JPH02209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vehicle speed limiting device that limits the speed of a vehicle driven by an internal combustion engine via a transmission to a set value or less.

Prior Art A conventional device of this type detects the rotational speed of an internal combustion engine and, when the engine rotational speed reaches a set value, delays the ignition position or causes a misfire to reduce the engine rotational speed. There is something I did. However, with this configuration, the set speed of the engine is kept constant regardless of the switching position of the transmission, so the speed limit of the vehicle changes significantly depending on the switching of the transmission, resulting in unstable vehicle speed. Ta.

OBJECTS OF THE INVENTION An object of the present invention is to provide a vehicle speed limiting device that can suppress fluctuations in the speed limit of a vehicle due to switching of a transmission.

Structure of the Invention A first invention of the present application is a vehicle speed limiting device that limits the speed of a vehicle driven by an internal combustion engine via a transmission to a set value or less, wherein the vehicle speed limiting device of the present invention controls the speed of a vehicle driven by an internal combustion engine via a transmission. an ignition operation state changeover switch that is connected to a part of an ignition device to ignite and can take a first state that allows operation of the ignition device and a second state that prevents operation of the ignition device; and the internal combustion engine. a speed limit setting capacitor that is charged to one polarity by the output of a generator coil provided in a generator that rotates synchronously with the generator; a speed limit setting discharge circuit that discharges the capacitor at a constant time constant; When the terminal voltage becomes lower than a predetermined level, the ignition operation state changeover switch is switched to the first
switch control for controlling the ignition operation state changeover switch so as to set the ignition operation state changeover switch to the second state and prevent the ignition operation when the terminal voltage of the capacitor is at a predetermined level or higher; A circuit detects a switching position of the transmission, and when a low speed switching position is detected, the discharging time constant of the capacitor is decreased, and when a high speed switching position is detected, the discharging time constant of the capacitor is increased. and a discharge time constant switcher for switching the time constant of the discharge circuit so as to perform the discharge circuit.

Further, the vehicle speed limiting device of the second invention of the present application further includes an auxiliary capacitor and an auxiliary capacitor discharge circuit for discharging the auxiliary capacitor in addition to the speed limit setting capacitor and the speed limit setting discharge circuit, and the auxiliary capacitor is provided to prevent charging when the speed limit setting capacitor is short-circuited, and the time constant of the auxiliary capacitor discharging circuit maintains the ignition position of the internal combustion engine even when the internal combustion engine is rotating at low speed. The terminal voltage of the auxiliary capacitor is set sufficiently large to maintain the terminal voltage of the auxiliary capacitor above the predetermined level. Further, the speed limit setting discharge circuit is connected to the speed limit setting capacitor so that the speed limit setting capacitor can be discharged even when the discharge time constant switch is disconnected from the speed limit setting capacitor. A fixed resistor is connected in parallel to the fixed resistor, and the resistance value of the fixed resistor is set to limit the speed of the vehicle to a predetermined speed limit or less when the transmission is switched to the highest speed side. ing.

As in each of the above configurations, when the time constant of the discharge circuit that sets the speed limit is switched depending on the switching position of the transmission, the set rotational speed of the engine at which the ignition operation stops becomes higher at the switching position on the low speed side. At the high-speed switching position, the set rotational speed of the engine at which the ignition operation is stopped becomes low, so fluctuations in the speed limit due to transmission switching can be suppressed, and the vehicle speed can be stabilized. In particular, when configured as in the second invention, if the transmission is switched to the low speed side when the discharge time constant switch is removed, the speed limit becomes low, making it extremely difficult to drive. Furthermore, if the speed limit setting capacitor is short-circuited, the engine will misfire and become unable to run, thus preventing the user from canceling the vehicle speed limit without permission.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 denotes a generator coil that is arranged in a magnet generator that rotates synchronously with the internal combustion engine to induce an alternating voltage. One end of the generator coil 1 is grounded.
The other end of the generator coil 1 is connected to the anode of a thyristor 2 constituting an ignition operating state switch,
The anode of the diode 3 is connected to the anode of the thyristor 2 . One end of an ignition energy storage capacitor 4 is connected to the cathode of the diode 3, and one end of the ignition coil 5 is connected to the other end of the capacitor 4.
One end of the next coil 5a is connected. The other end of the primary coil 5a is a diode 6 whose cathode is grounded.
A diode 7 with its cathode facing the ground side is connected in parallel to both ends of the primary coil. One end of the secondary coil 5b of the ignition coil 5 is grounded, and the other end is connected via a high voltage cord to a spark plug 8 attached to a cylinder of an engine (not shown). The anode of a discharge control thyristor 9 is connected to one end of the capacitor 4, and the cathode of the thyristor is grounded via the diode 6. The anode of a Zener diode 10 is connected to the gate of the thyristor 9, and a resistor 11 is connected between the cathode of the Zener diode and the cathode of the thyristor 9. In addition, the cathode of the diode 12 whose anode is grounded to the cathode of the Zener diode 10 and the diode 13
The anode of the diode 13 is connected to the anode of the diode 13, and the cathode of the diode 13 is connected to one end of the capacitor 4. Further, the anode of a diode 14 is connected to the cathode of the thyristor 9, and the cathode of the diode 14 is connected to the anode of the diode 3. Diodes 3, 7, 13, 14, capacitor 4, thyristor 9, resistor 11 and Zener diode 1
0 constitutes a capacitor discharge type ignition device 15.

