Here's a breakdown:
* High-pressure: HDI engines utilize extremely high fuel pressure (up to 1800 bar) to inject fuel directly into the combustion chamber. This is in contrast to traditional diesel engines where fuel is injected into the intake manifold.
* Direct Injection: This means that the fuel is sprayed directly into the combustion chamber, rather than being mixed with air before entering the cylinders.
Benefits of HDI technology:
* Improved fuel economy: The precise injection and efficient combustion result in better fuel efficiency.
* Reduced emissions: HDI engines produce lower levels of harmful emissions, particularly nitrogen oxides (NOx).
* Increased power and torque: Direct injection allows for better fuel atomization and combustion, leading to more power and torque.
* Smoother running: HDI engines are known for their smooth and quiet operation, even at low revs.
Note: While HDI was originally a Peugeot and Citroën technology, the term is sometimes used more broadly to describe any diesel engine with high-pressure direct injection. However, it's essential to remember that other manufacturers may use different names for their similar technologies.
