Benefits of Emulation of the fuel injector signals

The function of the engine ECU is to control the engine. The most demanding part of which is the generation of the fuel control signals. These must be generated in real time to a high degree of accuracy. The fuel control signals are generated as the output from a closed loop control system the primary input to which is throttle pedal demand.

Fuelling is normally controlled solely by the engine ECU with fuel control signals supplied only to the fuel injectors. Therefore, there is no requirement for the ECU to either broadcast these signals or to accept external inputs to modify them. Even if such features were added to the engine ECU software and the CAN message catalogue, the latency associated with external communications or other general purpose inputs or outputs would be too great to provide fuel injector control with the required accuracy and timing.

G-volution’s Optimiser uses the patented robust principle of Emulation - amending the signals sent by the original engine ECU to the injectors in order to reduce the diesel dosed into the engine. This is a more robust technique to disturbing engine inputs via false sensor signal changes or CAN messaging amendments to achieve a diesel dose reduction.

 

Operating in this mode provides a number of significant benefits:

 

1) The original engine ECU remains the master for the engine control loop.

 

2) The Optimiser acts as a slave unit, translating the primary fuel control signals and managing the alternative fuel system.

 

3) The Optimiser is effectively transparent to the engine ECU and thus the original engine ECU continues to operate normally.

 

4) The original engine power and torque characteristics are maintained because the engine is running on the original maps under the control of the original ECU at all times. It is only the ratio of fuels used that is changed by the Optimiser.

 

5) The Optimiser and alternative fuel system is calibrated to ensure that there is effectively no difference in the performance or response of the engine.

 

6) Since, the Optimiser operates on the primary fuel control signals, it is inside the control system feedback loop. Therefore it works in sympathy with the control loop, rather than against it. For example changing the throttle pedal demand or altering the fuel rail pressure to reduce the primary fuelling would perturb the control loop and potentially introduce instability or force it to a new operating point.

 

7) The fact that the Optimiser works in real time inside the control loop, means that it can operate effectively all of the time. Therefore there are no conditions which prevent operation on multiple fuels (including during gear changes and high transient operation).

 

8) Since the original OEM ECU retains control of the engine, all of the emission control strategies remain unaffected. The start of injection / injection timing is not affected by the Optimiser, nor is the control of EGR or SCR systems.

 

9) The Optimiser does however provide the capability to change the ratio of the multiple fuels in real time dependent on the operation conditions of the engine. 

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