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| What is HDi and how does it work? | HDi is high pressure direct injection. Diesel fuel is injected directly into the combustion chamber(a well in the piston crown) | |
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High pressure common rail |
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diesel fuel is pumped at pressure into a storage rail. |
pressurized fuel is available to each injector even at low revs | |
| electronic control thru' ECU means injection timing, and the quantity of fuel injected can be very precisely controlled |
Quantity injected and |
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| 2 stage injection - each injection 'event' h a pilot injection followed by a main injection | ||
| The ECU Receives information about: |
engine temperature |
| The ECU Sends commands to: |
injectors |
Peugeot diesels engines are regarded the finest the world over. Reliable and efficient and hardworking Peugeot lead the field in rotary diesel engines and evolved the common rail diesel early in the 1990's
better
fuel economy
lower exhaust emissions
Quieter, smoother peformance.
Schematic of HDi fuel setup
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| 1 | high pressure fuel pump |
| 2 | fuel pressure sensor |
| 3 | common fuel rail |
| 4 | fuel pressure regulator |
| 5 | electronic injectors |
| 6 | fuel pump - tank to engine |
| 7 | fuel tank |
| 8 | Electronic control unit ECU |
| 9 - 14 |
sensors - position, temperature, pressure, |
Under the bonnet - beneath the hood
| Power Acceleration Economy | With the HDi Peugeot set out to maximize power output and acceleration along with increed fuel economy. |
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Reduced friction and inertia |
roller-and-pawl valve driving system - less friction pistons, con-rods and engine valves - lighter weight |
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Common Rail Advantages |
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| Common rail means high pressure even when the engine is running slowly | engine can develop high torque at low revs allowing for smooth rapid acceleration across the power band |
| Less noise, less vibrations | 2 stage injection reduces 'rattle' typical of direct injection diesel |
| Improved Economy | fuel saving of 20% c/w rotary diesel |
| Wider service interval | 20,000 km (15,000 before) |
| Synthetic engine oil | improved piston design |
| Particulate filter | |
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Problems with fuel, engine or injectors? Problems with EOBD and electrical
faults Make money
buying and selling car spares at |
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