Cam for lifting/lowering exhaust valve, 4-cycle engine equipped with supercharger, and method for controlling valve timing
A four-stroke engine and valve timing technology, applied in engine control, machine/engine, electrical control, etc., can solve problems such as program complexity, increased calculation burden, and cost disadvantages
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no. 1 approach
[0063] figure 1 It is a schematic diagram showing a four-stroke engine with a supercharger according to the present invention. The four-stroke engine in this embodiment is assumed to be a diesel engine. Furthermore, the intake side of the exhaust device 1 of the engine of the present embodiment is provided with: a comb-shaped intake-side first pipe K1 into which the intake air sucked into each of the six cylinders flows; 2 compressor 21 and a central portion of the intake-side first piping K1 connected to one intake-side second piping K2. The intake manifold KM is constituted by the intake-side first pipe K1 and the intake-side second pipe K2.
[0064]In addition, the exhaust side of the four-stroke engine is equipped with: a comb-shaped exhaust-side first pipe H1 into which exhaust gas discharged from each of the six cylinders flows; One exhaust-side second pipe H2 connected to the turbine 22 of the turbocharger 2 . The exhaust manifold HM is constituted by the exhaust-s...
no. 2 approach
[0090] Figure 5 It is a valve timing diagram showing a second embodiment of a four-stroke engine with a supercharger applied to the present invention. In this second embodiment, the same components as those in the first embodiment are given the same reference numerals, and description thereof will be omitted.
[0091] In this second embodiment, as in the first embodiment, the exhaust valve pressing cam 4 for one cylinder has a function of avoiding the contact between the exhaust valve 3B and the piston and increasing the overlap of the exhaust valve 3B of the other cylinder. An exhaust main lift portion 4a for exhausting exhaust gas from a cylinder raised from the base circle R in a quantitative manner; and a return lift portion 4b for increasing the amount of return exhaust gas to the exhaust port of another cylinder.
[0092] Furthermore, in the second embodiment, while the exhaust pressure of other cylinders is higher than the intake pressure of one cylinder, the intake v...
no. 3 approach
[0096] Image 6 The relationship between the crankshaft angle and the valve lift amount of the third embodiment of the four-stroke engine with a supercharger according to the present invention is shown. Figure 7 The shape of the cam used for this 3rd embodiment is shown. In this third embodiment, the same reference numerals are attached to the same components as those in the first embodiment, and description thereof will be omitted.
[0097] Image 6 In the graph shown by the solid line, the graph of the valve lift amount in the prior art shown by the dotted line is divided into two regions, the area L1 and the area L2. In the area L2, the exhaust valve rises at a constant speed. A graph of changes in the way they start.
[0098] Such as Figure 7 As shown, the return lift portion 4b of the exhaust valve pressing cam 4 corresponds to the constant velocity lift portion 4b2 where the exhaust valve 3B lifts up at a constant velocity. When the relationship between the cranks...
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