JPH11245722A - Alarm system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To aurally alarm a vehicular traveling situation to a driver, a pedestrian or the like for safety operation of a vehicle, in the vehicle provided with a motor for vehicle traveling and a key switch for switching its electric power circuit. SOLUTION: This alarm system is provided with a vehicular speed detecting means 8, means 6a, 9, 11 for generating alarm sounds toward the outside of a vehicle when a key switch 3 is turned on and when the vehicle is in a traveling condition, and means 6b, 9, 11 for generating alarm sounds to a driver's cab when the key switch is turned on and when the vehicle is in the traveling condition. Each of the alarm sound generating means 6a, 6b, 9, 11 has a function to generate an alarm sound of a reference frequency when the key switch 3 is turned on and when the vehicle is not in a traveling condition, and to generate an alarm sound of a frequency changed to raise the reference frequency in response to a vehicular speed-detected signal when the key switch 3 is turned on and when the vehicle is in a traveling condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an alarm device for a vehicle.

[0002]

2. Description of the Related Art Conventionally, there is a hybrid electric vehicle in which an engine and an electric motor are combined to improve exhaust emission.

[0003] Such a hybrid electric vehicle is provided with a generator driven by an engine and a battery for storing the generated power, and the vehicle is driven by driving an electric motor using these as a power source.

[0004]

A vehicle equipped with such an electric motor (including an electric vehicle) runs on the power of the electric motor, so that the sound is quieter than that of a vehicle driven by an engine. Therefore, it is difficult for a pedestrian or the like to notice the approach of the vehicle. In addition, the driver can visually grasp the driving situation from the flow of the scenery and the display of the speedometer, but since there is little auditory information such as the running sound, it may be possible that the sense that the vehicle is running may be weakened somewhat. . Some electric vehicles are provided with an alarm lamp that is activated when the pressure in the negative pressure tank of the brake system is abnormal (see Japanese Utility Model Application Laid-Open No. 5-95102).

An object of the present invention is to provide an effective countermeasure for solving such a problem.

[0006]

According to a first aspect of the present invention, in a vehicle provided with a motor for driving a vehicle and a key switch for opening and closing a power supply circuit thereof, a means for detecting a vehicle speed, a key switch signal of the vehicle and a control signal of the vehicle speed. Means for generating an alarm sound to the outside of the vehicle when the key switch is on and the vehicle is in a running state based on the detection signal.

According to a second aspect of the present invention, there is provided an electric motor for driving a vehicle,
In a vehicle provided with a key switch for opening and closing the power supply circuit, means for detecting the vehicle speed, and an alarm sound to the driver's cab when the key switch is on and the vehicle is in a running state based on the key switch signal of the vehicle and the detection signal of the vehicle speed. And means for generating

In a third aspect, the alarm sound generating means in the first or second aspect has a function of increasing the frequency of the alarm sound in accordance with a vehicle speed detection signal.

In a fourth aspect of the present invention, the alarm sound generating means according to the first or second aspect of the present invention is configured such that when the key switch is turned on and the vehicle is not running, the alarm sound of the reference frequency is generated.
When the key switch is on and the vehicle is in a running state, a function is provided for generating an alarm sound of a frequency changed so as to increase its reference frequency in accordance with a vehicle speed detection signal.

[0010]

According to the first aspect of the present invention, when the key switch is turned on and the vehicle is running, an alarm sound is generated outside the vehicle. Therefore, the approach of the vehicle can be audibly notified to a pedestrian or the like.

In the second invention, when the key switch is turned on and the vehicle is running, an alarm sound is generated in the driver's cab, so that the driver can be provided with auditory information that the vehicle is running.

According to the third aspect of the present invention, since the frequency of the alarm sound increases in accordance with the vehicle speed, the traveling speed (vehicle speed) of the vehicle can be notified by its sound quality.

In the fourth aspect, the traveling speed (vehicle speed) of the vehicle
In addition, when the key switch is turned on and the vehicle is not running, an alarm sound at the reference frequency is generated. By operating the accelerator, it is possible to give an audible notification of the vehicle's stopped state (equivalent to the idling of an engine-driven vehicle). it can.

[0014]

FIG. 1 shows an embodiment of a hybrid electric vehicle (bus). An electric motor 1 for driving a vehicle is mounted on a rear portion of a vehicle body, and a key switch 3 of a cab 2 is turned on. When the accelerator is operated, it is driven by a battery or a generator (not shown) as a power supply via an inverter,
Generates power for running the vehicle. This power is output to the propeller shaft 4 via the reduction gear, and transmitted from the differential to the right and left rear wheels 5 (drive wheels).

