JPS58202371A - Ignition time control device for internal combustion engine mounted on vehicle - Google Patents

Abstract

PURPOSE:To permit a drive force in low speed change position not to be limited by detecting the speed change position of a speed change means for a vehicle and controlling ignition time in response to the speed change position. CONSTITUTION:A speed change position detector 1 generates detecting signals when it is in the speed change position giving the maximum vehicle speed. The detecting signal is supplied to a switch SW through a drive circuit 2 to turn on the switch SW. When the switch is turned on, a resistance R5 is short-circuited to work only a Zener diode ZD. Thus the max. vehicle speed can be limited and maneuverability can be improved without limiting a drive force in the low speed change position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-ignition IIυIID calendar for a vehicle-mounted internal combustion engine.

There are cases where the output of the engine itself is suppressed in order to limit the maximum speed of a vehicle such as a motorcycle, especially a vehicle equipped with a low-fuel engine.

Conventionally, in order to suppress engine output and limit speed, it has been common to control ignition timing and the like to suppress engine output at a predetermined engine speed or higher to a predetermined output or less. However, when the engine output is suppressed in this way, not only the maximum speed of the vehicle but also the acceleration force or climbing force are limited, so there is a problem that appropriate driving performance per minute cannot be obtained.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ignition timing control system for an on-vehicle internal combustion engine that can limit the maximum speed of a heavy vehicle and improve drivability.

The ignition timing III control device according to the present invention includes shift position detection means for detecting a predetermined shift position of the transmission means of the vehicle's driving force transmission mechanism (GJ), and changes the ignition timing in accordance with an output signal of the shift position detection means. It's done in a way that makes you feel bad.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, EX is an exciter coil, P is a pickup coil, IG is an ignition coil, P[ is a spark plug,
Th indicates a thyristor, and 7[) indicates a tuner diode. 2 lil f x 1. L-T.

For example, a flywheel magnet attached to the crankshaft throat of an engine (not shown) generates an alternating current voltage when the engine rotates, and this voltage is passed through a diode D.
+, D2 performs half-wave rectification to charge the capacitor C1.

For example, when the rotation angle of the crankshaft 1 shift is at a predetermined rotation angle, an alternating current voltage is induced in the coil P, and this alternating voltage is applied to the resistors R1 to R5, the transistor Q, the diodes A to D3 . Thyristor Th
Ai! On the other hand, the shift position detector I LL indicates a predetermined speed position of the transmission (not shown) that can obtain the maximum continuous speed, for example, a 4-speed forward shift. , generates a detection signal when in 4th gear,
The detection signal is supplied to the switch SW via the drive circuit 2 to turn on the switch SW.

The switch SW is connected in parallel to a resistor R5, and the resistor R5 is connected in series to a Zener diode 7D. The current-voltage characteristics of the series circuit of resistor R5 and Zener diode ZD are affected by the voltage across resistor R5 when the applied voltage becomes higher than the Zener voltage Vo of Zener diode ZD as shown by the solid line in Figure 2 when switch SW is off. It has a constant slope, and when the switch SW is on, it has the characteristics of only the Zener diode ZD as shown by the broken line B in FIG.

An AC signal voltage as shown in Fig. 3 (J) is induced in the pickup coil P, but only the positive half cycle is shown in the figure.The peak of this voltage becomes larger as the engine speed Ne increases. In other words, in Figure 3, Na
<Ni<NO.

As represented by the curve Na, when the engine speed is low, the peak value of the induced voltage due to the coil P is the Zener diode 7.
When the voltage rises within a range that does not exceed the Zener voltage VD caused by
A photoelectric charge is made. Therefore, the potential of the gate (ie, 0 point) of the thyristor [11] is approximately equal to the ground potential.

The peak value of the induced voltage in the coil P is
If the Zener voltage of D is lower than Vo! The state continues until the induced voltage reaches its peak value. When the peak value is exceeded, the current no longer flows to the transistor 0, so the transistor 0 is turned off, and the potential at point C rises, causing a -1-rega current to flow from the coil P to the circuit from resistors R1 to R4 to the gate of thyristor Th. flows.

Therefore, the gate of thyristor Th (0 point) (JIL 3rd
A voltage is generated at the curve Na in the diagram (0), and the thyristor Th is turned on. This is MJ, linear capacitor C1
The spark plug ρ1 from which the electric charge is discharged is excited. That is, in a range where the engine speed is (It < 2) and the induced voltage P does not exceed the Zener voltage Vo of the Zener die door O, the peak point of the induced voltage waveform becomes the ignition timing.

