CN103217183A - Device for driving electromagnetic type combination instrument by broadcasting data of automobile engine - Google Patents
Device for driving electromagnetic type combination instrument by broadcasting data of automobile engine Download PDFInfo
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- CN103217183A CN103217183A CN2013101109562A CN201310110956A CN103217183A CN 103217183 A CN103217183 A CN 103217183A CN 2013101109562 A CN2013101109562 A CN 2013101109562A CN 201310110956 A CN201310110956 A CN 201310110956A CN 103217183 A CN103217183 A CN 103217183A
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Abstract
The invention belongs to the field of automobile electronic products, in particular relates to a device for driving an electromagnetic type combination instrument by broadcasting data of an automobile engine. The device comprises a singlechip microcomputer, a CAN (Controller Area Network) bus communication interface circuit, a rotating speed signal converting circuit, a water temperature signal converting and driving circuit, a water temperature overhigh indicating lamp control circuit, an oil pressure signal converting and driving circuit, an oil pressure over-low indicating lamp control circuit and a power supply circuit. The singlechip microcomputer obtains water temperature, oil pressure and rotating speed data of the engine from broadcasting data of an engine ECU (Electronic Control Unit) above European III standard by an SAE (Society of Automotive Engineers) J1939 protocol, and after treatment, a water-thermometer, an oil pressure gauge and a revolution meter in the electromagnetic type combination instrument are respectively driven to indicate state data by pointer. When the oil pressure is lower than an alarm value, the oil pressure over-low indicating lamp in the instrument is controlled to flash to alarm, while the water temperature is higher than the alarm value, the water temperature overhigh indicating lamp is controlled to flash to alarm, water temperature sensor, oil pressure sensor, rotating speed sensor and the like of the engine to be installed for the electromagnetic type combination instrument are replaced, and the existing defects of the sensors are overcome.
Description
Technical field
The invention belongs to the automobile electronics field, particularly a kind of device that utilizes motor car engine to report data-driven electromagnetic type combination instrument.
Background technology
At present, the motor car engine ECU of the above standard of most Europe III has used the SAE J1939 agreement of CAN bus communication.In the course of the work, Engine ECU is periodically outwards reported the data such as water temperature (also claiming coolant temperature), oil pressure (also claiming engine oil pressure) and rotating speed of engine by the CAN bus, and these data just automobile instrument panel with the part of the motoring condition data of pointer or data presentation.
The processor of novel CAN field bus instrument is used to the data such as engine water temperature, oil pressure and rotating speed periodically reported from engine ECU just, and drive stepping motor has realized the pointer indication of engine water temperature, oil pressure and rotary speed information after conversion process.But, because CAN field bus instrument cost, price are higher relatively, make the production of quite a few automobile still continue to use ripe electromagnetic type combination instrument, information such as its engine water temperature, oil pressure and rotating speed then come from corresponding engine water temperature sensor, engine oil pressure sensor and the engine speed sensor of installing.Yet above-mentioned three kinds of sensors that automobile electromagnetic formula combination instrument uses exist: defectives such as installation and maintenance inconvenience, non-fault life time fall short of, measurement parameter is not accurate enough.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, the automobile at above model engine of Europe III and use electromagnetic type combination instrument are installed provides a kind of device that utilizes motor car engine to report data-driven electromagnetic type combination instrument.
The technical solution adopted in the present invention is:
Utilize motor car engine to report the device of data-driven electromagnetic type combination instrument, it is characterized in that, comprise power circuit, single-chip microcomputer, CAN bus communication interface circuit, the tach signal translation circuit, water temperature signal conversion driving circuit, the too high pilot lamp control circuit of water temperature, fuel injection pressure signal conversion driving circuit and oil pressure are crossed low pilot lamp control circuit, power circuit is converted into the stabilized power source that device needs to automobile power source, single-chip microcomputer is connected with engine CAN bus communication interface through CAN bus communication interface circuit, the signal input part of single-chip microcomputer engine speed indicator in tach signal translation circuit connection electromagnetic type combination instrument, the signal input part of single-chip microcomputer water-thermometer in water temperature signal conversion driving circuit connection electromagnetic type combination instrument, the signal input part of single-chip microcomputer oil pressure gauge in fuel injection pressure signal conversion driving circuit connection electromagnetic type combination instrument, single-chip microcomputer is the too high alarm lamp of water temperature in the too high pilot lamp control circuit of water temperature control electromagnetic type combination instrument, and single-chip microcomputer is crossed in the low pilot lamp control circuit control electromagnetic type combination instrument oil pressure through oil pressure and crossed low alarm lamp.
