Partial ignition is actually a special adjustment for the fuel supply and ignition of the turbocharged engine for a faster start acceleration. Partial ignition is basically an engine setting method derived from linear acceleration racing. Since this is a deliberate explosion of the mixture outside the combustion chamber, partial ignition is actually equivalent to the so-called [Missfiring]. Next, the editor will explain what is the principle of the lower-side ignition system and what are the advantages and disadvantages of partial-time ignition system.
What is the principle of partial ignition system
The technical principle of the partial-time ignition system: When the partial-time ignition system is in use, it will make a "bump... bump..." noise, and a blazing flame will also appear behind the exhaust pipe, making people boil. It originated from the WRC race at the earliest. The car equipped with this system can play a powerful acceleration force at the fastest speed while exiting the corner after decelerating into the corner in a very tricky continuous curve. If the off-time ignition system is It's not an exaggeration to live in a corner.
The existence of the partial-time ignition system is to eliminate turbo lag. The principle of the partial-time ignition system is very simple. In the case of loose throttles such as turning or deceleration, the ECU will order the car's fuel supply system to inject a large amount of gasoline into the engine, but it will not Ignition, directly let these foggy gasoline pass through the engine without combustion into the extremely high temperature (about 800 to 900 degrees Celsius) exhaust system.
Use the generated pressure to push the turbine blades to continue to accelerate, so that the car can maintain the speed of the turbine blades (about 14000-20000r/min) even under deceleration, thereby eliminating the phenomenon of turbo lag and allowing the car to have a turbocharged Horsepower also has a smooth natural inhalation. Moreover, the powerful explosion flame will also rush along the exhaust pipe all the way to the tail pipe, so when the ignition system is operating at a bias, sparks will be emitted from the exhaust pipe!
What are the advantages and disadvantages of partial-time ignition system
The partial-time ignition system not only reduces the turbo lag of the supercharger, but also has another advantage, that is, gasoline itself has high volatility, can absorb part of the heat of the engine, and can be effective when the highly volatile gasoline enters the engine and exhaust system Reduce the temperature of the engine. Therefore, a turbocharged racing car needs to burn a very rich mixture of gases. Although it causes high fuel consumption, it can reduce the high temperature of the engine. From this perspective, it can increase the durability of the engine.
But in contrast, shortcomings are inevitable. The strong power and high temperature generated by the high-concentration mixed gas when the exhaust system explodes will increase the load on the exhaust head section, turbine exhaust end blades and valve surroundings, etc., and shorten the turbine, exhaust system and engine exhaust valve Service life.
Although these weaknesses can be alleviated by the coordination of various parameters, they are still inevitable. In addition, the partial-time ignition system will greatly reduce the engine braking effect, because the crankshaft and piston are in the state of inertia rotation without ignition and external force, which is like stepping on the brake in neutral, the engine cannot provide sufficient braking force, so the vehicle When entering a corner, you must fully rely on the brake system to bear the burden. The setting of the brake system cannot be ignored for vehicles equipped with ALS.
On the whole, the damage caused by the partial-time ignition system to the machinery is still more harmful than good. In addition to being used in racing cars that are competing every second, generally modified cars are still not suitable for modification.