CN102759632A - Device and method for measuring rotational speed of engine based on differential pressure signals of exhaust back pressure - Google Patents
Device and method for measuring rotational speed of engine based on differential pressure signals of exhaust back pressure Download PDFInfo
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- CN102759632A CN102759632A CN2012102600580A CN201210260058A CN102759632A CN 102759632 A CN102759632 A CN 102759632A CN 2012102600580 A CN2012102600580 A CN 2012102600580A CN 201210260058 A CN201210260058 A CN 201210260058A CN 102759632 A CN102759632 A CN 102759632A
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Abstract
The invention discloses a device and a method for measuring rotational speed of an engine based on differential pressure signals of exhaust back pressure. The device provided by the invention comprises a DPF particle collector, exhaust back pressure difference transducers, a signal transmission cable and a controller, wherein the exhaust back pressure difference transducers are arranged at the front end and the rear end of the particle collector and connected with the controller through the signal transmission cable; and a signal conditioning unit, a signal processing unit, a signal analysis unit and a communication unit are sequentially connected and arranged in the controller. The method provided by the invention includes the steps that pressure difference signals are isolated, filtered and amplified through the signal conditioning unit in the controller; then signal voltage is adjusted to the input range allowable for digital processing, and the digital to analog conversion is performed for sample data; Fourier transform (FFT) is performed for the signals, subjected to conversion, through a digital processing unit, and the impulse frequency is converted into the rotational speed value of the engine taking the revolution/minute (RPM) as the unit through the arranged engine stroke and the amount of cylinders; and finally, the rotational speed is output and displayed through the communication unit in the manner of UART or CAN. The device provided by the invention is not directly contacted with the rotating shaft of the engine, has simple structural form and reasonable design, and is convenient to install and debug.
Description
Technical field
The present invention relates to motor car engine detection technique field, in particular, relate to a kind of device and method that uses the exhaust back pressure differential pressure pickup measuring machine motor vehicle engine rotating speed in the diesel particulate filtering system.
Background technology
Along with vehicular emission rules increasingly stringent, the particle post-processing technology has become the important channel of emission of diesel engine control, in the post-processing technology the most one of effective measures be to adopt diesel particulate drip catcher (DPF).In the DPF system, need measure engine speed, and accurate record.This equally also is the important content of automobile failure diagnosis research.
The Traditional engine tachometric survey is the tachometer gage of on engine shaft, installing with the engine shaft contact, from engine electric-controlled unit (ECU), reads through CAN.This method needs the extra sensor that installs additional, and not only having influenced the car load circuit has also increased cost, and rotating speed read the restriction that also receives the CAN of engine producer agreement.
Summary of the invention
The present invention seeks to overcome the above-mentioned deficiency that prior art exists, a kind of motor car engine rotating speed measurement method and measurement mechanism are provided, its measuring accuracy and reliability are high, can realize the robotization and the intellectuality of measuring.
The present invention is based on the exhaust back pressure pressure difference signal and measure the device of engine speed, said device comprises: DPF particle drip catcher, exhaust back pressure differential pressure pickup, signal-transmitting cable and controller; The exhaust back pressure differential pressure pickup is installed in particle drip catcher rear and front end, and the exhaust back pressure differential pressure pickup connects controller through signal-transmitting cable; Signal condition unit, signal processing unit, signal analysis unit and the communication unit that connects successively is set in the said controller.
Said signal condition unit is the chip with isolation, filtering and enlarging function.
Said communication unit connects output display unit.
The present invention is based on the exhaust back pressure pressure difference signal and measure the method for engine speed, use the exhaust back pressure differential pressure pickup obtains in the said apparatus pressure difference signal earlier through the signal condition unit in the controller isolate, filtering and amplification; Signal outside the set speed-frequency scope of filtering is adjusted to the input range that digital processing allows with signal voltage again, confirms SF according to Shannon's sampling theorem, and sampled data is carried out digital-to-analog conversion (AD conversion); Carry out Fourier transform (FFT) to the signal after the conversion through digital processing element, obtain corresponding frequency spectrum figure; Signal analysis unit analysis spectrum figure also finds out and the proportional fundamental frequency of engine speed, and converting into pulsed frequency with commentaries on classics/per minute (RPM) by engine strokes that is provided with and number of cylinders is the engine speed value of unit; At last rotating speed is exported demonstration through communication unit with serial mode (UART) or CAN mode.
