Denso Corporation has jointly developed with Toyota Motor Corporation what is claimed to be the world’s first 1,800-bar diesel common rail system with newly developed piezo injectors for the European Toyota Avensis.
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“A key challenge with diesel engines is reducing NOx, PM and other harmful substances in the exhaust gas, which is something we have to do to meet increasingly rigorous regulations,” said a Denso spokesman.
The new system achieves the world’s highest fuel injection pressure, performing up to five high-accuracy injections during each combustion stroke. It uses highly responsive piezo injectors to attain a shorter injection duration and realize a finer fuel atomization spray, resulting in improved combustion performance.
As a result the system generates more engine power and reduces harmful emissions, such as nitrogen oxide (NOx) and particulate matter (PM). Compared to a solenoid injector, this piezo injector, reduces the minimum injection interval from 0.4 milliseconds to 0.1 millisecond, the shortest interval in the world.
Denso also supplies a filter (cordierite DPF material) and an exhaust fuel addition injector that injects fuel into the exhaust pipe to burn PM collected in the filter. Both products are installed in the DPNR (Diesel Particulate NOx Reduction) system, which purifies exhaust gas.