One end of a resistor 20 is connected to the anode of the thyristor 2 constituting the ignition operation state switching switch,
The other end of the resistor 20 is connected to the anode of a diode 21 whose cathode is connected to the gate of the thyristor. A resistor 22 is connected between the gate and cathode of the thyristor 2, and a diode 23 is connected in antiparallel between the anode and cathode of the thyristor 2. The anode of the thyristor 24 whose cathode is grounded is connected to the anode of the diode 21, and a resistor 2 is connected between the gate and cathode of the thyristor.
5 are connected in parallel. The gate of the thyristor 24 is also connected to the anode of a Zener diode 26.
The emitter of PNP transistor 27 is connected. The collector of the NPN transistor 28 is connected to the collector of the transistor 27, and the emitter of the transistor 28 is grounded. The drain of a field effect transistor 30 is connected to the base of the transistor 27 through a resistor 29, and the source of the field effect transistor 30 is grounded.
A speed limit setting capacitor 31 is connected in parallel between the gate and source of the electric field transistor 30, and a resistor 32 is connected in parallel to the capacitor 31. Further, the drain of a field effect transistor 34 is connected to the emitter of the transistor 27 via a resistor 33, and the source of the field effect transistor 34 is grounded. field effect transistor 3
An auxiliary capacitor 35 and a resistor 36 constituting an auxiliary capacitor discharge circuit for discharging the auxiliary capacitor at a constant time constant are connected in parallel between the gate and source of the capacitor 4, and one end of the non-grounded side of the capacitor 35 is connected to a diode 37. connected to the anode. The cathode of the diode 37 is connected to the non-grounded terminal of the capacitor 31, and the cathode of a Zener diode 38 is connected to the connection point between the diode 37 and the capacitor 31. The anode of the Zener diode 38 is connected to the diode 4 via a resistor 39.
The cathode of the diode 40 is connected to the non-grounded terminal of the generating coil 1 through the diode 23. One end of a capacitor 41 and a resistor 42 are also connected to the emitter of the transistor 27, and the other ends of the resistor 41 and the capacitor 42 are connected to the cathode of a diode 43 whose anode is connected to the non-grounded terminal of the generating coil.

A discharge time constant switch 51 is connected between the non-grounded terminal 31a of the capacitor 31 and the ground. This switching device is a transmission changeover position detection switch 52 that includes a movable contact m and fixed contacts a to e that the movable contact contacts in sequence according to the changeover position of the transmission.
The movable contact m of the detection switch 52 is grounded. Of the fixed contacts a to e, contacts a and e at both ends are idle contacts, and contacts b, c and d are connected to one end of resistors 53, 55 and 55, respectively. The other ends of the resistors 53 to 55 are commonly connected, and a common connection point of these resistors is connected to the non-ground terminal 31a of the capacitor. In this example, a transmission with six forward speeds is used as the transmission, and when the transmission is in the neutral position, the movable contact m of the detection switch contacts the fixed contact a, and the transmission changes from the first gear to the third gear. When in the speed switching position, the movable contact m contacts the fixed contact b. Furthermore, when the transmission is in the 4th to 6th speed switching positions, the movable contacts m are connected to the fixed contacts c, d, and e, respectively.
come into contact with.

In this embodiment, a discharge circuit for setting the speed limit discharges the capacitor 31 for setting the speed limit with a time constant smaller than the discharge time constant of the auxiliary capacitor 35 using resistors 32, 53, 54, and 55 and the transmission changeover position detection switch 52. is configured. In this discharge circuit, the resistance values R1, R2, and R3 of the resistors 53, 54, and 55 are set to R1<R2<R3, and the parallel combined resistance value of the resistor 32 and any of the resistors 53 to 55 and the capacitor 31 The determined discharge time constant is set to be smaller than the discharge time constant determined by the resistor 36 and capacitor 35.

