Behavior of Closed Loop Control System Consisting of a Powertrain and a Human Controller and HMI Point of View

Authors

Dr. K. Togai, Osaka Sangyo University, Japan

Year

2020

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 813

Summary

Human driving behavior consists of target (path and velocity) planning and actual vehicle control based on the target. Driver has to learn how to control the vehicle. Once learned, target planning and control are done unconsciously. Vehicle response property learned affects the target planning. Hand tools are considered as extended hand. A vehicle may be felt as further extending human body in driving.
A target plant can be described with operation gain and response in a control system.
Torque response of a gasoline engine is depending on the plenum chamber volume and cylinder displacement ratio if air fuel ratio is set at stoichiometric. That of diesel engine is depending on only fuel injection delay if air is supplied sufficiently. However, turbo-charging process takes a few second to boost air supply to combustion chambers and the delay time can be calculated with a transfer function. Torque response of an electric motor, only depending on current, is quicker than that of ICEs. And the operation gain is rather linear than ICEs. A brake system has smaller response time comparing with an ICE and more liner operation gain to applied pedal force.
A closed loop system included a human controller, i.e. a driver, to be constructed and a powertrain. And stability and target error are to be analyzed with transfer functions of a driver and a powertrain. From published papers, control performance deterioration is expected and the deterioration is to be quantitively shown. Desired X-by-wired powertrain property is to be mentioned.