JPH02219402A - Alarm for motor vehicle - Google Patents

Abstract

PURPOSE:To detect rotation of a motor and to facilitate incorporation of an alarm signal generating circuit into a device by producing an alarm control signal for operating an alarm section based on detection of ripple of battery voltage. CONSTITUTION:An alarm section 21 to be operated through a battery 11 for feeding current to a drive motor 17 and generating an alarm upon reception of an alarm control signal is provided. Furthermore, a means 1 for detecting ripple of battery 11 voltage and generating a detection pulse, and a means 2 for integrating the detection pulse and producing a smoothed output are provided. Moreover, a means 3 for detecting the output from the integrating means 2 which exceeds a reference value and generating an alarm control signal is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a warning device for an electric vehicle, and more particularly to a warning device for an electric vehicle for warning the surroundings of the running or approach of an electric vehicle, etc. It is something.

[Conventional technology]

Conventional examples are shown in FIGS. 3 and 4. Of these, FIG. 3 is a block diagram showing the schematic configuration of the electric vehicle and the connection of the alarm device thereto.

In FIG. 3, when the main switch 12 is turned on, the battery 11 supplies power to each part of the electric vehicle and also supplies power for ignition to the engine (not shown) to put it into operation. It is also used to start the engine.

The stabilized power supply section 13 is supplied with power from the battery 11, outputs a constant voltage VCC, and supplies this to each section. When the accelerator 14 that controls the running of the electric vehicle is operated, it generates an accelerator voltage of a magnitude corresponding to the degree of opening of the accelerator 14 . The energization control circuit section 15 operates according to the accelerator voltage.
The current supplied from the battery 11 to the motor drive unit 16 is controlled. The motor 17 generates rotational force in response to the current supplied from the motor drive unit 16, thereby driving the electric vehicle.

Further, the alarm synthesis section 18 generates an alarm signal when grounded by operating the alarm switch 19. The alarm signal may be a simple audible signal or a synthetic voice signal. The speaker amplifier 20 amplifies and outputs the alarm signal generated by the alarm synthesizer 18 in response to the operation of the alarm switch 19. The speaker 22 emits an alarm signal as sound based on the output signal of the speaker amplifier 20, and generates an alarm. Alarm synthesis unit 18. The speaker amplifier 20 constitutes an alarm section 21, and the speaker 22 constitutes an alarm generating section.

Control (on or off) of the alarm unit 21 in the electric vehicle shown in FIG. 3 has conventionally been performed based on various alarm generation factors as shown in (A) and (B) below.

(A), manual operation (B), @dynamic operation ■ Accelerator voltage on detection ■ Main switch interlocking ■ Motor rotation pulse detection ■ Current detection ■ Others (seat switch, etc.) Here, in the case of manual operation shown in (A) for,
For example, by manually operating the alarm switch 19, the alarm unit 2
1 to the operating state and generates an alarm.

In addition, in the case of automatic mode indicated by CB), when any of the various factors shown in Generates an alarm.

In addition, Fig. 4 shows a conventional alarm control signal generation circuit (above ((a)).
B) In the case of ■) - An example is shown.

In FIG. 4, reference numeral 31 denotes a rotational pulse generator, which is coupled to the motor 17 and generates a number of pulses per unit time that varies depending on the rotational speed of the motor 17. The differentiating circuit 32 consisting of a capacitor C1 and a resistor R1 is
The pulses generated by the rotational pulse generator 31 are differentiated to generate differential pulses. The amplifier 33 has an operational amplifier ICI, and amplifies the pulse generated by the differentiating circuit 32 to generate an output pulse. An integrating circuit 34 consisting of a resistor R2 and a capacitor C2 integrates the output pulse of the amplifier 33. Comparator 3
5 has an operational amplifier IC2, which generates an output when the integrated output voltage of the integrating circuit 34 exceeds a certain dark value, turns on the transistor 36, and grounds the alarm section 21. As a result, an alarm control signal is given, and the alarm section 21 generates an alarm signal.

[Problem to be solved by the invention]

Among the above-mentioned (A) and CB) various alarm factors, each of the factors in the case of automatically generating an alarm shown in (B) has the following problems.

The method using accelerator voltage on detection shown in (3) is the simplest method, but when attempting to retrofit a warning device, it is necessary to branch the accelerator voltage, which poses the problem of requiring modification of the electric vehicle. be.

In the main switch interlocking method shown in (2), an alarm is always generated when the main switch is on, that is, when the electric vehicle is in operation, resulting in an unknown alarm.

The method using motor rotation pulse detection shown in (2) requires the acquisition of motor rotation pulses, and it is necessary to newly provide a circuit section for this as illustrated in the fourth example.

The method using current detection (for example, -1:, -low current) shown in (2) requires an additional circuit for current detection.

The method using a seat switch shown in (2) requires a new switch (seat switch) for detecting the seating of a passenger in the seat of the electric vehicle, which is expensive.

[Purpose of the invention]

The present invention aims to solve the problems of the prior art, and includes detecting an increase in the ripple of the battery discharge current when the motor rotates in an alarm unit, forming an alarm control signal, and utilizing this. To provide an electric vehicle warning system that can be easily and inexpensively installed even when retrofitted,
That is the purpose.

[Means to solve the problem]

The present invention includes an alarm section that uses a drive motor battery as a power source and that starts up and issues an alarm when receiving an alarm control signal. Further, ripple detection means detects a ripple in the output voltage of the battery and generates a detection pulse;
Integrating means that integrates the detection pulse of this ripple detecting means to generate a smoothed output; and an alarm control that detects when the output of this integrating means exceeds a certain reference value and generates an alarm control signal. The configuration includes a signal generating means. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The embodiment shown in FIG. 1 is operated by a battery 11 that supplies current to a drive motor 17, and an alarm section 2 that starts up and generates an alarm when receiving an alarm control signal.
1. It also includes ripple detection means 1 that detects ripples in the voltage of the battery 11 and generates detection pulses, and integration means 2 that integrates the detection pulses of the ripple detection means 1 and generates a smoothed output. ing. Furthermore, it is provided with an alarm control signal generating means 3 which detects when the output of the integrating means 2 exceeds a certain reference value and generates an alarm control signal.

