JPH08509B2 - Vehicle speed limiter - Google Patents

Description

The present invention relates to a pair of left and right rear wheels, a front wheel that is turned by a bar handle, and a compact handleable steering wheel operating means provided on the bar handle. The present invention relates to a vehicle speed limiting device for a three-wheeled vehicle and a four-wheeled vehicle (hereinafter referred to as "small vehicle"), and automatically outputs engine output so that the vehicle speed does not exceed a predetermined set speed in both forward and reverse. It is possible to ensure the safety of driving by controlling to.

[Conventional technology]

In a small-sized vehicle having a manual steering wheel operating means on the steering wheel and capable of switching between forward and backward movement, the hand gripping the steering wheel must operate the throttle operating means as well as the steering operation. When the entire vehicle body leans, such as when traveling in a wasteland, the driver must operate the steering wheel while maintaining that posture with the hand holding the steering wheel, and also operate the throttle operating means. In such a situation, the operation amount of the throttle changes contrary to the operator's intention. This tendency is particularly great in buggy cars and the like with wide tires.

It is not desirable in itself that the throttle operation amount changes as the vehicle body leans, which impairs the smoothness of driving of the vehicle.However, there is a change in the throttle operation amount against the driver's will. , When it is increasing,
Since the vehicle speed suddenly increases suddenly and the vehicle body is tilted, it is extremely dangerous when the vehicle is moving forward, but when driving backward, it is driving backwards, so the posture is originally unstable. , It is even more dangerous because the visibility is poor.

Conventionally, in a vehicle operating under a specific environment or under specific conditions, as a means for ensuring that the vehicle travels within a speed limit, when the vehicle speed exceeds a predetermined speed limit, the engine is forced to stop when the vehicle speed exceeds a predetermined speed limit. It is known to control an ignition device to forcibly stop the engine. Since such a vehicle is a control means for preventing the vehicle speed from exceeding the speed limit, this control device cannot be used for the reverse operation which originally does not exceed the speed limit. Can not avoid the danger of.

If the above-mentioned conventional vehicle speed limiting device is applied to avoid the above danger, the engine suddenly stops while the vehicle is traveling forward in a wasteland in an unstable posture while leaning to the left or right, and the vehicle suddenly moves. It is even more dangerous as it will stop.

Further, since the speed limit for avoiding the danger differs depending on whether the vehicle is moving forward or backward, it is impossible to avoid the danger when traveling backward.

[Problems to be Solved by the Invention]

The present invention automatically controls the engine output by the engine control device so that the vehicle can be safely and smoothly driven within the safe speed for both forward and reverse while avoiding the above dangers. That is the subject.

[Means for solving the problem]

The means of the present invention, which has been taken to solve the above problems, is constituted by the following elements (a) to (c).

(A) A vehicle speed detector, a forward / backward traveling discriminator, a forward traveling limited vehicle speed setting device, a reverse traveling traveling vehicle speed setting device, and a set value of either of the two setting devices based on the determination result of the forward traveling traveling forward traveling discriminating device. And (b) a comparator for comparing the set value of the forward limit vehicle speed setter or the reverse limit vehicle speed setter with the vehicle speed detected by the vehicle speed detector. An ignition timing retarding circuit that operates according to an output signal of the comparator, When comparing the vehicle speed output value from the forward or reverse vehicle speed setting value and the vehicle speed output from the vehicle speed detector by selecting one of the setting values of the engine, when the vehicle speed reaches the above setting value,
Delaying the ignition timing of the engine and reducing the engine output by the output signal of the comparator.

[Action]

Since it has a forward / backward discriminator, a forward speed limit vehicle speed setting device, and a reverse speed limit vehicle speed setting device, a vehicle speed limit value is set for each of forward and reverse speeds, and thereby, the forward vehicle speed and the reverse vehicle speed are each limited to within the safe vehicle speed. be able to. And when moving forward,
Depending on the reverse speed, the vehicle speed set value for forward or reverse is selected by the solenoid changeover switch which is the set vehicle speed selection means, and this is compared with the vehicle speed of the vehicle speed detector by one comparator, and the vehicle speed reaches the above set value. At this time, the output signal of the comparator delays the ignition timing of the engine and controls its output control device to reduce the output of the engine so that the vehicle speed does not exceed a predetermined set speed. Since the control from the vehicle speed set value selection to the engine output control device can be controlled by the same control device for both forward and reverse movements, the control device can be extremely simplified. Further, since the existing ignition timing retarding circuit can be used as the engine output control device which is a part of the vehicle speed limit control device, the control device can be further simplified.

