CN105466616A - DC electric dynamometering system based on voltage protection circuit - Google Patents
DC electric dynamometering system based on voltage protection circuit Download PDFInfo
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- CN105466616A CN105466616A CN201510815738.8A CN201510815738A CN105466616A CN 105466616 A CN105466616 A CN 105466616A CN 201510815738 A CN201510815738 A CN 201510815738A CN 105466616 A CN105466616 A CN 105466616A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
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Abstract
The invention discloses a DC electric dynamometering system based on a voltage protection circuit. The DC electric dynamometering system includes a to-be-detected engine, a water temperature constant temperature control unit, an engine oil constant temperature control unit, a fuel oil constant temperature control unit, an intelligent oil consumption instrument, a torque sensor, a DC electric dynamometer, a DCS speed regulator, a control unit, a power supply processing unit, a power grid, a voltage protection circuit, a power analyzer and a computer system. The voltage protection circuit is adopted for protection. Power can be cut off timely once a short circuit phenomenon occurs in the system, so the system is prevented from being damaged by high voltages.
Description
Technical field
The present invention relates to mechanical test system regions, specifically refer to a kind of direct current power power-measuring system based on voltage protection circuit.
Background technology
Engine Dynamic Performance test is the necessary means of measured engine power performance and economic performance.Engine rig test equipment is as the requisite equipment of performance test, can its level height directly have influence on the performance that reflect engine strictly according to the facts, whether the foundation of engine design and improvement can be provided, therefore, it occupy very important position in the raising of the Performance and quality of engine.Dynamometer machine, as the core of engine rig test equipment, plays a part very important wherein.But the hydraulic dynamometer that tradition uses is mainly used in testing high-power engine, its precision measured is low, measuring process operating difficulties; And the power-measuring system that electric eddy current dynamometer and electric A.C. dynamometer form is all very expensive, its price to millions of, and can not record data at hundreds of thousands in time, brings significant limitation to engine performance measuring.In order to solve the problem, the direct current power power-measuring system occurred on the market at present.But existing direct current power power-measuring system cannot well be protected himself when there is the superpotential such as short circuit, therefore it is subject to superpotential damage.
Summary of the invention
The object of the invention is to overcome the defect that existing direct current power power-measuring system cannot well be protected himself when there is the superpotential such as short circuit, a kind of direct current power power-measuring system based on voltage protection circuit is provided.
Object of the present invention is achieved through the following technical solutions: a kind of direct current power power-measuring system based on voltage protection circuit, by tested engine, the water temperature temperature control unit be connected with tested engine, machine oil temperature control unit, fuel oil constant-temperature control module, Intelligent Fuel Consumption Instrument and torque sensor, by the electric DC dynamometer that shaft coupling is connected with tested engine, the DCS speed regulator be connected with electric DC dynamometer, the control module be connected with DCS speed regulator and voltage protection circuit, the power supply processing unit be connected with voltage protection circuit, the electrical network be connected with power supply processing unit, the power analyzer be connected with torque sensor, and respectively with water temperature temperature control unit, machine oil temperature control unit, fuel oil constant-temperature control module, Intelligent Fuel Consumption Instrument, the computer system composition that power analyzer is connected with control module, described voltage protection circuit is by amplifier P1, triode VT2, field effect transistor MOS1, field effect transistor MOS2, field effect transistor MOS3, be serially connected in the diode D5 between the source electrode of field effect transistor MOS1 and drain electrode, be serially connected in the diode D6 between the source electrode of field effect transistor MOS2 and drain electrode, P pole is connected with the drain electrode of field effect transistor MOS2, the diode D7 that N pole is then connected with the positive pole of amplifier P1 after resistance R9, N pole is connected with the emitter of triode VT2, the diode D8 that P pole is then connected with the negative pole of amplifier P1, positive pole is connected with the negative pole of amplifier P1, the electric capacity C7 of minus earth, and the diode D9 be serially connected between the source electrode of field effect transistor MOS3 and drain electrode forms, the source electrode of described field effect transistor MOS1 forms the input end of this voltage protection circuit together with the grid of field effect transistor MOS3, and its grid is then connected with the drain electrode of field effect transistor MOS3, and its drain electrode is then connected with the drain electrode of field effect transistor MOS2, the described base stage of triode VT2 is connected with the grid of field effect transistor MOS2, and its collector is then connected with the source electrode of field effect transistor MOS2, the described output terminal of amplifier P1 is connected with the drain electrode of field effect transistor MOS3, and its positive pole is then connected with the grid of field effect transistor MOS2, and its negative pole then forms the output terminal of this voltage protection circuit together with the source electrode of field effect transistor MOS2, the input end of described voltage protection circuit is connected with the output terminal of power supply processing unit, its output terminal is then connected with DCS speed regulator.