To explain this in more detail, the ripple detection means 1 inputs a voltage divider 24 that divides the output voltage of the battery 11 and a part of the voltage divided by the voltage divider 24, and amplifies the ripple portion of the battery voltage. amplifier 25 and this amplifier 2
The differential circuit 26 forms a pulse signal based on the output signal of 5.

Here, the voltage divider 24 consists of resistors R3 and R4, and when the main switch 12 is on, divides the battery voltage into a
Generates a detection signal at the point. Further, the amplifier 25 has an operational amplifier IC3 and amplifies the signal at point a, but the operational amplifier I
Since the other input of C3 is given a constant voltage V, which is slightly smaller than the signal at point a, the amplifier 2 at point b
In the output signal of 5, the ripple in the battery voltage appears magnified. Further, the differentiating circuit 26 includes a capacitor C3 and a resistor R5, and differentiates the signal at point b to obtain C
It is designed to generate a signal consisting of a differential pulse at a point.

Further, the integrating means 2 includes a detecting circuit 27 that detects the output signal (signal at point C) of the ripple detecting means 1 described above, and an integrating circuit 2 that smoothes the signal output from the detecting circuit 27.
8.

The signal at point C is rectified by a diode D in the detection circuit 27 and smoothed by a capacitor C4.

As a result, a signal consisting of a pulsating flow is generated at point d. Further, the integrating circuit 28 includes a resistor R6 and a capacitor C5, and integrates the signal at point d to generate a smoothed signal at point e.

Further, the alarm control signal generating means 3 includes a comparator 29 which manually compares the signal at point e (signal e in FIG. 2) sent from the integrating means 2 with a constant reference voltage v, and this A transistor 30 is activated by the output of the comparator 29 and outputs a predetermined alarm control signal to the alarm section 21.

Here, the comparator 29 includes an operational amplifier IC4, and generates an output signal at point f when the signal at point e exceeds a certain reference voltage v. Further, the transistor 30 is turned on when an output signal is generated at one point, and provides an alarm control signal by grounding the alarm section 21.

When the alarm section 21 receives an alarm control signal from the transistor 30, it generates an output and drives the speaker 22. As a result, the alarm signal generated by the alarm section 21 is sent out from the speaker 22 as an acoustic signal.

The other configurations are the same as the conventional example shown in FIG. 3 described above.

In this way, in this embodiment, the brushes of the motor 17 and the commutator can be "connected" or "disconnected" not only when the motor 17 is being driven by switching, but also when the accelerator is fully open and fully conductive. This causes pulsation in the motor current, and this pulsation causes pulsations (ripples) in the terminal voltage of the battery 11 as shown in FIG. 2a.

In the circuit shown in FIG. 1, the ripple component is amplified from the battery voltage by the amplifier 25, and then the ripple voltage is extracted.
By smoothing its output and comparing it to a reference voltage,
The rotation of the motor 17 is detected.

When the motor 17 is not driven by switching, the battery voltage ripple is at the lowest level, but by setting the gain of the amplifier 25 so that an alarm control signal can be generated in this state, it is possible to An alarm can be issued when the vehicle is running.

In this case, the signal e is transmitted to the smoothing circuit 28 with a large time constant.
Since it is smoothed through
Lasts for O. Therefore, even if the electric vehicle is temporarily stopped, the alarm will not be interrupted.

In addition, there are other causes of ripples in the battery voltage, other than the rotation of the motor 17, such as a reference oscillator (not shown) in the control section of the electric vehicle body, but these are usually at a sufficiently low level, so This influence can be removed by appropriately setting the reference voltage v of the comparator 28.

〔Effect of the invention〕

As explained above, according to the present invention, since the alarm control signal for operating the alarm unit is output by detecting the ripple in the battery voltage, the rotation of the motor is detected and the operation signal for the alarm unit is output. The alarm control signal generation circuit can be easily incorporated into the device, and by providing a stabilized power supply for the alarm control signal generation circuit in the alarm device, the connection line to the alarm device can be connected to the battery. Only two connecting wires are required, which makes installation of the alarm device the easiest.In addition, the time constant of the ripple detection voltage smoothing circuit in the alarm control signal generation circuit can be increased to a certain extent (if the time constant of the ripple detection voltage smoothing circuit is It is possible to provide an unprecedented and excellent warning device for an electric vehicle that can effectively prevent interruptions in the warning that occur when the vehicle is temporarily stopped.

Figure 2

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing signals at each part a to f in the circuit of FIG. 1, and FIGS. 3 and 4 each show a conventional example. It is a diagram. DESCRIPTION OF SYMBOLS 1... Ripple detection means, 2... Integrating means, 3... Alarm control signal generation means, 11...
...Battery, 13...Stabilized power supply section, 1
6...Motor drive unit, 17...Motor, 21...Alarm unit.

Claims (1)

[Claims] (1) A ripple detection device that uses a drive motor battery as a power source and has an alarm unit that starts and issues an alarm when receiving an alarm control signal, and that detects ripples in the output voltage of the battery and generates a detection pulse. and an integrating means that integrates the detection pulse of the ripple detecting means to generate a smoothed output, and detects when the output of the integrating means exceeds a certain reference value and issues the alarm. An alarm device for an electric vehicle, comprising an alarm control signal generating means for generating a control signal.