CN111412926A - Speed ratio conversion method for fixed odometer for vehicle - Google Patents
Speed ratio conversion method for fixed odometer for vehicle Download PDFInfo
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- CN111412926A CN111412926A CN202010308942.1A CN202010308942A CN111412926A CN 111412926 A CN111412926 A CN 111412926A CN 202010308942 A CN202010308942 A CN 202010308942A CN 111412926 A CN111412926 A CN 111412926A
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- odometer
- speed ratio
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- speed
- vehicle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C23/00—Combined instruments indicating more than one navigational value, e.g. for aircraft; Combined measuring devices for measuring two or more variables of movement, e.g. distance, speed or acceleration
Abstract
The invention discloses a speed ratio conversion method of a fixed odometer for a vehicle, which comprises the following steps: inputting vehicle odometer speed ratio K1And simultaneously determining the fixed odometer speed ratio K of the meter output2(ii) a The sensor collects the speed signal and records the speed as V, and after receiving a pulse, the sensor records the speed as V according to the formula fi＝K1× V/3600 calculating sampling frequency fi(ii) a If a pulse is not received, continuing to transmit the pulse until a pulse is received, and then calculating the sampling frequency fi(ii) a According to the fixed odometer speed ratio K2And a sampling frequency fiAccording to the formula fo＝K2×fi/K1Calculating the output frequency f of the instrumento. By the method for converting the fixed odometer speed ratio, the instrument converts the speed ratio of the odometer input to the instrument, and the instrument outputs the fixed odometer speed ratio to the outside to meet the requirement of a driving recorder or other parts on the generalization of the odometer speed ratio.
Description
Technical Field
The invention relates to the technical field of automotive electronics, in particular to a method for converting a fixed odometer speed ratio for a vehicle.
Background
The vehicle speed sensor is divided into a contact sensor and a non-contact sensor. The rotating shaft of the contact type vehicle speed sensor is connected with the output driven gear of the gearbox, and in order to ensure that the speed ratio of the odometer is fixed and unchanged, the transmission ratio of the worm gear and the worm of the gearbox output of different vehicle types needs to be adjusted and applied, so that the part number of the gearbox is not universal. The non-contact type sensor is not mechanically and rotationally connected with the gearbox, when a main shaft of the gearbox rotates, a gap between a sensor sensing surface and an end surface of a gear sensed by the main shaft of the gearbox changes to form a Hall effect, for the non-contact type vehicle speed sensor, the odometer speed ratios of different vehicle types are different due to different rolling radiuses of tires of different vehicle types and different speed ratios of a drive axle, the outgoing vehicle speed of the meter is generally output according to 1:1, and therefore when the speed ratios of the odometer change, the odometer speed ratios of output signals of the meter change simultaneously. The odometer speed ratio is the number of pulses output by the vehicle speed sensor when the vehicle runs for 1km, and can also be called the number of pulses per kilometer.
Disclosure of Invention
The invention aims to provide a vehicle fixed odometer speed ratio conversion method which can output a fixed odometer speed ratio to the outside by an instrument no matter what the odometer speed ratio input to the instrument is.
In order to achieve the purpose, the speed ratio conversion method of the fixed odometer for the vehicle, which is designed by the invention, comprises the following steps:
1) inputting vehicle odometer speed ratio K1And simultaneously determining the fixed odometer speed ratio K of the meter output2；
2) The sensor collects the speed signal and records the speed as V, and receives a pulseAfter impact according to the formula fi＝K1× V/3600 calculating sampling frequency fi(ii) a If a pulse is not received, continuing to transmit the pulse until a pulse is received, and then calculating the sampling frequency fi；
3) According to the fixed odometer speed ratio K in the step 1)2And the sampling frequency f calculated in step 2)iAccording to the formula fo＝K2×fi/K1Calculating the output frequency f of the instrumento。
Further, f in the step 3)o＝K2×fi/K1The specific derivation process is as follows:
K2fixed odometer speed ratio for meter output according to formula fi＝K1× V/3600 to obtain fo＝K2×V/3600＝(K2/3600)×(3600fi/K1)＝K2×fi/K1In the same way, obtain K2＝3600fo/V。
Compared with the prior art, the invention has the following advantages: by the method for converting the fixed odometer speed ratio, the instrument converts the speed ratio of the odometer input to the instrument, and the instrument outputs the fixed odometer speed ratio to the outside to meet the requirement of a driving recorder or other parts on the generalization of the odometer speed ratio.
