Concentration detection device

A technology for concentration detection and ethanol concentration, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of large changes in electrostatic capacitance and large deviations, and achieve the effect of accurate detection and cost reduction.

Inactive Publication Date: 2014-05-07
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is generally considered that when the deterioration of the electrodes etc. is large, the amount of change in conductivity and capacitance due to the deterioration becomes large, and the deviation between the calculated ethanol concentration and the actual concentration becomes large.

Method used

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Embodiment approach 1

[0036] figure 1 It is a schematic diagram for explaining the installation state of the concentration detection device in Embodiment 1 of the present invention. Such as figure 1 As shown, the concentration detection device 2 is used to detect the concentration of ethanol in the mixed fuel, for example, when using a mixed fuel in which ethanol is mixed with gasoline. exist figure 1 In , an example is shown in which the concentration detection device is installed in the fuel path 6 of the internal combustion engine 4 mounted in a vehicle or the like. However, in the present invention, the installation and use positions of the concentration detection device 2 are not limited thereto, and the concentration detection device 2 can be widely used in positions where fuel concentration detection is required.

[0037] The concentration detection device 2 is provided with a pair of electrodes 8 arranged apart from each other. At least a part of the electrode 8 is provided in the fuel ...

Embodiment approach 2

[0069] The concentration detecting device of Embodiment 2 becomes the same as figure 1 The same configuration of the device. The concentration detecting device of the second embodiment is the same as the device of the first embodiment except that the temperature of the mixed fuel is detected simultaneously with the detection of the ethanol concentration.

[0070] Figure 6 This is a graph for explaining the relationship between the electrical conductivity (the reciprocal of the resistance value) and the capacitance of the fuel. As described above, the resistance component of fuel has a correlation with temperature. Additionally, if Figure 6 As shown, the electrostatic capacitance of the fuel also has a correlation with temperature, and changes according to the temperature. Specifically, as the temperature rises, the electrical conductivity becomes higher, and the electrostatic capacitance becomes smaller as the temperature rises. In addition, as described above, the elec...

Embodiment approach 3

[0083] Figure 8 It is a figure for explaining the change of the conversion value of the concentration by the concentration detection device with respect to the change of the amount of water mixed in mixed fuel in Embodiment 3 of the present invention, the horizontal axis represents the water mixed amount [wt%], and the vertical axis Indicates the concentration conversion value [wt%]. Line segments (a), (b), and (c) show examples when the initial concentration of ethanol mixed into the mixed fuel is 100%, 85%, and 22%.

[0084] Here, the dielectric constant of water is about 3.3 times that of ethanol. Therefore, when a blended fuel in which ethanol is mixed with gasoline is used as fuel, the electrostatic capacity thereof increases by 1.5% due to a 1% increase in the amount of ethanol mixed with water. Therefore, as in the line segment (b) where the concentration of ethanol mixed into gasoline as fuel is 85%, for example, when the amount of water mixed increases by 1%, it me...

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Abstract

A concentration detecting apparatus that detects the alcohol concentration of an alcohol blended fuel includes frequency controlling means that controls the frequency of an alternating-current voltage applied between a pair of electrodes spaced apart from each other. A first resistance constituent value between the electrodes is detected by applying an alternating-current voltage at a first frequency at which a capacitance constituent value of the impedance is zero. Similarly, a second resistance constituent value between said electrodes is detected by applying an alternating-current voltage at a second frequency different from the first frequency at which the capacitance constituent value of the impedance is zero. The alcohol concentration is calculated based on the difference between the first resistance constituent value and the second resistance constituent value.

Description

technical field [0001] The invention relates to a concentration detection device. More specifically, it relates to a concentration detection device suitable for detecting the concentration of ethanol in ethanol blended fuel supplied to an internal combustion engine. Background technique [0002] In recent years, from the viewpoint of reducing gasoline consumption, etc., the use of ethanol, which emits less CO and HC, as a fuel for internal combustion engines has attracted attention. vehicles (FFV). The optimum air-fuel ratio of the mixed fuel containing ethanol fuel is different according to the concentration of ethanol. Therefore, in order to perform appropriate air-fuel ratio control, a simple device capable of more accurately grasping the concentration of ethanol in the mixed fuel is desired. [0003] Patent Document 1 discloses a conventional concentration detection device for detecting the concentration of ethanol in ethanol blended fuel. In the concentration detect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/02
CPCG01N33/2852G01N27/06
Inventor 青木圭一郎
Owner TOYOTA JIDOSHA KK
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