Abstract:
The throttle cable has almost become redundant on today's motor vehicle. The drive-by-wire system has now found its way onto other vehicles with humbler routes and can be found on base models. Historically a mechanical linkage between the accelerator pedal and the throttle butterfly has always existed, be it via a cable or via rods and linkages. These have now been replaced by sophisticated electronic control modules, sensors and actuators. This system is also referred to 'Fly-by-Wire'.
In order to implement electronically variable dynamics for vehicle handling, the control System requires an accurate knowledge of the vehicle states as well as a means of actuation to precisely influence the vehicle's motion. Steer-by-wire capability conveniently addresses both of these requirements. This paper presents an approach to estimating vehicle sideslip angle using steering torque information. This method is especially suited to vehicles equipped with steer-by-wire since the steering torque can easily be determined from the current applied to the steering motor.
It seems that everything is wired these days. As technology advances, more and more mechanical systems are being replaced by electronics. With respect to undercar systems, conventional shocks and struts have been replaced with electronic dampers. Coil springs have been replaced with computer-controlled air spring suspensions. Yet most of these changes to date have been limited to high-end luxury or performance vehicles. Cost is one reason. The other is reliability. Electronics can provide significant improvements in many areas of vehicle control, but only if the new systems are trouble-free and dependable, which has not always been the case.
Today, virtually all cars come with Anti-lock braking system (ABS) as standard equipment or as an option. The typical ABS system includes wheel-speed sensors, a hydraulic control unit, and an electronic control unit. When you apply the brake pedal, the electronic control unit monitors and compares the signals from the wheel-speed sensors. If the electronic control unit senses rapid deceleration (impending lock-up) at a given wheel, the electronic control unit commands the hydraulic control unit to reduce hydraulic pressure to that wheel.
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