The above-mentioned device that utilizes motor car engine to report data-driven electromagnetic type combination instrument, it is characterized in that, the program of single-chip microcomputer at first need be set up " water temperature is reported data-PWM pulsewidth parameter " at water-thermometer, oil pressure gauge in the electromagnetic type combination instrument of concrete model respectively, " oil pressure is reported data-PWM pulsewidth parameter " concerns corresponding form, needs to determine the flywheel teeth numerical value K of the suitable tachometric survey of engine speed indicator in this model instrument simultaneously; After single-chip microcomputer utilizes CAN bus SAEJ1939 communication protocol to obtain the engine water temperature data by CAN bus communication interface circuit from Engine ECU report data at every turn, promptly inquiry obtains the PWM pulsewidth parameter that Single-chip Controlling is exported from " water temperature is reported data-PWM pulsewidth parameter " related table, this pwm signal is transformed to the drive voltage signal of regulating the water-thermometer coil current through water temperature signal conversion driving circuit, deliver to the signal input part of water-thermometer again, realize the tram pointer indication of current water temperature value; If too high then the warning by the too high pilot lamp flicker of the too high pilot lamp control circuit of water temperature control water temperature of water temperature numerical value indicated; And after single-chip microcomputer utilizes CAN bus SAE J1939 communication protocol to obtain the engine oil pressure data by CAN bus communication interface circuit from Engine ECU report data at every turn, promptly inquiry obtains the PWM pulsewidth parameter that Single-chip Controlling is exported from " oil pressure is reported data-PWM pulsewidth parameter " related table, this pwm signal is transformed to the drive voltage signal of regulating the oil pressure gauge coil current through fuel injection pressure signal conversion driving circuit, deliver to the signal input part of oil pressure gauge again, realize the tram pointer indication of current oil pressure value; If oil pressure numerical value is crossed and low then crossed low pilot lamp control circuit control oil pressure by oil pressure and cross the low pilot lamp flicker indication of reporting to the police; Utilize CAN bus SAE J1939 communication protocol to report the data from Engine ECU for each single-chip microcomputer at every turn and obtain engine speed data by CAN bus communication interface circuit, then suitable flywheel teeth numerical value K according to this model instrument, rotary speed data is changed into the pulse signal output of corresponding frequencies, again after tach signal translation circuit change in polarity, deliver to the signal input part of engine speed instrument, realize correct rotating speed position indicator pointer indication.
The present invention utilizes it to receive the engine water temperature that Engine ECU is reported, data such as oil pressure and rotating speed, these data processing are converted to water-thermometer in the electromagnetic type combination instrument later on respectively, the drive signal of oil pressure gauge and engine speed indicator, allow the electromagnetic type combination instrument indicate automobile engine water temperature exactly, real-time status such as oil pressure and rotating speed data, and cross low pilot lamp flicker alarm control signal when low oil pressure provides oil pressure during to alarming value, the too high pilot lamp flicker of water temperature alarm control signal when being higher than alarming value, water temperature then is provided, and then the engine water temperature sensor that need install of alternative electromagnetic type combination instrument, oil pressure sensor and speed probe overcome the defective that they exist.
Compare with three kinds of replaced sensors, structure of the present invention is small and exquisite, cost is lower, measurement data is more accurate, convenient for installation and maintenance, failure rate is extremely low, does not simultaneously need to change the original circuit structure and the mode of connection of electromagnetic type combination instrument, advantage is extremely obvious.
