JP4413602B2 - Engine beat control method and apparatus - Google Patents

Description

  The present invention relates to a method for controlling the beating feeling of an engine, and more particularly to an engine beating control method and apparatus for artificially obtaining a pleasant beating feeling and a motorcycle including the apparatus.

  In a motorcycle, the user can directly feel the beating feeling of the engine, and on the contrary, enjoying such a unique beating feeling for each vehicle type is one of the real pleasures of the motorcycle. In particular, in an American type motorcycle employing a V-twin engine, there is a user's desire to feel the distinctive heartbeat unique to this V-twin.

  The “beating feeling” as used herein means that the user feels the sound generated by the engine (also referred to as sound, especially exhaust sound occupying most of it), and / or straddles a motorcycle. This is how you feel when you feel by touch (mainly vibration) through a sheet. In addition, “beating” is not a mechanical high-frequency vibration or sound, but a pulsation with a frequency that can be felt comfortably by the body, imagining the beating of horses and beasts running on the earth. is there.

By the way, for example, Patent Document 1 discloses a technique for generating a preferable exhaust sound by a special structure of a muffler.
Japanese Utility Model Publication No. 55-15304

  However, while improving the engine performance is required from the viewpoint of running performance, the user is required to improve the engine performance while experiencing the comfort that is not directly related to such performance (experienced by a person other than the passenger such as exhaust sound). In addition, it was difficult to design an engine from the viewpoint of (including feelings other than the ride comfort), in particular, to create a specific beating feeling artificially.

  The present invention has been made in view of such circumstances, and an engine beat that can artificially create a beating feeling of the engine that can produce a sense of comfort by controlling the combustion of the engine. It is an object to provide a control method and apparatus, and a motorcycle including the apparatus.

The engine beat control method for a motorcycle according to the present invention is based on a combustion pattern using a fuel injection and / or ignition pattern as a control parameter for an EFI V-twin engine of a motorcycle so as to artificially obtain a specific beating feeling. a method of controlling Te, so the pulsation number to be sensed to the actual combustion times before Symbol V-twin engine is 1/4 or less, to the particular beating sense including the sleep periodic combustion characterized in that control the combustion of the previous SL engine based on the corresponding combustion pattern.

In addition, the engine beating control apparatus for a motorcycle according to the present invention is a combustion pattern in which an EFI V-twin engine of a motorcycle uses a fuel injection and / or ignition pattern as a control parameter so as to artificially obtain a specific beating feeling. an apparatus for controlling on the basis of, as the pulsation number to be sensed to the actual combustion times before Symbol V-twin engine is 1/4 or less, the specific beating including the sleep periodic combustion characterized in that it comprises braking Gosuru combustion control means combustion before SL engine based on the combustion pattern corresponding to the sensitive.

  According to the above-described invention, it is possible to artificially obtain the beating feeling of the engine that feels specific comfort by controlling the combustion pattern.

  In the above invention, for example, it is possible to store a combustion pattern in advance and control the combustion of the engine based on this combustion pattern, or to generate a random number and to generate a specific beat based on this random number. It is also possible to generate a combustion pattern corresponding to the feeling and to control the combustion of the engine based on this combustion pattern.

The combustion pattern includes a pause of combustion, at least a reduction in the fuel injection amount, or may include a pause of the fuel injection, and further, contains a pattern of the fuel injection and / or ignition of the engine May be .

  The control based on the combustion pattern corresponding to such a specific pulsation feeling may be executed at full time, or the user selects ON / OFF of this control to execute at part time. It is also possible to equip a switch that can select any desired pattern from a plurality of different patterns.

  Hereinafter, an engine beating control method and apparatus and a motorcycle including the apparatus according to the present invention will be specifically described with reference to the accompanying drawings.

  In particular, among V-twin engines, there are motorcycles equipped with an engine that generates a unique beating feeling that is desirable for the user, and the mechanism by which such an engine generates a preferable beating feeling has been analyzed strictly. It never happened. First, as shown in FIG. 1A, the inventor of the present application samples the exhaust sound pressure of the V-twin engine that generates such a unique beating feeling in time series (here, 2nd speed, 20 km / second). Accelerated from running at h and sampled over 7 cycles, that is, combustion for a total of 14 front and rear cylinders), as shown in FIG. 1 (b), similar to the exhaust sound pressure of a general engine And compared with the data sampled.

