CN201148923Y - Electromagnetic valve injection drive circuit of natural gas engine - Google Patents
Electromagnetic valve injection drive circuit of natural gas engine Download PDFInfo
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- CN201148923Y CN201148923Y CNU2008200787394U CN200820078739U CN201148923Y CN 201148923 Y CN201148923 Y CN 201148923Y CN U2008200787394 U CNU2008200787394 U CN U2008200787394U CN 200820078739 U CN200820078739 U CN 200820078739U CN 201148923 Y CN201148923 Y CN 201148923Y
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Abstract
The utility model relates to a driving circuit of the injection solenoid valve of a natural gas engine, which belongs to the technology field of the hardware system of the electronic-controlled engine. The driving circuit comprises a peak holding and pulse width generation circuit, a peak holding and current setting circuit, an incorrect injection preventing circuit, etc.; a capacitor C7 is connected with an injection input signal DRVSIGNAL1 and the negative port of a comparator A; the output signal COUT1 of the comparator A is connected with the base electrode of a triode Q1; a resister R1 is connected with the positive port and the output port of a comparator B; one end of a resister R9 is connected with an injection controlling signal DRVSIGNAL1; the other end is connected with the positive port of a comparator C; the port 2 of a high and low edge driver is connected with the signals of the output port of the comparator C; the port 8 is connected with the cathode of a diode MUR1; the drain electrode of an MOSFET chip Q2 is connected with a power supply VBAT. The driving circuit has the advantages that the generation of the peak current pulse width can be realized; the injection driving control manner is simplified; the configurability of the circuit is higher; and the incorrect injection phenomenon can be effectively prevented.
Description
Technical field
A kind of natural gas engine electromagnetic valve jet drive circuit relates to the drive circuit of the jet solenoid valve of electric-controlled natural gas engine, belongs to electric-control motor hardware system technical field.
Background technique
In the electric-controlled natural gas engine ejecting system, be to realize the accurately basis of control of multi-point injection to the drive controlling of solenoid valve.The solenoid valve action is to realize by the electromagnetic force that the controlling and driving electric current produces.When closing solenoid valve, connect drive circuit and produce suitable drive current, driving current produces enough electromagnetic force driving armature motions by electromagnetic valve coil again and takes a seat, thereby disconnects solenoid valve bar gas pipeline; When solenoid valve was opened, drive circuit disconnected, and no longer produces driving current and electromagnetic force, and armature resets under the effect of Returnning spring, connected the gas circuit of closure when closing.This is a process that relates to many factor interactions such as mechanical, electrical, magnetic, the mechanical energy of solenoid valve armature motion is provided by electromagnetic force, but electromagnetic force is controlled by driving current, and driving current is controlled by drive circuit.
For reaching purposes such as protection solenoid valve, raising reliability, the closed electromagnetic valve process all has certain requirement to parameters such as driving current size, endurance, and these parameters make driving current show specific waveform.Present stage, what combination property was best is the driving current of ' peak value+keep ' waveform, and this current waveform as shown in Figure 1.In order to realize the driving current of the type, some drive circuits have been developed.As traditional high low side driving structure, the shared high-end drive circuit of each solenoid valve comprises a high-side driver power supply and a high-end power drive pipe.Each solenoid valve respectively has a cover low-side driver circuitry, and main devices is that a low side pliotron is the detection driving current, and many common ports at each solenoid valve are provided with sampling resistor.During work, adjust the driving current size, realize selecting the cylinder function by gating low side pliotron by the dutycycle that changes high-end pliotron control impuls.Though this drive circuit is realized simple, but there are some shortcomings: at first, driving current is controlled and need be fed back by realization software, be that single-chip microcomputer is sampled to driving current, then the control impuls dutycycle is modulated control, the software work amount is bigger, and control frequency is lower simultaneously, and precision can't improve.Secondly, on hardware driving, can't effectively prevent the generation that mistake is sprayed.
Traditional rock gas electromagnetic valve jet drive circuit all needs to improve on driving force, control reliability.For overcoming above deficiency, task of the present utility model is to improve the drive circuit ability, improves to drive reliability; Reduce the cost of drive circuit simultaneously.
