 | Gas Regulation Valves Gas Regulation Valve GRV Series Features GRV Series / Adopting Solenoid valve and Proportional valve... |
|---|---|
 | valve test bench(JWZ model for flanged.. valve test bench(JWZ model for flanged valves/hydraulic valve test bench/valve test) Place of.. |
And you can see more from
stainless stell valve
bronzeiron hose valve
vent check valve
food grade valve
best ball valves
water foot valve
brass tire valve
micro ball valve
2pcs ball valves
Boost control is the principle of controlling the boost level produced in the intake manifold of a turbocharged or supercharged engine by affecting the air pressure delivered to the pneumatic and mechanical wastegate actuator. Boost controllers can be as simple as a manual boost controller which can be easily fabricated oneself. One may also be included as part of the engine management computer in a factory turbocharged car, or an aftermarket electronic boost controller such as those made by Apex-i, Gizzmo Electronics or GReddy.
Contents
1 Principles of operation
2 Manual boost control
3 Electronic boost control
3.1 Control details
3.2 Advantages
3.3 Limitations and Disadvantages
3.4 Availability and Applications
4 Dangers in use
5 Past and Future
6 See also
7 External links
//
Principles of operation
Without a boost controller, air pressure is fed from the charge air (compressed side) of the turbocharger directly to the wastegate actuator via a vacuum hose. This air pressure can come from anywhere on the intake after the turbo, including after the throttle body, though that is less common. This air pressure pushes against the force of a spring located in the wastegate actuator to allow the wastegate to open and bypass exhaust gas from reaching the turbine wheel. In this simple configuration, the spring's springrate and preload determine how much boost pressure the system will achieve. Springs are classified by the boost pressure they typically achieve, such as a "7 psi spring" that will allow the turbocharger to reach equilibrium at approximately 7 psi.
One primary problem of this system is the wastegate will start to open well before the actual desired boost pressure is achieved. This negatively affects the threshold of boost onset and also increases turbocharger lag. For instance, a spring rated at 7 psi may allow the wastegate to begin to (but not fully) open at as little as 3.5 psi.
Achieving moderate boost levels consistently is also troublesome with this configuration. At partial throttle, full boost may still be reached, making the vehicle difficult to control with precision. Electronic systems can allow the throttle to control the level of boost, so that only at full throttle will maximum boost levels be achieved and intermediate levels of boost can be held consistently at partial throttle levels.
A simple manual boost controller. A small screw is located in the top of the aluminum body to adjust bleed rate. This model is placed in the engine bay, however the vacuum line could be extended to allow it to reach into the passenger compartment.
Manual boost control
A manual boost controller is a simple mechanical and pneumatic control to allow some pressure from the wastegate actuator to escape or bleed out to the atmosphere or back into the intake system. This can be as simple as a T-fitting on the boost control line near the actuator with a small bleeder screw. The screw can be turned out to varying degrees to allow air to bleed out of the system, relieving pressure on the wastegate actuator, thus increasing boost levels. These devices are popular due to their negligible cost compared to other devices that may offer the same power increase.
Additionally, another type of manual boost controllers use a ball and spring to control the amount of boost. This is installed with one vacuum line coming from the intake somewhere after the turbocharger, and one vacuum line going to the wastegate. A knob changes the force on the spring which in turn dictates how much pressure is on the ball. The tighter the spring, the more boost that is needed to unseat the ball, and allow the boost pressure to reach the wastegate actuator. There is a bleed hole on the boost controller after the ball, to allow the pressurized air that would be trapped between the wastegate actuator and the ball after it is seated again. These type of Manual boost controllers are becoming vastly popular since they don't provide a boost leak, allowing faster spool times and better control than a "bleed type" boost controller.
Generally a manual boost controller will not be accessible from inside the car, though some are designed to be. An installation that allows access from inside the car (as opposed from inside the engine compartment) is more complex, as the tubing must be longer and a hole must be drilled. It is possible and beneficial to use two manual boost controllers at different settings with a solenoid to switch between them for two different boost pressure settings. Some factory turbocharged cars have a switch to regulate boost pressure, such as a setting designed for fuel economy and a setting for performance.
Manual boost controllers do not solve partial throttle/full boost, drivability, and response or lag issues. They can be used in conjunction with some electronic...(and so on)
| Gas Regulation Valves Gas Regulation Valve GRV Series Features GRV Series / Adopting Solenoid valve and Proportional valve... |
|---|
You can also see some feature products :
all types valves
gas safety valve
cheap ball valve
upvc ball valves
dual tire valves
semi steel valve
solid gate valve
glove ball valve
pvc thread valve
monel ball valve
ss316 ball valve
flange gate vale
knife ball valve
ball ***** valve
cast forge valve
market cap value
4 solenoid valve
quick open valve
2 solenoid valve
mini float valve
hot blast valves
No comments:
Post a Comment