]-The engine rotational speed increases and the voltage of coil P increases.
When the electric sweat V [) is exceeded, the potential at point a becomes as shown in Fig. 3 (
The induced voltage is clamped to the Zener voltage Vo, and then the voltage at point b gradually decreases because current flows through the resistor R5. Then, at the peak point of the induced voltage waveform of the coil P, a single point voltage G
5 is held constant by capacitor C2. Only when the induced voltage decreases below this constant maintenance voltage does the transistor Q turn off, trigger current flows into the thyristor Th, and ignition is started.

Here (・, change; *When the machine is switched to a predetermined shift position, a detection signal is generated from the shift position detector 1,
The detection signal turns on the switch SW via the drive circuit 2. At this time, if the induced voltage in the coil 1) becomes, for example, as shown by the curve Nc in FIG. 3(a), the induced voltage is clamped to the Zener voltage Vo and becomes as shown in FIG. With the coil P→resistance R+→
Zener diode Z [) → Base of transistor Q →
Current flows through the path from emitter to coil P, keeping transistor Q on. When the induced voltage exceeds the peak value -C begins to decrease and becomes less than the Zener voltage Vo, the transistor Q
Since the base current is no longer supplied, the transistor Q is turned off. Therefore, the gate of thyristor T t+ (0 point)
A trigger voltage as shown by the curve Nc- in FIG. 3(C) is generated, and the thyristor Th is turned on to cause ignition.

That is, in this state, the moment when the induced voltage of the coil P exceeds the peak value and becomes lower than the Zener voltage becomes the ignition timing. Then, the output voltage of the pickup coil P increases as the engine rotation speed increases, and on the other hand, since the Zener voltage V I) is constant, it increases as the engine rotation speed increases. Therefore, the ignition timing will be delayed by 1.1 points, so the ignition timing will also be delayed.

Therefore, as shown in FIG. 4, the ignition timing is approximately constant below the first engine rotation speed N+, where the induced voltage of the engine P is below the Zener voltage Vo, and the ignition timing is approximately constant between the first engine rotation speed N1 and the second engine rotation speed N2. In the range of , the ignition angle is gradually retarded, and except for the predetermined shift position at high speeds above the second engine rotation speed N2, the ignition timing becomes a nearly constant smaller advance angle again, and at the predetermined shift position, the ignition angle is gradually retarded. The ignition angle is further controlled to be retarded.

As a result, even if the engine speed is increased to the maximum speed, the limited vehicle speed is not reached. For example, when the transmission is in a low gear position such as 1st gear, the engine output will be as shown by the solid line in Figure 5. Good output characteristics are obtained, but when the vehicle speed reaches the limit when the engine speed is increased, at a predetermined shift position such as 4th gear, the engine output decreases to the second engine speed as shown by the broken line E in Figure 5. At N2 or higher, the output characteristic rapidly decreases.

FIG. 6 shows the relationship between the vehicle speed and the driving force of the vehicle when the transmission has four forward speeds. In the figure, ・Fl
or F4 are the characteristics of 1st speed to 4th speed,
Originally, the maximum speed in 4th gear that can achieve speed Y/2 as the maximum speed is the limit speed'? /1. Note that the curve G shows running resistance.

As described above, according to the ignition timing control i11 device of the present invention,
It includes a shift position detection means for detecting a predetermined shift position of the vehicle's transmission means, and is configured to change the ignition timing in accordance with the output signal of the shift position detection means, so that the driving force at the low speed shift position is 1.
111, it is possible to limit the maximum speed of the vehicle and improve drivability.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a current-voltage characteristic diagram of the i-series circuit of the Zener diode and resistor shown in FIG. 1, and FIG. 3 (Tanai C) 4. L An operating waveform diagram of the circuit in Figure 1, Figure 4 is a diagram of the relationship between engine speed and ignition advance angle by the circuit in Figure 1, Figure 5 is an engine output characteristic diagram,
FIG. 6 is a diagram showing the relationship between vehicle speed and driving force. Explanation of symbols of main parts Ex...Exciter coil P...Pickup coil 1G...Ignition coil PI...Spark plug...Shift position detection Applicant Honda Motor Co., Ltd. Agent Patent Attorney Motohiko Fujimura 4 Figure IE, 6 Figure 5 Figure Engine wtm turn

Claims (2)

[Claims] (1) The drive transmission mechanism 111 of the vehicle includes a shift position detection means for detecting a predetermined shift position of 9th gear and 1st gear and outputting a detection signal, and changing the ignition timing in accordance with the detection signal. An in-vehicle internal combustion engine fire timing control device, which is characterized by being designed as follows. (2) The predetermined shift timing control device according to claim 1, wherein the predetermined shift position control driving force transmission ratio is a minimum shift position.