Duel-fuel systems for diesel engines
The DieselGas product is a unique engine management system by which specially designed and engineered mechanical and electronic components are fitted to a standard diesel engine to allow natural gas to be introduced to the engine in a “dual-fuel” configuration. The result of the conversion is that the engine will replace up to 80% of the diesel with no loss of performance. The DieselGas product is integrated with a sophisticated ECU (electronic control unit) and M2M (machine to machine) software to enable responsive real time remote engine management and remote monitoring. DieselGas works closely with the engine manufacturer in the design and development process to ensure that all performance parameters are consistently observed, and the company has achieved ISO 9001:2000 certification and has achieved certified supplier status with such manufacturers as Robert Bosch and Caterpillar and has met EPA and Euro emissions standards in every country where these have been a requirement. DieseGas’s dual-fuel technology works equally well with CNG or LNG
DieselGas dual-fuel systems are designed for heavy duty diesel engine for truck, buses and industrial applications. 30 years of development has resulted in a mature and stable design with multiple feature which allows diesel engine like performance and integrity.
The economics dictate that larger heavily loaded engines have higher diesel use and therefore can achieve higher fuel cost savings giving faster returns on investment when converted to operate using DieselGas dual-fuel systems. DieselGas target market is 400hp to 600hp truck engines such as those used in Class 8 trucks in the US.
Base load diesel generators also have excellent return on investment because of their high fuel consumption from long operating hours at high load. The same applies to industrial and marine engines.
Smaller engine classes can be converted using DieselGas dual-fuel systems with excellent technical performance but the return on investment is reduced as the total diesel consumption is less.
Diesel engines have either mechanical or electronic diesel injection systems which affects the dual-fuel system design. Older engines use mechanical diesel injection systems (mechanical dual-fuel systems) and current engines, which are designed to meet more stringent emissions standards, use electronically controlled diesel injection systems such as unit injector or common rail types (electronic dual-fuel systems).
Electronic dual-fuel systems
On dual-fuel systems for diesel engines with electronic diesel injection systems the DieselGas ECU interfaces with the diesel engine’s electronic sensors and OEM ECU but the OEM ECU is not modified. Pilot diesel delivery for dual-fuel operation is controlled by modifying the diesel delivery signal to the diesel injector solenoid.
The DieselGas proprietary high pressure single point natural gas injection system delivers the natural gas into the inlet air between the aftercooler and the inlet manifold. The inlet air to fuel ratio is controlled by a throttle plate prior to the natural gas injector.
Many of the diesel engine sensor outputs are used as inputs to the dual-fuel system such as engine speed, phase, demand, coolant temperature and exhaust after treatment controls and new sensors are added to measure combustion knock, exhaust oxygen, inlet manifold air temperature and pressure and natural gas temperature and pressure.
An interactive drivers display communicates with the driver to show natural gas storage, diesel substitution and to indicate any special service requirements. Technicians may use the display to access fault codes and other technical data.
Data logs can be downloaded from the DieselGas ECU with a laptop computer either at the vehicle or remotely using GSM networks.
Mechanical dual-fuel systems
DieselGas dual-fuel systems for engines with mechanical injection systems differ from those for electronic systems only in the diesel control design which uses a mechanical interface with the diesel injector pump.