The present invention with respect to prior art, has following advantage according to the device and method of back pressure signal measuring machine motor vehicle engine rotating speed:
(1) in the DPF system, uses existing exhaust back pressure differential pressure pickup not need extra installation tachometer gage, therefore do not receive the constraint and the restriction of engine producer.
(2) this device not only can independently use but also can be used as a DPF system part, had improved reliability and economy.
(3) because this contrive equipment does not directly contact engine shaft, version is simple, reasonable in design, is convenient to Installation and Debugging.
Description of drawings
Fig. 1 is a measurement mechanism synoptic diagram of the present invention;
Fig. 2 is a measurement mechanism middle controller structured flowchart of the present invention.
Embodiment
Below in conjunction with accompanying drawing patent of the present invention is further described.
As depicted in figs. 1 and 2, the device that the present invention is based on exhaust back pressure pressure difference signal measurement engine speed comprises: DPF particle drip catcher 1; Exhaust back pressure differential pressure pickup 2; Signal-transmitting cable 3; Controller 4; The exhaust back pressure differential pressure pickup is installed in particle drip catcher rear and front end, and the exhaust back pressure differential pressure pickup connects controller through signal-transmitting cable; Signal condition unit 5, signal processing unit 6, signal analysis unit 7 and the communication unit 8 that connects successively is set in the said controller.Can to use bandpass filtering, the signal processing unit be made up of the AD810 chip be after collecting conditioned signal, to carry out Fourier transform through FFT in the signal condition unit in the practical implementation, and it is that frequency-region signal according to FFT calculates rotating speed, communication unit can use MAX232 serial communication or CAN (PCA28C250) communication dual mode that time-domain signal is transformed into frequency-region signal, signal analysis unit.
The present invention is based on the exhaust back pressure pressure difference signal and measure the method for engine speed, use the exhaust back pressure differential pressure pickup obtains in the said apparatus pressure difference signal earlier through the signal condition unit in the controller isolate, filtering and amplification; Signal outside the set speed-frequency scope of filtering is adjusted to the input range (0-3.3V) that digital processing allows with signal voltage again, confirms SF according to Shannon's sampling theorem, and sampled data is carried out digital-to-analog conversion (AD conversion); Carry out Fourier transform (FFT) to the signal after the conversion through digital processing element, obtain corresponding frequency spectrum figure; Signal analysis unit analysis spectrum figure also finds out and the proportional fundamental frequency of engine speed, and converting into pulsed frequency with commentaries on classics/per minute (RPM) by engine strokes that is provided with and number of cylinders is the engine speed value of unit; At last rotating speed is exported demonstration through communication unit with serial mode (UART) or CAN mode.
Claims (4)
1. the device based on exhaust back pressure pressure difference signal measurement engine speed is characterized in that said device comprises: DPF particle drip catcher, exhaust back pressure differential pressure pickup, signal-transmitting cable and controller; The exhaust back pressure differential pressure pickup is installed in particle drip catcher rear and front end, and the exhaust back pressure differential pressure pickup connects controller through signal-transmitting cable; Signal condition unit, signal processing unit, signal analysis unit and the communication unit that connects successively is set in the said controller.
2. according to the said device of claim 1, it is characterized in that said signal condition unit is the chip with isolation, filtering and enlarging function based on exhaust back pressure pressure difference signal measurement engine speed.
3. according to the said device of claim 1, it is characterized in that said communication unit connects output display unit based on exhaust back pressure pressure difference signal measurement engine speed.