Described power supply processing unit is by transformer T, be arranged on telefault L1 and the telefault L2 on the former limit of transformer T, be arranged on the telefault L3 of transformer T secondary, the former limit circuit be simultaneously connected with telefault L2 with telefault L1, the current rectifying and wave filtering circuit be connected with former limit circuit input end and driving circuit, and the output circuit be connected with telefault L3 forms.
Described current rectifying and wave filtering circuit comprises diode rectifier U, resistance R1 and electric capacity C1; The positive pole of described electric capacity C1 is connected with the cathode output end of diode rectifier U after resistance R1, its minus earth, and two input poles of described diode rectifier U form input end, its cathode output end then ground connection of this power supply processing unit together; The positive pole of described electric capacity C1 is also connected with former limit circuit; The input end of described power supply processing unit is connected with electrical network.
Described driving circuit is by driving chip U1, triode VT1, field effect transistor MOS, positive pole is connected with the VREF pin of driving chip U1 after resistance R5, the electric capacity C4 of minus earth, positive pole is connected with the SS pin of driving chip U1, the electric capacity C3 that negative pole is then connected with the negative pole of electric capacity C4, be serially connected in the resistance R4 between the FB pin of driving chip U1 and the negative pole of electric capacity C4, positive pole is connected with the positive pole of electric capacity C1 after resistance R2, the electric capacity C5 of ground connection while negative pole is connected with the GND pin of driving chip U1, one end is connected with the OUT pin of driving chip U1, the resistance R6 that the other end is then connected with the grid of field effect transistor MOS, the diode D2 be in parallel with resistance R6, one end is connected with the source electrode of field effect transistor MOS, the resistance R7 of other end ground connection forms, the RVC pin of described driving chip U1 is connected with the positive pole of electric capacity C4, and its IS pin is then connected with the base stage of triode VT1, and its VCC pin is then connected with the positive pole of electric capacity C5, the described collector of triode VT1 is connected with the source electrode of field effect transistor MOS, its grounded emitter, the drain electrode of described field effect transistor MOS is then connected with former limit circuit.
Described former limit circuit comprises resistance R3, resistance R8, electric capacity C2, diode D1 and diode D3; The P pole of described diode D3 is connected with the drain electrode of field effect transistor MOS, its N pole is connected with the positive pole of electric capacity C1 after resistance R3, electric capacity C2 is then in parallel with resistance R3, and the N pole of diode D1 is connected with the positive pole of electric capacity C5, its P pole is then connected with the non-same polarity of telefault L2 after resistance R8; The Same Name of Ends of described telefault L1 is connected with the positive pole of electric capacity C1, its non-same polarity is then connected with the Same Name of Ends of telefault L2.
Described output circuit comprises diode D4 and electric capacity C6; The P pole of described diode D4 is connected with the non-same polarity of telefault L3, its N pole is then connected with the grid of field effect transistor MOS3; The described Same Name of Ends of telefault L3 is connected with the source electrode of field effect transistor MOS1; The positive pole of described electric capacity C6 is connected with the Same Name of Ends of telefault L3, and its negative pole is then connected with the N pole of diode D4.
Described driving chip U1 is FAN7554 integrated chip.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention adopts electric DC dynamometer to load, and it is applicable to test high-power and low power engine, expands its range of application.
(2) the present invention adopts four-quadrant control technology, by the back electrical energy electrical network that motor absorbs, for other equipment use, can play the performance of motor to greatest extent, and economize energy.
(3) the present invention adopts computer technology and digital control technology to control, and improves the automaticity of equipment, also improves the control accuracy of equipment and measuring accuracy and equipment reliability of operation and stability simultaneously.
(4) the power-measuring system cost that the present invention is more traditional is more cheap, is only 70% of traditional power-measuring system.
(5) the present invention adopts voltage protection circuit to protect it, can deenergization timely when there is the existing picture of short circuit in system, avoids the present invention to be subject to high voltage and damages.