In this embodiment, the thyristor 24, capacitors 27, 28, Zener diode 26, diodes 37, 43, resistors 25, 29, 33, 42,
The field effect transistors 30, 34 and the capacitor 41 cause the thyristor 2 (ignition operation state changeover switch) to the conductive state (first state that allows ignition operation)
thyristor 2 (ignition operation state changeover switch) when the terminal voltage of the limit speed setting capacitor 31 is above a predetermined level or when the terminal voltage of the auxiliary capacitor 35 is below a predetermined level. A switch control circuit 56 is configured to control the thyristor 2 so as to place the thyristor 2 in a cut-off state (a second state in which ignition is inhibited).

Next, the operation of the above embodiment will be explained. When the engine is rotated by the starter and a voltage is generated in the generator coil 1, when the output voltage of the generator coil 1 in a half cycle in the direction opposite to the illustrated arrow becomes equal to or higher than the Zener voltage of the Zener diode 38, the generator coil The capacitor 31 for speed limit setting is set by the output of
and the auxiliary capacitor 35 is the Zener diode 3
8, resistor 39, and diodes 40 and 23 to the polarity shown. The electric charge of the speed limit setting capacitor 31 is transferred to the resistor 32 and the resistors 53 and 5 selected by the transmission changeover position detection switch 52.
4 or 55 (only through resistor 32 when none of resistors 53 to 55 are selected), and the charge of auxiliary capacitor 35 is discharged through resistor 36. The discharge time constant of the capacitor 35 is set to be sufficiently large so that the terminal voltage of the capacitor maintains the field effect transistor 34 in a cut-off state until the engine ignition operation is performed, regardless of the rotational speed of the engine. It is now being maintained. Thus, when field effect transistor 34 is held in the cut-off state, conduction of transistor 28 is allowed. Further, the discharge time constant of the capacitor 31 for setting the speed limit is appropriately switched depending on the switching position of the transmission, and the discharge time constant of the capacitor 31 when the transmission is in the switching position on the low speed side is
The resistance values of the resistors 53 to 55 are set so that the discharge time constant of the capacitor 31 is smaller than the discharge time constant of the capacitor 31 when the transmission is in the high-speed switching position. The capacitor 31 is discharged through the resistor 32 or through both the resistor 32 and the resistor selected by the transmission changeover position detection switch 52, and the terminal voltage of the capacitor gradually decreases. When the terminal voltage of the capacitor 31 is above a predetermined level, the field effect transistor 30 is kept in a cut-off state, thereby preventing the transistor 27 from conducting. However, when the terminal voltage of the capacitor 31 becomes less than a predetermined level, , field effect 30 becomes conductive, transistor 27
conduction is allowed. When both transistors 27 and 28 are conductive, there is a substantial short circuit between the cathode of Zener diode 26 and ground, thereby preventing the application of a firing signal to thyristor 24. In the present invention, regardless of the switching position of the transmission, if the traveling speed of the vehicle is below the speed limit, the output voltage (hereinafter referred to as positive direction output voltage) of the generator coil 1 for a half cycle in the direction of the arrow shown in the figure is ) rises, the terminal voltage of the capacitor 31 drops to a level that makes the field effect transistor 30 conductive, and if the traveling speed of the vehicle exceeds the speed limit, the capacitor 31 will not be able to discharge in time and power generation will be interrupted. When the capacitor 31 is discharged at each switching position of the transmission, the terminal voltage of the capacitor 31 maintains a magnitude that maintains the field effect transistor 30 in the cut-off state when the positive output voltage of the coil 1 rises. A constant is set.

Therefore, when the running speed of the vehicle is below the speed limit, at the same time as the positive output voltage of the exciter coil rises, an ignition signal is applied to the thyristor 2 through the resistor 20 and the diode 21, and the thyristor 2 becomes conductive. . When the thyristor 2 becomes conductive, the capacitor 4 is charged to the illustrated polarity through the thyristor 2, the diode 3, and the primary coil 5a.
Next, the generator coil 1 generates a half-cycle output voltage in the direction opposite to the illustrated arrow (hereinafter referred to as negative direction output voltage), and when the negative direction output voltage reaches a predetermined level that causes the Zener diode 10 to break down, the diode 12 and Zener diode 10
A firing signal is given to the thyristor 9 through the thyristor 9.
As a result, thyristor 9 becomes conductive and capacitor 4
of charge is discharged to the primary coil of the ignition coil.
This discharge causes a large magnetic flux change in the iron core of the ignition coil, and a high voltage is induced in the secondary coil 5b. Since this high voltage is applied to the ignition plug 8, a spark is generated in the ignition plug, and the engine is ignited.

