Classifications

• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
  • G06F7/60—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers
  • G06F7/62—Performing operations exclusively by counting total number of pulses ; Multiplication, division or derived operations using combined denominational and incremental processing by counters, i.e. without column shift
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
  • F02P9/00—Electric spark ignition control, not otherwise provided for
  • F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
  • F02P9/007—Control of spark intensity, intensifying, lengthening, suppression by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
  • G06F7/58—Random or pseudo-random number generators

Definitions

• the present invention relates to a pseudoperiodic logic signal generator that can be used in a multitude of applications and particularly in an automotive plasma ignition application by radiofrequency biasing of a resonator of a multi-spark plug.
• the BME multi-spark plug has a significant innovation and a different geometry from conventional spark plugs.
• Such a BME is described in detail in FR 03-10766, FR 03-10767, FR 03-10768, FR 04-12153 and FR 05-00777.
• An MSP comprises a resonator whose resonant frequency F c is located at high frequencies, typically between 4 and 6 MHz.
• the piloting of such a BME requires a periodic frequency control signal Fp as close as possible to the frequency F 0 .
• the patent application FR 05-12769 in the name of the applicant describes the modalities and constraints of optimal frequency control of a radiofrequency ignition of this type.
• the control of the BME consequently requires a control frequency F p equal to the resonance frequency F c with an accuracy better than 10 kHz, ie ⁇ 0.2% for the frequencies considered.
• the present invention overcomes these various disadvantages by providing a pseudoperiodic logic signal generator based on a clock operating at a reference frequency F re f at most equal to a few hundred MHz.
• K whole a second means of production capable of produce an offset pulse after a modified time interval r sec a selector means capable of selecting, between the first generating means and the second producing means, the means which produces the pulse driving said logic memory means, so as to include an offset pulse to correct the average period, in order to generate a pseudoperiodic signal of average period
• An advantage of the device according to the invention is to enable control of the resonator of a BME with the accuracy of the average frequency close to the expected frequency with a relatively low frequency reference clock.
• the selector means being able to select the third means of production, so that the first M pulses is advanced pulses.
• Another advantage of the device according to the invention is thus to avoid the appearance of an overvoltage at terminals of the transistor driven at the beginning of the production of a pseudoperiodic signal train.
• Another advantage of the device is to limit the losses by switching across the transistor, the voltage and the current across the transistor being out of phase with IT at the resonant frequency.
• the invention also relates to a radiofrequency ignition circuit comprising such a generator frequency-controlled resonator circuit for the production of a plasma.
• FIG. 1 shows a comparative chronogram of a periodic signal of reference and of FIG. a pseudo periodic signal as produced by a generator according to the invention
• FIG. 2 shows an embodiment of a generator according to the invention
• FIG. 3 shows a chronogram of the beginning of a pseudo periodic signal
• FIG. 4 schematically illustrates a radiofrequency ignition.
• FIG. 1 shows in a diagram as a function of time compared, a periodic reference signal 1 of period T ref and a signal indicative of a pseudo periodic signal 2 produced by the generator according to the invention.
• the principle of the invention consists in producing signal periods of multiple length of the reference period and correcting the average period of the signal by regularly modifying the length of a corrective period. Said modification may consist in lengthening or respectively shortening said corrective period by addition or withdrawal of a reference period T ref .
• this corrective period could be shortened in length
• the generator comprises a reference clock 5 capable of delivering a reference signal 1 of period T ref .
• a logical memory means 6 is used to format the signal 2 product.
• This memory means 6 outputs 62 a logic state (0 or 1) maintained.
• This memory means 6 is controllable by an input 61 in that the state of the output 62 changes when and each time the memory means 6 receives a pulse on its input 61.
• Pulse means in the remainder of the application, a pulse signal, or a signal indicating a change of state, for example a rising edge. Such a pulse regardless of its format is defined jointly between the memory means 6 receiver and issuing pulse generation means.
• T ref is the period of the reference signal
• r sec and r sec are times homogeneous to half periods of the pseudoperiodic signal 2.
• the pseudoperiodic signal 2 is built half period per half period.
• the generator further comprises a selector means 10, 12 capable of selecting, between the first production means 7 and the second production means 8, the production means which produces the pulse driving said logic memory means 6.
• Said selector 10, 12 is responsible for the sequential transmission of nominal pulses produced by the first production means 7 and the inclusion in said sequence of an impulse staggered regularly arranged to correct the average period.
• the logical memory means 6 thus receives a sequence of nominal pulses followed by an offset pulse. This makes it possible to generate a pseudoperiodic signal 2 comprising repetitively sequences composed of half periods of length r dry and a modified period of length r sec .
• the integer K is advantageously between 10 and 15.
• FIG. 4 represents the electronic circuit of such a candle.
• This circuit comprises a sub-circuit 20, acting as a resonator, built around a series RLC comprising a resistor Rs, an inductance Ls and a capacitor Cs.
• This resonator 20 when it is excited on its input 26 by a signal of frequency F p close to its natural frequency F 0 , produces a spark between the electrodes 24, 25 of the candle.
• Another sub-circuit 21 comprising a parallel LC consisting of an inductance Lp in parallel with a capacitance Cp.
• This circuit converts a voltage V2 into an amplified voltage Va which is supplied to the terminal of a MOS transistor 22 connected to the input 26 of the resonator 20.
• the pseudoperiodic signal 2 is injected on the gate 23 of the transistor 22.
• Said transistor 22 acts as a switch and transmits (respectively blocks) the voltage Va at the input 26 when the signal 2 is at the logic high (respectively low).
• the multi-spark plug produces a spark between its electrodes 24, 25 when its resonator 20 is excited by the pseudoperiodic signal 2.
• the signal 2 is not permanent but is present in the form of trains.
• the beginning of the biasing of the resonator 20 produces a transient state which induces an overvoltage across the transistor 22.
• This overvoltage can become higher than the steady state nominal voltage and is damaging in that it requires oversizing of the electronic components.
• One way to suppress or at least reduce this overvoltage is to reduce the duration of the first half-periods of the signal 2.
• the generator advantageously comprises a third production means 9 capable of producing, from said reference signal 1, an advanced pulse
• the K / 2 factor is advantageously whole.
• the division operator is here advantageously a Euclidean divider.
• the selector means 10, 11, 12 is adapted to be able to select said third production means 9, so that the first M M driving said logic memory means 6 are forward pulses.
• M is between 1 and the total number of half periods of a train.
• the logical memory means 6 produces for the first half M half periods of a train half periods shortened.
• the period T ref of the reference clock is advantageously between 1 ns and 200 ns, ie a clocking frequency between 5 MHz and IGHz. According to a preferred embodiment, the period T ref of the reference clock is equal to 8 ns, corresponding to a frequency of 125 MHz.
• the logical memory means 6 comprises an inverting logic DQ flip-flop 6, preferably self-sustaining by means of a loopback 63.
• 7, 8, 9 comprises a parameterizable counter 7, 8, 9 capable of counting an integer number P of reference periods T ref and of generating a pulse at the end of the count.
• Said counter is an interface to the reference clock 5 and receives a counting parameter P.
• the first production means 7, the second production means 8 and the third production means 9 merge into a production means 7,
• the selector 10, 11, 12 comprises an accumulator 12 incrementing for each pulse produced by a production means 7, 8, 9, an increment Inc determined according to the correction of desired frequency, and a multiplexer 10, 11 selectable from the K r K parameters ⁇ 1 e t KH ⁇ the accumulator 12 is informed of the generation of a pulse by a production means 7, 8, 9 via the branch 13.
• the multiplexer may be single or two-component stage 10, 11 as shown in FIG. 2.
• the selection is made, via branch 19, for the parameter KI1 at the beginning of the train for the first M pulses of a train. Then, in steady state, the selection is made between K e t ⁇ ⁇ 1.
• the selector 10 transmits to the production means 7, 8, 9, the parameter K to produce nominal pulses.
• the accumulator 12 when it reaches saturation, selects, via the branch 14, the parameter K ⁇ 1, in order to produce a modified pulse.
• the function of the accumulator 12 is to determine when an offset pulse is to be inserted between the base pulses.
• the accumulator 12 comprises a memory register of n bits and can therefore take 2 n values.
• the increment Inc in order to take into account the frequency correction necessary to obtain the desired average frequency F, is then equal to
• the Round function designates the nearest integer.
• the register is incremented.
• the saturation is reached when said register reaches or exceeds the value 2 n , the parameter ⁇ T ⁇ 1 is then selected for a pulse, via the branch 14.
• the register being cyclic is advantageously permanently available to be incremented. It is remarkable that in this embodiment an average frequency F moy of the signal is obtained without direct counting of the half periods. This frequency is thus very close to the objective frequency, to the rounding done by. The accuracy thus achieved increases with the dimension n of the register of the accumulator 12.
• a memory register for the accumulator 12 of n 8 bits answers the need for precision of the application.
• the generator includes storage registers 16, 17, 18, 15 of the parameters K, K ⁇ 1 r K12 e -
• These registers taking into account the envisaged values are advantageously registers 16, 17, 18 of 4 bits for K, K ⁇ 1 e t f KI2 and a register 15 of 8 bits for the increment Inc.
• the generator further comprises, in order to determine the trains of the pseudoperiodic signal 2, an adjustable timer means (not shown) capable of limiting a duration of generation of said pseudoperiodic logic signal 2.
• said duration is advantageously adjustable between 50 ⁇ s and 500 ⁇ s.
• the generator can be realized with discrete logic components, such as logic gates, counters, accumulators ...
• the generator can also be realized with a specific logic component of the integrated circuit type specific to the application (or in English: Application Specifies Integrated Circuit or ASIC).
• the generator can also be made with at least one Programmable Gate array type programmable component (or in English: Programmable File Gâte Array or FPGA), microcontroller or microprocessor.