Accompanying drawing explanation
Fig. 1 is one-piece construction block diagram of the present invention.
Fig. 2 is the circuit structure diagram of power supply processing unit of the present invention.
Fig. 3 is the circuit structure diagram of voltage protection circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, the direct current power power-measuring system based on voltage protection circuit of the present invention, by tested engine; water temperature temperature control unit, machine oil temperature control unit, fuel oil constant-temperature control module; Intelligent Fuel Consumption Instrument, torque sensor, electric DC dynamometer; DCS speed regulator; control module, power supply processing unit, electrical network; voltage protection circuit, power analyzer and computer system 14 part composition.
During work, electric DC dynamometer is connected with tested engine by shaft coupling, and it is for loading tested engine.DCS speed regulator is then connected with electric DC dynamometer, and voltage protection circuit and control module are then connected with DCS speed regulator respectively, and power supply processing unit is then connected with voltage protection circuit, and electrical network is then connected with power supply processing unit.Wherein, electrical network is used for providing power supply to whole power-measuring system.Power supply processing unit is then for processing line voltage, its structure as shown in Figure 2, by transformer T, be arranged on telefault L1 and the telefault L2 on the former limit of transformer T, be arranged on the telefault L3 of transformer T secondary, the former limit circuit be simultaneously connected with telefault L2 with telefault L1, the current rectifying and wave filtering circuit be connected with former limit circuit output end and driving circuit, and the output circuit be connected with telefault L3 forms.
Described current rectifying and wave filtering circuit can be converted to smooth-going direct current line voltage, and it comprises diode rectifier U, resistance R1 and electric capacity C1.The positive pole of described electric capacity C1 is connected with the cathode output end of diode rectifier U after resistance R1, its minus earth, and two input poles of described diode rectifier U form input end, its cathode output end then ground connection of this power supply processing unit together; The positive pole of described electric capacity C1 is also connected with former limit circuit; The input end of described power supply processing unit is connected with electrical network.
Described driving circuit is by driving chip U1, triode VT1, field effect transistor MOS, positive pole is connected with the VREF pin of driving chip U1 after resistance R5, the electric capacity C4 of minus earth, positive pole is connected with the SS pin of driving chip U1, the electric capacity C3 that negative pole is then connected with the negative pole of electric capacity C4, be serially connected in the resistance R4 between the FB pin of driving chip U1 and the negative pole of electric capacity C4, positive pole is connected with the positive pole of electric capacity C1 after resistance R2, the electric capacity C5 of ground connection while negative pole is connected with the GND pin of driving chip U1, one end is connected with the OUT pin of driving chip U1, the resistance R6 that the other end is then connected with the grid of field effect transistor MOS, the diode D2 be in parallel with resistance R6, one end is connected with the source electrode of field effect transistor MOS, the resistance R7 of other end ground connection forms.
Meanwhile, the RVC pin of this driving chip U1 is connected with the positive pole of electric capacity C4, and its IS pin is then connected with the base stage of triode VT1, and its VCC pin is then connected with the positive pole of electric capacity C5; The described collector of triode VT1 is connected with the source electrode of field effect transistor MOS, its grounded emitter.The drain electrode of described field effect transistor MOS is then connected with former limit circuit.In order to reach better implementation result, described driving chip U1 preferentially selects FAN7554 integrated chip to realize.
Described former limit circuit comprises resistance R3, resistance R8, electric capacity C2, diode D1 and diode D3.During connection, the P pole of described diode D3 is connected with the drain electrode of field effect transistor MOS, its N pole is connected with the positive pole of electric capacity C1 after resistance R3, electric capacity C2 is then in parallel with resistance R3, and the N pole of diode D1 is connected with the positive pole of electric capacity C5, its P pole is then connected with the non-same polarity of telefault L2 after resistance R8.The Same Name of Ends of described telefault L1 is connected with the positive pole of electric capacity C1, its non-same polarity is then connected with the Same Name of Ends of telefault L2.The direct current exported from former limit circuit exports to output circuit after transformer T transformation.
