SEQUENT is the right solution for last generation vehicles (Euro 3 and Euro 4) because represents the most advanced level of evolution for what concerns the equipment of gas injection, and it can be defined to all intents and purposes as a “COMMON RAIL” system.
In fact it first introduces, in the gas propelled field, the winning evolution used for modern Diesel engines: a “rail-line” in pressure (rail) that supplies fuel to all injectors (true injectors) that are assigned to inject it in each cylinder of the engine.
In the SEQUENT system, unlike an injection at continuos flow (stream), the ECU calculates the opening times of the injectors, cylinder per cylinder, and it acts them separately on each gas injector with the highest precision and with the best timing if compared with the opening instant of the intake valve. The sequential injection control allows consequently obtaining the top timeliness and precision of the fuel dosage.
As per all electronic injection systems, a mixer does not aspirate the gaseous fuel, but the correct quantity is determined through the calculations made by the ECU. It allows obtaining the well known advantages of the injection systems, such as:

• No disadvantages in the performances on petrol, caused by the absence of a mixer,
• Maximum performances on gas, typical of the injection systems,
• No additional overall dimensions on the intake pipes,
• Elimination of the backfire risks, due to the injection near the intake valves and increased by the fact that injection is in a timed way with the opening of the intake valve.
  

The result is that the original sequential injection operation of the vehicle, the engine had been studied, built and optimised for, is absolutely unchanged, with the following practical results:

• Better driving fluidity,
• Consumption optimisation,
• Reduction of polluting exhaust emissions.

Other advantages are the following:

• It is normally not necessary to delete the error codes in the petrol ECU, because they do not appear anymore,
• it is not necessary anymore to install the “Memory” devices on those vehicles provided by OBD diagnosis,
• all the petrol ECU functions remain perfectly efficient even while running on gas, assuring the respect of the OBD regulations,
• each injector is piloted singularly, giving the possibility to maintain the petrol injection ecu strategies while running on gas,
• no particular adjustment is needed, if the configuration is available.
• BRC injector