1
What is?
closing cylinder engine technology is that the engine may be shut down the engine under certain circumstances part of the cylinder.
2
what’s the use?
power required in normal engine operation is large vehicle acceleration and high speed, while in the low-speed, constant speed required power is small in the closed part of the cylinders of the engine, improved fuel economy of the vehicle . And in effect serve to reduce emissions without reducing engine capacity to deal with the increasingly stringent emissions policy.
3
The main types of
* for a particular cylinder cut-off of oil, but does not stop the intake . Stop fuel injection, but the intake valve is still working properly, but can not solve the “pumping losses”, both under vacuum piston downward movement was resistance to crankcase pressure, consuming problems do functional capacity has been phased out.
* for a particular cylinder shutoff valve and stops its movement. Currently the most widely used technology, which effectively solve the “pumping losses” problem closing cylinders during low engine load. However, this technique also has some drawbacks, for example, will lead to uneven distribution of thermal deformation of the cylinder. It requires the use of auxiliary temperature control technologyTo control the temperature of the engine block or cylinder controlled closing time.
– stop the oil base and the stop gas on the exhaust gas and then introduced into the cylinder to stop the cylinder, in order to maintain the thermal balance. Theoretically optimal solution close cylinder engine technology, but the technical difficulty. It is still in the research and development stage.
4
Further reading
General Tripower variable valve management
[ 123] is mainly controlled by the state of the engine camshaft in three different lift cams. Three kinds of lift of the intake valve corresponding to three different states, the high lift of the intake valve, the intake maximum efficiency, the focus of the engine power output. Low intake valve lift, intake efficiency balance, pay attention to the fuel economy of the engine. Intake valves been closed, no longer corresponds to the cylinder injection ignition operation proceeds to the closed state of the cylinder.
Mass ACT art adjustable cylinder
Further improvement achieved by moving the camshaft about closing cylinder cam be achieved. After transformation of the high and low two kinds of cam angle, to select a low angle operation with high operating angle or by controlling the electromagnetic valve when the camshaft at a low angle can not reach the state of the valve, so ECU is not carried into the cylinder injection. Honda VCM technical principle is the rocker link of the control valve controlling hydraulic pressure passage communicating the plunger cylinder deactivation work implement is disconnected, this block variable engine control system may be implemented in a high engine rotation when force hearty, in low-speed or congested road can do low-emission vehicles low-emission, low fuel consumption.