CN101255826B - Judgment apparatus and method for judging cylinder state in engine - Google Patents
Judgment apparatus and method for judging cylinder state in engine Download PDFInfo
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- CN101255826B CN101255826B CN2007100004996A CN200710000499A CN101255826B CN 101255826 B CN101255826 B CN 101255826B CN 2007100004996 A CN2007100004996 A CN 2007100004996A CN 200710000499 A CN200710000499 A CN 200710000499A CN 101255826 B CN101255826 B CN 101255826B
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Abstract
The present invention provides a device and method for judging state of engine cylinder. When judging the state of cylinder in engine is required, the probe and resistance part of resistance disk connects electrically immediately, the state of cylinder in engine is judged, and engine will start according to correct turn based on the judging result, so the interval time from start to run normally of engine is shortened.
Description
Technical field
The present invention relates to a kind of judgment means and method that is used for judging the motor cylinder state.
Background technique
Recently, for satisfying the requirement of engine gas proportions of ingredients High Accuracy Control, the motor of multiple power equipment all has electronic fuel injection technology and automatically controlled sequentially fired technology, as automobile.Like this, in the working procedure of motor, can both carry out optiumum control to the mixing of air and gasoline in all positions of cylinder running, thereby make power character, the Economy optimum of motor, can reduce the pollution of discharging simultaneously.
Yet motor is when starting, and the problem that at first faces is exactly to need to judge that in a plurality of cylinders which is about to or reached top dead center, thereby can carry out fuel injection and igniting according to correct order exactly, Here it is motor declare cylinder.
The method of cylinder state generally has two kinds in traditional judgement motor, a kind of is to declare cylinder by suction pressure, another kind is to declare cylinder by the position of bent axle and camshaft, preceding a kind of method need be transformed the intake manifold of motor, air pressure probe is installed, make original comparatively narrow intake manifold become littler, be unfavorable for air inlet, thereby most position signal that adopts by crankshaft position sensor and CMPS Camshaft Position Sensor collecting crankshaft and camshaft, and after this position signal is sent to electronic control unit (ECU), declare cylinder according to the program of setting by ECU.
Yet, when motor just starts, motor drives running by starting motor, at this moment, the rotating speed of bent axle and camshaft is lower, and rotating speed has bigger fluctuation, very unstable, the distorted signals that crankshaft position sensor and CMPS Camshaft Position Sensor are collected is serious, thereby, generally speaking, when just starting, ECU does not declare cylinder with the signal that this moment, crankshaft position sensor and CMPS Camshaft Position Sensor recorded, but carries out fuel injection and IGNITION CONTROL according to predetermined start-up routine.After speed of crankshaft reached fair speed, the signal that ECU is just collected according to crankshaft position sensor and CMPS Camshaft Position Sensor carried out fuel injection and IGNITION CONTROL according to the program of setting.
But, during engine start, position of piston varies in each cylinder, carry out fuel injection and IGNITION CONTROL according to same predetermined start-up routine, be difficult to during startup to guarantee start function obtain best combustion gas mixing than and short starting time, thereby the Economy of motor and discharge relatively poor.And since during cold start-up motor can not start fast, motor needs a relatively long time from starting to the running state that reaches best.
Summary of the invention
The objective of the invention is in order when starting, can not quick and precisely to judge the defective of cylinder state in the motor in the motor that overcomes prior art, and a kind of apparatus and method that can realize quick and precisely judging cylinder state in the motor when starting are provided.
The invention provides a kind of judgment means of judging the cylinder state, this judgment means comprises detection device and signal processing apparatus, it is characterized in that, described judgment means also comprises the resistance dish, described resistance dish has insulated part and along the active component that resistance dish circumferencial direction distributes and head and the tail disconnect, described insulated part is used for the resistance dish is fixedly connected on camshaft; Described detection device comprises probe, and described probe is used for contacting with described active component, described probe and active component so that electric current can be flowed through; Described signal processing apparatus is used for gathering by probe voltage a kind of at effective resistance part two ends of electric current, the resistance dish of the effective resistance of resistance dish, the probe of flowing through, and according to a kind of rotational position of judging camshaft in the voltage at the effective resistance part two ends of the electric current of the effective resistance of resistance dish, the probe of flowing through, resistance dish, and then judge the cylinder state according to the rotational position of camshaft.
The present invention also provides a kind of determination methods of judging cylinder state in the motor, wherein, this determination methods comprises: the resistance dish is fixedly installed in described camshaft, described resistance dish has insulated part and along the active component that resistance dish circumferencial direction distributes and head and the tail disconnect, described insulated part is used for the resistance dish is fixedly connected on camshaft; The active component of resistance dish is contacted with probe, have potential difference between the active component of resistance dish and the probe; Gather a kind of in the voltage at effective resistance part two ends of electric current, resistance dish of the effective resistance of resistance dish, the probe of flowing through by probe, and relatively with a kind of and predetermined reference value in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish gathered, the probe of flowing through, resistance dish, thereby judge the rotational position of camshaft, and then judge the cylinder state according to the rotational position of camshaft.