  In FIG. 1B, 6 cycles could be sampled within a predetermined time. As can be seen from the sound pressure waveform in FIG. 1B, the sound pressure level in each cycle repeats a substantially constant waveform, and the “mountains” and “valleys” of the sound pressure levels are clear. In this case, there were 12 “mountains” on the waveform, but in reality, they were recognized by hearing as sounds of about 6 times.

  On the other hand, in FIG. 1A, although the combustion for 14 times is sampled within the same predetermined time, the sound pressure level in each combustion is irregular as can be seen from the sound pressure waveform. The sound pressure level “mountain” and “valley” are unclear. For this reason, although there should be 14 “mountains”, in reality, only about 3 to 4 sounds, much less than in the case of FIG.

  That is, in the sampling of FIG. 1 (a), the engine of FIG. 1 (a) is actually more in spite of the fact that it should have burned more times than the sampling of FIG. 1 (b). It feels like it is operating at a low engine speed. It has been found that the sound pressure level in each combustion is irregular and seems to be generated by experiencing the synthesized sound of several exhaust sounds as one exhaust sound.

  Therefore, the present inventor recorded and extracted one combustion portion from the sound pressure waveform of FIG. 1 (a) so that the portion with a sound pressure level of “medium” is indicated as the range of “A” in FIG. 2 (a). I tried to play this continuously and repeatedly. However, in this case, since the exhaust sounds are equally spaced, it was felt by the auditory sense as being far from the beating feeling unique to the V-twin engine (that is, a sound like a single cylinder engine). Next, the inventor of the present application applied the crank as shown in the range of “B” in FIG. 2A, where the sound pressure level continues from “medium” and “medium” from the sound pressure waveform of FIG. As shown in FIG. 2 (a), recordings were extracted for two rotations of the shaft or four rotations of the crankshaft, and this was continuously repeated. This time, since the exhaust sounds are unevenly spaced, a sound like a V-twin engine was obtained (however, the exhaust sound in this case is felt as two pulsations even for four combustions). Next, the inventor of the present application shows a portion where the sound pressure level changes from “medium”, “medium”, “large”, and “small” from the sound pressure waveform of FIG. The recording was extracted like this, and this was reproduced continuously and repeatedly. Then, this time, it is perceived as a series of sounds with “small” as a break, and it can be felt as one pulsation even for four combustion portions. That is, the sound pressure level is “medium”, “medium”, “medium”, “medium”, etc., rather than continuous at a constant level, for example, “medium”, “medium”, “large”, “small”, and so on. It seems that one pattern continues with a period longer than actual as the whole changes, and this has been found to be a factor of so-called “preferable heartbeat”.

  More specifically, since the sound pressure level changes like “medium”, “medium”, “large”, “small”, and so on, it seems that “small” is continuous with “large” immediately before it. It feels like a triple time as a whole. Therefore, here, the cyclic change of the series of sound pressure levels that constitute the above-mentioned “preferable heartbeat” is the triple time of “medium”, “medium”, “large”, “small”, etc. as described above. In addition to the above pattern, for example, a pattern of “medium”, “large”, “medium”, “(pause)”, “medium”, “(pause)”, etc. What is necessary is just to incorporate the depression into one pattern (here, this is referred to as “one beat cycle”).

Next, the inventor of the present application sampled the exhaust sound during idling (about 720 r / min) of the V-twin engine as shown in FIG. Since the engine is rotating at about 720 r / min, it should feel about 12 exhaust beats per second, but in reality, it is about 2 “beat cycles” as a whole. Two heartbeats were experienced. As can be seen from the sound pressure waveform in FIG. 3, in particular, the exhaust sound of the front cylinder shows a substantially constant sound pressure waveform for each cycle, whereas the exhaust sound of the rear cylinder shows 3 Although it becomes larger once in the cycle, the other two times cannot recognize a clear waveform.

Next, the inventor of the present application sampled the exhaust sound when the V-twin engine rotates about 1200 r / min as shown in FIG. Since the engine is rotating at about 1200 r / min, the exhaust sound pulsation should be felt about 0.6 times in 0.6 seconds, as described above, but in reality, about 3 times as a whole. “Pulse cycle”, that is, a total of 3 pulsations were experienced. As can be seen from the sound pressure waveform of FIG. 4A, in particular, the exhaust sound of the rear cylinder can recognize a clear waveform only once every two cycles. In this way, the number of exhaust sounds in terms of sensation is determined by the “interval (or pause)” of the exhaust sounds.

