Electric mobility

Abstract

To provide an electric mobility that can reduce noise of a cooling fan even when the cooling fan for a passenger car is adopted.SOLUTION: An electric mobility 1 includes: a body 7 at least a part of which is formed of a resin skeleton; an air-cooling fan 6 which cools a condenser of an indoor air conditioning air conditioner; and a conducting wire selection section 5 which makes a resonance frequency of the body 7 different from a rotation primary frequency of the air-cooling fan 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to electric mobility. [Background technology]

[0002] Patent document 1 describes a technology that reduces noise and vibrations caused by the cooling fan by controlling the rotation speed of the cooling fan of the air conditioner based on preset low rotation conditions when at least one of the vehicle's operating state and the air conditioner's operating state meets a predetermined condition. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-56345 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a cooling fan for a passenger car is used in a compact mobility, the cooling fan for a passenger car will have excessive performance compared to the compact mobility, and when a plastic body is used in the compact mobility, the natural frequency of the plastic body will shift to a lower frequency than that of a passenger car, resulting in a shift in the resonant frequency, leaving room for improvement.

[0005] The present disclosure has been made in consideration of the above, and aims to provide an electric mobility that can reduce the noise of a cooling fan even when a cooling fan for a passenger car is used. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the objectives, the electric mobility of the present disclosure is an electric mobility comprising a body at least partially made of a resin skeleton, an interior air conditioning air conditioner that conditions the interior of the body, and an air-cooling fan that cools the condenser of the interior air conditioning air conditioner, and is equipped with a rotation speed control device that makes the resonant frequency of the body different from the primary rotation frequency of the air-cooling fan. [Effects of the Invention]

[0007] According to the present disclosure, even when a cooling fan for a passenger vehicle is employed, it is possible to achieve the effect of reducing the noise of the cooling fan. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing the functional configuration of an electric mobility according to an embodiment. [Figure 2] FIG. 2 is a diagram showing frequency characteristics of sounds inside a vehicle cabin. [Figure 3] FIG. 3 is a diagram illustrating the relationship between the peak level of the primary rotation of the air-cooling fan provided in the electric mobility according to one embodiment and the amount of protrusion. [Figure 4] FIG. 4 is a diagram illustrating the relationship between the sound in the vehicle interior and the frequency of the electric mobility according to one embodiment. [Figure 5] FIG. 5 is a diagram illustrating the relationship between the noise level and frequency of the sound inside the vehicle cabin when the conductor selection unit included in the electric mobility according to one embodiment selects the low rotation mode for the air-cooling fan. [Figure 6] FIG. 6 is a block diagram showing a functional configuration of an electric mobility according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Electric mobility according to embodiments of the present disclosure will be described below with reference to the drawings. Note that the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical. Furthermore, the drawings referred to in the following description merely show a schematic representation of the shape, size, and positional relationship to the extent that the contents of the present disclosure can be understood. In other words, the present disclosure is not limited to the shape, size, and positional relationship illustrated in each drawing.

[0010] [Electric mobility configuration] Fig. 1 is a block diagram showing the functional configuration of an electric mobility device according to one embodiment. The electric mobility device 1 shown in Fig. 1 includes a power source 2, a vehicle state detector 3, an interface 4, a conductor selection unit 5, a cooling fan 6, and a body 7.

[0011] The power source 2 supplies power to each component of the electric mobility 1 and to the conductor selection unit 5 via the interface 4 .

[0012] The vehicle state detector 3 detects the state of the electric mobility 1 and outputs this detection result to the interface 4. Specifically, the vehicle state detector 3 detects the current driving mode of the electric mobility 1, for example, the P range, and outputs this detection result to the interface 4. The vehicle state detector 3 also detects a vehicle speed pulse or the like that indicates the current vehicle speed of the electric mobility 1 and outputs this detection result to the interface 4.

[0013] The interface 4 outputs the power input from the power supply to the conductor selection unit 5. The interface 4 also outputs the detection result input from the vehicle state detector 3 to the conductor selection unit 5.