Judgment means according to judgement cylinder state provided by the invention, in this judgment means, the resistance dish of fixedlying connected with camshaft has along the active component that resistance dish circumferencial direction distributes and head and the tail disconnect, probe can electrically contact with this active component, described probe and active component so that electric current can be flowed through, thereby, the resistance dish can have different rotational position with the rotation of camshaft, when probe electrically contacts with the active component that is positioned at the resistance dish of different rotary position, because the effective resistance difference of active component, the voltage at the effective resistance part two ends of the electric current of the probe of flowing through and active component are all different.Like this, the rotational position of resistance dish is judged in the variation of the voltage at the electric current that can be by the effective resistance of judging active component, the probe of flowing through or the effective resistance part two ends of active component, and the rotational position of resistance dish is identical with the rotational position of camshaft, thereby obtain the rotational position of camshaft, and then camshaft revolves the characteristic of three-sixth turn can finish a work cycle according to motor the time, judges the state of each cylinder in the motor.
According to determination methods provided by the invention, at first the resistance dish is installed, gather a kind of in the voltage at effective resistance part two ends of electric current, resistance dish of the effective resistance of resistance dish, the probe of flowing through by probe then, because when probe electrically contacts with the active component that is positioned at the resistance dish of different rotary position, because the effective resistance difference of active component, the voltage at the effective resistance part two ends of the electric current of the probe of flowing through and active component are all different.Thereby can be, and then judge the cylinder state according to the rotational position of camshaft according to a kind of rotational position of judging camshaft in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish of gathering, the probe of flowing through, resistance dish.
Judgment means and method according to judgement cylinder state provided by the invention, when needs are judged in the motor cylinder state, the active component of probe and resistance dish electrically contacts immediately, thereby can judge the state of cylinder in the motor at once, then, motor starts rapidly according to correct order according to this judged result again, thereby has shortened motor effectively from starting to the blanking time that runs well.
Description of drawings
Fig. 1 is the structural representation of the judgment means of judgement cylinder state provided by the invention;
Fig. 2 is the connection diagram of the judgment means of judgement cylinder state provided by the invention;
Fig. 3 is the schematic representation of the resistance dish of judgment means among Fig. 2;
The current loop schematic representation of Fig. 4 for when probe is electrically connected with the resistance dish, forming;
When the resistance dish among Fig. 5 Fig. 3 is applied to four cylinder engine, the contact position of probe and resistance dish and the relativity schematic representation of cylinder state;
Fig. 6 is the schematic representation of the determination methods of judgement engine condition provided by the invention.
Embodiment
Below with reference to accompanying drawing the present invention is described in detail.As Fig. 1, Fig. 2 and shown in Figure 3, provided by the inventionly be used to judge that the judgment means 1 of cylinder state comprises detection device and signal processing apparatus 3, wherein, described judgment means also comprises resistance dish 6, described resistance dish 6 has insulated part 12 and along the active component 11 that resistance dish circumferencial direction distributes and head and the tail disconnect, described insulated part 12 is used for resistance dish 6 is fixedly connected on camshaft 4;
Described detection device comprises probe 7, and described probe 7 is used for contacting with described active component 11, described probe 7 and active component 11 so that electric current can be flowed through.Owing to have potential difference between described probe 7 and the described active component 11, when the two contacts, have electric current to flow through;
Described signal processing apparatus is used for gathering by probe 7 voltage a kind of at effective resistance part two ends of electric current, the resistance dish of the effective resistance of resistance dishes, the probe of flowing through, and according to a kind of rotational position of judging camshaft 4 in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish of gathering, the probe of flowing through, resistance dish, and then judge the cylinder state of motor according to the rotational position of camshaft 4.
The principle of judgment means 1 of the present invention is: because motor has and whenever finishes a work cycle, the camshaft characteristic in (two weeks of crankshaft rotating) that only rotates a circle then, thereby can directly judge the state of cylinder 5 in the motor by the rotational position that detects camshaft 4.
In judgment means 1 of the present invention, as shown in Figure 3, resistance dish 6 comprises insulated part 12 and along the active component 11 that resistance dish circumferencial direction distributes and head and the tail disconnect, described active component 11 is used for electrically contacting with probe 7, and described insulated part 12 is used for resistance dish 6 is fixedly connected on camshaft 4.Because resistance dish 6 fixedlys connected with camshaft 4, thereby when motor has just started or is in the operation process, resistance dish 6 rotates synchronously with camshaft 4, that is to say, the rotation status of resistance dish 6 and camshaft 4 is identical.
Act as and the probe 7 of the active component 11 of resistance dish 6 can be realized electrically contacting, and probe 7 with respect to engine framework for fixing, thereby the track of probe 7 and active component 11 point of contact of resistance dish 6 is the circle coaxial with camshaft 4.
The weight of resistance dish 6 can not be too big, if too big then can increase the load of whole bent axle, thereby resistance dish 6 should be selected thin thickness, gets final product to satisfy the reality use.When probe 7 contacts with active component 11,, then be easy to cause the electrical signal error of extraction bigger, thereby be unfavorable for accurately judging the rotational position of camshaft if it is inhomogeneous to constitute the resistivity distribution of active component 11 materials.Thereby preferably, active component 11 is the ring resistance film that head and the tail disconnect, and membranaceous active component 11 has the surface resistivity of uniformity.
