JP3856194B2 - Engine ignition control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine ignition control device, and more particularly to an engine ignition control device capable of limiting engine output in a relatively low engine speed range.
[0002]
[Prior art]
There is known a device that suppresses engine speed by stopping ignition (hereinafter referred to as “misfire” in this specification) for all cylinders or half of the cylinders when the engine speed exceeds a predetermined value. Yes. For example, Japanese Patent Application Laid-Open No. 60-17244 describes an overspeed prevention device that sets a reference rotation speed corresponding to engine rotation acceleration and misfires the engine rotation speed so as not to exceed the reference rotation speed to suppress the engine rotation speed. ing.
[0003]
[Problems to be solved by the invention]
The conventional overspeed prevention device controls ignition so as not to exceed a reference rotational speed set in a relatively high rotational speed range. However, even if it is not in the high speed range, for example, there are cases where it is desired to suppress the output by setting the rotational speed to a predetermined value or less during sudden acceleration in order to improve durability and achieve low fuel consumption.
[0004]
Moreover, it may be convenient for a beginner user during driving learning. However, if the misfire is simply caused to exceed the planned rotational speed, it is difficult for the user to recognize that the engine speed has been suppressed due to the rapid acceleration operation, and therefore a learning effect cannot be expected. Therefore, an apparatus that allows the user to learn that the rapid acceleration operation has been performed is desired. In addition, it is expected that the determination process for misfiring can be simplified so that a quick response to a rapid acceleration operation is possible.
[0005]
An object of the present invention is to solve the above-described problems and to provide an engine ignition control device capable of suppressing the engine speed even in a region other than a high engine speed range.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a sudden opening detection means for detecting a sudden opening of a throttle based on a rate of change in throttle opening, and a misfire mode for setting a misfire mode when a sudden opening of the throttle is detected. A setting means; an engine speed detecting means for detecting the engine speed; a misfire instruction means for outputting a misfire instruction when the engine speed is equal to or greater than the misfire speed while the misfire mode is set; The present invention is characterized in that it comprises return means for ending the misfire mode when the rotational speed becomes equal to or lower than the return rotational speed set lower than the misfire rotational speed.
[0007]
According to the above feature, when the throttle is suddenly opened, the misfire mode is entered, and during this misfire mode, the engine speed is suppressed below the misfire speed. The misfire mode is maintained until the engine speed drops below the return speed. During this time, a misfire instruction is output any number of times based on the misfire speed, and the engine speed does not rise above the misfire speed.
[0008]
Further, the present invention has a second feature in that the return rotational speed is set to a value equal to or lower than the rotational speed of the centrifugal clutch connected or substantially equal to or lower than the engine rotational speed at which driving force is transmitted to the rear wheels. There is. Further, the third feature is that when the engine speed is the return speed, the return speed is set so that the vehicle has a low vehicle speed of 1 km / h or less. According to the second and third features, when the acceleration operation is performed immediately after the vehicle starts to travel or in an extremely low speed traveling state, the state can be quickly dealt with and misfired without determining the throttle. it can.
[0009]
Furthermore, the present invention has a fourth feature in that a misfire mode selection switch is provided, and the misfire mode can be set when the misfire mode selection switch is energized. According to this feature, the misfire mode can be selected according to the preference of the running state.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings. FIG. 2 is a perspective view of a main part of a scooter type vehicle which is an example of a motorcycle incorporating the engine ignition control device of the present invention. In the figure, a battery 12 is mounted inside a step floor 11 that is a part of a vehicle body cover 10, and an ignition coil 13 is disposed behind the battery 12. Further, behind the ignition coil 13, an ignition plug 14 and a pulse generator 15 for detecting the rotation angle of the crankshaft are provided around an engine (not shown). In this motorcycle, the rotation of the engine is transmitted to the rear wheels by a centrifugal clutch.
[0011]
Further, a synthetic resin storage box 20 capable of storing a throttle sensor 17, an ignition control unit 18, a fuel tank 19, a helmet, and the like is provided in the side cover 16 that covers the rear portion of the vehicle body from both sides. A misfire mode selection switch 25 for selecting the misfire mode is provided inside the storage box 20 (see FIGS. 3 and 4 for the installation position). A sheet 21 that also serves as a lid is provided on the upper portion of the storage box 20. A main switch 23 is provided on the upper part of the leg shield 22 that covers the front of the driver's foot.