The bus is provided with two speakers 6a and 6b (sound generators). One is disposed in front of the vehicle body 10 toward the front, and the other is disposed on the ceiling of the cab 2 toward the driver's seat 7. In order to control these speakers 6a and 6b, a vehicle speed sensor 8 for generating a pulse signal (detection signal) having a frequency corresponding to the rotation speed of the propeller shaft 4 (corresponding to the vehicle speed), a modulator 9 and an amplifier 11 Is provided.

The modulator 9 outputs an audio signal to be transmitted to the amplifier 11, and generates an audio signal (sine wave output) having a frequency corresponding to the pulse frequency of the vehicle speed sensor 8. The amplifier 11 increases the amplitude of the audio signal of the modulator 9 as a drive signal to each of the speakers 6a and 6b to a predetermined amplification degree when the key switch 3 of the cab 2 is turned on.

With such a configuration, when the key switch 3 of the driver's cab 2 is turned on and the vehicle is running, the speaker 6a on the front of the vehicle body and the speaker 6b of the driver's cab output an alarm sound. Therefore, a pedestrian or the like can easily notice the approach of the vehicle by the alarm sounds of the speakers 6a and 6b. In addition, the driver can also obtain the audible information that the vehicle is running by the warning sounds of the speakers 6a and 6b. Since the frequency of the alarm sound increases according to the vehicle speed as shown in FIG. 2, the traveling speed (vehicle speed) of the vehicle can be known from the sound quality.

In order to further enhance the safe operation of the vehicle, the modulator 9 oscillates the reference frequency as an audio signal (sine wave output) to the amplifier 11 and changes the frequency of the sine wave according to the vehicle speed. Give the function to let.
Thereby, as shown in FIG. 3, from each speaker 6a, 6b,
When the key switch 3 is turned on, an alarm sound of a reference frequency is generated when the vehicle is not in a running state, and an alarm sound of a frequency obtained by adding an increment of a frequency corresponding to the vehicle speed to the reference frequency is generated when the vehicle is in a running state. I do.

Therefore, in addition to the traveling speed (vehicle speed) of the vehicle, a stopped state (corresponding to an idling operation of the engine-driven vehicle) in which the vehicle can travel when the accelerator is operated can be notified by the sound quality of the alarm sound. As for the speakers 6a and 6b, a hole may be formed in the floor panel of the driver's cab 2 so that the speaker 6b on the driver's cab 2 side may be omitted so that the warning sound of the speaker 6a can be heard in the driver's seat 7. The vehicle speed sensor 8 can be replaced with a tire rotation sensor of an anti-lock brake system.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an embodiment of the present invention.

FIG. 2 is an output characteristic diagram of the speaker.

FIG. 3 is an output characteristic diagram of a speaker explaining another embodiment.

[Explanation of symbols]

 Reference Signs List 1 motor 2 cab 3 key switch 4 propeller shaft 6a, 6b speaker 8 vehicle speed sensor 9 modulator 11 amplifier

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B60Q 5/00 680 B60Q 5/00 680A (72) Inventor Shigenori Kinoshita 1-1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Inside the corporation

Claims (4)

[Claims] In a vehicle provided with a motor for driving a vehicle and a key switch for opening and closing a power supply circuit thereof, means for detecting a vehicle speed, and a key switch being turned on based on a key switch signal of the vehicle and a detection signal of the vehicle speed. Means for generating an alarm sound to the outside of the vehicle when the vehicle is in a running state. 2. A vehicle equipped with a motor for driving a vehicle and a key switch for opening and closing a power supply circuit thereof, wherein a means for detecting a vehicle speed, and a key switch is turned on based on a key switch signal of the vehicle and a detection signal of the vehicle speed. Means for generating an alarm sound to the driver's cab when the vehicle is in a running state. 3. The alarm device according to claim 1, wherein the alarm sound generating means has a function of increasing the frequency of the alarm sound in accordance with a vehicle speed detection signal. 4. A warning sound generating means for generating a warning sound of a reference frequency when the key switch is on and the vehicle is not in a running state.
2. The vehicle according to claim 1, further comprising a function of generating an alarm sound at a frequency changed so that a reference frequency thereof is increased according to a vehicle speed detection signal when the key switch is turned on and the vehicle is running. 3. The alarm device according to 2.