ELECTRONIC STABILITY PROGRAM (ESP) 5 19.2 WORKING OF ESP During normal operating conditions the ESP controller will be monitoring the inputs made by the driver through the steering wheel brakes and accelerator pedals. It will also be monitoring the vehicles response to these inputs through wheel speed sensors and a yaw rate sensor. The driver inputs are used by the system to understand where and how the driver intends the vehicle to manoeuvre. Using the wheel speed and Yaw rate sensors the system calculates how the vehicle is actually manoeuvring, and by comparing the driver’s intentions with the actual vehicle response it determines if it has to intervene to maintain the vehicle on its intended path. The TCS part of ESP reacts to the vehicle spinning one or more of its driven wheels. When a wheel breaks traction and spins the drive force is lost. The driver cannot accelerate, and the vehicle stability is affected. The TCS is able to counter this via 2 control strategies; firstly it can brake the spinning wheel reducing the drive torque being delivered at that wheel. By preventing the drive torque from escaping at the spinning wheel more torque will be delivered to the wheel which is free to rotate. If all driven wheels are spinning or the level of torque being delivered to the wheels is so high it cannot be controlled by the brakes only the system will reduce the engine torque to a level that can be transmitted to the road. The ESP is a development beyond the TCS and reacts when it detects that the vehicle is starting to skid (under steering or over steering). ESP: Drive Modes MT Vehicle Drive Modes is an innovative feature associated can choose the vehicle dynamics as per driving Requirements for comfort, safe and sporty drive. This feature, which is associated with engine and seven Other systems in the vehicle, offers the optimum blend of performance, refinement, fuel economy and Excitement to the driver, Drive modes are selected through the Rotary Switch. The switch will have different drive modes namely Auto, Dynamic, Off Road and Comfort. A. Auto Mode: In Auto Mode system will adapt to the prevailing surface conditions automatically and enables control settings based on the condition sensed.This mode is designed to react more sensitively to support a regular driver to the available physical limit. Vehicle performance optimized to support all surface condition. B. Comfort Mode: In Comfort mode vehicle performance will be identical to Auto Mode i.e. system will adapt to the prevailing surface conditions automatically and enables control settings based on the conditions sensed. The Engine power output is reduced (320Nm) as compare to Auto Mode (400Nm), this mode is designed to cruise in more relax manner. C. Dynamic Mode: The intent is to offer a stable drift through dynamic mode selection for sporty driver. A sporty driver wants to have more body slip angle than a normal driver. Therefore the interventions by the Vehicle controller in dynamic mode is more focused to provide that extra freedom to test physical limit aggressively. D. Rough Road: Rough Road Mode optimizes the vehicle behavior for driving over rough road or other unyielding obstacles. Such condition causes wheels to be unloaded or to lift off the ground, causing a risk of them to spinning up. This mode is focused to improve grip and vehicle composure, predominantly when wheels may be up against steep obstacles and the vehicle is also going up on inclined surface or rough roads, torque optimization is specifically tuned for this condition. Braking performance is also tuned to support Rough road surfaces as compared to other drive modes, it also benefits in to better stopping distance and pedal feel for Rough Road surfaces. The EMS internal calibration and ABS/ESP operation modes change as per user selected drive modes as Described in Table below: Visual Indication of Drive Mode selection: The EMS and ABS/ESP will receive the switch status on CAN and after reaching the required drive mode, These ECUs will send drive mode state signal to the IPC, BCM and rotary switch to perform functions as Described below: 1. Instrument Panel Cluster and Infotainment system: will display the current drive mode 2. The rotary drive mode switch: It will give the appropriate function ON LED activation to indicate the Mode change.
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