A society in which environmental impacts of
vehicles are close to zero

To realize a sustainable automotive society, DENSO is contributing to the prevention of global warming and resource depletion, and the reduction of environmentally hazardous substances through its unique technologies and skills.

Common rail system

Reduced particulate emissions plus reduced nitrogen oxide result from 'world first' diesel engine technology

Diesel engines offer lower CO2 emissions than gasoline engines.
The common rail system has reduced particulate matter (PM) and nitrogen oxide (NOx) emissions which are disadvantages of diesel engines.

Fuel which is atomized under high pressure injection in common rail systems burns more effectively, thus producing less PM. Conventional single injection causes a rapid increase in combustion temperature and the production of NOx. In contrast, the common rail system allows the multiple injection of a small quantity of fuel to limit the temperature rise and reduce NOx emissions.

DENSO, the first manufacturer in the world to mass-produce common rail systems in 1995, enabled its systems to operate at 180 MPa (1,800 bar), in 2002, and will introduce 200 MPa (2,000 bar) system in 2008.
As a total diesel engine management system supplier ranging from air intake products to exhaust after treatment product including DPF substrates, DENSO will continue to assist the development of ideal diesel engines.

Hybrid vehicle components

Hybrid vehicles' superior performance through state-of-the-art technologies

With sophisticated control systems that combine the engine and motors, hybrid vehicles successfully reduce CO2 emissions and yet deliver powerful acceleration.

To support complex hybrid vehicle systems, DENSO provides state-of-the-art products including control technologies for the vehicle engine, one of the company's fields of expertise, and traction inverters-key components for electric motor control technologies and energy regeneration-and battery monitoring units in the area of power electronics.

Traction inverters are critical to the control of electric motors. DENSO provides the world's top power density (output power per unit volume) inverters (as of July 2007) for the Toyota Lexus LS 600h, with a new cooling technology that limits the temperature rise of the built-in semiconductor power devices. This cooling technology is based on both radiator, and electronics technologies which have been developed through the in-house production of semiconductor devices.

Electric VCT system

Expanded VCT operation area allows more improvement of engine output, fuel efficiency and exhaust emissions.

The variable cam timing (VCT) system, which controls the timing of intake and exhaust valves of the engine, has been widely used for automobiles in recent years.

Conventional hydraulic VCT systems are actuated by engine oil pressure, and so operation of their mechanisms is limited by low engine oil pressure at engine cranking or low engine speeds or by high engine oil viscosity at low engine temperatures. DENSO's electric VCT system, however, flexibly controls valve timing even under such adverse conditions, thus raising engine output and environmental performance.

DENSO's position as the global leader in the development and manufacture of VCT systems, based on its precision machining technologies, small motors, and motor control technologies, has enabled the practical application of this new electric VCT technology.