Summary of the invention
The purpose of this utility model is to propose a kind of configurable type natural gas injection driving circuit for electromagnetic valve.Whole drive circuit comprises that peak value is kept pulsewidth generation circuit, peak value is kept current setting circuit, prevented that mistake spray circuit, high-low side from driving and current sampling circuit four parts are formed.Peak value is kept pulsewidth generation circuit and is comprised comparator, protection diode, resistance, electric capacity etc.; Peak value is kept current setting circuit and is comprised comparator, triode, resistance, electric capacity etc.; Prevent that the mistake spray circuit from comprising comparator, resistance, electric capacity etc.; High-low side drives and current sampling circuit comprises high-low side driving chip, diode, electric capacity, driving tube, operational amplifier, sampling resistor etc.This control circuit receives and sprays control impuls, produces the peak value pulsewidth automatically and sets, and can keep driving current in setting range.
Peak value is kept pulsewidth generation circuit and is made up of comparator A and two-way RC circuit.Comprise resistance R 10, R14, R18, capacitor C 1, C2, C7, Zener diode D1, D3, comparator A.Resistance R 10 is 4.7k Ω, and R14 is 1M Ω, and R18 is 1M Ω.Capacitor C 1 is 0.1 μ F, and C2 and C7 are 1000pF.Zener diode D1, D3 are the 5V Zener diode.The model of comparator A is LM2902.Capacitor C 7 connects the negative pole port that sprays input signal DRVSIGNAL1 and comparator A.The negative pole port of resistance R 18, one termination comparator A, the other end ground connection.Zener diode D3 and resistance R 18 parallel connections, the negative pole port of negative electrode termination comparator A, anode tap ground connection.Capacitor C 1 one end ground connection, a termination power VCC.Resistance R 8 one end ground connection, the anodal port of another termination comparator A.Resistance R 14 1 termination power VCC, the anodal port of another termination comparator A.Zener diode D1 and resistance R 8 parallel connections, the anodal port of negative electrode termination comparator A, anode tap ground connection.Capacitor C 2 connects anodal port and the output port of comparator A.Resistance R 10 connects the output port of power supply VCC and comparator A.This circuit input signal is exported to peak value and is kept the output port signal COUT1 that the signal of current setting circuit is comparator A for spraying control signal DRVSIGNAL1.
Peak value is kept current setting circuit and is comprised comparator B, NPN triode Q1, resistance R 1, R2, R3, R5, R7, R11, R12, R16, capacitor C 4.Resistance R 1, R2 are 1M Ω, and R3 is 4.7k Ω, and R5 is 47k Ω, and R7 is 20k Ω, and R11 is 5.1k Ω, and R12 and R16 are 39k Ω.Capacitor C 4 is 0.01 μ F.The model of NPN triode Q1 is 9013.The model of comparator B is LM2902.The base stage of the output signal COUT1 input triode Q1 of comparator A, the grounded-emitter connection of triode.Resistance R 16 1 terminating resistor R12, the other end ground connection.Resistance R 12 connects the emitter of R16 and triode Q1.Resistance R 11 1 ends link to each other with the emitter of triode Q1, and the other end links to each other with resistance R 7.Resistance R 7 one ends connect power supply VCC, and the other end connects resistance R 11.Capacitor C 4 one ends connect resistance R 11, and the other end connects resistance R 5.Resistance R 5 connects capacitor C 4 and resistance R 2.The anodal port of resistance R 2 one termination comparator B, the other end ground connection.The negative pole port input of comparator B is from the current feedback signal CRT1 of high-low side driving and current sampling circuit output.Resistance R 1 connects anodal port and the output port of comparator B.Resistance R 3 one termination power VCC, the output port of another termination comparator B.The input signal of this circuit is for keeping pulsewidth and produce the COUT1 signal of circuit and driving and the CRT1 signal of current sampling circuit from high-low side from peak value, outputing to the signal that prevents the mistake spray circuit is the output port signal COUT2 of comparator B.
