How It Works

The principle of the GSPK Dual Fuel System is the substitution of low cost LPG for high cost Diesel Fuel thus reducing the overall cost of fuel used.

Modern HGV diesel engines are extremely efficient of the order of about 99.9% . The principle of substituting a cheaper fuel such as LPG is the logical method of reducing overall fuel costs.

GSPK’s sophisticated software and electronic control unit together with the GSPK designed gas valve both developed and manufactured in the UK, is the heart of the system that has been providing cost benefits to HGV operators for a number of years.

 Click here to view a larger version of the system diagram.

The ECU measures engine parameters such as rpm and load. It has an advanced Digital Signal Processor which produces a 3D map to determine the exact amount of LPG which should be added to the engine. The ECU then opens the gas valve to the precise position to inject the LPG gas under pressure into the engine manifold, where it mixes with the air.

The diesel engine draws the air/gas mix into the cylinder where it is compressed, and then the engine injects diesel which ignites, burning the LPG at the same time.

Because engine power increases the engine’s own electronics thinks that too much diesel is being injected and throttles it back. The total amount of fuel being consumed goes up slightly, and engine power goes up slightly, but because an amount of diesel is replaced by cheaper LPG the fuel costs come down.

Installation

Fitting is simple and can be carried out by one of our fully trained and dedicated Distributor / Installers either on their premises or on your own site.

The system is non-invasive to your engine or its controls.

First of all the ECU, the electronics which control the whole system is fitted (usually in the cab). The valve which controls the flow of LPG vapor and a reducer which converts liquid LPG into vapor are mounted in the engine bay. The LPG tanks are fitted within the chassis.

A small hole is drilled into the inlet manifold to inject the LPG. A knock sensor is also mounted on the engine block.

After that the electrical items are all connected together and the various LPG liquid and vapor hoses are connected, and the system is installed.

The beauty of this installation is just how little it interferes with the engine and how few modifications are made to the engine.