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• Engineering & Computer Science (AREA)
• Theoretical Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• Mathematical Analysis (AREA)
• Computational Mathematics (AREA)
• Computing Systems (AREA)
• Mathematical Optimization (AREA)
• Mathematical Physics (AREA)
• Pure & Applied Mathematics (AREA)
• Nonlinear Science (AREA)
• Manipulation Of Pulses (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)
• Pulse Circuits (AREA)
• Plasma Technology (AREA)

Applications Claiming Priority (2)

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• 2006
  • 2006-08-30 FR FR0607639A patent/FR2905538B1/fr not_active Expired - Fee Related
• 2007
  • 2007-07-27 MX MX2009002203A patent/MX2009002203A/es active IP Right Grant
  • 2007-07-27 JP JP2009526151A patent/JP4960457B2/ja not_active Expired - Fee Related
  • 2007-07-27 RU RU2009111249/08A patent/RU2439789C2/ru active
  • 2007-07-27 KR KR1020097004118A patent/KR101446126B1/ko active IP Right Grant
  • 2007-07-27 US US12/439,174 patent/US7974068B2/en not_active Expired - Fee Related
  • 2007-07-27 BR BRPI0716429A patent/BRPI0716429B1/pt not_active IP Right Cessation
  • 2007-07-27 EP EP07823652A patent/EP2057533A1/fr not_active Withdrawn
  • 2007-07-27 WO PCT/FR2007/051737 patent/WO2008025911A1/fr active Application Filing
  • 2007-07-27 CN CN2007800300644A patent/CN101501632B/zh not_active Expired - Fee Related

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