Why active component 11 is the shape that head and the tail disconnect, be because: if active component 11 is the annular of sealing, when then probe 7 electrically contacts around the circumferencial direction of full annular active component 11 and with active component 11, be difficult to guarantee to comprise the linear change (linear become big or linearity diminishes) of voltage at effective resistance part two ends of electric current, the resistance dish of the effective resistance of resistance dish, the probe of flowing through, thereby be difficult to determine and corresponding reference value when each cylinder of motor all is in top dead center or lower dead center respectively.And then, can not judge the rotational position of camshaft 4.
Resistive film as active component 11 can be made by the material of any conduction, preferably, in order to guarantee the reliability of active component 11 work, selects graphite or metallic material to make active component 11.
The active component 11 of annular gets final product reliably electrically contacting with probe 7 maintenances at width in the radial direction, and the scope of this width is: 1-5mm.
Acting as of insulated part 12 is fixedly connected on camshaft 4 with resistance dish 6, thereby guarantees that resistance dish 6 and camshaft 4 can keep rotation synchronously.Insulated part 12 can be all parts or the part except that active component 11 on the resistance dish 6, is convenient to that resistance dish 6 is fixedly connected on camshaft 4 and gets final product.Resistance dish 6 can be fixedlyed connected with camshaft 4 in several ways, as by tackiness agent, or by bearing etc., satisfy resistance dish 6 and get final product with camshaft 4 rotation synchronously.
In judgment means 1 provided by the invention, have potential difference between probe 7 and the active component 11, and after probe 7 and active component 11 electrically contact, between the two, have electric current and form.The size of this electric current depends on the potential difference between probe 7 and the active component 11 and the effective resistance of active component 11.In the present invention, need be to a kind of measurement the in the voltage at the effective resistance part two ends of the electric current of the effective resistance of resistance dish, the probe of flowing through, resistance dish, thus determine the rotational position of camshaft 4.
When probe 7 is contacted with different point of contact with active component 11, for effective resistance and the above-mentioned electric current that satisfies above-mentioned potential difference, active component 11 has enough sensitivity, in the preferred case, the numerical value of the potential difference between probe 7 and the active component 11 and the maximum resistance of active component 11 are in the same order of magnitude, further preferably, the maximum resistance of active component 11 is 10-50K Ω, the scope of the potential difference between probe 7 and the active component 11 is 3-10V, be connected with existing electronic equipment (as ECU) for convenience, be preferably 5V.
As shown in figures 1 and 3, active component 11 is the annular that head and the tail disconnect, when probe 7 and active component 11 electrically contact, because the resistance dish at active component 11 places is with camshaft 4 rotations, thereby probe 7 can be contacted with different point of contact with active component 11 along the circumferencial direction of annular, because active component 11 head and the tail disconnect, thereby the effective resistance of active component 11 is also different.Like this, in fact active component 11 is equivalent to the effect of a slide rheostat.Specifically, probe 7 is different with the point of contact of active component 11, then the effective resistance difference of active component 11, the flow through electric current difference of probe 7, and the voltage at the effective resistance part two ends of resistance dish 6 is also different, and the variation of all these electrical signal is linear.
Thereby a kind of in the voltage at electric current that can be by the effective resistance that detects the resistance dish, the probe of flowing through, the effective resistance part two ends of resistance dish determines the rotational position of camshaft 4, determines the state of cylinder in the motor then.
There is potential difference between probe 7 and the active component 11, like this, when probe 7 contacts with active component 11, just can between probe 7 and active component 11, producing electric current, thus a kind of in the voltage at the effective resistance part two ends of the electric current of effective resistance that can the measuring resistor dish, the probe of flowing through, resistance dish.
The realization of potential difference can be in several ways between probe 7 and the active component 11, as: the end ground connection with active component 11 makes probe 7 have the high petential that is higher than zero potential simultaneously; Perhaps make an end of active component 11 have the high petential that is higher than zero potential, make probe 7 ground connection simultaneously; Or an end of probe 7 and active component 11 is connected to the positive pole of power supply and negative pole etc.
Consider that active component 11 will together rotate with camshaft 4, thereby, for the ease of connecting active component 11, preferably, one end of active component 11 is electrically connected with camshaft 4 by current-carrying part 13, and the current potential of camshaft 4 is zero (ground connection), probe 7 is had be higher than zero high potential.Like this, realized the potential difference of probe 7 with active component 11.When as above connecting active component 11 with probe 7, the current potential of probe 7 is the voltage (current potential of resistance dish 6 one ends is zero, and the current potential of the other end is identical with the current potential of probe 7) at the effective resistance part two ends of resistance dish 6.
As shown in Figure 3, acting as with active component 11 of probe 7 electrically contacts.Probe 7 is made by the metallic material of the good conductor of electricity, as steel, alloyed steel, aluminium, copper etc.Preferably, have higher working life with assurance probe 7, and help to realize reliably electrically contacting between probe 7 and the active component 11 with alloyed steel or high-intensity aluminum alloy etc.
