improved but limited to a certain extent only by steering control. Direct yaw moment control using braking/traction forces is effective not only in linear but also nonlinear ranges of tire friction circle. The proposed control system is a model matching controller which makes the vehicle follow the desired dynamic model. This shows that vehicle handling performance is much improved by the integrated control system. 9732225 Improvement of Vehicle Position Measurement Accuracy by Use of Kalman Filter Takehiko Fujioka, Torahiko Yamanouchi (The University of Tokyo) Magnetic nails are often used as position sensors for Automated Highway System. The positions of the nails are usually not so accurate because of construction cost. Lateral deviations measured on vehicles will include position errors. In this paper, the method of reducing the position errors by use of Kalman filter is shown and the effect of Kalman filter is confirmed by simulations.
9732234 On Measurement of 4 Axial Direction Forces Acting Upon Wheel Axle Structure of Vehicle - Part 1 Proposal of New Sensing and Examination by Static Experiments Nagao Miyazaki, Hiroshi Onishi, Hideki Sonoda, Tomohiro Yamaguchi (Japan Electronics Industry Ltd.) The behavior of a vehicle is found by measuring three-dimensional forces acting between the road surface and tire. A report is presented here on the new sensing device, in which a strain gauge is used to measure the three directional forces (Fx, F r, Fz) acting on the wheel axle structure during running, as well as the braking force (Fb). Its effectiveness is confirmed by experiments. Since this sensing device can make real time measurements, unlike the multi-component force transducers on the market, it seems applicable to the next generation of vehicle control systems like VDC, ASV and especially ABS. 9732243 A Study of Driving a Vehicle with the Control Stick - Considering the Lateral Motion Ippei Yamazaki, Minoru Kamata, Kenji Okamura, Hironori Narita (The University of Tokyo) In order to improve elderly or disable people's mobility, a device which allows control by the driver's own ability in safety with the easy-operation-vehicle is required. In this study, we considered the easy-operation-vehicle equipped with a control stick. The responses of the stick-controlled-vehicle are calculated by numerical simulations and the feeling of the stick control is investigated by a driving simulator system which has a stick reacting torque. 9732252 Automatic Path Tracking Using Linear Quadratic Control Theory - Control Method for a Straight path Hiroshi Mouri, Hiroyuki Furusho (Nissan Motor. Co., Ltd.) An AHS field test was conducted in September 1996 on an unopened highway in which we investigated the application of optimal control (LQ) to path tracking. This paper describes the advantages and significance of the LQ controller. First, LQ is compared with PD control to show the limits of the latter when pursuing both good path tracking performance and ride comfort. Next, it is shown that improved control of lateral deviation tends to separate yaw and lateral motion. Finally, a controller based on integral action (LQI) is presented which achieves high response and high damping simultaneously. 9732261 Automatic Path Tracking Using Linear Quadratic Control Theory - Control Method for a Curved Path Hiroyuki Furusho, Hiroshi Mour (Nissan Motor Co., Ltd.) The first paper dealt with a controller for tracing a straight path using the linear quadratic (LQ) control theory. This paper deals with the control method for tracing a curved path. The first part describes a case in which the curvature of the desired path is known. The controller is configured with a set-point regulator which treats the state value of the vehicle at the equilibrium point as feed-forward information. The second half presents a controller for tracing the desired path without feed-forward information. The road curvature is estimated by a Kalman filter in which the change in curvature is approximated using a first-order delay model. Simulation and experimental data are presented to show the tracking performance of the vehicle. 9732289 Application of New RTM (Resin Transfer Molding) Process for Automotive Exterior Panels - Its Application for Air Deflector and its Verification for Mold of Bumper Parts Seiji Ezoe, Yosimi Onda (Isuzu Motors Ltd.) We have developed new Resin Transfer Molding process to be applied to new individualized automobiles, used for medium and large size exterior panels in small or medium quantity production. Its key technology for reducing cost is attained by the FRP trimmingless and pinholeless gelcoat material. Reduced investment is attained by a simple low pressure molding machine and multi-cavity mold.
Abstracts / JSAE Review 19 (1998) 89-109
control performance evaluation, we clarified the input/output characteristics of the brake booster with which the driver will experience minimal discomfort during booster control. We adopted the auxiliary variable pressure chamber type construction for the brake booster. This construction minimizes the volume of required airflow, which in turn allows the use of a compact solenoid valve and eliminates the need for a release switch. As a result, we realized a system that provides a high level of fail-safe performance.
