CN201352107Y - Air suspension bus body height detecting system - Google Patents
Air suspension bus body height detecting system Download PDFInfo
- Publication number
- CN201352107Y CN201352107Y CNU2008201866798U CN200820186679U CN201352107Y CN 201352107 Y CN201352107 Y CN 201352107Y CN U2008201866798 U CNU2008201866798 U CN U2008201866798U CN 200820186679 U CN200820186679 U CN 200820186679U CN 201352107 Y CN201352107 Y CN 201352107Y
- Authority
- CN
- China
- Prior art keywords
- height
- pin
- coil
- operational amplifier
- height sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000725 suspension Substances 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 6
- 230000001939 inductive effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Landscapes
- Vehicle Body Suspensions (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model discloses an air suspension bus body height detecting system. A height sensor is installed between a frame and an axle and fixed at one end of a swing link. The other end of the swing link is movably connected with a connecting link. The other end of the connecting link is fixed on the axle. The height sensor comprises a coil and a core which can move upward and downward in the coil. The coil is connected with a detecting circuit. Through turning the angle of the swing link, the utility model has the advantages that the core in the sensor frequently moves in the coil to change the inductance, the height is detected, the single chip microcomputer controls the analog switch to charge and discharge the inductor of the height sensor, the single chip microcomputer acquires the signal to obtain the output value of the height sensor, the temperature drift can be compensated in time, the provided height information is accurate and the requirement on the bus height detection can be fully satisfied.
Description
Technical Field
The utility model relates to an air suspension passenger train automobile body height detecting system, the more specifically system that can compensate temperature drift, accurate measurement automobile body altitude variation value that says so.
Background
Body height is one of the most important information in air suspension control systems. The height of a vehicle body, the air charging and discharging of an air spring, the height switching and the like need to be detected in real time in the control process of the air suspension passenger vehicle, all the conditions need to be based on accurate height information of the vehicle body, but the running environment of the vehicle is complex, particularly the change of the ambient temperature, the error of height detection is increased due to the change of parameters of electronic elements of a hardware circuit, and the factors can cause the suspension control to deviate from an ideal state and are not beneficial to the control of the air suspension passenger vehicle. At present, the deviation of an output signal is mainly compensated by software through a temperature sensor, so that the manufacturing cost of the controller is increased, and the temperature change of a hardness circuit can not be effectively compensated.
Disclosure of Invention
The not enough of detection more than, the utility model provides a height detection system for electronic control air suspension system can compensate temperature drift, provides accurate altitude information for the air suspension controller.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a height sensor is arranged between the frame and the axle, the height sensor is fixed at one end of a swing rod, the other end of the swing rod is movably connected with a connecting rod, and the other end of the connecting rod is fixed on the axle; the height sensor comprises a coil and an iron core which can move up and down in the coil, and the coil is connected with a detection circuit.
The detection circuit comprises a coil and a freewheeling diode D1 which are connected in parallel to the inverting terminal of an operational amplifier IC2, a resistor R3 is connected between the inverting terminal of the operational amplifier IC2 and the output terminal of the operational amplifier IC2, and the output terminal of the operational amplifier IC2 passes through a resistor R6*Connected to the inverting terminal of the operational amplifier IC3, and a resistor R5 connected between the input terminal of the operational amplifier IC3 and the power supply Vcc*The output end of the transistor is connected with the base electrode of a triode Q1, the collector electrode of the transistor is connected with a power supply Vcc1 through a resistor R8, and the emitter electrode of the transistor is connected with a pin 2 of a photoelectric coupler IC 4; a pin 6 at the output end of the photoelectric coupler IC4 is connected with a pin 5 of a Schmidt trigger IC5, and a pin 6 of the Schmidt trigger IC5 outputs a height signal; the resistors R1 and R2 are connected in series and then connected in parallel with the capacitor C1 to be connected between a power supply Vcc and the ground to form a given circuit, and after voltage division, the given circuit is connected to a pin 13 of the analog switch IC1, a pin 11 of the analog switch IC1 is connected with a single chip microcomputer, and a pin 3 of the output end of the analog switch IC1 is connected with the non-inverting end of the operational amplifier IC 2.
