Method for operating engine in intermittent combustion mode and engine control device
A technology of combustion mode and control device, applied in the direction of engine control, machine/engine, electrical control, etc., can solve the problems of vibration and noise that interfere with the low frequency of occupants
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no. 1 example
[0019] In the following, reference will be made to Figures 1 to 5 A method and an engine control apparatus for operating an engine in an intermittent combustion mode according to a first embodiment are described.
[0020] Such as figure 1 As shown, the engine 11 includes four cylinders #1 to #4 arranged in a row. The firing order of cylinders #1 to #4 is the order of cylinder #1, cylinder #3, cylinder #4, and cylinder #2. The engine 11 includes an intake passage 12 in which an air flow meter 13 is disposed. The air flow meter 13 detects the flow rate of intake air (intake air amount GA) flowing in the intake passage 12 . The intake passage 12 is also provided with a throttle valve 14 which is a flow control valve for adjusting the intake air amount GA. Furthermore, the engine 11 includes an injector 15 and a spark plug 16 provided for each cylinder. An air-fuel mixture of intake air and fuel injected from injector 15 is supplied to cylinders #1 to #4 through intake passa...
no. 2 example
[0064] In the first embodiment, in the case of obtaining the ignition cylinder ratio γ of 2 / 3, 3 / 4 or 4 / 5, by repeatedly switching the intermittent ignition type to change the interval of the skipped cylinders, suppressing the occurrence of a specific condition that is likely to disturb the occupants Occurrence of vibration and noise in the frequency band. The higher the engine speed NE, the higher the frequency of vibration and noise generated by torque fluctuations that occur when the skip cylinder interval is constant. Therefore, if the engine speed NE is higher than a certain value, even if the skip cylinder interval is fixed, vibration and noise in a certain frequency band that tends to disturb the occupants do not necessarily occur. In the second embodiment, even when an ignition cylinder ratio γ of 3 / 4 or 4 / 5 is obtained, if the engine speed NE is higher than a constant value, the intermittent combustion mode is executed at a constant skip cylinder interval.
[0065] S...
no. 3 example
[0072] In the above-described embodiment, the firing cylinder ratio γ is changed in five steps including 1 / 2, 2 / 3, 3 / 4, 4 / 5, and 1. On the contrary, the intermittent combustion mode can be executed by repeatedly switching the intermittent ignition pattern shown in Table 4 to obtain an ignition cylinder ratio γ of an intermediate value between two successive ignition cylinder ratios among the above ignition cylinder ratios. Intermediate values include 3 / 5, 5 / 7, 7 / 9 and 9 / 11.
[0073] [Table 4]
[0074]
[0075] Table 5 shows the manner in which the intermittent combustion mode is performed at firing cylinder ratios γ of 3 / 5, 5 / 7, 7 / 9 and 9 / 11. As shown in Table 5, in these cases, the skip cylinder interval is also changed by one cylinder whenever the intermittent ignition type is switched. This eliminates vibrations caused by torque fluctuations caused by skipping cylinders and included in a specific frequency band that tends to disturb the occupants.
[0076] [table 5]...
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