4. method of measuring engine speed based on the exhaust back pressure pressure difference signal; It is characterized in that, use the exhaust back pressure differential pressure pickup obtains in the said device of claim 1 pressure difference signal earlier through the signal condition unit in the controller isolate, filtering and amplification; Signal outside the set speed-frequency scope of filtering is adjusted to the input range that digital processing allows with signal voltage again, confirms SF according to Shannon's sampling theorem, and sampled data is carried out digital-to-analog conversion; Carry out Fourier transform to the signal after the conversion through digital processing element, obtain corresponding frequency spectrum figure; Signal analysis unit analysis spectrum figure also finds out and the proportional fundamental frequency of engine speed, and by engine strokes that is provided with and number of cylinders pulsed frequency being converted into commentaries on classics/per minute is the engine speed value of unit; At last rotating speed is exported demonstration through communication unit with serial mode or CAN mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210260058.0A CN102759632B (en) | 2012-07-26 | 2012-07-26 | Device and method for measuring rotational speed of engine based on differential pressure signals of exhaust back pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210260058.0A CN102759632B (en) | 2012-07-26 | 2012-07-26 | Device and method for measuring rotational speed of engine based on differential pressure signals of exhaust back pressure |
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| Publication Number | Publication Date |
|---|---|
| CN102759632A true CN102759632A (en) | 2012-10-31 |
| CN102759632B CN102759632B (en) | 2014-06-25 |
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| CN201210260058.0A Expired - Fee Related CN102759632B (en) | 2012-07-26 | 2012-07-26 | Device and method for measuring rotational speed of engine based on differential pressure signals of exhaust back pressure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513050A (en) * | 2013-10-08 | 2014-01-15 | 江阴众和电力仪表有限公司 | Rotating speed measuring method and device of rotating speed analog device in LOCA furnace |
| CN110685839A (en) * | 2019-09-24 | 2020-01-14 | 西安中星测控有限公司 | Method for detecting blockage of three-filter system for vehicle based on pressure sensor |
| CN112557041A (en) * | 2020-11-20 | 2021-03-26 | 神龙汽车有限公司 | Pressure device and method for simulating blocking fault of GPF particle catcher |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102269035A (en) * | 2011-06-22 | 2011-12-07 | 安徽艾可蓝节能环保科技有限公司 | Fuel oil combustion control system for concurrent heating regeneration system of diesel engine tail gas particle catcher |
| CN202083544U (en) * | 2011-04-01 | 2011-12-21 | 浙江大学 | Test device for engine thermal management system |
| CN202300587U (en) * | 2011-08-25 | 2012-07-04 | 安徽全柴动力股份有限公司 | Automobile tail gas particle catcher with pressure difference measuring interface |
| CN202710584U (en) * | 2012-07-26 | 2013-01-30 | 中国人民解放军军事交通学院 | Device for measuring rotational speed of engine based on differential pressure signal of exhaust back pressure |
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2012
- 2012-07-26 CN CN201210260058.0A patent/CN102759632B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202083544U (en) * | 2011-04-01 | 2011-12-21 | 浙江大学 | Test device for engine thermal management system |
| CN102269035A (en) * | 2011-06-22 | 2011-12-07 | 安徽艾可蓝节能环保科技有限公司 | Fuel oil combustion control system for concurrent heating regeneration system of diesel engine tail gas particle catcher |
| CN202300587U (en) * | 2011-08-25 | 2012-07-04 | 安徽全柴动力股份有限公司 | Automobile tail gas particle catcher with pressure difference measuring interface |
| CN202710584U (en) * | 2012-07-26 | 2013-01-30 | 中国人民解放军军事交通学院 | Device for measuring rotational speed of engine based on differential pressure signal of exhaust back pressure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513050A (en) * | 2013-10-08 | 2014-01-15 | 江阴众和电力仪表有限公司 | Rotating speed measuring method and device of rotating speed analog device in LOCA furnace |
| CN110685839A (en) * | 2019-09-24 | 2020-01-14 | 西安中星测控有限公司 | Method for detecting blockage of three-filter system for vehicle based on pressure sensor |
| CN112557041A (en) * | 2020-11-20 | 2021-03-26 | 神龙汽车有限公司 | Pressure device and method for simulating blocking fault of GPF particle catcher |
| CN112557041B (en) * | 2020-11-20 | 2023-03-28 | 神龙汽车有限公司 | Pressure device and method for simulating GPF particle catcher blocking fault |
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| Publication number | Publication date |
|---|---|
| CN102759632B (en) | 2014-06-25 |
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