The utility model discloses when the automobile body altitude variation, through the pendulumThe rod rotation angle causes the iron core in the sensor to move frequently in the coil, thereby changing the inductance value to achieve height measurement. The analog switch IC1 is controlled by the single chip microcomputer to charge and discharge the inductance L of the height sensor, and the single chip microcomputer is required to capture signals to obtain the output value of the sensor. The utility model discloses a resistance R5*And R6*In order to adjust the resistance, R3 selects the carbon film resistance with negative temperature coefficient, thus the resistance R5 can be adjusted according to actual conditions in the process of debugging the circuit design*、R6*The temperature drift is compensated by the difference, thereby ensuring the accuracy of the measurement of the height of the vehicle body. Under the condition of 28 ℃, the fluctuation range of the height signal is 0.3 mu s, and the error is less than 1%. And when the ambient temperature rises from 28 ℃ to 80 ℃, the fluctuation range of the height signal is 1.5 mu s, and the error is less than 5%. The temperature drift can be compensated immediately, accurate height information is provided, and the requirement on vehicle height detection can be completely met.
Drawings
Fig. 1 is a schematic connection diagram of the present invention;
FIG. 2 is a functional schematic diagram of the height sensor 5 of FIG. 1;
fig. 3 is a hardware circuit connection diagram of the vehicle height detection circuit 8 in fig. 1.
Detailed Description
Fig. 1 is a schematic diagram of the positions of a frame 1, an axle 4 and a height sensor 5 of a passenger car with an air suspension, namely, the detection of the height of a car body is to obtain the relative displacement change of the frame 1 and the axle 4, wherein the inductive height sensor 5 is shown in the principle of fig. 2 and comprises a coil 7 and an iron core 6 which can move up and down in the coil 7. The height sensor 5 is fixed at one end of the swing rod 2, the other end of the swing rod 2 is movably connected with one end of the connecting rod 3, and the other end of the connecting rod 3 is fixed on the axle 4; the coil 7 in the height sensor 5 is connected to a detection circuit 8. Work of whichThe principle is that when the height of a car body changes, the iron core 6 in the sensor is frequently moved in the coil 7 through the rotation angle of the swing rod 2, so that the height measurement is realized by changing the inductance value. The hardware circuit is combined with the controller to detect the time constant of the inductive sensor to obtain the height value of the vehicle, and the assembly mode of the hardware circuit is as shown in figure 3, the inductive sensor is selected and the detection circuit 8 is designed. Resistors R1 and R2 are connected in series and then connected in parallel with a capacitor C1 with a protection function to form a given circuit between a power supply Vcc and the ground, and are connected to a pin 13 of an analog switch IC1 after voltage division, wherein the pin 11 of the singlechip and the analog switch IC1 are connected and controlled, a pin 3 of an output end of the singlechip is connected with a non-inverting end of an operational amplifier IC2, a coil 7 (a dotted frame part in figure 3) of a height sensor 5 and a freewheeling diode D1 are connected in parallel with an inverting end of an operational amplifier IC2, a resistor R3 is connected between the inverting end of the operational amplifier IC2 and the output end of the operational amplifier IC2, and the output end of the operational amplifier IC2 is connected with a resistor*Connected to the inverting terminal of the operational amplifier IC3, and a resistor R5 connected between the input terminal of the operational amplifier IC3 and the power supply Vcc*The output end of the transistor is connected with the base electrode of a triode Q1, the collector electrode of the transistor is connected with a power supply Vcc1 through a resistor R8, the emitter electrode of the transistor is connected with a pin 2 of a photoelectric coupler IC4, a pin 6 of the output end of the photoelectric coupler IC4 is connected with a pin 5 of a Schmidt trigger IC5, and a pin 6 of a Schmidt trigger IC5 outputs a height signal. The working principle is that the analog switch IC1 is controlled by a single chip microcomputer to charge and discharge the coil inductance L of the height sensor 5, and the single chip microcomputer is required to capture signals to obtain the output value of the sensor, wherein a detection circuit is used as a part of an air suspension controller.
Examples
The utility model discloses the control unit of automobile body height detecting system's hardware circuit design is with the system of observing and controling that 8 bit singlechips constitute as the core.