9732180 Stabilizing Friction Coefficient of Disc Brake Pad in Cold Conditions Masaaki Kobayashi, Motoi Hyoudou (Aisin Seiki Co., Ltd.) We improved the brake squeak phenomenon which is caused after the vehicle is left over night in winter. As a result, we found an increase of friction coefficient when brake squeal occurred. Moreover, it is found that absorbed water on the frictional surface has an effect on the friction coefficient behavior, and decided on effective treatments to lower the friction coefficient under cold conditions. 9732199 Handling Analysis Using Tire Model with Neural Networks Koji Sato, Manabu Kato, Keiji lsoda (Mitsubishi Motors Corporation) In order to adapt to more practical conditions with high accuracy, such as a marginal condition, the technology of vehicle dynamics simulation has been significantly developed. The paper describes a tire model achieving an effective method to reproduce tire measurement results using neural networks and its application to vehicle dynamics under the condition of deceleration in a turn. The same vehicle model constructed in ADAMS is used for an analysis of lateral transient response. The simulation results showed satisfactory correspondence with the test results even in such marginal turning conditions. 9732207 Direct Yaw Moment Control Depending on Tire Lateral Force Monitoring Yashimi Furukawa (Honda R&D Co., Ltd.), Masato Abe (Kanagawa Institute of Technology) A control law for the direct yaw moment control (DYC) is introduced. The control strategy is a sliding control based upon the tire lateral force monitoring by using the on-board-tire-model. The significant effects of the chassis control on improving the limit handling performance are proved with the computer simulation. The effects of the sliding surfaces on the vehicle performance are discussed. 9732216 Study on Integrated Control of Active Rear Wheel Steering and Braking/Traction Forces Masao Nagai, Sachiko Yamanaka, Yasuhiro Saito (Tokyo University of Agriculture and Technology), Yutaka Hirano (Toyota Motor Corporation) An integrated control system of active rear wheel steering and yaw moment control using braking/traction forces is presented in this paper. Because of the tire nonlinearity, vehicle handling performance is improved but limited to a certain extent only by steering control. Direct yaw moment control using braking/traction forces is effective not only in linear but also nonlinear ranges of tire friction circle. The proposed control system is a model matching controller which makes the vehicle follow the desired dynamic model. This shows that vehicle handling performance is much improved by the integrated control system. 9732225 Improvement of Vehicle Position Measurement Accuracy by Use of Kalman Filter Takehiko Fujioka, Torahiko Yamanouchi (The University of Tokyo) Magnetic nails are often used as position sensors for Automated Highway System. The positions of the nails are usually not so accurate because of construction cost. Lateral deviations measured on vehicles will include position errors. In this paper, the method of reducing the position errors by use of Kalman filter is shown and the effect of Kalman filter is confirmed by simulations.
9732234 On Measurement of 4 Axial Direction Forces Acting Upon Wheel Axle Structure of Vehicle - Part 1 Proposal of New Sensing and Examination by Static Experiments Nagao Miyazaki, Hiroshi Onishi, Hideki Sonoda, Tomohiro Yamaguchi (Japan Electronics Industry Ltd.) The behavior of a vehicle is found by measuring three-dimensional forces acting between the road surface and tire. A report is presented here on the new sensing device, in which a strain gauge is used to measure the three directional forces (Fx, F r, Fz) acting on the wheel axle structure during running, as well as the braking force (Fb). Its effectiveness is confirmed by experiments. Since this sensing device can make real time measurements, unlike the multi-component force transducers on the market, it seems applicable to the next generation of vehicle control systems like VDC, ASV and especially ABS. 9732243 A Study of Driving a Vehicle with the Control Stick - Considering the Lateral Motion Ippei Yamazaki, Minoru Kamata, Kenji Okamura, Hironori Narita (The University of Tokyo) In order to improve elderly or disable people's mobility, a device which allows control by the driver's own ability in safety with the easy-operation-vehicle is required. In this study, we considered the easy-operation-vehicle equipped with a control stick. The responses of the stick-controlled-vehicle are calculated by numerical simulations and the feeling of the stick control is investigated by a driving simulator system which has a stick reacting torque. 9732252 Automatic Path Tracking Using Linear Quadratic Control Theory - Control Method for a Straight path Hiroshi Mouri, Hiroyuki Furusho (Nissan Motor. Co., Ltd.) An AHS field test was conducted in September 1996 on an unopened highway in which we investigated the application of optimal control (LQ) to path tracking. This paper describes the advantages and significance of the LQ controller. First, LQ is compared with PD control to show the limits of the latter when pursuing both good path tracking performance and ride comfort. Next, it is shown that improved control of lateral deviation tends to separate yaw and lateral motion. Finally, a controller based on integral action (LQI) is presented which achieves high response and high damping simultaneously. 9732261 Automatic Path Tracking Using Linear Quadratic Control Theory - Control Method for a Curved Path Hiroyuki Furusho, Hiroshi Mour (Nissan Motor Co., Ltd.) The first paper dealt with a controller for tracing a straight path using the linear quadratic (LQ) control theory. This paper deals with the control method for tracing a curved path. The first part describes a case in which the curvature of the desired path is known. The controller is configured with a set-point regulator which treats the state value of the vehicle at the equilibrium point as feed-forward information. The second half presents a controller for tracing the desired path without feed-forward information. The road curvature is estimated by a Kalman filter in which the change in curvature is approximated using a first-order delay model. Simulation and experimental data are presented to show the tracking performance of the vehicle. 9732289 Application of New RTM (Resin Transfer Molding) Process for Automotive Exterior Panels - Its Application for Air Deflector and its Verification for Mold of Bumper Parts Seiji Ezoe, Yosimi Onda (Isuzu Motors Ltd.) We have developed new Resin Transfer Molding process to be applied to new individualized automobiles, used for medium and large size exterior panels in small or medium quantity production. Its key technology for reducing cost is attained by the FRP trimmingless and pinholeless gelcoat material. Reduced investment is attained by a simple low pressure molding machine and multi-cavity mold.