[0012]
It is possible to provide a function of automatically stopping the engine when the vehicle is stopped and restarting it only by grip operation of the steering wheel. A seat switch 24 for enabling this function only when seated is provided in front of the seat 21. It can be provided in the part.
[0013]
3 is a plan view of the storage box 20 showing the installation position of the misfire mode selection switch 25, and FIG. 4 is a side sectional view of the same. As shown in both figures, the misfire mode selection switch 25 is disposed on the front right wall surface in the storage box 20. This installation position is an example, and is not limited to this as long as the storage space for a helmet or the like is not narrowed.
[0014]
FIG. 5 is a system diagram of the motorcycle ignition device. In the figure, the positive terminal of the battery 12 is connected to the ignition control unit 18 via the main switch 23. A main fuse 26 is provided between the main switch 23 and the battery 12. Input signals from the pulse generator 15, the throttle sensor 17, and the misfire mode selection switch 25 are supplied to the ignition control unit 18. Then, the ignition control unit 18 performs scheduled ignition processing based on the signals supplied from these, and supplies current to the ignition coil 13 to ignite the spark plug 14. The battery 12 is also connected to a load such as a lighting device or a safety device via the main switch 23 and the fuse 27.
[0015]
FIG. 6 is a diagram showing an example of changes in the throttle opening θTH and the engine speed Ne when the misfire mode selection switch 25 selects the misfire mode. When the misfire mode is selected, the mode is switched to the misfire mode when the rate of change in the throttle opening θTH (throttle opening change rate ΔθTH) exceeds a preset value. After switching to the misfire mode, the engine is misfired when the engine speed exceeds a predetermined misfire speed Ne1.
[0016]
In FIG. 6, as indicated by a line L1, the throttle opening change rate ΔθTH exceeds the predetermined value ΔθTHR at time t1, and the mode is switched to the misfire mode. At time t2, the engine speed Ne becomes equal to or less than the preset return speed Ne2, and the misfire mode returns to the normal mode. That is, after the throttle opening change rate ΔθTH exceeds the predetermined value ΔθTHR, the misfire mode is performed between the time t1 and the time t2 when the engine speed Ne is equal to or higher than the return speed Ne2. In this misfire mode period, since the engine speed Ne exceeds the misfire speed Ne1 at time t3, misfire occurs and the increase in the engine speed Ne is suppressed. At time t4, the engine speed Ne becomes less than the misfire speed Ne1, and the misfire is stopped. That is, misfire is occurring between time t3 and time t4.
[0017]
After switching to the misfire mode, the misfire mode is maintained until the engine speed Ne becomes less than the return speed Ne2. Therefore, for example, when the throttle valve is suddenly closed and reopened suddenly from the misfire speed Ne1, the throttle opening θTH is not determined, and the engine is misfired if the engine speed Ne becomes equal to or greater than the misfire speed Ne1. In other words, the fire is immediately misfired only by determining the engine speed Ne.
[0018]
If the engine speed Ne exceeds the misfire speed Ne1, the rapid opening operation is not performed, and if the throttle opening change rate ΔθTH exceeds the predetermined value ΔθTHR when the misfire speed Ne1 is exceeded, the fire is immediately misfired (in the figure). Line L2).
[0019]
The misfire rotation speed Ne1 is set to 4500 rpm, for example. The return rotational speed Ne2 is equal to or lower than the centrifugal clutch disengagement rotational speed (for example, 3500 rpm), or the rotational speed at which the engine driving force is actually transmitted to the rear wheels after the centrifugal clutch is connected (for example, 4200 to 4300 rpm). It is good to set to. Below these speeds, the vehicle speed is around 1 km / h. Therefore, speed increase due to rapid acceleration is prohibited when the vehicle is moving substantially.
[0020]
In the figure, the fast idle speed Nei1 is a set value for the idle speed immediately after starting, and the idle speed Nei2 is a set value for maintaining the idle state after acceleration from the fast idle speed Nei1.
[0021]
The rapid acceleration point fire control including the misfire mode will be described with reference to the flowchart of FIG. In FIG. 7, in step S1, it is determined whether or not the throttle opening change rate ΔθTH is equal to or greater than a predetermined value ΔθTHR. For example, when the throttle opening θTH is read once every 13.1072 milliseconds and the rate of change based on the read data for 15 times of the throttle opening θTH is 15% or more, the determination in step S1 is affirmative. Note that the determination in step S1 may be performed every time the throttle opening θTH is read, or based on the 15 previous reading data when the throttle opening θTH is read a plurality of times (2 to 4 times). You may go. If step S1 is positive, the process proceeds to step S2, and if negative, the process proceeds to step S4.