[0014] The conductor selection unit 5 is electrically connected to the air-cooling fan 6 via a plurality of cables. Based on the detection result of the vehicle state detector 3 input via the interface 4, the conductor selection unit 5 selects the cooling fan low rotation mode when the electric mobility 1 is stopped, and outputs the power input from the interface 4 via the low rotation speed cable to the air-cooling fan 6. Specifically, based on the detection result of the vehicle state detector 3, when the electric mobility 1 is in a driving state, the conductor selection unit 5 outputs the power input from the interface 4 to the air-cooling fan 6 via the cable with a rated rotation speed, thereby rotating the air-cooling fan 6 at a normal rotation speed. On the other hand, based on the detection result of the vehicle state detector 3, when the electric mobility 1 is in a stopped state, the conductor selection unit 5 outputs the power input from the interface 4 to the air-cooling fan 6 via the low rotation speed cable to rotate the air-cooling fan 6 in a low rotation mode lower than the normal rotation speed. In one embodiment, the conductor selection unit 5 functions as a rotation speed control device.

[0015] The air-cooling fan 6 is configured using an air-cooling fan for passenger cars. The air-cooling fan 6 rotates based on the cable selected by the conductor selection unit 5 and the power input via the interface 4. The air-cooling fan 6 cools the condenser of an air conditioner (not shown) (hereinafter simply referred to as "air conditioner") by rotating.

[0016] At least a portion of the body 7 is made of a resin skeleton, and the body 7 is formed in part from a resin material, so that the joining of these components can be achieved by adhesive bonding, caulking, bolt fastening, or other welding methods can be omitted.

[0017] The frequency characteristics of the sound inside the vehicle cabin in the electric mobility 1 configured as described above will be described below. Fig. 2 is a diagram showing the frequency characteristics of the sound inside the vehicle cabin. In Fig. 2, the horizontal axis represents frequency [Hz], and the vertical axis represents sound pressure [dB]. Also in Fig. 2, curve L1 represents the relationship between frequency and sound pressure at a vehicle speed of 60 km / h, curve L2 represents the relationship between frequency and sound pressure at a vehicle speed of 30 km / h, curve L3 represents the relationship between frequency and sound pressure at a vehicle speed of 10 km / h, and curve L4 represents the relationship between frequency and sound pressure when the vehicle is stopped (A / C: ON).

[0018] As indicated by the curve L4 and the arrow A1 in FIG. 2, when the electric mobility 1 is stopped, the background noise increases.

[0019] Fig. 3 is a diagram showing the relationship between the peak level and protrusion amount of the first-order fan rotation of the air-cooling fan 6. In Fig. 3, the horizontal axis represents vehicle speed [km / h], and the vertical axis represents sound pressure [dB]. Also in Fig. 3, curve L10 represents the peak level of the first-order fan rotation of the air-cooling fan 6, and curve L11 represents the protrusion amount of the sound pressure of the first-order fan rotation component of the air-cooling fan 6.

[0020] As shown by curves L10 and L11 in FIG. 3, the protruding amount of sound pressure of the first-order component of fan rotation of the air-cooling fan 6 increases as the electric mobility 1 stops, and decreases as the vehicle speed increases.

[0021] Fig. 4 is a diagram showing the relationship between the sound and frequency inside the vehicle cabin of the electric mobility 1. In Fig. 4, the horizontal axis represents frequency [Hz], and the vertical axis represents the sound inside the vehicle cabin [dB].

[0022] As shown in Figure 4, the acoustic characteristics (resonance) have a frequency peak of 27 Hz, the resin body structure resonance (around the windshield) has a frequency peak of 37 Hz, and the primary electric fan rotation has a frequency peak of 39 Hz. Furthermore, the resonance of the resin body top plate has a frequency peak of 63 Hz, and the air conditioner compressor has a frequency peak of 75 Hz.

[0023] As shown in Fig. 4, in the past, the resin body structure resonance (around the windshield) and the peak of the primary frequency of the electric fan rotation were superimposed, causing the noise to worsen.

[0024] Fig. 5 is a diagram showing the relationship between the noise level and frequency of the sound inside the vehicle cabin when the conductor selection unit 5 selects the low rotation mode for the air-cooling fan 6. In Fig. 5, the horizontal axis represents frequency [Hz], and the vertical axis represents the noise level [dB] inside the vehicle cabin.

[0025] As indicated by arrow B1 in Figure 5, when the conductor selection unit 5 switches the rotation speed of the air-cooling fan 6 from the normal rotation speed of 38 Hz to a low rotation mode of 36 Hz, which is 2 Hz (120 rpm) lower, while the electric mobility 1 is stopped, the noise inside the vehicle cabin is reduced by approximately 6.1 dB. In other words, the conductor selection unit 5 rotates the air-cooling fan 6 in a low rotation mode in which the primary rotation frequency is lower than the resonance frequency of the body 7 of the electric mobility 1. This makes it possible to reduce the noise of the air-cooling fan 6 even when an air-cooling fan 6 for a passenger car is used.