  Although only the exhaust sound has been described here, the exhaust sound also appears as vibration of the entire engine and motorcycle as a factor of the above-mentioned beating feeling, and these are treated as synonymous in this specification.

  In other words, in order to artificially generate the “between” of the exhaust sounds as described above, by controlling the combustion in accordance with the “preferable heartbeat” rhythm as shown in FIG. The V-twin engine can also be changed to a “preferable heartbeat” engine. For example, the combustion control may be performed by setting a combustion pattern in which combustion is stopped for each cylinder. More specifically, for example, the injection timing and / or the injection amount of fuel supplied to the engine, This can be realized by setting a combustion pattern that manipulates the ignition timing. Such a combustion pattern can be variously set according to the “preferable beating feeling” as described above.

  Next, an embodiment of a motorcycle employing the method according to the present invention will be specifically described.

  As shown in FIG. 5, the motorcycle 1 of the present embodiment is a so-called “American type” large-sized vehicle, and an EFI V-type 2-cylinder 4-cylinder is provided at the center of a body frame 2 made of a pipe material. A cycle OHV engine E is mounted, and a steering column (not shown) extending in a substantially vertical direction with a relatively large caster angle is pivotally supported at the front portion of the frame 2. A steering bar handle 3 is fixed to the upper end of the steering column, while the lower portion of the steering column is connected to a pair of front forks 4 (only the left front fork is shown in FIG. 5). Are connected to a front wheel 5 for steering. As a result, the driver straddles the handle 3 on the seat S attached to the rear upper part of the frame 2, and the front wheel 5 is steered left and right by rotating the handle 3 around the steering column. Can be done.

  Further, a rear wheel 7 is connected to the rear portion of the frame 2 via a rear suspension 6 (only a part of which is shown). It is driven via a type drive device or the like.

  Further, below the seat S, an ECU (Electronic Control Unit) 10 that controls combustion of the engine E is disposed. As shown in FIG. 6, the ECU 10 includes a combustion pattern storage unit 11 and is connected to fuel injection devices 21 and 22 and ignition devices 23 and 24 for the front and rear cylinders of the engine E. Further, the ECU 10 is connected to an ON / OFF switch 14 that can be operated by a user provided at an appropriate position of the vehicle body.

  As shown in the flowchart of FIG. 7, the ECU 10 first determines whether the ON / OFF switch 14 is ON or OFF (step S1-1), and if it is ON, A combustion pattern stored in advance is read from the combustion pattern storage unit 11 (step S1-2). The combustion pattern stored in the combustion pattern storage unit 11 is, for example, combustion / combustion stop data corresponding to each cylinder as shown in the timing chart of FIG. The “combustion stop” in the present invention is performed by, for example, operating the fuel injection and / or ignition as described above, and only reduces the fuel injection amount, and may not stop the combustion completely. It is included in the combustion stop at.

  Next, the ECU 10 generates a command signal for the fuel injection devices 21 and 22 and / or the ignition devices 23 and 24 based on the read combustion pattern, and controls combustion (step S1-3).

  On the other hand, when the ON / OFF switch 14 is OFF, the ECU 10 performs normal combustion control without performing control based on the stored combustion pattern (step S1-4).

  In another embodiment, as shown in FIG. 8, the ECU 10 includes a random number generator 12 and a combustion pattern determiner 13 inside, and a fuel injection device for the front and rear cylinders of the engine E. 21 and 22 and ignition devices 23 and 24 are connected. Further, the ECU 10 is connected to an ON / OFF switch 14 that can be operated by a user provided at an appropriate position of the vehicle body.

  As shown in the flowchart of FIG. 9, the ECU 10 first determines whether the ON / OFF switch 14 is ON or OFF (step S2-1), and if it is ON, A random number is generated by the random number generator 12 (step S2-2), and a combustion pattern is determined based on the generated random number (step S2-3). The determination of the combustion pattern based on a random number is performed by, for example, generating a number from 1 to 3 using a random number, and when “1” is generated, the combustion of the last rear cylinder is stopped in the combustion for two cycles. In addition, when “2” is generated, the combustion of the rear cylinder is similarly stopped for two cycles. Thus, for example, the combustion pattern may be determined every two cycles, or may be performed every other time length.

