POWER STEERING SYSTEM


  1. OPERATION


    1. Power Steering Torque and Steering Direction Detection


      1. The torque detection circuit built into the power steering ECU assembly calculates the torque sensor 1 output (TRQ1) and the torque sensor 2 output (TRQ2) in accordance with the signals from the 2 detection coils of the torque sensor.

      2. The power steering ECU assembly detects the steering torque and the steering direction according to TRQ1 and TRQ2.

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        *1 Detection Coil
        *2 Torque Detection Circuit
        *3 Torque Sensor
        *4 Power Steering ECU Assembly

      3. When the driver does not turn the steering wheel, TRQ1 and TRQ2 output a specified voltage (approximately 2.5 V). As long as the specified voltage is output, the power steering ECU assembly determines that steering torque is not being generated.

      4. When the driver turns the steering wheel to the right or left, TRQ1 and TRQ2 changes as shown in the graph below. Based on the changes, the power steering ECU assembly determines the steering torque and steering direction input by the driver.

        Figure 1. TRQ1 and TRQ2 Output Characteristics

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