[0022]
In step S2, it is determined whether or not the engine speed Ne is equal to or greater than the misfire speed Ne1. If this determination is affirmative, the process proceeds to step S3, and ignition is prohibited (misfire). On the other hand, if the engine speed Ne is less than the misfire speed Ne1, the routine proceeds to step S4 where ignition is permitted. In step S5, it is determined whether or not the engine speed Ne has become equal to or greater than the misfire speed Ne1. If this determination is affirmative, the routine proceeds to step S6, where it is determined whether or not to return from the misfire mode depending on whether or not the engine speed Ne is equal to or less than the return speed Ne2. If this determination is affirmative, the process proceeds to step S1 to return from the misfire mode to the normal mode. If the determinations in steps S5 and S6 are negative, the process proceeds to step S2.
[0023]
FIG. 1 is a block diagram showing main functions for rapid acceleration point fire control. The opening degree change rate detection unit 28 detects the throttle opening degree change rate ΔθTH based on the throttle opening degree θTH detected by the throttle sensor 17 and inputs it to the misfire mode setting unit 29. The misfire mode setting unit 29 sets the misfire mode depending on whether or not the throttle opening change rate ΔθTH is equal to or greater than the set value ΔθTHR. The pulse generator 15 outputs a pulse corresponding to the rotation of the crankshaft, and the rotational speed detector 30 counts this pulse and outputs the engine rotational speed Ne. The misfire instruction unit 31 responds to the setting of the misfire mode, compares the engine speed Ne with the misfire speed Ne1, and outputs a misfire signal when the engine speed Ne is equal to or greater than the misfire speed Ne1.
[0024]
The ignition instruction unit 32 outputs an ignition instruction signal for energizing the ignition coil 13 at a predetermined ignition timing. This ignition instruction signal is invalidated when the misfire signal is output, and as a result, the spark plug 14 is misfired. The return determination unit 33 as a return means makes a return determination in response to the misfire signal, and resets the misfire setting unit 29 when the engine speed Ne is less than the return speed Ne2.
[0025]
【The invention's effect】
As is apparent from the above description, according to the first to fifth aspects of the present invention, once the throttle is suddenly opened, the engine speed is reduced unless the engine speed is equal to or lower than the return speed. Every time the number exceeds the misfiring speed, the engine speed does not increase because the misfire is repeated any number of times. Therefore, it is easy to recognize that the user has performed the throttle opening operation. Also, once the throttle is suddenly opened, whether or not a misfire occurs only by determining the engine speed without determining the throttle opening unless the engine speed is equal to or lower than the return speed. Since it can be determined, a quick opening operation immediately after the quick closing can be quickly handled.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of a main part of an ignition control device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main part of a motorcycle including the ignition control device of the present invention.
FIG. 3 is a plan view of a storage box showing a position of a misfire selection switch.
FIG. 4 is a side sectional view of a storage box showing a position of a misfire selection switch.
FIG. 5 is a system diagram of an ignition control device.
FIG. 6 is a graph showing changes in engine speed and throttle opening.
FIG. 7 is a flowchart of ignition control.

Claims (5)

Throttle opening change rate detecting means for detecting the change rate of the throttle opening;
Sudden opening detection means for determining that the throttle is suddenly opened when the change rate detected by the throttle opening change rate detection means exceeds a predetermined value ;
Misfire mode setting means for setting a misfire mode when a sudden opening of the throttle is detected;
Engine speed detecting means for detecting the engine speed;
Misfire instruction means for outputting a misfire instruction when the engine speed is equal to or higher than the misfire speed while the misfire mode is set;
An engine ignition control device comprising: a return means for ending the misfire mode when the engine speed becomes equal to or lower than a return speed set lower than the misfire speed.   2. The engine ignition control device according to claim 1, wherein the return rotational speed is set to a value equal to or less than a connected rotational speed of the centrifugal clutch.   2. The engine ignition control device according to claim 1, wherein the return rotational speed is set to be substantially equal to or lower than an engine rotational speed at which driving force is transmitted to the rear wheels.   2. The engine ignition control device according to claim 1, wherein in the state where the engine speed is the return speed, the return speed is set so that the vehicle has a vehicle speed of 1 km / h or less.   The engine according to any one of claims 1 to 4, wherein a misfire mode selection switch is provided, and the misfire mode can be set when the misfire mode selection switch is energized. Ignition control device.

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