The vehicle speed limit control device operates to reduce the engine output to prevent the vehicle speed from exceeding the set speed, and when the vehicle speed decreases, the ignition timing by the ignition timing retarding circuit is restored again.
Therefore, the engine output does not suddenly decrease, and the engine output is smoothly restored, so that the vehicle travels smoothly while the control device is operating.

〔Example〕

This small vehicle has a pair of left and right front wheels equipped with wide tires.
10 and a pair of left and right rear wheels 12 equipped with wide tires, which is operated by a bar handle 16, and has a fuel tank 18 and a seat 20 behind the bar handle 16.
It is intended to board the vehicle while straddling the seat 20 and run while controlling the engine by the throttle grip of the bar handle 16.

A vehicle speed detector 22 is provided on either the left or right front wheel 10. The vehicle speed detector 22 includes a magnet disk 24 that rotates integrally with the front wheels, and a coil 26 that is arranged so as to face the magnet disk 24.
Coil 26 and Coil 28 have their outputs 90 to each other.
They are arranged so as to be out of phase with each other and are connected to the waveform shaping circuits 30 and 32, respectively.

The waveform shaping circuit 30 is connected to the D / A converter 52, and the waveform shaping circuit 32 is connected to the D-type flip-flop (hereinafter referred to as “FF”) of the forward / reverse discriminator 34. This forward / reverse discriminator 34
Is provided with three FFs 36, 38, 40, AND circuits 42, 44, a counter 46, and a clock 48. The output waveform is as shown in FIG.

The outputs of the coils 26 and 28 are made into rectangular waves by the waveform shaping circuits 30 and 32 and input to the FFs 36 and 40. The Q output of FF36 is input to FF38. Since the FF38 reads the Q output of the FF36 in synchronization with the clock pulse CL of the clock 48, as shown in FIG.
The rising edge of the Q output waveform of FF36 is advanced by one pulse of the clock pulse CL with respect to the falling edge of the Q output waveform of FF38. Therefore, the Q output of FF36, FF38 and FF40
The AND circuit 42 for inputting the Q output of outputs a pulse only when moving forward and does not output this pulse when moving backward. The output of the AND circuit 42 is input to the reset input terminal of the counter 46. The clock pulse CL of the clock 48 is input to the counter 46 via the AND circuit 44, and the counter 46 counts the clock pulse CL. This counter 46
The overflow signal x is input to the inverting input terminal of the AND circuit 44.

Therefore, the counter 46 is periodically reset by the output pulse of the AND circuit 42 during forward movement, so the counter 46
Does not overflow, and the overflow signal x is kept at "L" level. The counter 46 is not reset because the output pulse of the AND circuit 42 disappears when the vehicle moves backward. For this reason, after a predetermined time,
The counter 46 overflows and the overflow signal x changes to the "X" level.

The speed limiting means 50 includes a D / A converter 52 that converts the output of the waveform shaping circuit 30 into an analog voltage corresponding to the vehicle speed, and vehicle speeds when moving forward and backward (for example, 70 km / h when moving forward and 10 km / h when moving backward). Set resistor 54, resistor 56, comparator 58, and delay circuit
It is provided with 60 and a solenoid 62.

The solenoid 62 serves as a selection means for selecting one of the set vehicle speeds based on the determination result of the forward / reverse discriminator 34. That is, the solenoid 62 is provided with the resistor 56 when the overflow signal x of the counter 46 is being output.
The set vehicle speed for reverse travel set in step 1 and the set vehicle speed for forward travel set by the resistor 54 are input to the comparator 58 when the overflow signal x is not output. Therefore, when the vehicle speed reaches the set vehicle speed corresponding to forward and reverse, the comparator 58 sends an "H" level signal to the retarding circuit 60, and the retarding circuit 60 retards the ignition timing of the spark plug 64.