When the running speed of the vehicle exceeds the speed limit, the terminal voltage of the capacitor 31 changes to the field effect transistor 30 at the position where the positive direction output voltage of the generating coil 1 rises.
Since the field effect transistor 30 has a size that maintains the transistor 27 in the cut-off state, the field-effect transistor 30 cannot conduct, and therefore the transistor 27 remains in the cut-off state. At this time, since the ignition signal is given to the thyristor 24 at the same time as the positive output voltage of the generating coil 1 rises, the thyristor 24 becomes conductive and blocks the supply of the ignition signal to the thyristor 2, causing the thyristor 2 to become conductive. to prevent Therefore, capacitor 4 is not charged and no ignition operation is performed. As described above, if the vehicle speed exceeds the speed limit, the engine will misfire, so the rotational speed of the engine will decrease, and the vehicle speed will be kept below the speed limit.

Figures 2A to 2C show the output voltage V of the generator coil 1 when the vehicle speed is below the speed limit, respectively.
1. The waveforms of the terminal voltage V2 of the capacitor 4 and the terminal voltage V3 of the capacitor 31 are set at the rotation angle θ of the engine.
In the figure C, et is the cutoff level of the field effect transistor 34. As is clear from these figures, when the speed of the vehicle is below the speed limit, the terminal voltage V3 of the capacitor 31 falls below the cutoff level of the field effect transistor 30 before the positive output voltage of the generating coil 1 rises. Since the engine is ignited, the engine can ignite without any problem.

Figures 3A to 3C show the output voltage V1 of the generator coil when the vehicle speed exceeds the speed limit, respectively;
Terminal voltage V2 of capacitor 4 and capacitor 31
As is clear from these figures, when the vehicle speed exceeds the speed limit, when the positive direction output voltage of the generator coil rises, the capacitor 31 is still Since the terminal voltage is above the cut-off level of field effect transistor 30, field effect transistor 30 cuts off, preventing transistor 27 from conducting and allowing thyristor 24 to conduct. Therefore, conduction of the thyristor 2 is prevented, and the ignition operation is stopped as indicated by the broken line in FIG. 3B.

FIG. 4 shows an embodiment of the present invention. In this embodiment, the thyristor 2 of the embodiment of FIG. There is. In this embodiment, the thyristor 25 is used as an ignition operation state changeover switch, and when the positive output voltage of the generating coil 1 rises, the terminal voltage of the capacitor 31 exceeds the cut-off level of the field effect transistor 30, and the transistor 27 When conduction is blocked, an ignition signal is applied to the thyristor 24, which makes the thyristor 24 conductive.The thyristor short-circuits the positive output of the generating coil 1 and prevents the ignition operation.

In the above embodiment, the negative direction output voltage of the generator coil 1 was used to give the ignition signal to the thyristor 9 of the ignition device to determine the ignition position, but as shown in FIG. A generating signal coil 60 may be provided and the output of the signal coil may be supplied via a diode 61 to the gate of the thyristor 9.

In the above embodiment, the resistance value of the resistor 32 is set so as to provide the speed limit of the vehicle when the transmission is switched to the highest speed position (6th speed).
Therefore, in the unlikely event that the non-grounded terminal 31a of the capacitor 31
If there is a disconnection between the time constant switch 51 and the time constant switch 51, the speed limit becomes lower as the transmission is switched to the lower speed side, making it extremely difficult to drive.
Furthermore, when both ends of the capacitor 31 are short-circuited, the auxiliary capacitor 35 is no longer charged, so the field effect transistor 34 becomes conductive at the same time as the positive output voltage of the generating coil 1 rises, and the transistor 28 is kept in a cut-off state. Ru. Therefore, at this time, an ignition signal is applied to the thyristor 24, and the ignition operation is prevented. That is, in the above embodiment, the user cannot arbitrarily cancel the speed limit.

In the above embodiment, an auxiliary capacitor and an auxiliary capacitor discharge circuit are provided to prevent the user from canceling the speed limit, but these are basically unnecessary, and in the above embodiment, the capacitor 3 , the resistor 36, the diode 37, the field effect transistor 34, and the transistor 28 can also be omitted.