Description of drawings:
Fig. 1 is a theory structure synoptic diagram of the present invention.
1 to cross low pilot lamp control circuit, 8 for fuel injection pressure signal conversion driving circuit, 7 for oil pressure for the too high pilot lamp control circuit of water temperature, 6 for water temperature signal conversion driving circuit, 5 for tach signal translation circuit, 4 for CAN bus communication interface circuit, 3 for single-chip microcomputer, 2 be power circuit among the figure.
Embodiment
Provide most preferred embodiment of the present invention below in conjunction with accompanying drawing:
The present invention crosses low pilot lamp control circuit 7 by single-chip microcomputer 1, CAN bus communication interface circuit 2, tach signal translation circuit 3, water temperature signal conversion driving circuit 4, the too high pilot lamp control circuit 5 of water temperature, fuel injection pressure signal conversion driving circuit 6, oil pressure and power circuit 8 is formed.
Power circuit 8 adopts switching power source chip such as LM2576HVS, vehicle power supply voltage be converted into the device need of work+the 5V burning voltage, be other funtion parts power supplies; Single-chip microcomputer 1 is selected automotive grade, cheap and single-chip microcomputer with one road CAN communication function and four road pwm signal output functions for use, as PIC18F2580; CAN bus communication interface circuit 2 adopts CAN bus transceiver chip such as TJA1040, realizes the CAN bus of single-chip microcomputer 1 and being connected of engine CAN bus communication interface; Adopt 60V withstand voltage NPN type triode (as 2SC1815) that the reflection rotational speed pulse signal (pwm signal of dutycycle 50%) of the PWM port output of single-chip microcomputer 1 is amplified conversion in the tach signal translation circuit 3, be connected to the signal input part of the engine speed indicator in the automobile combination meter again, the frequency of this pulse signal (perhaps pwm signal cycle) is determined jointly by the flywheel number of teeth K that engine speed data and tachometer gage are suitable for; Water temperature signal conversion driving circuit 4 adopts processing such as resistance capacitance secondary smothing filtering, operational amplifier (as LM324) amplification and pliotron (as TIP42) driving successively, the pwm signal of the reflection water temperature of single-chip microcomputer 1 output is converted to 0～24V(is applicable to truck or passenger vehicle instrument) voltage drive signals, deliver to the input end of electromagnetic water thermometer signal, regulate the electric current of one of them coil, realize the accurate indication of water-thermometer pointer position; Fuel injection pressure signal conversion driving circuit 6 adopts processing such as resistance capacitance smothing filtering, operational amplifier (as LM324) amplification and pliotron (as TIP42) driving equally successively, the pwm signal of the reflection oil pressure of single-chip microcomputer 1 output is converted to 0～24V(is applicable to truck or passenger vehicle instrument) voltage drive signals, deliver to the signal input part of electromagnetic type oil pressure gauge, regulate the electric current of one of them coil, realize the accurate indication of oil pressure gauge pointer position.Too high pilot lamp control circuit 5 of water temperature and oil pressure are crossed low pilot lamp control circuit 7 and are adopted the withstand voltage NPN type of 60V triode (as 2SC1815) respectively, they cross low pilot lamp with too high pilot lamp of water temperature and oil pressure that open-collector mode connects in the electromagnetic type combination instrument, adopt negative control.