Drawings
FIG. 1 is a schematic flow chart of a method for converting the speed ratio of a fixed odometer for a vehicle according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Fig. 1 shows a flow chart of a speed ratio conversion method of a fixed odometer for a vehicle, and the specific conversion process is as follows:
1) inputting vehicle odometer speed ratio K1And simultaneously determining the fixed odometer speed ratio K of the meter output2；
For example, the vehicle runs for 1 minute at the speed of 60km/h, the mileage is 1km, and the pulse number received by the meter by the vehicle speed sensor is K1Then K is1Is the odometer speed ratio;
2) the sensor collects the speed signal and records the speed as V, and after receiving a pulse, the sensor records the speed as V according to the formula fi＝K1× V/3600 calculating sampling frequency fi(ii) a If a pulse is not received, continuing to transmit the pulse until a pulse is received, and then calculating the sampling frequency fi(ii) a In turn, e.g. knowing the vehicle speed V and the input frequency fiThen odometer speed ratio K1＝3600fi/V。
3) According to the fixed odometer speed ratio K in the step 1)2And the sampling frequency f calculated in step 2)iAccording to the formula fo＝K2×fi/K1Calculating the output frequency f of the instrumento。
Wherein f iso＝K2×fi/K1The specific derivation process is as follows:
K2fixed odometer speed ratio for meter output according to formula fi＝K1× V/3600 to obtain fo＝K2×V/3600＝(K2/3600)×(3600fi/K1)＝K2×fi/K1In the same way, obtain K2＝3600fo/V。
Example 1
The velocity ratio of the odometer of a certain vehicle is K118000, determining the fixed odometer speed ratio K of the meter output2Is 6000:
when the vehicle speed is 30km/h, the sampling frequency is fi＝18000×30/3600＝150Hz；
The meter should output frequency f at this timeo：
fo＝K2×fi/K1＝6000×150/18000＝50Hz。
I.e. odometer speed ratio K3600 × 50/30 6000K2
Example 2
When the vehicle speed is 90km/h, the sampling frequency is fi＝18000×90/3600＝450Hz；
fo＝6000×450/18000＝150Hz。
Odometer speed ratio K3600 × 150/90K 6000K2
Therefore, by the method for converting the fixed odometer speed ratio, no matter what the speed ratio of the odometer input to the meter is, the meter outputs the fixed odometer speed ratio to the outside so as to meet the requirement of a driving recorder or other parts on the generalization of the odometer speed ratio.
Claims (2)
1. A speed ratio conversion method for a fixed odometer for a vehicle is characterized by comprising the following steps: the conversion method comprises the following steps:
1) inputting vehicle odometer speed ratio K1And simultaneously determining the fixed odometer speed ratio K of the meter output2；
2) The sensor collects the speed signal and records the speed as V, and after receiving a pulse, the sensor records the speed as V according to the formula fi＝K1× V/3600 calculating sampling frequency fi(ii) a If a pulse is not received, continuing to transmit the pulse until a pulse is received, and then calculating the sampling frequency fi；
3) According to the fixed odometer speed ratio K in the step 1)2And the sampling frequency f calculated in step 2)iAccording to the formula fo＝K2×fi/K1Calculating the output frequency f of the instrumento。
2. The method for shifting the speed ratio of a fixed odometer for a vehicle according to claim 1, characterized in that:
in said step 3) fo＝K2×fi/K1The specific derivation process is as follows:
K2fixed odometer speed ratio for meter output according to formula fi＝K1× V/3600 to obtain fo＝K2×V/3600＝(K2/3600)×(3600fi/K1)＝K2×fi/K1In the same way, obtain K2＝3600fo/V。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010308942.1A CN111412926A (en) | 2020-04-19 | 2020-04-19 | Speed ratio conversion method for fixed odometer for vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010308942.1A CN111412926A (en) | 2020-04-19 | 2020-04-19 | Speed ratio conversion method for fixed odometer for vehicle |
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| CN111412926A true CN111412926A (en) | 2020-07-14 |
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| CN202010308942.1A Pending CN111412926A (en) | 2020-04-19 | 2020-04-19 | Speed ratio conversion method for fixed odometer for vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114435274A (en) * | 2022-01-19 | 2022-05-06 | 东风汽车股份有限公司 | Hard wire output conversion method for CAN bus vehicle speed |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153975A (en) * | 2016-07-05 | 2016-11-23 | 北汽福田汽车股份有限公司 | A kind of method, system and vehicle exporting vehicle speed pulse |
| CN109591597A (en) * | 2018-12-17 | 2019-04-09 | 安徽江淮汽车集团股份有限公司 | A kind of input method and signal controller system of signal controller |
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2020
- 2020-04-19 CN CN202010308942.1A patent/CN111412926A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153975A (en) * | 2016-07-05 | 2016-11-23 | 北汽福田汽车股份有限公司 | A kind of method, system and vehicle exporting vehicle speed pulse |
| CN109591597A (en) * | 2018-12-17 | 2019-04-09 | 安徽江淮汽车集团股份有限公司 | A kind of input method and signal controller system of signal controller |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114435274A (en) * | 2022-01-19 | 2022-05-06 | 东风汽车股份有限公司 | Hard wire output conversion method for CAN bus vehicle speed |
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Application publication date: 20200714 |