[0026] According to the embodiment described above, the conductor selection unit 5 differentiates the resonance frequency of the body from the primary rotational frequency of the air-cooling fan 6, so even when an air-cooling fan 6 for a passenger car is used, it is possible to reduce the noise of the air-cooling fan 6. In other words, it is possible to reduce the noise inside the vehicle cabin of the electric mobility 1 by setting the range to a small magnification ratio of the vibration transmission system.

[0027] Furthermore, according to one embodiment, a portion of the body 7 is formed from a resin material, and the joining of these parts is performed without welding such as by gluing, crimping, or bolting, thereby reducing noise caused by the superposition of low-frequency resonance that occurs due to joining that is unique to resin materials.

[0028] Furthermore, according to one embodiment, the air-cooling fan 6 is configured using an air-cooling fan for a passenger car, so that surplus cooling capacity can be utilized to achieve both low cost and low noise.

[0029] Furthermore, according to one embodiment, the conductor selection unit 5 rotates the air-cooling fan 6 in a low rotation mode in which the primary rotation frequency is lower than the resonance frequency of the body 7 of the electric mobility 1, thereby further reducing noise inside the vehicle cabin of the electric mobility 1.

[0030] Furthermore, according to one embodiment, the conductor selection unit 5 adjusts the normal rotation speed of the air-cooling fan 6 based on the detection results of the vehicle state detector 3, so that it can be varied according to the situation, thereby achieving both cooling and low noise.

[0031] Furthermore, according to one embodiment, the conductor selection unit 5 switches the power supply system of the air-cooling fan 6 depending on the operating state of the electric mobility 1 via multiple cables with different electrical resistance values, so that the rotation speed of the air-cooling fan 6 can be switched with a simple configuration, thereby reducing costs.

[0032] Furthermore, according to one embodiment, a frequency is selected at which the noise of the air-cooling fan 6 becomes a resonance multiplier of less than 10 dB due to the body resonance of the body 7, and the fan rotation speed (frequency) of the air-cooling fan 6 is set to be equal to or lower than that frequency, thereby suppressing the increase in fan noise due to the resonance multiplier and achieving noise reduction.

[0033] In one embodiment, when the resonant frequency of the body 7 changes depending on the vehicle speed or vehicle temperature detected by the vehicle state detector 3, the conductor selection unit 5 may change the rotation speed of the cooling fan 6 to a frequency lower than that frequency. This makes it possible to suppress an increase in fan noise due to the resonant magnification and reduce noise.

[0034] In one embodiment, the vehicle state detector 3 may detect the resonance frequency of the body 7, and the conductor selection unit 5 may reduce the rotational speed of the cooling fan 6 below the resonance frequency based on the detection result.

[0035] In one embodiment, when the vehicle interior temperature detected by the vehicle condition detector 3 is lower than the air conditioner set temperature, the air-cooling fan 6 may be rotated in a low rotation mode. This allows for reduced noise in the region where there is excess cooling capacity.

[0036] (Variation) Fig. 6 is a block diagram showing the functional configuration of an electric mobility according to a modified example of the embodiment. In the electric mobility 1A shown in Fig. 6, unlike the electric mobility 1 according to the first embodiment described above, the conductor selection unit 5 drives the air-cooling fan 6 in low rotation mode without providing feedback that the electric mobility 1A has stopped traveling.

[0037] According to the embodiment described above, even when an air-cooling fan 6 for a passenger vehicle is employed, the noise of the air-cooling fan 6 can be reduced.

[0038] (Other forms) Further advantages and modifications will readily occur to those skilled in the art. The invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

[0039] Although some of the embodiments of the present application have been described in detail above with reference to the drawings, these are merely examples, and the present invention can be implemented in other forms that have undergone various modifications and improvements based on the knowledge of those skilled in the art, including the aspects described in the disclosure of the present invention. [Explanation of symbols]

[0040] 1,1A Electric Mobility 2 Power supply 3 Vehicle status detector 4. Interface 5 Conductor selection section 6 Cooling fan 7 Body

Claims

[Claim 1] a body at least partially made of a resin skeleton; an interior air conditioner for conditioning the interior of the vehicle body; an air-cooling fan for cooling a condenser of the indoor air-conditioning air conditioner; An electric mobility vehicle comprising: a rotation speed control device that makes the resonance frequency of the body different from the primary rotation frequency of the air-cooling fan; Electric mobility.

Images