In the control program of single-chip microcomputer 1, at first need set up " water temperature report data-PWM pulsewidth parameter " and " oil pressure is reported data-PWM pulsewidth parameter " at the electromagnetic meter of concrete model respectively and concern corresponding form, solve the non-linear position indication problem of electromagnetic meter pointer; Promptly become the whole range area dividing of dial plate several position indication points (such as 256 indication points, the many more pointer indications of indication point quantity are accurate more), the corresponding pointer position driving voltage of the designation data of each position indication point (data of engine report just), the pwm signal pulse-width data of a then corresponding single-chip microcomputer 1 output of this voltage; When single-chip microcomputer 1 utilizes SAE J1939 agreement when CAN bus communication interface circuit 2 obtains water temperature data that Engine ECU report or oil pressure data at every turn, promptly the corresponding related table of inquiry obtains PWM pulsewidth parameter, export this pwm signal by single-chip microcomputer 1 corresponding PWM port again, handle the drive voltage signal that obtains instrument through water temperature signal conversion driving circuit 4 or fuel injection pressure signal conversion driving circuit 6, the pointer of the corresponding instrument of output control is realized correct position indication.And the engine oil pressure data that the engine water temperature data that receive when single-chip microcomputer 1 are higher than alarming threshold value or reception are during less than alarming threshold value, then export the 1Hz pulse signal and cross corresponding pilot lamp in the low pilot lamp control circuit 7 control electromagnetic type combination instruments with the indication of reporting to the police of flicker form by too high pilot lamp control circuit 5 of water temperature or oil pressure.
Pointer indicating position control for engine speed indicator, the program of single-chip microcomputer 1 needs at first to determine the flywheel teeth logarithmic data K value that engine speed indicator is suitable in the concrete model electromagnetic type combination instrument (is that ZB258 electromagnetic type combination instrument K value relatively more commonly used is 119 such as model), utilizes the K value and receives the indicating positions that pointer is determined in the common computing of engine speed data.When single-chip microcomputer 1 utilizes SAE J1939 agreement when CAN bus communication interface circuit 2 obtains engine speed data that Engine ECU report at every turn, export by the PWM port through the pwm pulse signal (dutycycle 50%) that changes corresponding frequencies after the k-factor processing into, again after tach signal translation circuit 3 change in polarity, deliver to the signal input part of engine speed instrument, realize correct rotating speed pointer position indication.
This device can be integrated in the small and exquisite aluminium section box, except two circumscripted power lines, two order wires connect engine CAN bus, three instrument drive control lines are connected the original connection terminal of combination instrument with two pilot lamp control lines, the mode of connection does not need to change original automobile combination meter circuit structure and is connected mode of connection, has advantages such as reliability height, cost be low, convenient for installation and maintenance.
Claims (2)
1. utilize motor car engine to report the device of data-driven electromagnetic type combination instrument, it is characterized in that, comprise single-chip microcomputer (1), CAN bus communication interface circuit (2), tach signal translation circuit (3), water temperature signal conversion driving circuit (4), the too high pilot lamp control circuit of water temperature (5), fuel injection pressure signal conversion driving circuit (6), oil pressure is crossed low pilot lamp control circuit (7) and power circuit (8), single-chip microcomputer (1) is connected with engine CAN bus communication interface through CAN bus communication interface circuit (2), the signal input part of single-chip microcomputer (1) engine speed indicator in tach signal translation circuit (3) connection electromagnetic type combination instrument, the signal input part of single-chip microcomputer (1) water-thermometer in water temperature signal conversion driving circuit (4) connection electromagnetic type combination instrument, the signal input part of single-chip microcomputer (1) oil pressure gauge in fuel injection pressure signal conversion driving circuit (6) connection electromagnetic type combination instrument, single-chip microcomputer (1) is the too high alarm lamp of water temperature in the too high pilot lamp control circuit of water temperature (5) control electromagnetic type combination instrument, single-chip microcomputer (1) is crossed in low pilot lamp control circuit (7) the control electromagnetic type combination instrument oil pressure through oil pressure and is crossed low alarm lamp, and power circuit (8) is converted into the working power that device needs to automobile power source.