  Next, the ECU 10 generates a command signal for the fuel injection devices 21 and 22 and / or the ignition devices 23 and 24 based on the determined combustion pattern, and controls combustion (step S2-4).

  On the other hand, when the ON / OFF switch 14 is OFF, the ECU 10 performs normal combustion control without performing control based on the stored combustion pattern (step S2-5).

  As described above, according to the engine beat control method and apparatus and the motorcycle including the apparatus according to the present invention, the engine beat capable of producing a comfortable feeling by controlling the combustion of the engine. The present invention has an excellent effect that a feeling can be artificially created.

It is a graph which shows the data which sampled the exhaust sound pressure of V-twin engine in time series, (a) is the exhaust sound of V-twin engine which produces a "preferable beating feeling", (b) is general This is the exhaust sound of a V-twin engine. (A) shows a waveform when a sound pressure level portion of “medium” level is extracted from FIG. 1 (a) and continued for two cycles, and FIG. The waveform is shown in the case where the sound pressure level portions that are continuous as “medium”, “medium”, “large”, and “small” are extracted in two cycles. 6 is a graph showing data obtained by sampling the exhaust sound pressure at the time of idling (about 720 r / min) of a V-twin engine that generates a “preferable heartbeat” in time series. (A) is a graph of the data obtained by sampling the exhaust sound pressure during the running of the V-twin engine (about 1200 r / min) that generates a “preferable heartbeat” in time series, and (b) corresponds to this. It is a timing chart which shows the combustion timing to perform. 1 is a left side view showing an overall configuration of a motorcycle adopting a method according to an embodiment of the present invention. FIG. 2 is a block diagram showing a combustion pattern control system for the motorcycle shown in FIG. 1. It is a flowchart which shows the control procedure of ECU in the combustion pattern control system shown in FIG. FIG. 4 is a block diagram showing a combustion pattern control system for a motorcycle according to another embodiment shown in FIG. 1. It is a flowchart which shows the control procedure of ECU in the combustion pattern control system shown in FIG.

1 motorcycle
2 Body frame
3 Bar handle
4 Front fork
5 Front wheel
6 Rear suspension
7 Rear wheel
10 ECU (Electronic Control Unit)
11 Combustion pattern memory
12 Random number generator
13 Combustion pattern determination unit
14 ON / OFF switch
21, 22 Fuel injector
23, 24 Ignition system

Claims (6)

A method of controlling an EFI V-twin engine of a motorcycle based on a combustion pattern using a fuel injection and / or ignition pattern as a control parameter so as to artificially obtain a specific beating feeling,
As the pulsation number to be sensed to the actual combustion times before Symbol V-twin engine is 1/4 or less, before based on the combustion pattern corresponding to the specific beating sense including the sleep periodic combustion motorcycle engine beating control wherein the control Gosuru that the combustion of the serial engine. An apparatus for controlling an EFI V-twin engine of a motorcycle based on a combustion pattern using a fuel injection and / or ignition pattern as a control parameter so as to artificially obtain a specific beating feeling,
As the pulsation number to be sensed to the actual combustion times before Symbol V-twin engine is 1/4 or less, before based on the combustion pattern corresponding to the specific beating sense including the sleep periodic combustion serial motorcycle engine beating control device characterized by comprising a braking Gosuru combustion control means combustion engine. Further comprising combustion pattern storage means for storing the combustion pattern;
3. The engine beat control device for a motorcycle according to claim 2, wherein the combustion control means controls combustion of the engine based on a combustion pattern stored in the combustion pattern storage means. Random number generating means for generating a random number;
Combustion pattern generation means for generating a combustion pattern corresponding to the specific heartbeat based on the random number generated by the random number generation means,
3. The engine beat control device for a motorcycle according to claim 2, wherein the combustion control means controls the combustion of the engine based on the combustion pattern generated by the combustion pattern generation means. The engine beating control apparatus for a motorcycle according to any one of claims 2 to 4, wherein the combustion pattern includes at least a decrease in fuel injection amount or a pause in fuel injection. A switch that can be operated by the user is further provided.
The motorcycle according to any one of claims 2 to 5 , wherein the combustion control means switches ON / OFF control of combustion of the engine based on the combustion pattern in accordance with an operation of the switch. of the engine beating controller.

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