Ever since cables first connected accelerator pedal to carburetors, drivers have been searching for better throttle response - the connection between input at the pedal and power delivered to the wheels. Electronically controlled throttle offers an interesting solution and may even change what we consider the throttle’s job to be. There are two important maps for the driver: the Driver Pedal Map and the Driver Torque Demand Map.
1. The engine torque map engine torque map is a theoretical model of the engine. It represents the torque delivered by the engine as a function of engine speed and engine throttle position. In the ECU the engine torque map is used to position the engine throttles to match the drivers’ torque demand. This is a 2-dimension table with engine speed and throttle as inputs and torque as output. This map is defined point-by-point or by ramps at the test rig with the fired engine and the torque meter.
2. The inverse engine torque map . It is calculated by the engine torque map. It is a 2-dimensions table with torque and engine speed as inputs and throttle as output. It is computer calculated.
5. Ignition map . The key thing when tuning an engine in terms of controlling fuel detonation. Determine proper way of fuelling, air-fuel Ratio (AFR), exhaust gas temperature and ignition position.
This 2-dimension table map is defined point-by-point or by ramps at the test rig with the fired engine and the torque meter. Sometimes is trimmed on track if the car is equipped with torque meters on the transmission.
“The torque map doesn’t change much over the course of a weekend, or between races. Under the new technical directive, issued between the German and Hungarian Grand Prix, you can’t really change the maps that much over a weekend or between races. It’s like a fingerprint of the engine. There will be subtle differences between the teams due their respective air boxes and exhausts, which will slightly change the form of the map. Prior to this directive, we would change the torque map freely to suit the climatic conditions. For example, the engines will produce nearly 10% less torque at Sao Paulo than they will this weekend in Korea due to Sao Paulo’s high altitude. By changing the torque map to the prevailing conditions the engine response will feel the same to the driver across the season. Nowadays we have to request this torque map change from the FIA, and fully justify our reasoning.”
5.5.4 The accelerator pedal shaping map in the ECU may only be linked to the type of the tyres fitted
5.5.7 Homologated sensors must be fitted which measure the torque generated at the power unit output shaft and the torques supplied to each driveshaft. These signals must be provided to the FIA data logger.
There are, of course, limitations that have been placed upon pedal maps so that a version of traction control doesn’t edge its way back into the sport and the FIA is quite strict on how teams use pedal maps, especially on launch procedure. But during the Fridays teams are working incredibly hard to make sure that they hone pedal maps for each corner and for each driver to make sure that they are happy with throttle application and power output.
5.5.1 The only means by which the driver may control acceleration torque to the driven wheels is via a single chassis mounted foot (accelerator) pedal.
5.5.2 Designs which allow specific points along the accelerator pedal travel range to be identified by the driver or assist him to hold a position are not permitted.
- Except for some specific exceptions, the engine torque must be controlled by the driver. These exceptions include: downshifts, pit lane speed limiter, anti-stall function and the end of straight limiter strategy. Note that this list is not exhaustive.