Prevent that the mistake spray circuit from comprising comparator C, resistance R 4, R6, R9, R13, R15, R17.Resistance R 4 is 4.7k Ω, and R6 and R9 are 100k Ω, and R13 is 39k Ω, and R15 and R17 are 1k Ω.The model of comparator C is LM2902.Resistance R 6 one ends connect the output port of comparator B, and the other end connects the anodal port of comparator C.Resistance R 9 one ends connect injection control signal DRVSIGNAL1, and the other end connects the anodal port of comparator C.Resistance R 15 1 ends connect the anodal port of comparator C, the other end ground connection.Resistance R 17 1 ends connect the negative pole port of comparator C, the other end ground connection.Resistance R 13 1 ends connect power supply VCC, and the other end connects the negative pole port of comparator C.Resistance R 4 one ends connect power supply VCC, and the other end connects the output port of comparator C.The input signal of this circuit is for spraying control signal DRVSIGNAL1 and keeping the COUT2 signal of current setting circuit from peak value, exports to that high-low side drives and the signal of current sampling circuit is the output port signal COUT3 of comparator C.
High-low side drives and current sampling circuit comprises the high-low side driver, operational amplifier, MOSFET chip Q2, Q3, diode MUR1, D2, D4, resistance R 19, R20, R21, R22, R23, R25, sampling resistor R24, capacitor C 3, C5, C6, C8, C9, C10.Resistance R 19, R20 and R21 are 100 Ω, and R22 is 6.8k Ω, and R23 is 1k Ω, and R25 is 2.2k Ω.The model of sampling resistor R24 is 0.01 Ω, power 2W.Capacitor C 3, C6 and C10 are 0.1 μ F, and C5 is 4.7 μ F, and C8 is 47nF, and C9 is 0.01 μ F.The 12V reference diode of diode MUR1, diode D2 are Zener 15V diode, and diode D4 is a SK55L cascading water diode.The model of MOSFET chip Q2 and Q3 is IRLR2905.The model of operational amplifier is AD8051.The model of high-low side driver is IR2101.Capacitor C 3 one termination level V_D12, the other end ground connection.High-low side driver port 1 meets level V_D12, and port 2 connects the output port signal of comparator C, and port 3 connects and sprays control signal DRVSIGNAL1, port 4 ground connection, port 5 connecting resistance R20, port 6 connects capacitor C 6, port 7 connecting resistance R19, port 8 connects diode MUR1 negative electrode.The anode of diode MUR1 meets level V_D12, and negative electrode connects the port 8 of high-low side driver.The positive pole of capacitor C 5 connects the port 8 of high-low side driver, and negative pole connects the port 6 of high-low side driver.Capacitor C 6 two ends connect the port 8 and the port 6 of high-low side driver.The anode of diode D2 connects the port 6 of high-low side driver, and negative electrode connects the grid of MOSFET chip Q2.The negative electrode of diode D4 connects the port 6 of high-low side driver, plus earth.The port 7 of resistance R 19 1 termination high-low side drivers, the grid of another termination MOSFET chip Q2.The port 5 of resistance R 20 1 termination high-low side drivers, the grid of another termination MOSFET chip Q3.The drain electrode of MOSFET chip Q2 meets power supply VBAT, and source electrode connects solenoid valve one end.The drain electrode of MOSFET chip Q3 connects the other end of solenoid valve, and source electrode meets sampling resistor R24.The source electrode of sampling resistor R24 one termination MOSFET chip Q3, the other end ground connection.Resistance R 21 1 termination capacitor C10, another termination sampling resistor R24.Capacitor C 10 and C8 parallel connection, a terminating resistor R21, the other end ground connection.The negative pole of resistance R 23 1 termination operational amplifiers, the other end ground connection.The negative pole of resistance R 22 1 termination operational amplifiers, the other end connecting resistance R25.Resistance R 25 1 terminating resistor R22, the output port of another termination operational amplifier.Capacitor C 9 one termination power VCC, the other end ground connection.The output port signal of operational amplifier is CRT1.The input signal of this circuit is for injection control signal DRVSIGNAL1 with from the signal COUT3 that prevents the mistake spray circuit, and output signal is current feedback signal CRT1, and CRT1 signal input peak value is kept current setting circuit.
Compared with prior art, the beneficial effects of the utility model are: simplified the jet drive control mode 1., single-chip microcomputer only need send and spray square-wave pulse and get final product, selects cylinder pulse and injection pulse just the same, and single-chip microcomputer need not take the injection control impuls that large resource produces complexity very much.2. the configurability of circuit is higher, by the setting of different resistance values in the circuit, can realize different Peak currents and the setting of keeping electric current.3. the reliability of circuit improves, and by the design of circuit module, can prevent effectively that the mistake injection from taking place.