Described output circuit comprises diode D4 and electric capacity C6.The P pole of described diode D4 is connected with the non-same polarity of telefault L3, its N pole then forms the output terminal of this power supply processing unit jointly with the Same Name of Ends of telefault L3.The positive pole of described electric capacity C6 is connected with the Same Name of Ends of telefault L3, and its negative pole is then connected with the N pole of diode D4.The output terminal of this power supply processing unit is connected with the input end of voltage protection circuit.
Further, voltage protection circuit is used for protecting power-measuring system, and when there is short circuit in system, it can at very first time deenergization, and it is connected with DCS speed regulator with power supply processing unit respectively.As shown in Figure 3, it comprises amplifier P1 to the structure of this voltage protection circuit, triode VT2, field effect transistor MOS1, field effect transistor MOS2, field effect transistor MOS3, diode D5, diode D6, triode D7, diode D8, triode D9, resistance R9 and electric capacity C7.
During switching, diode D5 is serially connected between the source electrode of field effect transistor MOS1 and drain electrode, diode D6 is then serially connected between the source electrode of field effect transistor MOS2 and drain electrode, the P pole of diode D7 is connected with the drain electrode of field effect transistor MOS2, its N pole is then connected with the positive pole of amplifier P1 after resistance R9, the N pole of diode D8 is connected with the emitter of triode VT2, its P pole is then connected with the negative pole of amplifier P1, the positive pole of electric capacity C7 is connected with the negative pole of amplifier P1, its minus earth, and diode D9 is then serially connected between the source electrode of field effect transistor MOS3 and drain electrode.
Meanwhile, the source electrode of described field effect transistor MOS1 is connected with the Same Name of Ends of telefault L3, and its grid is then connected with the drain electrode of field effect transistor MOS3, and its drain electrode is then connected with the drain electrode of field effect transistor MOS2.The grid of described field effect transistor MOS3 is connected with the N pole of diode D4.The described base stage of triode VT2 is connected with the grid of field effect transistor MOS2, and its collector is then connected with the source electrode of field effect transistor MOS2.The described output terminal of amplifier P1 is connected with the drain electrode of field effect transistor MOS3; its positive pole is then connected with the grid of field effect transistor MOS2; its negative pole then forms the output terminal of this voltage protection circuit together with the source electrode of field effect transistor MOS2, and the output terminal of this voltage protection circuit is connected with DCS speed regulator.When voltage being raised when there is short circuit in power-measuring system, field effect transistor MOS1, field effect transistor MOS2 and field effect transistor MOS3 then can end, thus disconnect the power supply of power-measuring system.
Operationally, voltage flows to electric DC dynamometer after DCS speed regulator, and controlled the rotating speed of electric DC dynamometer by DCS speed regulator, electric DC dynamometer then drives tested engine operation.This electric DC dynamometer can also be converted to direct current the mechanical energy that tested engine transmits, the DC inverter that DCS speed regulator then can send electric dynamometer is that alternating current feeds back to electrical network for miscellaneous equipment, so then the present invention can be made to add energy-conservation.
In addition, water temperature temperature control unit, machine oil temperature control unit and fuel oil constant-temperature control module then form the protection system of tested engine, it is connected with tested engine, for protecting tested engine, it can make the water temperature of tested engine, machine oil and fuel oil maintain steady state value respectively; Meanwhile, water temperature temperature control unit, machine oil temperature control unit and fuel oil constant-temperature control module are controlled by computer system, and therefore they are also connected with computer system respectively.
Intelligent Fuel Consumption Instrument is then connected with tested engine and computer system respectively, and it for measuring the oil consumption of tested engine, and is transferred to computer system metrical information.Torque sensor is then connected with tested engine, and power analyzer is then connected with torque sensor, and computer system is also connected with control module with power analyzer respectively.This torque sensor for gathering the torque signal of tested engine, and is transferred to power analyzer, and it can be preferably strain-type torque sensor to realize.Power analyzer then calculates the output power of tested engine according to torque signal and is transferred to computer system, its WT3000 type power analyzer can preferentially selecting the dynamo-electric science and technology of Japanese Yokogawa to produce realizes, this model power analyzer data-handling capacity is powerful, corresponding speed fast, can well guarantee reliability and the promptness of test data.
Control module is then for control DCS speed regulator; Computer system is then as control center of the present invention and signal transacting center, and tester can be controlled power-measuring system by computer system, and understands the real-time status of tested engine, and therefore this computer system is also as the window of human-computer exchange.In addition, this water temperature temperature control unit, machine oil temperature control unit, fuel oil constant-temperature control module, Intelligent Fuel Consumption Instrument, electric DC dynamometer, DCS speed regulator and control module all adopt prior art to realize.
