Brakes - Tcs/esp: Specifications Saab 9-3 II

Engine torque regulation

Engine torque regulation takes place after bus communication with the engine control module during which the ESP control module requests a specific engine torque from the engine management system. Engine torque is then regulated with ignition retardation and throttle control, i.e. changing the throttle angle and boost pressure (air mass/combustion). By using engine torque regulation, the brakes need not be applied as often, resulting in a higher degree of comfort.

This action means that kinetic energy in the drive wheels is converted to heat in both cases. Applying the brakes heats the wheel brakes and ignition retardation raises the exhaust temperature. In order to protect the turbocharger and catalytic converter, ignition retardation does not occur at high exhaust temperatures.

BTC (Brake Torque Compensation) (ESP B284)

This function provides a smoother and more comfortable engagement of ESP by adding more engine torque. This will reduce the driver's perception that ESP regulation is in progress. The ESP control module performs a summation of the braking forces on all wheels and requests a calculated torque to compensate for the retardation. This request is sent via the bus to the engine control unit that compensates with more air.

1. Calculation of braking force on all wheels
2. Speed
3. Torque request, max 25 Nm

Tightening torques

TIGHTENING TORQUES SPECIFICATIONS

Scheme 1

PULSE RATIO

Scheme 2

PULSE RATIO

See also:
• Crimp J345, main harness 5D