JPS61278431A - Vehicle equiped with stepless transmission - Google Patents

Abstract

PURPOSE:To allow a driver to be positively informed of the condition of acceleration or deceleration even when a vehicle equiped with a stepless transmission is being accelerated or decelerated under a constant engine speed by providing a means which produces audible sounds proportional to the vehicle speed. CONSTITUTION:A voltage signal proportional to a vehicle speed V is outputted by a transformer 1. A frequency signal proportional to the output from the transformer 1 is outputted by a V-F converter 2. And a voltage signal proportional to an accelerator opening theta is outputted by a transformer 3. The frequency signal outputted from the V-F converter 2 is amplified by an amplifier 4, and this amplification (gain) is automatically adjusted so as to be proportional to the voltage signal outputted from the transformer 3. A speaker 5 is arranged in a cabin and outputs signals from the amplifier 4 as audible sounds. This configuration enables the frequency proportional to the speed to be produced as audible sounds, and furthermore enables audible sounds having sound pressure proportional to either the accelerator opening or the engine speed to be produced. Accordingly, this can inform a driver positively of the condition of acceleration or deceleration.

Description

[Detailed description of the invention] [Industrial application field]

The present invention applies pA to a vehicle with a continuously variable transmission.

[Conventional technology]

A vehicle with a continuously variable transmission mainly controls the engine speed according to the amount of accelerator pedal depression, and obtains the necessary driving force for the engine speed by automatically adjusting the gear ratio using a belt converter or the like. Figure 2 shows the speed change characteristics of this type of vehicle. After clutch me 1-, it first accelerates in low gear (1st gear), then 2nd gear, 3rd gear, and top gear (4th gear) as in vehicles with manual transmission. ) to shift line according to accelerator opening ■, ■, ■
. Shift to high speed according to ■.

[Problems to be solved by the invention]

In a vehicle equipped with a continuously variable transmission, there is a region where the engine speed is constant and the vehicle speed increases or decreases depending on the gear ratio. For this reason, even though the accelerator is kept constant due to changes in the required driving force, acceleration or deceleration may occur, giving the driver a strange feeling that the engine rotation sound is constant and the vehicle speed increases or decreases. , there was a problem that gave a bad impression on acceleration performance. In this regard, conventional manual transmissions (4 vehicles (M "cars")
In vehicles with automatic transmissions (A-r vehicles), engine rotation noise and vehicle speed are proportional.

[Means and effects for solving the problems] In view of the above-mentioned problems, the present invention includes means for generating an audible sound with a frequency proportional to the vehicle speed, and the audible sound detects an increase or decrease in the vehicle speed at a constant engine speed. The idea was to make it possible for the driver to recognize it by correlating it with increases and decreases in frequency. Further, the present invention includes means for generating an audible sound with a frequency proportional to the vehicle speed and a level proportional to the amount of accelerator depression or the engine rotational speed, and the frequency of the audible sound is such that the increase or decrease in the vehicle speed at a constant engine rotational speed can be detected. This allows the driver to recognize increases and decreases, and also correlates the level (sound pressure) of the engine speed or accelerator pedal depression with the audible sound level (sound pressure).

【Example】

FIG. 1 is a circuit diagram of an embodiment of the present invention. Voltage converter 1 obtains a voltage signal proportional to vehicle speed V. The V-F converter 2 obtains a frequency signal proportional to the voltage signal output from the voltage converter 1. Voltage conversion 'a3 obtains a voltage signal proportional to accelerator opening degree θ. The amplifier 4 amplifies the frequency signal that becomes the output of the V-F converter 2, and this amplification degree (
The gain) is automatically adjusted in proportion to the voltage signal output from the voltage converter 3. A speaker 5 is provided in the vehicle interior and outputs the output signal of the amplifier 4 as an audible sound. In such a configuration, voltage converter 1 and V-F converter 2
is a signal generator that generates a signal with a frequency proportional to the skewer'av, and the voltage converter 3 is a signal generator that generates a signal that is proportional to the accelerator opening θ.The audible sound generated from the speaker 5 is based on the vehicle speed. The frequency increases or decreases in response to the increase or decrease in the accelerator pedal position, but the sound pressure changes in height in response to the accelerator opening. Therefore, during a gear change operation in which the vehicle speed increases or decreases when the engine speed is constant, the audible sound from the speaker 5 is generated as a pseudo base of the engine speed, thereby informing the driver of the acceleration/deceleration state. In the embodiment, it is of course possible to obtain the same effect by using the engine rotational speed signal instead of the accelerator opening degree θ. Further, it is also possible to provide a feeling of acceleration and deceleration by using only audible sounds with a frequency proportional to the vehicle speed and keeping the sound pressure constant. Further, in the embodiment, a speaker whose tone color changes may be used instead of the speaker 5.

【Effect of the invention】

As described above, according to the present invention, an audible sound with a frequency proportional to the heavy speed and a sound pressure proportional to the accelerator opening degree or the engine rotation speed is generated. Even if the driving state is in a constant acceleration/deceleration range, the driver can be reliably informed of the acceleration/deceleration state.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a shift characteristic diagram of a vehicle equipped with a continuously variable transmission. 1.3... Voltage converter, 2... V-F converter, 4
...Amplifier, 5...Speaker, ■...Vehicle speed detection signal, θ...Accelerator opening detection signal. Patent applicant Fuji Heavy Industries Co., Ltd. Agent Patent attorney Atsushi Kobashi 161 Ben I! 4! Shimura Ben
Shinche CQ rice 2g! Toru Cdo/)l)

Claims (2)

[Claims] (1) A vehicle with a continuously variable transmission characterized by comprising a vehicle speed signal and an electro-sound converter that generates an audible sound at a frequency corresponding to the frequency of the output signal. (2) A first signal generator that generates a vehicle speed signal, and a second signal generator that generates a vehicle accelerator depression amount or engine rotation speed signal.
a signal generator; and an electro-sound converter for generating an audible sound at a frequency corresponding to the frequency of the output signal of the first signal generator and a sound pressure corresponding to the output signal of the second signal generator. A vehicle with a continuously variable transmission characterized by being equipped with a device.