As the ignition circuit, for example, a CDI type circuit can be used. The Framag charging coil 66 charges a capacitor 68 to the polarity shown, which capacitor 68 is fired based on the pulse of the pulser coil 70 and a thyristor 72 and an ignition coil 74.
Is discharged via the primary side of the. At this time, ignition coil 74
A high voltage is induced on the secondary side of the spark plug 64 to ignite the spark plug 64.
The retarding circuit 60 is interposed between the pulser coil 70 and the gate of the thyristor 72, and ignites the spark plug 64 at a regular ignition timing when the output of the comparator 58 is at "L" level. Further, when the "H" level is reached, the ignition timing is delayed, so the engine output is reduced and the vehicle speed is limited.

In another embodiment shown in FIG. 4, the forward / backward traveling discriminator 34A is constituted by a switch for discriminating the forward / backward traveling from the operation of the forward / backward traveling switching lever 80. That is, when moving forward, the discriminator 34A inputs the set vehicle speed at the time of forward determined by the resistor 54 to the comparator 58, and inputs the set vehicle speed at the time of reverse determined by the resistor 56 to the comparator 58 during reverse. ,
Operate the solenoid 62. In this figure, the second
Since the same parts as those in the figure are designated by the same reference numerals, the description thereof is omitted.

In each of the above embodiments, the vehicle speed is detected by the magnet disk 24 and the coil 26, but the present invention is not limited to this, and may be obtained from, for example, the engine rotation speed and the reduction ratio, or from the rotation angle of the display needle of the speedometer. You may Note that reference numeral 14
Is the engine.

〔effect〕

As described above, the present invention is premised on a small vehicle that can be switched between forward and backward, having a pair of left and right rear wheels, a front wheel that is turned by a bar handle, and a manual throttle operating means on the bar handle. What solved the problem is not yet known. Therefore, when the vehicle is traveling forward in a wasteland by solving the above-mentioned problems, in any case of traveling backward, the vehicle is tilted, while eliminating the above-mentioned danger accompanying traveling in an unstable posture, It is an effect peculiar to the present invention that the vehicle can be driven safely and smoothly.

For forward traveling and backward traveling, the vehicle speed control device for forward traveling and the vehicle speed control device for backward traveling are almost common in controlling the engine output so that the vehicle can travel safely within the optimum speed limits. Since it is possible to use the existing ignition timing retarding circuit as the engine output control device, it is a great advantage of the present invention that the entire mechanism of the vehicle speed control device can be simplified.

[Brief description of drawings]

FIG. 1 is a side view of a small four-wheeled vehicle according to an embodiment of the present invention, FIG. 2 is a first embodiment of a speed limiting device for a small four-wheeled vehicle of FIG. 1, and FIG. FIG. 4 is an output waveform diagram of each part of the advance discriminator, and FIG. 4 shows another embodiment of the speed limiting device. 16 …… Bar handle 22 …… Vehicle speed detector 34, 34A …… Forward / reverse discriminator 50 …… Speed limiter

Claims (1)

[Claims] 1. A vehicle speed limiter for a small vehicle, which has a pair of left and right rear wheels, front wheels that are turned by a bar handle, and manual throttle operating means on the bar handle, and is capable of switching between forward and backward movements. A forward / reverse discriminator, a forward limit vehicle speed setter, a reverse limit vehicle speed setter, and a solenoid changeover switch for selecting a set value of either of the setters based on the determination result of the forward / reverse discriminator. Set vehicle speed selecting means, a comparator for comparing the set value of the forward speed limit vehicle speed setter or the reverse speed limit vehicle speed setter with the vehicle speed detected by the vehicle speed detector, and an ignition timing delay operated by the output signal of the comparator. And a forward / backward discriminator discriminating signal to select either the set value of the forward limit vehicle speed setter or the reverse limit vehicle speed setter by the set vehicle speed selecting means. The vehicle speed set value for forward or reverse is compared with the vehicle speed output from the vehicle speed detector by a comparator, and when the vehicle speed reaches the above set value, the output signal of the comparator delays the ignition timing of the engine, Vehicle speed limiter that reduces engine output.