2. the device that utilizes motor car engine to report data-driven electromagnetic type combination instrument according to claim 1, it is characterized in that, the program of single-chip microcomputer (1) at first need be set up water temperature respectively at the water-thermometer in the electromagnetic type combination instrument of concrete model, oil pressure gauge and report data-PWM pulsewidth parameter, the oil pressure report data-corresponding form of PWM pulsewidth parameters relationship, needs to determine the flywheel teeth numerical value K of the suitable tachometric survey of engine speed indicator in this model instrument simultaneously; After single-chip microcomputer (1) utilizes CAN bus SAE J1939 communication protocol to obtain the engine water temperature data by CAN bus communication interface circuit (2) from Engine ECU report data at every turn, promptly report and inquire about the PWM pulsewidth parameter that obtains single-chip microcomputer (1) control output data-PWM pulsewidth parameters relationship form from water temperature, this pwm signal is transformed to the drive voltage signal of regulating the water-thermometer coil current through water temperature signal conversion driving circuit (4), deliver to the signal input part of water-thermometer again, realize the tram pointer indication of current water temperature value; If too high then the warning by the too high pilot lamp flicker of the too high pilot lamp control circuit of water temperature (5) control water temperature of water temperature numerical value indicated; And after single-chip microcomputer (1) utilizes CAN bus SAE J1939 communication protocol to obtain the engine oil pressure data by CAN bus communication interface circuit (2) from Engine ECU report data at every turn, promptly report and inquire about the PWM pulsewidth parameter that obtains single-chip microcomputer (1) control output data-PWM pulsewidth parameters relationship form from oil pressure, this pwm signal is transformed to the drive voltage signal of regulating the oil pressure gauge coil current through fuel injection pressure signal conversion driving circuit (6), deliver to the signal input part of oil pressure gauge again, realize the tram pointer indication of current oil pressure value; If oil pressure numerical value is crossed and low then crossed low pilot lamp control circuit (7) control oil pressure by oil pressure and cross the low pilot lamp flicker indication of reporting to the police; Utilize CAN bus SAE J1939 communication protocol to report the data from Engine ECU for each single-chip microcomputer (1) at every turn and obtain engine speed data by CAN bus communication interface circuit (2), then suitable flywheel teeth numerical value K according to this model instrument, rotary speed data is changed into the pulse signal output of corresponding frequencies, again after tach signal translation circuit (3) change in polarity, deliver to the signal input part of engine speed instrument, realize correct rotating speed position indicator pointer indication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013101109562A CN103217183A (en) | 2013-04-01 | 2013-04-01 | Device for driving electromagnetic type combination instrument by broadcasting data of automobile engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101109562A CN103217183A (en) | 2013-04-01 | 2013-04-01 | Device for driving electromagnetic type combination instrument by broadcasting data of automobile engine |
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| CN103217183A true CN103217183A (en) | 2013-07-24 |
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| CN2013101109562A Pending CN103217183A (en) | 2013-04-01 | 2013-04-01 | Device for driving electromagnetic type combination instrument by broadcasting data of automobile engine |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040095255A1 (en) * | 2002-11-04 | 2004-05-20 | Hamid Namaky | Data link connector (DLC) driven display |
| CN101149279A (en) * | 2007-11-05 | 2008-03-26 | 山东大学 | Integrated digital sensor matching with automobile combined instrument |
| CN201133286Y (en) * | 2007-12-26 | 2008-10-15 | 陕西汽车集团有限责任公司 | Engine status indication doohickey based on CAN bus |
| CN203274772U (en) * | 2013-04-01 | 2013-11-06 | 山东大学 | Device of using automobile engine broadcast data to drive electromagnetic combination instrument |
-
2013
- 2013-04-01 CN CN2013101109562A patent/CN103217183A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040095255A1 (en) * | 2002-11-04 | 2004-05-20 | Hamid Namaky | Data link connector (DLC) driven display |
| CN101149279A (en) * | 2007-11-05 | 2008-03-26 | 山东大学 | Integrated digital sensor matching with automobile combined instrument |
| CN201133286Y (en) * | 2007-12-26 | 2008-10-15 | 陕西汽车集团有限责任公司 | Engine status indication doohickey based on CAN bus |
| CN203274772U (en) * | 2013-04-01 | 2013-11-06 | 山东大学 | Device of using automobile engine broadcast data to drive electromagnetic combination instrument |
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Application publication date: 20130724 |