As shown in fig. 3, in the body height detection circuit 8, all operational amplifiers are powered by a positive and negative 9V power supply, and are converted from a 24V passenger car power supply. The standard power source VCC of 5V is divided by resistors R1 and R2. Wherein,
R1：3.3kΩ R2：680Ω R3：1kΩ R4：120Ω R5*：10kΩ
R6*：0Ω R7：22kΩ R8：1.3kΩ R9：10kΩ R10：10kΩ
C1：0.1μF C2：0.1μF
Vcc：5V Vcc1：9V Vcc2：3V V+：+9V V-：-9V
IC1：CD4051 IC2：TL082 IC3：TL082 IC4：6N137 IC5：40106
Q1：9031 D1：1N5024
the working process of the vehicle body height detection system is described in detail as follows: the singlechip CONTROLs the on-off of the analog switch IC1, the height sensor 5 is connected with the inverting terminal of the operational amplifier IC2, the CONTROL terminal is directly connected with the I/O port of the singlechip, the OUTPUT terminal is connected with the port of the singlechip time-base module, and the port is set to be in an input falling edge capturing mode. The working process of the circuit is as follows: in the initial state, the CONTROL terminal is at high level, the pin 3 of the analog switch IC1 is grounded at pin 14, the inductor is not charged, the operational amplifier IC2 outputs a high level signal close to 0V, therefore, the comparator IC3 outputs a high level signal close to 9V, the triode Q1 is turned on, a current of about 6mA flows through the pin 2 at the input terminal of the photoelectric coupler IC4, and as can be seen by the circuit, the pin 6 at the output terminal of the photoelectric coupler IC4 is a low level signal, and the schmitt trigger IC5 outputs a high level signal of 3V. And a photoelectric coupler IC4 and a Schmitt trigger IC5 at the output end complete the conditioning and level conversion of signals. The singlechip is fed with low level at a CONTROL end, a pin 3 and a pin 13 of the analog switch IC1 are connected, the singlechip captures a falling edge signal of an OUTPUT port and starts timing, at the moment, a reverse end of the operational amplifier IC2 generates a voltage signal about 0.85V, the inductor starts to charge, the inductor current starts to rise, when the reverse end of the IC3 is more than 5V, the OUTPUT end of the comparator IC3 is low level, the triode Q1 is cut off, the pin 2 current at the input end of the photoelectric coupler IC4 is basically zero, so that a pin 6 at the OUTPUT end of the IC4 is high level, and a pin 6 at the OUTPUT end of the Schmidt trigger IC5 is low level signal. At the moment, the singlechip captures the falling edge of the signal at the OUTPUT end, and the singlechip finishes timing, so that the charging time of the inductor is calculated. At the same time, a high-level signal is fed in at the input end, so that the inductor freewheels through a freewheeling diode D1 and is ready for the next height measurement. The size difference of the resistors R5 and R6 in the circuit is adjusted to compensate the temperature drift; meanwhile, the internal resistance R4 (the resistance of a copper wire containing an inductance coil) of the sensor is actually measured as a negative temperature coefficient, so that the carbon film resistance with the negative temperature coefficient is also selected as the R3 to compensate the temperature change.
The main part of the detection circuit 8 can be understood as an RL series circuit (height sensor can be equivalently an RL series circuit) under the excitation of a step signal, and the relation between the inductive current and the charging time is
Wherein, ISτ is the charging time constant for the inductor current going to infinity. The voltage rises most rapidly because the inductor current rises most rapidly when t < tau, and the error generated by the voltage comparator IC3 outputting a steep falling edge is minimized if compared with the standard voltage. Therefore, when designing the circuit, it is most suitable to keep the charging time of the inductor within one tau. The inductance value of the height sensor 5 selected in the invention is between 8 and 35mH, and is L/R according to tau, therefore tau is between 67 mu s and 292 mu s, and the clock period of the singlechip is set to be 0.18 mu s, thus the counting value n of the singlechip is between 372 mu s and 1622, if the value of n is large enough, the precision of the singlechip for measuring the charging time can be improved. Therefore, the charging time t should be made smaller than τ and as close to τ as possible, so that t is slightly smaller than τ.
The height sensor 5 is detected by the detection circuit 8, and according to actual measurement, the height sensor 5 rotates by 1 degree in every counterclockwise direction under the condition that the ambient temperature is 28 ℃, the inductive charging time is increased by 4 mu s, and the height of the vehicle body is increased by 4 mm. Under the condition of 28 ℃, the fluctuation range of the height signal is 0.3 mu s, and the error is less than 1%. And when the ambient temperature rises from 28 ℃ to 80 ℃, the fluctuation range of the height signal is 1.5 mu s, the error is less than 5 percent, and the requirement on vehicle height detection can be completely met.
Claims (2)
1. The utility model provides an air suspension passenger train body height detecting system, installs height sensor (5) between frame (1) and axle (4), characterized by: the height sensor (5) is fixed at one end of the swing rod (2), the other end of the swing rod (2) is movably connected with the connecting rod (3), and the other end of the connecting rod (3) is fixed on the axle (4); the height sensor (5) comprises a coil (7) and an iron core (6) which can move up and down in the coil (7), and the coil (7) is connected with a detection circuit (8).