Description of drawings
Fig. 1 is the driving current schematic representation.
Fig. 2 is the utility model circuit diagram.
Fig. 3 is working procedure part signal figure.
Embodiment
Further specify the utility model below in conjunction with embodiment and accompanying drawing.
Fig. 1 is the driving current schematic representation.Fig. 2 is the utility model circuit diagram.Fig. 3 is working procedure part signal figure.
Whole drive circuit comprises that peak value is kept pulsewidth generation circuit, peak value is kept current setting circuit, prevented that mistake spray circuit, high-low side from driving and current sampling circuit four parts are formed.Peak value is kept pulsewidth and is produced circuit and be made up of comparator A and two-way RC circuit, and the ejection drive pulse signal is imported one road RC circuit, imports LM2902 comparator A negative pole port then.When pulse input end is low level, the level ratio negative pole port height of the anodal port of comparator A, then comparator A output low level.After pulse input end became high level, the anodal port level of comparator A rose to 2.5V from 0V, and negative pole port level drops to 0V from 5V, and before the two-port level equated, comparator A exported high level.The width of this section high level is the Peak current pulsewidth.
Peak value is kept current setting circuit and is comprised LM2902 comparator B, NPN triode, resistance and electric capacity.The resistance configuration circuit that the peak pulse of comparator A output is formed by the NPN triode, two kinds of different level of positive terminal interruption-forming at comparator B, the negative pole port of comparator B is the level after sample rate current amplifies through operational amplifier, the output port of corresponding comparator B compares control to varying level, can realize different peak values and the configuration of keeping electric current.
Prevent that spray circuit is made up of comparator C and a series of resistance by mistake, when the injection signal input end is low level, the level of the anodal port of comparator C is lower than the level of negative pole port always, so the level of output port is low always, can effectively prevent the generation that mistake is sprayed.
High-low side drives and current sampling circuit is made up of high-low side driver IR2101, MOSFET, diode, resistance, electric capacity, high-precision power samples resistance, AD8051 operational amplifier etc.The output control signal of comparator C is sprayed control impuls as low limit drive control signal as the flash drive control signal, can realize the high-low side driving mode effectively.Can realize the sampling and the amplification of electric current by resistance configuration.The level after the sampling and the level ratio of setting realize different peak values and the current control mode of keeping electric current.
The utility model compared with prior art has the following advantages and effect: at first, and by LM2902 comparator and corresponding Circuit is arranged on the generation that has realized the peak point current pulsewidth on the hardware; Secondly, can realize the different width of cloth by different resistance settings The peak value of value and keep the electric current setting; At last, this drive circuit has higher reliability, can effectively prevent from spraying sending out by mistake Give birth to.
Claims (5)
1, a kind of natural gas engine electromagnetic valve jet drive circuit is characterized in that, described drive circuit comprises that peak value is kept pulsewidth generation circuit, peak value is kept current setting circuit, prevented that mistake spray circuit, high-low side from driving and current sampling circuit;
Described peak value is kept pulsewidth generation circuit and is comprised resistance R 10, R14, R18, capacitor C 1, C2, C7, Zener diode D1, D3, comparator A; Capacitor C 7 connects the negative pole port that sprays input signal DRVSIGNAL1 and comparator A; The negative pole port of resistance R 18 1 termination comparator A, the other end ground connection; Zener diode D3 and resistance R 18 parallel connections, the negative pole port of negative electrode termination comparator A, anode tap ground connection; Capacitor C 1 one end ground connection, a termination power VCC; Resistance R 8 one end ground connection, the anodal port of another termination comparator A; Resistance R 14 1 termination power VCC, the anodal port of another termination comparator A; Zener diode D1 and resistance R 8 parallel connections, the anodal port of negative electrode termination comparator A, anode tap ground connection; Capacitor C 2 connects anodal port and the output port of comparator A; Resistance R 10 connects the output port of power supply VCC and comparator A;
