GM > Engine > Torque Management > Supercharger

Supercharger Torque Management
The values affect Supercharger Torque Management on supercharged V6 engines and L4 engines (eg. Cobalt SS and Saturn Ion 2.0L)

SC3800 V6 Engines

• TCS Mode Threshold: When TCS is active and TCS Mode exceeds this threshold, the VCM will calculate a maximum allowed supercharger boost.
• Enable Speed: If in 3rd gear and above this speed, the Supercharger Torque Management Timer will begin
• Enable Time (secs): If Supercharger Torque Management Timer expires torque is reduced. (ie. 3rd gear, speed above Enable Speed for Enable Time seconds)
• Torque Reduction Mult: Allowed maximum torque is multiplied by this value when enabled.

L4 "LSJ" Engine and other later vehicles

General

• Supercharger: Indicates if a supercharger is fitted to the vehicle.
• Boost Inhibit: If enabled, boost will be permanently inhibited.

Supercharger Torque

• Supercharger: Indicates if a supercharger is fitted to the vehicle.
• Boost Limit - Spark: If enabled, PCM will use spark to control boost.
• Boost Limit - Fuel Cut: If enabled, PCM will use fuel cut to control boost.
• Boost Limit - ETC: If enabled, PCM will use ETC(Electronic Throttle Control) to control boost.

Intercooler

• Intercooler: Indicates if an intercooler pump is fitted to the vehicle.
• Intercooler ERT Min: Minimum engine run time to enable intercooler pump.
• Intercooler IAT Min: Minimum intake air temperature to enable intercooler pump.
• Intercooler Pump IAT Min(Gen 4 PCM): Below this IAT the intercooler pump will be disabled.
• Intercooler Pump MAT Min: Below this MAT(IAT2) the intercooler pump will be disabled.

Boost Limits

• ETC Boost Limit: Maximum boost percentage when ETC power management is active.
• TCS Boost Limit: Maximum boost percentage when traction control is active.
• Reduce IAT: If IAT exceeds this value IAT Boost Limit will be active.
• Full IAT: If IAT Boost Limit is active then IAT must drop below this value to enable full boost again.
• IAT Boost Limit: Maximum boost percentage when IAT Boost Limit is active.
• Supercharger Boost Reduce ECT: If ECT is below this value then ECT Max Boost is used.
• Supercharger Full Boost Enable ECT: If active, ECT must move above this value to disable the ECT Max Boost Limit.
• Supercharger ECT Max Boost %: Maximum Boost % when ECT thresholds are met.
• Supercharger Cam Min Angle: Minimum camshaft angle for Cam Phaser boost limit.
• Supercharger Cam Min TPS: Minimum throttle for Cam Phaser boost limit.
• Supercharger Cam Max Boost %: Maximum Boost % for Cam Phaser boost limit.
• Supercharger COT Max Boost %: Maximum Boost % when COT EQ threshold is exceeded.
• COT Limit Eq Ratio: If COT Equivalence ratio exceeds this value then COT Boost Limit will be active.
• COT Boost Limit: Maximum boost percentage when COT Boost Limit is active.
• Knock Boost Limit: Maximum boost percentage in relation to the Knock Learn factor (Octane Scalar). Reduces boost if excessive long term knock detected.
• 1st Gear Boost Limit: Maximum boost percentage when in first gear in relation to RPM.
• 2nd Gear Boost Limit: Maximum boost percentage when in all gears (except 1st) in relation to RPM.

Boost Disable

• Supercharger MAP Disable: Above this MAP boost control will be disabled.
• Supercharger MAP Enable: MAP must be below this to enable boost control.
• VSS Min: Boost will be disabled if VSS is larger than this value and TPS below the threshold.
• TPS Max: Boost will be disabled if VSS is larger than threshold and TPS below this value.
• Boost Ramp: Boost will ramp in at this rate after being cut. Lower numbers mean a slower ramp in.

Boost Control

• Supercharger Boost Base DC: Base boost solenoid duty cycle in relation to RPM and Pressure.
• Proportional Gain: Proportional gain for supercharger boost control, larger numbers mean faster response but increased risk of instability and oscillation.
• Integral Gain: Integral gain for supercharger boost control, larger numbers mean faster response but increased risk of instability and oscillation.
• Desired MAP: The desired MAP for controlling boost, this is the target value the boost control tries to achieve.
• Desired MAP Steady State (S/S): The desired MAP for controlling boost, this is the target value the boost control tries to achieve when in steady state. This reduces boost when in steady state cruising. See steady state parameters below.
• Supercharger Desired Torque vs. RPM: Desired Torque in relation to RPM when not in steady state.

Steady State Reduce

• Enable Accel Max: Steady state timer update will be allowed when engine acceleration rate is below this.
• Enable Accel Min: Steady state timer update will be allowed when engine acceleration rate is above this.
• Disable Accel Max: Steady state timer will be reset when engine acceleration rate is above this. High acceleration.
• Disable Accel Min: Steady state timer will be reset when engine acceleration rate is below this. High deceleration.
• Timer Increment RPM: Above this RPM the steady state timer will increment if acceleration is within limits.
• Timer Hold RPM: Below this RPM the steady state timer will reset.
• Timer Hold TPS: If RPM is above the hold RPM and TPS is below this limit then the steady state timer will reset.
• Enable Time: If the steady state timer exceeds this value then the steady state boost control will be used.
• Torque Reduction Mult: Multiplier that reduces the the maximum allowed torque when steady state is enabled.
• Supercharger Max Torque Gear VSS: Minimum vehicle speed to enable Supercharger Max Torque Gear Table.
• Supercharger Max Torque Gear Max: Maximum allowed gear to enable Supercharger Max Torque Gear Limit.
• Supercharger Max Torque Gear Min: Minimum allowed gear to enable Supercharger Max Torque Gear Limit.
• Supercharger Max Torque Gear Delay: Time that Gear and VSS limits must be met to enable Supercharger Gear Torque Mult table.
• Supercharger Max Torque/MAP Gear Mult: Multiplies maximum torque or pressure when boost reduction is requested due to vehicle speed and gear for extended cruising.

Knock Reduce

• Supercharger Max Torque/MAP Knock Mult: Multiplies maximum torque or pressure when boost reduction is requested due to knock.

Torque Method