Effects of the Invention As described above, according to the present invention, the time constant of the discharge circuit that sets the speed limit is switched depending on the switching position of the transmission, and the ignition operation is stopped at the switching position on the low speed side. The set rotational speed of the engine becomes higher, and the engine's set rotational speed is lowered, at which the ignition operation stops at the high-speed switching position, so it is possible to suppress fluctuations in the speed limit due to transmission switching, and reduce the vehicle speed. It can be made stable. In particular, according to the second invention, if the transmission is switched to the low speed side when the discharge time constant switch is removed, the speed limit becomes low, making it extremely difficult to drive. Furthermore, if the speed limit setting capacitor is short-circuited, the engine will misfire and become unable to run, so there is an advantage that the user can be prevented from canceling the vehicle speed limit without permission.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, Figs. 2 and 3 are voltage waveform diagrams explaining the operation of the same embodiment, and Fig. 4 shows another embodiment of the present invention. Circuit Diagram FIG. 5 is a circuit diagram showing the main parts of still another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Generator coil, 2... Thyristor (ignition operation state changeover switch), 15... Capacitor discharge type ignition device, 31... Capacitor for speed limit setting, 32...
Resistor, 51...Discharge time constant switch, 52...Transmission changeover position detection switch, 53-54...Discharge time constant setting resistor, 56...Switch control circuit.

Claims (1)

[Scope of Claims] 1. In a vehicle speed limiting device that limits the speed of a vehicle driven by an internal combustion engine via a transmission to a set value or less, the device is connected to a part of an ignition device that ignites the internal combustion engine, and an ignition operation state changeover switch that can take a first state that allows the operation of the ignition device and a second state that prevents the operation of the ignition device; a speed limit setting capacitor that is charged to one polarity at the output; a speed limit setting discharge circuit that discharges the capacitor at a constant time constant; The ignition operation state changeover switch is set to the first state and when the terminal voltage of the capacitor is equal to or higher than a predetermined level, the ignition operation state changeover switch is set to the second state to prevent the ignition operation. A switch control circuit that controls an ignition operation state changeover switch and a switch control circuit that detects a switching position of the transmission and when a low speed switching position is detected, reduces a discharging time constant of the capacitor and detects a high speed switching position. 1. A vehicle speed limiting device comprising: a discharge time constant switcher that switches the time constant of the discharge circuit so as to increase the discharge time constant of the capacitor when the discharge time constant of the capacitor increases. 2. In a vehicle speed limiting device that limits the speed of a vehicle driven by an internal combustion engine via a transmission to a set value or less, the device is connected to a part of an ignition device that ignites the internal combustion engine and allows operation of the ignition device. an ignition operation state changeover switch that can take a first state and a second state that prevents the operation of the ignition device; A speed limit setting capacitor and an auxiliary capacitor that are charged, a speed limit setting discharge circuit that discharges the speed limit setting capacitor at a constant time constant, and a speed limit setting discharge circuit that discharges the speed limit setting capacitor at a constant time constant; an auxiliary capacitor discharging circuit that discharges at a large time constant; and the ignition operation when the terminal voltage of the speed limit setting capacitor is less than a predetermined level and the terminal voltage of the auxiliary capacitor is above a predetermined level. The ignition operation is performed when the state changeover switch is set to the first state and the terminal voltage of the speed limit setting capacitor is above a predetermined level, or when the terminal voltage of the auxiliary capacitor is below a predetermined level. a switch control circuit that controls the ignition operation state changeover switch so that the state changeover switch is in the second state; and a switch control circuit that is connected to one end of the speed limit setting capacitor and detects the changeover position of the transmission and sets the switch to the low speed side. When the switching position of the speed limit setting capacitor is detected, the discharge time constant of the speed limit setting capacitor is decreased, and when the high speed switching position is detected, the discharge time constant of the speed limit setting capacitor is increased. a discharge time constant switcher for switching a time constant of a discharge circuit, the auxiliary capacitor is provided so that charging is blocked when the speed limit setting capacitor is short-circuited, and the auxiliary capacitor discharges The time constant of the circuit is set sufficiently large to maintain the terminal voltage of the auxiliary capacitor at or above the predetermined level up to the ignition position of the internal combustion engine even when the internal combustion engine is rotating at low speed, and the discharge circuit for setting the speed limit is a fixed resistor connected in parallel to the speed limit setting capacitor so that the speed limit setting capacitor can be discharged even when the discharge time constant switcher is disconnected from the speed limit setting capacitor; A vehicle speed limiting device, characterized in that the resistance value of the fixed resistor is set to limit the speed of the vehicle to a predetermined speed limit or less when the transmission is switched to the highest speed side.