Tay lái trợ lực điện

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Nội dung Text: Tay lái trợ lực điện

Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering EPS (Electric Power Steering) – Motor drives the rack directly Resolver Type R l T Torque Sensors Steering Gear Unit • Burushless Motor Rotational Angle • Reduction Mechanism Sensor [Specifications] Type Vehicle Speed Sensing Type Gear R ti (O G Ratio (Overall) ll) ? No. of Turns Lock to Lock ? Rack Stroke [mm in.)] ?
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering System Diagram VGRS ECU BEAN (Instrument Panel Bus) Engine i J/C No. 2 J/C No. 1 Gateway ECU ECU Skid Control CAN PS Warning ECU Light EPS ECU P/S Temp. Sensor Torque DLC3 Boost Converter Sensors EPS Motor Battery (12V) Drive (28V) Rotation Angle g Sensor
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – Torque sensor detects the twist of torsion bar, changes it into the electric signal, and outputs it to EPS ECU Main Shaft (Input Shaft) Torsion Bar Resolver 1 to EPS ECU Resolver 2 l Pinion Shaft (Output Shaft) Rack Shaft
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – Torque sensor consists of resolver 1, 2 and torsion bar – Resolver 1 of rotor portion is fixed to main shaft, resolver 2 of rotor portion is fixed to pinion shaft. shaft Main Shaft (Input Torsion Shaft) Bar Resolver 1 (Stator Portion) Resolver 1 (Rotor Portion) Resolver 2 Pinion Shaft Resolver 2 (Stator (Rotor Portion) (R t P ti ) (Output Shaft) Portion)
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – Resolvers of rotor portion generate a relative angle difference of a twist of the torsion bar Main Shaft (Input Shaft) Resolver 1 (Rotor Portion) o o ) Resolver 2 (Rotor Portion) Pinion Shaft (Output Shaft) (O t t Sh ft)
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – Characteristic of resolver Exciting Detection 4 Coil Coil 1 2 1 3 3 4 2
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – Detection method of torque sensor Stator Portion Rotor Portion Stator Portion Signal A Signal B
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – Detection method of torque sensor Stator Portion Rotor Portion Stator Portion Signal A Signal B
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – Detection method of torque sensor Stator Portion Rotor Portion Stator Portion Signal A Signal B
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – One resolvor outputs two signals with which the phase lagged 90 degrees to detect a relative angle Output Resolver (Rotor Signal (V) Portion) Signal A i l t Signal B t AUTO Resolver (Stator MANUA Portion) P ti ) L
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – Resolver of rotor portion outputs the straight signal, when resolver of stator portion stayed Output Resolver (Rotor Signal (V) Portion) Signal A i l t Signal B t Resolver (Stator Portion) P ti )
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – When vehicle is driven straight, resolver 1 and 2 output the signals of the same signal [Resolver 1 Output Signal] [Resolver 2 Output Signal] t t t t
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – When steering is turned, relative angle difference is created between the resolver 1 and 2 of rotor portion [Resolver 1 Output Signal] [Resolver 2 Output Signal] t t t t
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Torque Sensor (Resolver Type) – EPS ECU decides assist voltage to a EPS motor from difference in relative position of resolver 1 and 2 θ θ1 θ = θ 1 - θ2 EPS ECU Assist Voltage θ2
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Motor (Brushless Type) – Motor is concentric with rack shaft, and consists of rotation angle sensor, stator and rotor Coil Rotation Stator Angle Sensor A l S Motor Magnet Rack Shaft Rotor
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Motor (Brushless Type) Coil Protrusion for Rotation Angle Sensor Stator Rack Shaft Rotor with Magnet g Rotation Angle Sensor S
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Reduction Mechanism – Movement of motor travels to ball screw reduction gear, via balls, to gear that is created on rack shaft Ball Screw Reduction Gear Ball Rack Shaft Rotor Ball screw reduction gear is fixed to rotor
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Reduction Mechanism – Ball is circulating the inside of the ball screw reduction gear by the ball director – Ball screw reduction gear has four ball directors Ball Director Ball Screw Reduction Gear Ball Director Ball B ll Ball Screw Reduction Gear Rack Shaft Rotor Ball screw reduction gear is fixed to rotor
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering Rotation Angle Sensor (Resolver Type) – Detects the rotation angle of the motor for preventing torque fluctuations Rotation Angle Sensor Output Signal (V) Signal A i l t Signal B t Rotor Rack Shaft Protrusion
Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering EPS Operation – Relationship between the steering torque and the assist power current output Low Assist Power Vehicle Current Output Speed High Steering Torque