2. The method of claim 1The utility model provides an air suspension passenger train automobile body height detecting system which characterized by: the detection circuit (8) comprises a coil (7) and a freewheeling diode D1 which are connected in parallel to the inverting terminal of an operational amplifier IC2, a resistor R3 is connected between the inverting terminal of the operational amplifier IC2 and the output terminal of the operational amplifier IC2 through a resistor R6*Connected to the inverting terminal of the operational amplifier IC3, and a resistor R5 connected between the input terminal of the operational amplifier IC3 and the power supply Vcc*The output end of the transistor is connected with the base electrode of a triode Q1, the collector electrode of the transistor is connected with a power supply Vcc1 through a resistor R8, and the emitter electrode of the transistor is connected with a pin 2 of a photoelectric coupler IC 4; a pin 6 at the output end of the photoelectric coupler IC4 is connected with a pin 5 of a Schmidt trigger IC5, and a pin 6 of the Schmidt trigger IC5 outputs a height signal; the resistors R1 and R2 are connected in series and then connected in parallel with the capacitor C1 to be connected between a power supply Vcc and the ground to form a given circuit, and after voltage division, the given circuit is connected to a pin 13 of the analog switch IC1, a pin 11 of the analog switch IC1 is connected with a single chip microcomputer, and a pin 3 of the output end of the analog switch IC1 is connected with the non-inverting end of the operational amplifier IC 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201866798U CN201352107Y (en) | 2008-10-24 | 2008-10-24 | Air suspension bus body height detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201866798U CN201352107Y (en) | 2008-10-24 | 2008-10-24 | Air suspension bus body height detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201352107Y true CN201352107Y (en) | 2009-11-25 |
Family
ID=41375495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201866798U Expired - Fee Related CN201352107Y (en) | 2008-10-24 | 2008-10-24 | Air suspension bus body height detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201352107Y (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102049679A (en) * | 2010-11-10 | 2011-05-11 | 大连德新机电技术工程有限公司 | Vehicle height automatic measuring and adjustment device |
| CN104960396A (en) * | 2015-07-08 | 2015-10-07 | 吉林大学 | Whole-vehicle height control method based on electric-control air hanging bracket adopting layered structure |
| CN105157803A (en) * | 2015-09-30 | 2015-12-16 | 李晓刚 | Vehicle load capacitance-type sensor |
| CN108973580A (en) * | 2018-07-30 | 2018-12-11 | 广州市米萨汽车电子科技有限公司 | Electric air pump |
| CN110411356A (en) * | 2019-07-30 | 2019-11-05 | 安徽安凯汽车股份有限公司 | One kind debugging auxiliary system for automobile ECAS |
| CN111486809A (en) * | 2020-05-13 | 2020-08-04 | 安美科(安徽)汽车电驱有限公司 | Detection equipment for height sensor of air suspension system |
| CN111998760A (en) * | 2020-07-07 | 2020-11-27 | 安徽博昕远智能科技有限公司 | Sensor and method for detecting displacement of vehicle body |
| CN112461114A (en) * | 2020-11-12 | 2021-03-09 | 珠海格力电器股份有限公司 | Detection device of inductive sensor, automobile and automobile body height detection method of automobile |
| CN112477542A (en) * | 2020-11-30 | 2021-03-12 | 江苏科技大学 | Three-wire type air suspension vehicle body height sensor and vehicle body height control method |
| CN112477541A (en) * | 2020-11-30 | 2021-03-12 | 江苏科技大学 | Four-wire type air suspension vehicle body height sensor and vehicle body height control method |
| CN112498045A (en) * | 2020-11-30 | 2021-03-16 | 江苏科技大学 | Five-wire type air suspension vehicle body height sensor and vehicle body height control method |
| CN112539694A (en) * | 2020-11-19 | 2021-03-23 | 珠海格力电器股份有限公司 | Automobile body height detection device and method and automobile |
| CN112665499A (en) * | 2020-12-03 | 2021-04-16 | 珠海格力电器股份有限公司 | Position detection device and method of inductive height sensor and automobile |
-
2008
- 2008-10-24 CN CNU2008201866798U patent/CN201352107Y/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102049679B (en) * | 2010-11-10 | 2012-07-25 | 大连德新机电技术工程有限公司 | Vehicle height automatic measuring and adjustment device |
| CN102049679A (en) * | 2010-11-10 | 2011-05-11 | 大连德新机电技术工程有限公司 | Vehicle height automatic measuring and adjustment device |