As mentioned above, just well the present invention can be implemented.
Claims (7)
1. the direct current power power-measuring system based on voltage protection circuit, it is characterized in that, by tested engine, the water temperature temperature control unit be all connected with tested engine, machine oil temperature control unit, fuel oil constant-temperature control module, Intelligent Fuel Consumption Instrument and torque sensor, by the electric DC dynamometer that shaft coupling is connected with tested engine, the DCS speed regulator be connected with electric DC dynamometer, the control module be all connected with DCS speed regulator and voltage protection circuit, the power supply processing unit be connected with voltage protection circuit, the electrical network be connected with power supply processing unit, the power analyzer be connected with torque sensor, and respectively with water temperature temperature control unit, machine oil temperature control unit, fuel oil constant-temperature control module, Intelligent Fuel Consumption Instrument, the computer system composition that power analyzer is connected with control module, described voltage protection circuit is by amplifier P1, triode VT2, field effect transistor MOS1, field effect transistor MOS2, field effect transistor MOS3, be serially connected in the diode D5 between the source electrode of field effect transistor MOS1 and drain electrode, be serially connected in the diode D6 between the source electrode of field effect transistor MOS2 and drain electrode, P pole is connected with the drain electrode of field effect transistor MOS2, the diode D7 that N pole is then connected with the positive pole of amplifier P1 after resistance R9, N pole is connected with the emitter of triode VT2, the diode D8 that P pole is then connected with the negative pole of amplifier P1, positive pole is connected with the negative pole of amplifier P1, the electric capacity C7 of minus earth, and the diode D9 be serially connected between the source electrode of field effect transistor MOS3 and drain electrode forms, the source electrode of described field effect transistor MOS1 forms the input end of this voltage protection circuit together with the grid of field effect transistor MOS3, and its grid is then connected with the drain electrode of field effect transistor MOS3, and its drain electrode is then connected with the drain electrode of field effect transistor MOS2, the described base stage of triode VT2 is connected with the grid of field effect transistor MOS2, and its collector is then connected with the source electrode of field effect transistor MOS2, the described output terminal of amplifier P1 is connected with the drain electrode of field effect transistor MOS3, and its positive pole is then connected with the grid of field effect transistor MOS2, and its negative pole then forms the output terminal of this voltage protection circuit together with the source electrode of field effect transistor MOS2, the input end of described voltage protection circuit is connected with the output terminal of power supply processing unit, its output terminal is then connected with DCS speed regulator.
2. a kind of direct current power power-measuring system based on voltage protection circuit according to claim 1; it is characterized in that: described power supply processing unit is by transformer T; be arranged on telefault L1 and the telefault L2 on the former limit of transformer T; be arranged on the telefault L3 of transformer T secondary; the former limit circuit be simultaneously connected with telefault L2 with telefault L1; the current rectifying and wave filtering circuit be connected with former limit circuit input end and driving circuit, and the output circuit be connected with telefault L3 forms.
3. a kind of direct current power power-measuring system based on voltage protection circuit according to claim 2, is characterized in that: described current rectifying and wave filtering circuit comprises diode rectifier U, resistance R1 and electric capacity C1; The positive pole of described electric capacity C1 is connected with the cathode output end of diode rectifier U after resistance R1, its minus earth, and two input poles of described diode rectifier U form input end, its cathode output end then ground connection of this power supply processing unit together; The positive pole of described electric capacity C1 is also connected with former limit circuit; The input end of described power supply processing unit is connected with electrical network.
4. a kind of direct current power power-measuring system based on voltage protection circuit according to claim 3, it is characterized in that: described driving circuit is by driving chip U1, triode VT1, field effect transistor MOS, positive pole is connected with the VREF pin of driving chip U1 after resistance R5, the electric capacity C4 of minus earth, positive pole is connected with the SS pin of driving chip U1, the electric capacity C3 that negative pole is then connected with the negative pole of electric capacity C4, be serially connected in the resistance R4 between the FB pin of driving chip U1 and the negative pole of electric capacity C4, positive pole is connected with the positive pole of electric capacity C1 after resistance R2, the electric capacity C5 of ground connection while negative pole is connected with the GND pin of driving chip U1, one end is connected with the OUT pin of driving chip U1, the resistance R6 that the other end is then connected with the grid of field effect transistor MOS, the diode D2 be in parallel with resistance R6, one end is connected with the source electrode of field effect transistor MOS, the resistance R7 of other end ground connection forms, the RVC pin of described driving chip U1 is connected with the positive pole of electric capacity C4, and its IS pin is then connected with the base stage of triode VT1, and its VCC pin is then connected with the positive pole of electric capacity C5, the described collector of triode VT1 is connected with the source electrode of field effect transistor MOS, its grounded emitter, the drain electrode of described field effect transistor MOS is then connected with former limit circuit.
