Power Steering Control Module

The power steering control module uses a combination of steering shaft torque sensor input, vehicle speed, calculated system temperature and steering tuning to determine the amount of steering assist. When the steering wheel is turned, the power steering control module uses signal voltage from the steering shaft torque sensor to detect the amount of torque and steering direction being applied to the steering column shaft and then command the proper amount of current to the power steering motor. The power steering control module receives a vehicle speed message from the powertrain control module via the serial data circuit. At low speeds more assist is provided for easy turning during parking maneuvers. At high speeds, less assist is provided for improved road feel and directional stability. The power steering control module nor the power steering motor are designed to handle 65 amps continuously. If the power steering system is exposed to excessive amounts of static steering conditions, the power steering control module will go into a protection mode to avoid thermal damage to the power steering components. In this mode the power steering control module will limit the amount of current commanded to the power steering motor which reduces system temperature and steering assist levels. The power steering control module must also be setup with the correct steering tuning which are different in relation to the vehicles powertrain configuration, sedan, coupe, tire and wheel size etc. The power steering control module has the ability to detect malfunctions within the power steering system. Any malfunction detected will cause the driver information center (DIC) to turn ON a warning indicator.