Traditional Culture Encyclopedia - The 24 Solar Terms - The fuel consumption of the turbine car is 0 when it goes downhill. Is the turbine working at this time?
The fuel consumption of the turbine car is 0 when it goes downhill. Is the turbine working at this time?
When the turbocharged vehicle breaks down, the turbocharged system becomes a follow-up device, which still runs, but it has no practical effect; Measuring the actual state of the turbine; The turbine is still rotating, but the pressure in the intake manifold is negative at this time, so the turbine system is useless at this time and has no boosting effect.
The rotation of the turbine and the positive pressure of the turbine are completely different, so it is difficult to describe the actual state of the turbine with the word whether the turbine works or not. The turbine in the turbocharger is driven by the exhaust gas from the engine. Its working speed can reach 200,000 revolutions.
When the turbine rotates at a high speed, another coaxial turbine rotates to compress air at the same time, thus achieving the effect of supercharging. It is inevitable that the throttle will close, slip, brake suddenly and shift gears during driving. , the throttle opening will be reduced or even closed. At this time, the turbine will still run at high speed under the action of inertia.
However, due to the closing of the throttle, the air pressure between the turbocharger and the throttle is too high, which makes the turbine resistance increase rapidly. When the intake pressure sensor detects that the pressure is too high, the air bypass valve opens to discharge the high-pressure gas at the intake side of the turbocharger, thus realizing decompression protection.
As long as the fuel injector of the engine is working, the vehicle will consume fuel, but the vehicle with the function of slowing down and cutting off the fuel can control the fuel injector of the engine to stop working when it can slow down and cut off the fuel, that is, when the fuel consumption is zero and the throttle is closed, the turbocharger is working, because the turbocharger impeller cannot stop working immediately.
Impeller is also a turbofan. The turbocharger has an exhaust bypass valve, an intake bypass valve, a valve and a pressure reducing valve. When the rotational speed is too low, the turbocharger does not work, because the exhaust volume is insufficient and the rotational speed is low, which can not provide the necessary boosting pressure. Therefore, when the rotational speed is low, the bypass valve of the supercharger opens and the exhaust gas flows out from the bypass valve.
But the bypass valve is next to the turbine blades, so the exhaust gas will definitely cause the turbine to rotate slightly, but this rotation has no effect on the operation of the engine. The turbine doesn't work all the time, because when it doesn't need much power, it will actually waste a lot of energy if it works all the time.
So you give a little throttle, the speed is around 1800, and the turbine does not participate in the work. Suppose you work, at this time you need to give a certain amount of energy to pressurize the air, and the energy output is quite large, which is a bit wasteful.
Exhaust gas turbines are generally used, depending on the amount of exhaust gas emitted by the engine at that time.
Whether the turbine is involved or not depends on the calculation and judgment of the return data by the driving computer through the relevant detection and sensing equipment in the car. Therefore, the turbine does not intervene in the state of downward oil collection, the engine speed is low, and the exhaust emission is too low to drive the turbine. Of course, things like mechanical supercharging and electronic turbocharging are another matter.
They all have the same feature, that is, they are very expensive. Another question is whether the instantaneous fuel consumption indicates that the engine is injecting fuel at zero time. According to the actual situation, different cars and different working conditions are different. When stepping on the accelerator, the fuel injection quantity is not directly controlled, but by controlling the opening and closing of the throttle valve, and then the driving computer controls the fuel injection quantity according to the working environment.
Under normal circumstances, the engine will not inject fuel when the throttle is turned off after acceleration. Of course, it's not perfect. Even if the car is in a downward state, the turbine is still rotating and working (in fact, the turbine is very busy), but working does not mean that it has a role. The test of whether the turbine works is not whether it can rotate, but whether it can provide positive pressure to the intake manifold.
The negative pressure of the manifold and turbine is useless, so the turbine is busy, but it is busy, rotating, in vain; Therefore, when the car breaks down and accumulates gasoline, the turbocharger will work and still run, but it has no practical effect.
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