| CN104960396A (en) * | 2015-07-08 | 2015-10-07 | 吉林大学 | Whole-vehicle height control method based on electric-control air hanging bracket adopting layered structure |
| CN105157803A (en) * | 2015-09-30 | 2015-12-16 | 李晓刚 | Vehicle load capacitance-type sensor |
| CN105157803B (en) * | 2015-09-30 | 2018-04-03 | 河北重优科技有限公司 | vehicle load capacitance type sensor |
| CN108973580A (en) * | 2018-07-30 | 2018-12-11 | 广州市米萨汽车电子科技有限公司 | Electric air pump |
| CN110411356A (en) * | 2019-07-30 | 2019-11-05 | 安徽安凯汽车股份有限公司 | One kind debugging auxiliary system for automobile ECAS |
| CN111486809B (en) * | 2020-05-13 | 2021-10-01 | 安美科(安徽)汽车电驱有限公司 | Detection equipment for height sensor of air suspension system |
| CN111486809A (en) * | 2020-05-13 | 2020-08-04 | 安美科(安徽)汽车电驱有限公司 | Detection equipment for height sensor of air suspension system |
| CN111998760A (en) * | 2020-07-07 | 2020-11-27 | 安徽博昕远智能科技有限公司 | Sensor and method for detecting displacement of vehicle body |
| CN112461114A (en) * | 2020-11-12 | 2021-03-09 | 珠海格力电器股份有限公司 | Detection device of inductive sensor, automobile and automobile body height detection method of automobile |
| CN112539694A (en) * | 2020-11-19 | 2021-03-23 | 珠海格力电器股份有限公司 | Automobile body height detection device and method and automobile |
| CN112539694B (en) * | 2020-11-19 | 2021-12-14 | 珠海格力电器股份有限公司 | Automobile body height detection device and method and automobile |
| CN112477542A (en) * | 2020-11-30 | 2021-03-12 | 江苏科技大学 | Three-wire type air suspension vehicle body height sensor and vehicle body height control method |
| CN112477541A (en) * | 2020-11-30 | 2021-03-12 | 江苏科技大学 | Four-wire type air suspension vehicle body height sensor and vehicle body height control method |
| CN112498045A (en) * | 2020-11-30 | 2021-03-16 | 江苏科技大学 | Five-wire type air suspension vehicle body height sensor and vehicle body height control method |
| CN112665499A (en) * | 2020-12-03 | 2021-04-16 | 珠海格力电器股份有限公司 | Position detection device and method of inductive height sensor and automobile |
| CN112665499B (en) * | 2020-12-03 | 2022-08-23 | 珠海格力电器股份有限公司 | Position detection device and method of inductive height sensor and automobile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201352107Y (en) | Air suspension bus body height detecting system | |
| CN102053226A (en) | Device and method for testing internal resistance of battery | |
| CN103901345B (en) | A kind of accumulator electric quantity detection apparatus and method | |
| CN103344822A (en) | Battery voltage monitoring circuit used for battery powered equipment | |
| CN106370273A (en) | Automobile fuel tank fuel capacity calibration system and calibration method | |
| CN104779670A (en) | Method for detecting whether storage battery is fully charged or not | |
| CN205826618U (en) | A kind of automobile exhaust gas checking apparatus | |
| CN208443493U (en) | A kind of thermistor resistance value observation circuit and electronic cigarette | |
| CN203350420U (en) | Battery voltage monitoring circuit for battery powered equipment | |
| CN107422268A (en) | Battery dump energy detection method | |
| CN203502565U (en) | Storage battery detector | |
| CN206819157U (en) | A kind of simulation test platform based on direct-current charging post | |
| CN105572502A (en) | Charging and discharging integrated detection device of energy storage super capacitor | |
| CN205982490U (en) | Charger detector | |
| CN104859454A (en) | SOC calculated value verification method and device | |
| CN202903887U (en) | Nitrogen-oxygen sensor heating detection circuit | |
| CN107677883A (en) | A kind of current sensor adjustment in accuracy device and method | |
| CN104111140A (en) | Detection device of impact pressure of door closing of automobile | |
| CN113156192A (en) | Current sampling device of high-voltage system of new energy vehicle | |
| CN107807335A (en) | A kind of carrying integrated automatic detection device of new-energy automobile DC/DC converters | |
| CN202103442U (en) | Mobile terminal and charge device | |
| CN211042724U (en) | Handheld HA LL type wheel speed simulation device | |
| CN211785914U (en) | MOSFET internal resistance detection circuit | |
| CN202372558U (en) | Voltage drop detection device for mechanical contact switch | |
| CN220359136U (en) | Timing circuit of analog sunlight sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091125 Termination date: 20101024 |