5. a kind of direct current power power-measuring system based on voltage protection circuit according to claim 4, is characterized in that: described former limit circuit comprises resistance R3, resistance R8, electric capacity C2, diode D1 and diode D3; The P pole of described diode D3 is connected with the drain electrode of field effect transistor MOS, its N pole is connected with the positive pole of electric capacity C1 after resistance R3, electric capacity C2 is then in parallel with resistance R3, and the N pole of diode D1 is connected with the positive pole of electric capacity C5, its P pole is then connected with the non-same polarity of telefault L2 after resistance R8; The Same Name of Ends of described telefault L1 is connected with the positive pole of electric capacity C1, its non-same polarity is then connected with the Same Name of Ends of telefault L2.
6. a kind of direct current power power-measuring system based on voltage protection circuit according to claim 5, is characterized in that: described output circuit comprises diode D4 and electric capacity C6; The P pole of described diode D4 is connected with the non-same polarity of telefault L3, its N pole is then connected with the grid of field effect transistor MOS3; The described Same Name of Ends of telefault L3 is connected with the source electrode of field effect transistor MOS1; The positive pole of described electric capacity C6 is connected with the Same Name of Ends of telefault L3, and its negative pole is then connected with the N pole of diode D4.
7. a kind of direct current power power-measuring system based on voltage protection circuit according to claim 6, is characterized in that: described driving chip U1 is FAN7554 integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510815738.8A CN105466616A (en) | 2015-11-20 | 2015-11-20 | DC electric dynamometering system based on voltage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510815738.8A CN105466616A (en) | 2015-11-20 | 2015-11-20 | DC electric dynamometering system based on voltage protection circuit |
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| CN105466616A true CN105466616A (en) | 2016-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510815738.8A Withdrawn CN105466616A (en) | 2015-11-20 | 2015-11-20 | DC electric dynamometering system based on voltage protection circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4327578A (en) * | 1979-12-19 | 1982-05-04 | Horiba Instruments Incorporated | Dynamometer |
| JPH06261577A (en) * | 1993-03-08 | 1994-09-16 | Meidensha Corp | Control circuit of dc machine |
| CN1290856A (en) * | 2000-11-09 | 2001-04-11 | 常柴股份有限公司 | Measurement of engine mechanical efficiency and back drawing test system |
| CN1587937A (en) * | 2004-09-28 | 2005-03-02 | 十堰市海泱科技有限公司 | Direct current power ergometer and its control system |
| CN202405881U (en) * | 2011-10-14 | 2012-08-29 | 西北工业大学 | Super capacitor energy storing device |
-
2015
- 2015-11-20 CN CN201510815738.8A patent/CN105466616A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4327578A (en) * | 1979-12-19 | 1982-05-04 | Horiba Instruments Incorporated | Dynamometer |
| JPH06261577A (en) * | 1993-03-08 | 1994-09-16 | Meidensha Corp | Control circuit of dc machine |
| CN1290856A (en) * | 2000-11-09 | 2001-04-11 | 常柴股份有限公司 | Measurement of engine mechanical efficiency and back drawing test system |
| CN1587937A (en) * | 2004-09-28 | 2005-03-02 | 十堰市海泱科技有限公司 | Direct current power ergometer and its control system |
| CN202405881U (en) * | 2011-10-14 | 2012-08-29 | 西北工业大学 | Super capacitor energy storing device |
Non-Patent Citations (1)
| Title |
|---|
| 陈庭勋，楼然苗编: "《智能仪器原理及设计技术》", 30 September 2013, 浙江大学出版社 * |
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Application publication date: 20160406 |
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| WW01 | Invention patent application withdrawn after publication |