Described peak value is kept current setting circuit and is comprised comparator B, NPN triode Q1, resistance R 1, R2, R3, R5, R7, R11, R12, R16, capacitor C 4; The base stage of the output signal COUT1 input triode Q1 of comparator A, the grounded-emitter connection of triode; Resistance R 16 1 terminating resistor R12, the other end ground connection; Resistance R 12 connects the emitter of R16 and triode Q1; Resistance R 11 1 ends link to each other with the emitter of triode Q1, and the other end links to each other with resistance R 7; Resistance R 7 one ends connect power supply VCC, and the other end connects resistance R 11; Capacitor C 4 one ends connect resistance R 11, and the other end connects resistance R 5; Resistance R 5 connects capacitor C 4 and resistance R 2; The anodal port of resistance R 2 one termination comparator B, the other end ground connection; The negative pole port input of comparator B is from the current feedback signal CRT1 of high-low side driving and current sampling circuit output; Resistance R 1 connects anodal port and the output port of comparator B; Resistance R 3 one termination power VCC, the output port of another termination comparator B
The described mistake spray circuit that prevents comprises comparator C, resistance R 4, R6, R9, R13, R15, R17; Resistance R 6 one ends connect the output port of comparator B, and the other end connects the anodal port of comparator C; Resistance R 9 one ends connect injection control signal DRVSIGNAL1, and the other end connects the anodal port of comparator C; Resistance R 15 1 ends connect the anodal port of comparator C, the other end ground connection; Resistance R 17 1 ends connect the negative pole port of comparator C, the other end ground connection; Resistance R 13 1 ends connect power supply VCC, and the other end connects the negative pole port of comparator C; Resistance R 4 one ends connect power supply VCC, and the other end connects the output port of comparator C;
Described high-low side drives and current sampling circuit comprises the high-low side driver, operational amplifier, MOSFET chip Q2, Q3, diode MUR1, D2, D4, resistance R 19, R20, R21, R22, R23, R25, sampling resistor R24, capacitor C 3, C5, C6, C8, C9, C10; Capacitor C 3 one termination level V_D12, the other end ground connection; High-low side driver port 1 meets level V_D12, and port 2 connects the output port signal of comparator C, and port 3 connects and sprays control signal DRVSIGNAL1, port 4 ground connection, port 5 connecting resistance R20, port 6 connects capacitor C 6, port 7 connecting resistance R19, port 8 connects diode MUR1 negative electrode; The anode of diode MUR1 meets level V_D12, and negative electrode connects the port 8 of high-low side driver; The positive pole of capacitor C 5 connects the port 8 of high-low side driver, and negative pole connects the port 6 of high-low side driver; Capacitor C 6 two ends connect the port 8 and the port 6 of high-low side driver; The anode of diode D2 connects the port 6 of high-low side driver, and negative electrode connects the grid of MOSFET chip Q2; The negative electrode of diode D4 connects the port 6 of high-low side driver, plus earth; The port 7 of resistance R 19 1 termination high-low side drivers, the grid of another termination MOSFET chip Q2; The port 5 of resistance R 20 1 termination high-low side drivers, the grid of another termination MOSFET chip Q3; The drain electrode of MOSFET chip Q2 meets power supply VBAT, and source electrode connects solenoid valve one end; The drain electrode of MOSFET chip Q3 connects the other end of solenoid valve, and source electrode meets sampling resistor R24; The source electrode of sampling resistor R24 one termination MOSFET chip Q3, the other end ground connection; Resistance R 21 1 termination capacitor C10, another termination sampling resistor R24; Capacitor C 10 and C8 parallel connection, a terminating resistor R21, the other end ground connection; The negative pole of resistance R 23 1 termination operational amplifiers, the other end ground connection; The negative pole of resistance R 22 1 termination operational amplifiers, the other end connecting resistance R25; Resistance R 25 1 terminating resistor R22, the output port of another termination operational amplifier; Capacitor C 9 one termination power VCC, the other end ground connection.
2, a kind of natural gas engine electromagnetic valve jet drive circuit according to claim 1 is characterized in that, described resistance R 10 is 4.7k Ω, and R14 is 1M Ω, and R18 is 1M Ω; Capacitor C 1 is 0.1 μ F, and C2 and C7 are 1000pF; Zener diode D1, D3 are the 5V Zener diode; The model of comparator A is LM2902.
