ELECTRIC POWER STEERING: ELECTRIC POWER STEERING What is Electric power steering system?: What is Electric power steering system? Electrically powered steering uses an electric motor to drive either the power steering hydraulic pump or the steering linkage directly. The power steering function is therefore independent of engine speed, resulting in significant energy savings. Electric power steering system: Electric power steering system Hydraulic power steering system uses hydraulic pump which is run by electric motor. Whereas, in EPS system electric motor is directly attached to steering rack via gear mechanism (no pump or fluid). Electric Motor Location Types: Electric Motor Location Types COLUMN TYPE PINION TYPE RACK TYPE DOUBLE PINION TYPE EPS system consists of :-: EPS system consists of :- Torque sensor. ECU (Electronic Control Unit). Electric motor. Reduction Gear. Operational Mechanism Of EPS: Operational Mechanism Of EPS Classification of EPS: Classification of EPS The EPS system literally means that steering operation is entirely done by electronic / electrical means and no mechanical linkage exists between steering wheel and steered road wheels. Basically two formations are possible, they are, Using Steering Wheel Control Using Joystick Control Electronic Control System: Electronic Control System Sensors Position sensors Digital position sensors Speed sensors ECU (Electronic Control Unit) Actuators Power Supply Construction & Working: Construction & Working Construction & Working (Contd…..): Construction & Working (Contd…..) Comparison between EPS & HPS: Comparison between EPS & HPS Simple in Design Lighter in Weight Require less maintenance as hydraulic fluid is not used Gives better response at different speed Because of less problem & faults thus, it is durable than HPS More mileage ADVANTAGES: ADVANTAGES Increased Reliability Improved fuel economy As hydraulic fluid is not needed it is environment friendly Simplify design Using Joystick only one hand is sufficient to drive the vehicle. Self-diagnostic systems makes maintenance easy and cheap. APPLICATION: APPLICATION EPS can be incorporated into all passenger car and truck platforms. Since this system is compact and lightweight , it finds wide application in sports cars . Similar type of system is employed in India on Maruti-Suzuki Versa van, Zen VXI and Wagon R LXI etc . Electric power steering can be found on the Acura NSX (which was the first production car with this feature), the Honda S2000 , Toyota Prius and Toyota RAV4 , plus numerous GM models including 2004-2009 Chevrolet Malibu , 2005-2009 Chevrolet Cobalt & Equinox , 2006-2009 Chevrolet HHR , 2005-2009 Pontiac G6 (except the Convertible, GTP and 2007 GT models), 2006-2009 Pontiac Torrent , 2007-2009 Pontiac G5 , 2002-2009 Saturn VUE , and 2003-2008 Saturn ION . ANY QUESTIONS ?: ANY QUESTIONS ?