Whether thereby under preferential situation, described detection device also comprises prober controller 8, electrically contact with active component 11 in order to control probe 7.Under the control of prober controller 8, when not needing to judge in the motor cylinder state (when stopping as normal working of engine or motor), probe 7 does not contact with active component 11; Have only when judging action (when just having started as motor), probe 7 electrically contacts with active component 11, to realize current paths.
Under the preferable case, prober controller 8 is an electromagnet, and probe 7 has ferromagnetism, and as shown in Figure 1, resistance dish 6 is between prober controller 8 and probe 7.When not needing to judge cylinder state, the probe 7 that electromagnet no electric circuit, metallic material are made keeps appropriate spacing with the active component 11 of resistance dish 6 under the effect of self rigidity; When needs are judged cylinder state, coil electricity, coil can produce electromagnetic force, thereby attracts probe 7, and probe 7 and active component 11 are electrically contacted.
As shown in Figure 1, by cable 9 controls, switch 2 can be the enable switch of automobile to electromagnet by switch 2, like this, when automobile one starts, just can judge the state of cylinder.Switch 2 can also be controlled by ECU, perhaps is other switching device such as hand switch, can decide according to the needs of judging cylinder state.
As shown in Figure 1, probe 7 is connected in the positive pole of power supply by resistance R, and the negative pole of power supply is connected in camshaft 4, and camshaft 4 is electrically connected on active component 11, thereby, when probe 7 contacts with active component 11, can form the loop immediately, as shown in Figure 4.
In Fig. 4; the Vcc Hot end is connected in slide rheostat R1 by protective resistance R, and R1 is connected in the VBD cold end then, wherein; slide rheostat R1 is the active component 11 of resistance dish 6, and the maximum resistance of slide rheostat R1 is the maximum resistance of the active component 11 of resistance dish 6.
As shown in Figure 2, the probe 7 of detection device is connected in signal processing apparatus 3 by signaling line 10.
Signal receiving unit is electrically connected with described active component 11 by probe 7, be used for gathering voltage a kind of at effective resistance part two ends of electric current, the resistance dish 6 of the effective resistance of resistance dishes 6, the probe 7 of flowing through by probe 7, and with a kind of signal analysis unit that sends in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish 6 gathered, the probe 7 of flowing through, resistance dish 6.
Signal analysis unit is used for a kind of and predetermined reference value of the voltage at the effective resistance part two ends of the electric current of the effective resistance of resistance dish 6, the probe 7 of flowing through, resistance dish 6 is compared, according to comparative result, judge the rotational position of camshaft 4, and then judge the cylinder state of motor according to the rotational position of camshaft 4.
In a work cycle of motor, the rotational position of camshaft is corresponding with cylinder state, and when 6 contacts of probe 7 and resistance dish the rotational position of camshaft also the effective resistance (voltages at the effective resistance part two ends of the electric current of the probe 7 of flowing through and resistance dish 6) with resistance dish 6 is corresponding, thereby, can between the effective resistance of resistance dish 6 and cylinder state, set up corresponding relation.
The purpose that predetermined reference value is set is: set up mutually benchmark relatively between the effective resistance (voltages at the effective resistance part two ends of the electric current of the probe 7 of flowing through and resistance dish 6) of resistance dish 6 and cylinder state, like this, when obtaining the effective resistance value of resistance dish 6 at random, can be by comparing with this benchmark, thus judge the state of the cylinder of motor this moment.
Because in a work cycle of motor, the igniting of each cylinder is spaced apart uniformity, thereby, when each cylinder in the motor arrives identical state successively (when reaching top dead center respectively) as each cylinder, each is spaced apart uniformity between constantly, that is to say that the angle that camshaft 4 rotates through also is a uniformity.Thereby in a work cycle of motor, camshaft 4 revolves three-sixth turn, and then the moment that reaches equal state respectively of each cylinder in the motor evenly separates 360 degree of the camshaft 4 rotations ignition orders according to cylinder.For example, in four cylinder engine, ignition order is 1-3-4-2, supposes that the 1st cylinder is in top dead center constantly, and camshaft 4 begins rotation (angle of swing is 0); When then the 3rd cylinder was in top dead center, camshaft 4 rotated through 90 degree; When the 4th cylinder was in top dead center, camshaft 4 rotated through 90 degree (rotating through 180 degree altogether) again; When the 2nd cylinder was in top dead center, camshaft 4 rotated through 90 degree (rotating through 270 degree altogether) again; Finish this circulation time, the 1st cylinder is in top dead center again, and camshaft rotates through 90 degree (having rotated 360 degree altogether) again.
Like this, the moment that reaches equal state with each cylinder in the motor respectively is corresponding, when probe 7 was contacted with different contacts with resistance dish 6, the voltage at the electric current of effective resistance, the probe 7 of flowing through of the resistance dish 6 of this moment and the effective resistance part two ends of resistance dish 6 evenly separated the maximum voltage at the effective resistance part two ends of the maximum current of the maximum resistance of resistance dish 6, the probe 7 of flowing through or resistance dish 6 respectively.
Thereby, predetermined reference value is that a kind of K/N and deviation is not more than 5% in the maximum voltage at effective resistance part two ends of the maximum current of the maximum resistance of resistance dish 6, the probe 7 of flowing through or resistance dish 6, N is the number of cylinder in the motor, K is more than or equal to 1 and smaller or equal to the integer of N, for example, for six cylinder engine, N=6, K are 1,2,3,4,5 or 6.
In the preferred case, when each cylinder be in respectively top dead center or down to the point state the time, measure the voltage at the effective resistance part two ends of the electric current of the effective resistance of corresponding resistance dish 6 this moment, the probe 7 of flowing through and resistance dish 6, and with the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish 6 measured, the probe 7 of flowing through and resistance dish 6 as predetermined reference value.
When the voltage of considering the effective resistance part two ends of the electric current of the effective resistance to resistance dish 6, the probe 7 of flowing through and resistance dish 6 is measured, can there be accuracy problems inevitably, thereby, with the deviation setting of this predetermined reference value is 5%, thereby can guarantee the precision that detects, can not influence the proper functioning of judgment means 1 provided by the invention again.
In a work cycle of motor, camshaft 4 rotates a week, and simultaneously, each cylinder of motor reaches top dead center or lower dead center successively according to ignition order.Like this, arrive the moment of top dead center or lower dead center successively according to ignition order according to each cylinder in the motor, rotating a circle of camshaft 4 can be divided into equal equal portions, the number of these equal portions equals the number of cylinders of motor, can be divided into four equal portions as four cylinder engine; Six cylinder engine can be divided into six equal portions.
And when making probe 7 and active component 11 be contacted with diverse location when camshaft 4 rotation, this moment, the effective resistance of active component 11 must or be certain reference value (electric current of the current potential of probe 7 and the probe 7 of flowing through and the effective resistance of active component 11 are similar) between certain two reference value of above-mentioned several reference values, thereby can learn the rotational position of camshaft 4 this moment easily according to above-mentioned comparison.
Below, describe the determination methods of cylinder state in the judgement motor provided by the invention in detail, wherein, this determination methods comprises:
The active component 11 of resistance dish 6 is contacted with probe 7, have potential difference between the active component 11 of resistance dish 6 and the probe 7;
Gather a kind of in the voltage at effective resistance part two ends of electric current, resistance dish 6 of the effective resistance of resistance dishes 6, the probe 7 of flowing through by probe 7, and relatively with a kind of and predetermined reference value in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish 6 gathered, the probe 7 of flowing through, resistance dish 6, thereby judge the rotational position of camshaft 4, and then judge the cylinder state according to the rotational position of camshaft 4.
In method provided by the invention, at first resistance dish 6 is installed, to be used for actual use subsequently.
Have potential difference between the active component 11 of resistance dish 6 and the probe 7, thereby, when the active component 11 of resistance dish 6 contacts with probe 7, can produce electric current, thereby realize circuit shown in Figure 4.
When forming circuit, gather a kind of in the voltage at effective resistance part two ends of the electric current of the effective resistance of resistance dishes 6, the probe 7 of flowing through and resistance dish 6 by probe 7, and relatively with a kind of and predetermined reference value in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish 6 gathered, the probe 7 of flowing through, resistance dish 6, thereby judge the rotational position of camshaft 4, and then judge the cylinder state according to the rotational position of camshaft 4.
Predetermined reference value is that a kind of K/N and deviation is not more than 5% in the maximum voltage at effective resistance part two ends of the maximum current of the maximum resistance of resistance dish 6, the probe 7 of flowing through or resistance dish 6, N is the number of cylinder in the motor, and K is more than or equal to 1 and smaller or equal to the integer of N.Described in detail explanation about above the determining of predetermined reference value, no longer be described at this.
Under the preferable case, when each cylinder in the motor is in top dead center or lower dead center respectively, detect a kind of in the voltage at effective resistance part two ends of the electric current of the effective resistance of resistance dish 6, the probe 7 of flowing through and resistance dish 6, with a kind of reference value that is set in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the collection resistance dish 6 gathered, the probe 7 of flowing through and resistance dish 6.
Under the preferable case, because the current potential of detector probe 7 more accurately, conveniently, thereby, being electrically connected on current potential at an end of resistance dish 6 is zero camshaft 4, and the current potential of probe 7 is higher than under the zero situation, when each cylinder in the motor is in top dead center or lower dead center respectively, and the current potential of detector probe 7, with the potential setting of probe 7 is reference value, and this reference value is sent and be stored to signal processing apparatus.
Under the preferable case, probe 7 is shaft-like, is made by the metal of the good conductor of electricity, so that electrically contact with active component 11.
When needs are judged in the motor cylinder state, probe 7 is electrically connected with active component 11, signal processing apparatus receives the current potential of probe 7, and judge the current potential of described probe 7 and the relation of described reference value, thereby obtain analysis result, and send command signal according to this analysis result, this command signal is passed to motor again.
In motor, the ignition order of cylinder is linear corresponding with the rotation of camshaft.Thereby putting in order of above-mentioned reference value is identical with the ignition order of each cylinder in the motor.In other words, each reference value is with the state of cylinder is corresponding accordingly separately.
As mentioned above, principle of the present invention is: the state of directly judging cylinder in the motor by the rotational position that detects camshaft 4.And in the present invention, the rotational position of camshaft 4 is determined by the electrical signal that detects in the above-mentioned loop.
As everyone knows, the ignition order of the cylinder in the motor is had nothing in common with each other, as: in the in-line four cylinder motor, ignition order can be 1-3-4-2; In the in-line arrangement six cylinder engine, ignition order can be 1-5-3-6-2-4.And in a work cycle, this characteristic that camshaft rotates a circle, all irrelevant with the number (four cylinders, six cylinders or eight cylinders) of cylinder in arrangement mode of motor (in upright arrangement, V-type or W type) and the motor.Thereby, provided by the inventionly be used for judging that the judgment means of motor cylinder state and method all are applicable to above-mentioned any motor.
With the four cylinder engine is example, and as shown in Figure 5, if camshaft 4 scale starting points begin to turn clockwise from A (0 degree), at this moment, the 1st, 4 cylinders are positioned at top dead center (or lower dead center); When arriving B (rotating through 90 degree), the 3rd, 2 cylinders are positioned at top dead center (or lower dead center); When arriving C (rotating through 180 degree), the 4th, 1 cylinder is positioned at top dead center (or lower dead center); When arriving D (rotating through 270 degree), the 2nd, 3 cylinders are positioned at top dead center (or lower dead center); When getting back to A (rotating through 360 degree) again, motor is finished a work cycle.
Specifically, as Fig. 3 and shown in Figure 5, when the point of contact of probe 7 and active component 11 is positioned at A, at this moment, the 1st, 4 cylinders are in top dead center or lower dead center, because probe 7 almost directly is electrically connected with extension 13, thereby, this moment active component 11 the effective resistance minimum; When the point of contact of probe 7 and active component 11 was positioned at B, this moment, the 3rd, 2 cylinders were in top dead center or lower dead center, and the effective resistance of active component 11 is the summation of BC section, CD section and the DA section of active component 11; When the point of contact of probe 7 and active component 11 was positioned at C, this moment, the 4th, 1 cylinder was in top dead center or lower dead center, and the effective resistance of active component 11 adds the summation of DA section for the CD section at this moment; When the point of contact of probe 7 and active component 11 was positioned at D, this moment, the 2nd, 3 cylinders were in top dead center or lower dead center, and this moment, the effective resistance of active component 11 was the DA section.As from the foregoing, when probe 7 contacts with the different parts of active component 11, the effective resistance of active component 11 is also different, and the rotational position of the variation of the effective resistance of active component 11 and camshaft 4 is linear corresponding relation, thus the variation of the effective resistance of active component 11 also with motor in the state of cylinder linear corresponding.
And, when the point of contact of probe 7 and active component 11 is between AB, between the BC, between the CD or between the DA, the state of cylinder is respectively: the 1st cylinder is in that top dead center or lower dead center and the 3rd cylinder are between top dead center or the lower dead center, the 3rd cylinder is in top dead center or lower dead center and the 4th cylinder is between top dead center or the lower dead center, the 4th cylinder is in top dead center or lower dead center and the 2nd cylinder are between top dead center or the lower dead center, or the 2nd cylinder is in top dead center or lower dead center and the 1st cylinder and is between top dead center or the lower dead center.
As Fig. 3, Fig. 4 and shown in Figure 5, when the point of contact of probe 7 and active component 11 is positioned at A, the current potential minimum of probe 7 then, this moment, cylinder 1 was positioned at top dead center or lower dead center; When the point of contact of probe 7 and active component 11 is positioned at insulated part 12 above A, the circuit breaker among Fig. 4, then the current potential of probe 7 equals the potential difference of probe 7 and active component 11; When the point of contact of probe 7 and active component 11 was between insulated part 12 and B, the current potential of probe 7 was bigger, but less than the potential difference of probe 7 with active component 11; The rest may be inferred, and the current potential of probe 7 descends gradually, is contacted with A with active component 11 again until probe 7.
As mentioned above, be positioned at top dead center separately successively according to ignition order or during lower dead center, each potential value of probe 7 is divided into each self-corresponding zone with the potential range of described probe 7 when each cylinder.
In sum, can determine the effective resistance of active component 11 and the corresponding relation of cylinder state at an easy rate, thereby also have linear corresponding relation between the cylinder state of the current potential of probe 7 and motor.Promptly, in circuit as described in Figure 4, the current potential of the effective resistance of active component 11 and probe 7 is a linear corresponding relation, thereby can easily determine the linear corresponding relation of cylinder state in the current potential of probe 7 and the motor, thereby can easily directly determine the state of cylinder in the motor according to the potential value of probe 7.
In the foregoing description, with the in-line four cylinder motor is that example is illustrated, yet, in the present invention, arrangement mode, number of cylinders and cylinder ignition order for cylinder in the motor are unqualified, those of ordinary skill in the art should be understood that judgment means 1 provided by the invention and determination methods are applicable to and anyly satisfies motor and finish the then motor that rotates a circle of camshaft of a work cycle.
The process that judgment means 1 of the present invention is judged following (as Fig. 1, Fig. 2 and shown in Figure 6):
When needs are judged in the motor cylinder state, judge whether switch 2 is connected, if not connection is then declared cylinder assembly and do not worked, do not declare cylinder; If switch 2 is connected, then active component 11 adhesives (electrically contacting) of probe 7 and resistance dish 6, the current potential of probe 7 when this position that records probe 7 and active component 11 electrically contacts, this electric potential signal is transferred to signal processing apparatus 3 by signaling line 10 then;
In signal processing apparatus 3, the reference potential value that the current potential of the probe 7 that records and signal processing apparatus 3 store is in advance compared, and judge the rotational position of camshaft 4, and then determine the state of cylinder in the motor according to the current potential of probe 7 and the linear corresponding relation of cylinder state;
According to the judgment means and the determination methods of cylinder state in the judgement motor provided by the invention, can judge cylinder state immediately by the current potential of detector probe 7, thereby the motor that has overcome prior art can not quick and precisely be declared the defective of cylinder when starting.
Embodiment
Be that example illustrates a kind of embodiment of the present invention with BYD 483 h type engine hs below.BYD 483 h type engine hs are 4 Cylinder engines, and ignition order is 1-3-4-2, and camshaft 4 is for turning clockwise.
The resistance value of active component 11 is 30K Ω.Be electrically connected because active component 11 and current potential are zero camshaft 4, thereby the current potential of active component 11 is zero.
On resistance dish 6, the remainder except active component 11 is an insulated part 12, and the material of insulated part 12 is high temperature resistant high hardness resin.Insulated part 12 has center hole, and camshaft 4 passes from this center hole, and insulated part 12 is connected on the camshaft 4 by the RITELOK bearing fixing, thereby realizes fixedlying connected of insulated part 12 and camshaft 4, and resistance dish 6 is fixedly connected on camshaft 4.
Signal processing device is changed to ECU3 (Renesas M32176F4VFP).
Ato unit, the camshaft 4 of motor begin rotation, and the resistance dish 6 that is fixedly connected on camshaft 4 simultaneously together rotates with camshaft 4.At this moment, ignition switch 2 is connected, and electromagnet 8 energisings produce electromagnetic force, attract probe 7, and probe 7 is electrically connected with active component 11.
As shown in Figure 5, when probe 7 and active component 11 were contacted with A, B, C and D respectively, the effective resistance of active component 11 was (as a following table 1):
| The contact of |
A | B | C | D |
| The effective resistance of active component 11 (unit: K Ω) | 0 | 7 | 15 | 22 |
| The state of cylinder in the motor | The 1st cylinder is in top dead center | The 3rd cylinder is in top dead center | The 4th cylinder is in top dead center | The 2nd cylinder is in top dead center |
Table 1
When probe 7 and active component were contacted with A, B, C and D respectively, the potential value of probe 7 was (as a following table):
| The contact of |
A | B | C | D |
| The current potential of probe 7 (reference potential value) | 0.1 | 1.16 | 2.5 | 3.6 |
| The contact of |
A | B | C | D |
| (unit: V) |
Table 2
When needs were judged in the motor cylinder state, switch 2 was connected, then active component 11 adhesives (electrically contacting) of probe 7 and resistance dish 6, and the current potential of probe 7 was 2.02V when this position that records probe 7 and active component 11 electrically contacted;
Then this electric potential signal (current potential of probe 7 is 2.02V) is transferred to ECU3 by signaling line 10;
In ECU3, this electric potential signal (current potential of probe 7 is 2.02V) and the reference potential value in the table 2 are compared, because 1.16 (C)＜2.02＜2.5 (D), thereby, the state of cylinder is in this moment motor: the piston in the 3rd cylinder and can move to continuing lower dead center between top dead center and lower dead center, and, piston in the 4th cylinder and can continue to move to top dead center between top dead center and lower dead center;
ECU3 sends correct firing command according to above-mentioned judged result to motor then, sends the signal that probe 7 is separated with active component 11 electricity simultaneously;
Claims (16)
1. judgment means of judging the cylinder state, this judgment means comprises detection device and signal processing apparatus, it is characterized in that, this judgment means also comprises resistance dish (6), described resistance dish (6) has insulated part (12) and along the active component (11) that resistance dish (6) circumferencial direction distributes and head and the tail disconnect, described insulated part (12) is used for resistance dish (6) is fixedly connected on camshaft (4);
Described detection device comprises probe (7), and described probe (7) is used for contacting with described active component (11), described probe (7) and active component (11) so that electric current can be flowed through;
Described signal processing apparatus is used for gathering by probe (7) voltage a kind of at effective resistance part two ends of electric current, the resistance dish (6) of effective resistance, the probe of flowing through (7) of resistance dish (6), and according to the rotational position of a kind of judgement camshaft (4) in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish of gathering (6), the probe of flowing through (7), resistance dish (6), and then judge the cylinder state according to the rotational position of camshaft (4).
2. the judgment means of judgement cylinder state according to claim 1, wherein, described resistance dish (6) is and the coaxial disc of camshaft (4).
3. the judgment means of judgement cylinder state according to claim 1, wherein, described active component (11) is the ring resistance film that head and the tail disconnect, the surface resistivity uniformity of described active component (11).
4. the judgment means of judgement cylinder state according to claim 3, wherein, the material of described active component (11) is graphite or metal.
5. the judgment means of judgement cylinder state according to claim 3, wherein, described active component (11) is the 1-5 millimeter at resistance dish (6) width in the radial direction.
6. the judgment means of judgement cylinder state according to claim 3, wherein, the resistance sizes of described active component (11) is 10-50 kilo-ohm, the potential difference that has between described probe (7) and the active component (11) is the 3-10 volt.
7. according to the judgment means of claim 3 or 6 described judgement cylinder states, wherein, an end of described active component (11) and current potential are that zero camshaft (4) is electrically connected, and the current potential of described probe (7) is higher than zero.
8. the judgment means of judgement cylinder state according to claim 1, wherein, described detection device also comprises prober controller (8), whether the active component (11) that this prober controller (8) is used to control probe (7) and resistance dish (6) electrically contacts.
9. the judgment means of judgement cylinder state according to claim 8, wherein, described prober controller (8) is an electromagnet, described probe (7) has ferromagnetism.
10. the judgment means of judgement cylinder state according to claim 1, wherein, described signal processing device is changed to electronic control unit.
11. according to the judgment means of claim 1 or 10 described judgement cylinder states, wherein, described signal processing apparatus comprises signal receiving unit and signal analysis unit;
Described signal receiving unit is electrically connected with described active component (11) by probe (7), be used for gathering voltage a kind of at effective resistance part two ends of electric current, the resistance dish (6) of effective resistance, the probe of flowing through (7) of resistance dish (6) by probe (7), and with a kind of signal analysis unit that sends in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish (6) gathered, the probe of flowing through (7), resistance dish (6);
Described signal analysis unit is used for a kind of and predetermined reference value of the voltage at the effective resistance part two ends of the electric current of the effective resistance of resistance dish (6), the probe of flowing through (7), resistance dish (6) is compared, according to comparative result, judge the rotational position of camshaft (4), and then judge the cylinder state according to the rotational position of camshaft (4).
12. the judgment means of judgement cylinder state according to claim 11, wherein, described predetermined reference value is that a kind of K/N and deviation is not more than 5% in the maximum voltage at effective resistance part two ends of the maximum current of the maximum resistance of resistance dish (6), the probe of flowing through (7) or resistance dish (6), N is the number of cylinder in the motor, and K is more than or equal to 1 and smaller or equal to the integer of N.
13. the determination methods of a cylinder state, wherein, this method comprises:
Resistance dish (6) is fixedly installed in described camshaft (4), the active component (11) that described resistance dish (6) has insulated part (12) and distributes and disconnect from beginning to end along resistance dish (6) circumferencial direction, by described insulated part (12) is sleeved on the camshaft (4), make resistance dish (6) be fixedly installed in described camshaft (4);
The active component (11) of resistance dish (6) is contacted with probe (7), have potential difference between the active component (11) of resistance dish (6) and the probe (7);
Gather a kind of in the voltage at effective resistance part two ends of electric current, resistance dish (6) of effective resistance, the probe of flowing through (7) of resistance dish (6) by probe (7), and relatively with a kind of and predetermined reference value in the voltage at the effective resistance part two ends of the electric current of the effective resistance of the resistance dish (6) gathered, the probe of flowing through (7), resistance dish (6), thereby judge the rotational position of camshaft (4), and then judge the cylinder state according to the rotational position of camshaft (4).
14. determination methods according to claim 13, wherein, described active component (11) is the ring resistance film that head and the tail disconnect, the surface resistivity uniformity of described active component (11).
15. determination methods according to claim 13, wherein, it is zero camshaft (4) that an end of described active component (11) is electrically connected on current potential, and the current potential of probe (7) is higher than zero.
16. determination methods according to claim 13, wherein, described predetermined reference value is that a kind of K/N and deviation is not more than 5% in the maximum voltage at effective resistance part two ends of the maximum current of the maximum resistance of resistance dish (6), the probe of flowing through (7) or resistance dish (6), N is the number of cylinder in the motor, and K is more than or equal to 1 and smaller or equal to the integer of N.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100004996A CN101255826B (en) | 2007-02-28 | 2007-02-28 | Judgment apparatus and method for judging cylinder state in engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100004996A CN101255826B (en) | 2007-02-28 | 2007-02-28 | Judgment apparatus and method for judging cylinder state in engine |
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| CN101255826B true CN101255826B (en) | 2010-10-06 |
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| CN104074607B (en) * | 2013-03-28 | 2016-10-26 | 比亚迪股份有限公司 | Piston stop position detects device and has electromotor and the vehicle of this device |
| CN103953451B (en) * | 2013-05-24 | 2016-07-13 | 潍柴动力股份有限公司 | Obtain the method for engine cut-off cylinder number, device and electromotor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1441158A (en) * | 2002-02-26 | 2003-09-10 | 株式会社电装 | Engine control equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1441158A (en) * | 2002-02-26 | 2003-09-10 | 株式会社电装 | Engine control equipment |
Non-Patent Citations (5)
| Title |
|---|
| JP昭58-99702A 1983.06.14 |
| JP特开2000-186906A 2000.07.04 |
| JP特开平9-269204A 1997.10.14 |
| 严兆大.热能与动力机械测试技术 第1版.机械工业出版社,1999,55-56. |
| 严兆大.热能与动力机械测试技术 第1版.机械工业出版社,1999,55-56. * |
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