3, a kind of natural gas engine electromagnetic valve jet drive circuit according to claim 1 is characterized in that, described resistance R 1, R2 are 1M Ω, and R3 is 4.7k Ω, and R5 is 47k Ω, and R7 is 20k Ω, and R11 is 5.1k Ω, and R12 and R16 are 39k Ω; Capacitor C 4 is 0.01 μ F; The model of NPN triode Q1 is 9013; The model of comparator B is LM2902.
4, a kind of natural gas engine electromagnetic valve jet drive circuit according to claim 1 is characterized in that, described resistance R 4 is 4.7k Ω, and R6 and R9 are 100k Ω, and R13 is 39k Ω, and R15 and R17 are 1k Ω; The model of comparator C is LM2902.
5, a kind of natural gas engine electromagnetic valve jet drive circuit according to claim 1 is characterized in that, resistance R 19, R20 and R21 are 100 Ω, and R22 is 6.8k Ω, and R23 is 1k Ω, and R25 is 2.2k Ω; The model of sampling resistor R24 is 0.01 Ω, power 2W; Capacitor C 3, C6 and C10 are 0.1 μ F, and C5 is 4.7 μ F, and C8 is 47nF, and C9 is 0.01 μ F; The 12V reference diode of diode MUR1, diode D2 are Zener 15V diode, and diode D4 is a SK55L cascading water diode; The model of MOSFET chip Q2 and Q3 is IRLR2905; The model of operational amplifier is AD8051; The model of high-low side driver is IR2101.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200787394U CN201148923Y (en) | 2008-01-25 | 2008-01-25 | Electromagnetic valve injection drive circuit of natural gas engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200787394U CN201148923Y (en) | 2008-01-25 | 2008-01-25 | Electromagnetic valve injection drive circuit of natural gas engine |
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| CNU2008200787394U Expired - Lifetime CN201148923Y (en) | 2008-01-25 | 2008-01-25 | Electromagnetic valve injection drive circuit of natural gas engine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104005818A (en) * | 2014-05-07 | 2014-08-27 | 潍柴动力股份有限公司 | Current control method and system for urea nozzle |
| CN104564461A (en) * | 2013-10-10 | 2015-04-29 | 常远 | Oil injector electromagnetic valve driving circuit controlled by current feedback |
| CN106090383A (en) * | 2016-08-26 | 2016-11-09 | 重庆红江机械有限责任公司 | Gas trap drive circuit |
| CN107842445A (en) * | 2017-09-28 | 2018-03-27 | 中国第汽车股份有限公司 | Natural gas engine ECU injection apparatus and control method |
| CN109270868A (en) * | 2018-10-24 | 2019-01-25 | 安徽锐视光电技术有限公司 | A kind of height driving system for electromagnetic valve |
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- 2008-01-25 CN CNU2008200787394U patent/CN201148923Y/en not_active Expired - Lifetime
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| CN104564461A (en) * | 2013-10-10 | 2015-04-29 | 常远 | Oil injector electromagnetic valve driving circuit controlled by current feedback |
| CN104564461B (en) * | 2013-10-10 | 2017-12-15 | 中国人民解放军海军工程大学 | A kind of Drive Circuit for Injector Solenoid Valve of Current Feedback Control |
| CN104005818A (en) * | 2014-05-07 | 2014-08-27 | 潍柴动力股份有限公司 | Current control method and system for urea nozzle |
| CN104005818B (en) * | 2014-05-07 | 2016-08-17 | 潍柴动力股份有限公司 | The current control method of a kind of urea nozzle and system |
| CN106090383A (en) * | 2016-08-26 | 2016-11-09 | 重庆红江机械有限责任公司 | Gas trap drive circuit |
| CN106090383B (en) * | 2016-08-26 | 2018-06-01 | 重庆红江机械有限责任公司 | Gas valve-driving circuit |
| CN107842445A (en) * | 2017-09-28 | 2018-03-27 | 中国第汽车股份有限公司 | Natural gas engine ECU injection apparatus and control method |
| CN109270868A (en) * | 2018-10-24 | 2019-01-25 | 安徽锐视光电技术有限公司 | A kind of height driving system for electromagnetic valve |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080125 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |