CN101435731B - Combustion pressure detecting apparatus - Google Patents
Combustion pressure detecting apparatus Download PDFInfo
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- CN101435731B CN101435731B CN2008101816596A CN200810181659A CN101435731B CN 101435731 B CN101435731 B CN 101435731B CN 2008101816596 A CN2008101816596 A CN 2008101816596A CN 200810181659 A CN200810181659 A CN 200810181659A CN 101435731 B CN101435731 B CN 101435731B
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Abstract
The invention provides a combustion pressure detecting apparatus for improving combustion pressure detection accuracy and prolonging the service life. The combustion pressure detecting apparatus is mounted in a mounting hole of a cylinder head together with a combustion device for detecting the pressure within a combustion chamber as a combustion pressure. The combustion device may be one of an injector for injecting a fuel and a spark plug for igniting an air/fuel mixture within the combustion chamber. The combustion pressure detecting apparatus comprises sensor components, their installation in the hole, as described for detecting the pressure of combustion chamber; cable, its connections with the sensor element, along with the exhaust above an extension of the opposite direction, and the output from the sensor elements described in detection signal.
Description
The present invention is that application number is 200510089927.8, and the applying date is on August 4th, 2005, and denomination of invention is divided an application for the Chinese invention patent application of " combustion pressure detecting apparatus ".
Technical field
The present invention relates to a kind of combustion pressure detecting apparatus that is installed on the internal combustion engine, detects the pressure in the firing chamber.
Background technology
Combustion pressure detecting apparatus in the past, for example known have a disclosed device of japanese patent laid-open 10-18898 communique.This pick-up unit is located on the direct injection ic engine, utilizes to be clamped in the formations such as ring-type differential pressure pick-up between thrower and the cylinder head, and this thrower is installed on the cylinder head of engine.Thrower is used for being ejected into the fuel that is boosted to high pressure by petrolift in the firing chamber, and its spray orifice portion passes through the hole of cylinder head facing to the firing chamber.In addition, differential pressure pick-up utilizes formations such as piezoelectric element, exports the detection signal corresponding with the loading that is applied to it.According to the pick-up unit of such formation, thrower produces displacement according to the pressure in the firing chamber (below be called " combustion pressure "), and therewith accordingly, the loading that acts on differential pressure pick-up from thrower also changes.Differential pressure pick-up detects the variation of the variation of this loading as combustion pressure, and output detection signal.
But, in the disclosed combustion pressure detecting apparatus of above-mentioned japanese patent laid-open 10-18898 communique, have following problem.That is, in this pick-up unit, because the retroaction when thrower imports fuel under high pressure and burner oil etc., the loading that acts on differential pressure pick-up produces change (below be called " combustion pressure change ").And, because this combustion pressure change passes to differential pressure pick-up from thrower, thus the combustion pressure variance components contained in the combustion pressure that utilizes differential pressure pick-up to detect, the result, the combustion pressure detection precision reduces.
And differential pressure pick-up is used to export and the loading that is applied to it changes corresponding detection signal, so in order to keep its accuracy of detection, need not be set at appropriate value as the initial loading of benchmark there being combustion pressure to do the time spent.But, thrower for example since maintenance etc. need dismantle and change sometimes, so when being installed to thrower on the cylinder head once more, initial loading might depart from appropriate value, under this situation, is difficult to keep accuracy of detection.
And, other combustion pressure detecting apparatus in the past, for example known have Japanese Patent Laid to open the disclosed device of 2002-168722 communique.This pick-up unit and spark plug are located on the consent that is formed on the cylinder head together.Consent is configured between air intake opening and the exhausr port, and extends to form along the vertical direction and have the more mounting hole of minor diameter, and this mounting hole is communicated with the bottom of this consent.Spark plug is installed through screwing in its installing component in the mounting hole, and its bottom is facing to the firing chamber.
End difference at the intersection of consent and mounting hole is provided with the circular pressure sensor element.Specifically, this pressure sensor component is clamped between flange shape sensor support portion and the above-mentioned end difference, and wherein this sensor support portion is formed at the outer peripheral face of installing component.And, in consent, being provided with the plug pipe, the inner face of managing at this plug is formed with the groove that extends along the length direction of plug pipe.In addition, pressure sensor component is connected with the sensor output lead, and this sensor output lead extends to the outside of consent through the groove of consent.
According to this combustion pressure detecting apparatus, along with combustion pressure changes, the loading that acts on pressure sensor component through spark plug changes.Pressure sensor component detects this loading and changes the variation as combustion pressure, and through sensor output lead output detection signal.
But, open in the disclosed combustion pressure detecting apparatus of 2002-168722 communique in above-mentioned Japanese Patent Laid and to have following problem.That is, the sensor output lead passes through in consent, thereby its length is elongated, so the operability when for example assembling and keeping in repair reduces.And,, cause cylinder head to become high temperature easily owing to the heat that the burning of following in the firing chamber produces.Particularly because consent is configured in the exhausr port position adjacent that high-temperature exhaust air passed through with cylinder head usually, so receive the influence of the heat of exhaust easily.And, because the sensor output lead extends along the consent length direction,, receive the influence of heat easily so the part that is exposed under the high temperature in the sensor output lead is elongated in this consent, therefore may not detect combustion pressure exactly.
Summary of the invention
The present invention proposes in order to address the above problem, and its purpose is, a kind of combustion pressure detecting apparatus that can improve the combustion pressure detection precision is provided.
In order to achieve the above object; According to the 1st aspect of the present invention; A kind of combustion pressure detecting apparatus is provided; It is located at mounting hole with thrower that is used for burner oil and the side that is used for the spark plug of the indoor air fuel mixture of ignition combustion, and this mounting hole is used for installing a side of the thrower and the spark plug of cylinder head, and this combustion pressure detecting apparatus detects as the pressure in the firing chamber of combustion pressure.This combustion pressure detecting apparatus is characterised in that to have: the sensor fixed part, and it is to be located in the mounting hole facing to firing chamber and the state that cuts off from the side's in thrower and the spark plug loading; Sensor element, it is fixed between this sensor fixed part and the cylinder head through the sensor fixed part, and the loading of detection through the transmission of sensor fixed part is as combustion pressure.
According to this combustion pressure detecting apparatus, the sensor fixed part is located in the mounting hole of cylinder head with device (that is the side in thrower and the spark plug) with burning together.The sensor fixed part is facing to the firing chamber, and sensor element is fixed between this sensor fixed part and the cylinder head through this sensor fixed part.Pass to sensor element to combustion pressure as loading through this sensor fixed part, the loading on it of sensor element detection effect is as combustion pressure.
In addition; Because the sensor fixed part is configured to cut off the state of spontaneous combustion with the loading of device; And sensor element is fixed on through this sensor fixed part and cylinder head between; So even the combustion pressure of thrower etc. produces change, the loading change that causes therefrom can not feed through to sensor element yet.Thus, can from detection signal, get rid of the combustion pressure variance components, the detection signal of being exported only reflects combustion pressure, so can improve the combustion pressure detection precision.
And, owing to come spontaneous combustion to be cut off, to burn when using device so for example load and unload, change for maintenance with the loading transmission of device, therefore the initial loading that also can keep sensor element can guarantee the combustion pressure detection precision.Usually, intensive air intake opening, exhausr port etc., the excess room that does not have to append new component parts of disposing on cylinder head.To this, above-mentioned combustion pressure detecting apparatus utilizes existing structure promptly to burn and is provided with the device mounting hole, therefore hardly with the structure, the layout that change internal combustion engine, just can form cramped construction on the whole.
In said combustion pressure detecting apparatus, the preferred sensor fixed part with and the burning be arranged in the mounting hole with the state that has the gap between the device.
According to this optimal way of combustion pressure detecting apparatus, the sensor fixed part with and the burning be arranged in the mounting hole with the state that has the gap between the device.Promptly; The sensor installing component is used device isolation with burning; Can cut off the loading that the combustion pressure change owing to thrower etc. causes thus reliably and since only based on the load effect of combustion pressure in sensor element, so can improve the combustion pressure detection precision.
In said combustion pressure detecting apparatus; Preferably: sensor element is housed in the sensor that is formed on the cylinder head and installs in the recess; This combustion pressure detecting apparatus also has the support component of the burning supported with device; This support component and sensor element are set up in parallel at the axis direction of mounting hole, and are clamped in burning with between device and the cylinder head.
According to this optimal way of combustion pressure detecting apparatus, on cylinder head, form sensor recess is installed, install in the recess at this sensor and accommodating sensor element.And, between burning is with device and cylinder head, being provided with support component, its axis direction and sensor element at mounting hole is arranged side by side, and promptly covering sensor is installed recess, and this support component is held burning with between device and the cylinder head.Thus, thrower passes through support member supports on cylinder head.
According to this structure; Component parts such as sensor element and support component is located at the axis direction of mounting hole side by side; Because can be on the basis of not destroying aforementioned effect; Make combustion pressure detecting apparatus, particularly with the compact dimensionsization of the direction of the axis quadrature of mounting hole, can on the basis of the existing structure that does not change internal combustion engine, dispose combustion pressure detecting apparatus.And; Because support component is clamped in burning with between device and the cylinder head; And do not have other component parts at support component with between burning with device, so can guarantee bigger contact area between the two, can burning be installed on the cylinder head with stable status with device.
According to other aspects of the invention; A kind of combustion pressure detecting apparatus is provided; Its burning is located on the cylinder head with device together; And the pressure in the detection firing chamber is as combustion pressure, and this burner is for the thrower that is used for burner oil and be used for a side of the spark plug of the indoor air fuel mixture of ignition combustion, and this cylinder head has respectively air intake opening and the exhausr port at a side and another lateral opening.On cylinder head,, be formed with and be used for install combustion and use the device mounting hole in a said relatively air intake opening side opposite and at the lower position of said air intake opening with said exhausr port.This combustion pressure detecting apparatus is characterised in that to have: sensor element, and it is located in the mounting hole, is used to detect the pressure in the firing chamber; Cable, it is connected with sensor element, and the edge direction opposite with exhausr port extended, and output is from the detection signal of sensor element.
According to this combustion pressure detecting apparatus, in being formed at the mounting hole of cylinder head simultaneously install combustion with device (that is the side in thrower and the spark plug) and sensor element.Mounting hole is configured in a relative air intake opening side opposite with exhausr port and is the lower position at air intake opening, promptly is configured in apart from exhausr port position far away.And the cable that is connected with sensor element extends to the direction opposite with exhausr port.Pressure in the sensor element detection firing chamber is exported through cable from the detection signal of sensor element as combustion pressure.
According to this structure, different with consent in the past, because mounting hole is extended between air intake opening and exhausr port along the vertical direction, so can make consent be shorter than consent in the past.And,,, can further shorten size so in consent, compare along the situation of its length direction extension with such in the past because cable extends to the direction opposite with exhausr port from this mounting hole.The operability of the cable in the time of thus, can improving assembling and maintenance etc.And, owing to mounting hole is configured in apart from exhausr port position far away, and the cable direction extension opposite with exhausr port from this mounting hole edge, so the influence of the heat of exhaust is difficult to feed through to cable.As a result, cable is difficult for being exposed under the high temperature, thereby can prolong its life-span.
In the previous combustion pressure-detecting device; Preferably: on cylinder head, form cable and derive groove; It extends towards a side opposite with exhausr port from mounting hole, and is opened on the outside surface of cylinder head, and cable is derived the outside that groove extends to cylinder head through cable.
According to this optimal way of combustion pressure detecting apparatus, the cable of sensor element is derived the outside that groove extends to cylinder head through the cable that is formed at cylinder head.This cable is derived groove and is extended to the direction opposite with exhausr port from mounting hole, and is opened on the outside surface of cylinder head.Thus, can cable be derived groove through cable and stably derive, and can not produce the offset etc. of cable in the direction opposite with exhausr port.Therefore, can stably remain on the state that heat affecting is difficult to feed through to cable.
In the previous combustion pressure-detecting device, preferably: in mounting hole, be provided for supporting the support component of burning, be formed for the lead division of outgoing cable in the part in the face of cable derivation groove of support component with device.
This optimal way according to combustion pressure detecting apparatus is provided with support component in mounting hole, burning is installed in the mounting hole with the state by support member supports with device.And cable can be through the deriving the lead division that the part of groove forms in the face of cable and derive of support component, so for example under with the situation of cable near the support component configuration, cable is difficult for contacting, rubbing with support component, so that cable is difficult for is impaired.Therefore, the arrangement freedom of cable can be improved, and the life-span of cable can be prolonged.
In the previous combustion pressure-detecting device, preferred cable is derived groove and is extended from the bottom of mounting hole.
According to this optimal way of combustion pressure detecting apparatus, cable is derived groove and is extended from the bottom of mounting hole, and cable is derived the outside that groove extends to cylinder head through this cable.Like this,, cable is configured in apart from air intake opening position far away because deriving groove, thus can easily carry out the processing of cable, and can not receive the obstruction of air intake opening.And, because can guarantee and exhausr port between greater distance, can further suppress influence from the heat of exhausr port.
Description of drawings
Fig. 1 is the fragmentary cross-sectional view of the engine of expression combustion pressure detecting apparatus and thrower that the 1st embodiment of the present invention has been installed.
Fig. 2 is the stereographic map of the cylinder head of engine shown in the presentation graphs 1 under the state that combustion pressure detecting apparatus and thrower have been installed.
Fig. 3 is near the part amplification profile of thrower of presentation graphs 1.
Fig. 4 is near the part amplification stereogram of thrower of presentation graphs 2.
Fig. 5 is the combustion pressure detecting apparatus of expression the 1st embodiment and the synoptic diagram of thrower.
Fig. 6 is the combustion pressure detecting apparatus of expression the 2nd embodiment and the synoptic diagram of thrower.
Embodiment
Below, the embodiment that present invention will be described in detail with reference to the accompanying.The combustion pressure detecting apparatus 1 that Fig. 1 representes the 1st embodiment of the present invention and the internal combustion engine that is provided with this device 1 (below be called " engine ") 2.This engine 2 for example is mounted in the in-line four cylinder direct injection ic engine on the vehicle (not shown), has cylinder head 4 and cylinder block 12.On cylinder block 12, be set side by side with 4 cylinders 3 (only illustrating 1), cylinder head 4 be installed in cylinder block 12 above, both 4,12 are engaging each other securely.Form firing chamber 6 between the piston 5 in cylinder head 4 and each cylinder 3.
And, as shown in Figure 3, on cylinder head 4, be formed with mounting hole 10 in opposite side of relative air intake opening 7 and exhausr port 8 and the position below the adjacent air intake opening 7.Thrower 9 is installed in this mounting hole 10 uses device, and combustion pressure detecting apparatus 1 is installed with this thrower 9 as burning.
And on cylinder head 4, being formed with wire harness derives groove 11 (cable derivation groove).This wire harness derive groove 11 be used for after the wire harness 25 (cable) of the sensor element 21 stated be retracted to the outside of cylinder head 4; This wire harness is derived the below that groove 11 is configured in mounting hole 10, and from sensor the direction extension of the bottom of recess 10c to Fig. 3 right-hand (promptly opposite with exhausr port 8) is installed.Mounting hole 10 extends sideling, and this wire harness is derived the circular-arc bottom surface approximate horizontal extension of groove 11.Thus, the degree of depth (apart from the height of bottom surface) that wire harness is derived groove 11 is along with uprising towards the foreign side of cylinder head 4, and is as shown in Figure 4, becomes the U font in the outside surface upper shed of cylinder head 4.The cross-directional length of wire harness derivation groove 11 bottom surfaces is shorter than the degree of depth of aforementioned consent 13a.
Combustion pressure detecting apparatus 1 by sensor element 21, be used for fixing the thrower seat 22 (sensor fixed part) of sensor element 21 and thrower plate 24 formations such as (support components) that is used to support thrower 9.Sensor element 21 forms ring-type, for example utilizes piezoelectric element to constitute, and sensor element 21 is according to the loading output detection signal that is applied to it.At the range upon range of respectively up and down packing ring 22,23 that ring-type is arranged of sensor element 21, this sensor element 21 is housed in sensor with packing ring 22,23 and installs among the recess 10c.
And sensor element 21 is connected with wire harness 25.This wire harness 25 is used to export the detection signal from sensor element 21, and derive near bottom of groove 11 through sensor as aforementioned on its approximate horizontal ground, and extends to the outside of cylinder head 4 towards the direction of a side opposite with exhausr port 8.As shown in Figure 2, be retracted to outside 4 wire harness 25 of total of cylinder head 4 from each sensor element 21, extend along mutually the same direction along the sidepiece approximate horizontal ground of cylinder head 4.4 wire harness 25 are connected with control device (not shown) through connector (not shown) by harness (in Fig. 2, being depicted as the state that has the gap each other for ease) each other.Detection signal from sensor element 21 is exported through corresponding wire harness 25, and is input to control device.
Under this installment state, thrower seat 22 is by roughly whole of its flange part 22b, and through packing ring 23 compression sensor element 21 downwards, consequent loading acts on the sensor element 21 all the time.That is, sensor element 21 is clamped between cylinder head 4 and the flange part 22b, and the constant intensity when according to screw-in thrower seat 22 being installed is set the initial loading that acts on sensor element 21.In addition, seat main body 22a extends to firing chamber 6, and its bottom is facing to firing chamber 6.In addition, according to above-mentioned size relationship, the upper surface of flange part 22b is the state that the upper end of recess 10c is installed a little less than sensor.
Thrower plate 24 is installed in plate and installs on the recess 10d.This thrower plate 24 for example utilizes the SUS material to constitute, and forms the ring-type with specific thickness.And thrower plate 24 has the external diameter that the aforementioned panels of being slightly less than is installed the diameter of recess 10d, and has the internal diameter greater than the external diameter of seat main body 22a.In the outer peripheral face of thrower plate 24 and the bight between the bottom surface, along circumferential formation chamfering, the part that is formed with chamfering like this becomes the lead division 24a that is used to draw wire harness 25 in addition.
This thrower plate 24 is installed between the circle wall of recess 10d through upper end and the plate of chimeric present main body 22a, thereby is installed on the cylinder head 4.In this state; The lower surface of thrower plate 24 is installed the end difference butt of the intersection of recess 10d and sensor installation recess 10c with plate; And covering sensor installation recess 10c, be set up in parallel on axis direction with sensor element 21, be formed on the overlapping state of axis direction.According to aforementioned dimensions relation, between the flange part 22b upper portion of thrower seat 22 and thrower plate 24, form radial play G1, between flange part 22b and thrower plate 24, form the clearance G 2 of axis direction, thereby both 22,24 are separated from each other.And the upper end that thrower plate 24 is compared in the upper end of seat main body 22a is positioned at firing chamber 6 sides.In addition, the lead division 24a of thrower plate 24 derives groove 11 from the top facing to wire harness.
The spray nozzle part 9b of thrower 9 is inserted in the thrower seat 22, and its bottom is facing to firing chamber 6.Make whole of flange part 9c with thrower plate 24 butts, and the powerful state of pushing under, through installing component 14 bolt 15 screw-in cylinder head 4, thereby thrower 9 is installed on the cylinder head 4.That is, thrower plate 24 is clamped between thrower 9 and the cylinder head 4, and thrower 9 is supported by thrower plate 24.In addition, because the diameter of spray nozzle part 9b is slightly less than the internal diameter of main body 22a, therefore between spray nozzle part 9b and seat main body 22a, be formed with minim gap G3 radially.In addition; As noted earlier, the upper end of seat main body 22a is compared thrower plate 24 and is positioned at firing chamber 6 sides, between thrower 9 and thrower seat 22 tops, is formed with the clearance G 4 of axis direction thus; Because above clearance G 3, G4, thrower 9 is mounted to the state that is separated with thrower plate 24.
Fig. 5 schematically shows above-mentioned thrower 9 and combustion pressure detecting apparatus 1.Below, use Fig. 5 that the combustion pressure detection action is described.Under the state that engine 2 stops, can not produce combustion pressure, so only based on the initial load effect of thrower seat 22 in sensor element 21.
When engine 2 entrys into service, follow air inlet, exhaust and burning etc., produce combustion pressure and periodically change.As noted earlier, thrower seat 22 is followed the change of combustion pressure, acts on pressure in the face of thrower seat 22 lower ends of firing chamber 6 and increases or reduce, and thrower seat 22 integral body produce displacement on axis direction thus.Like this, when combustion pressure increased, flange part 22b produced displacement to the opposition side of firing chamber 6, and the loading that acts on sensor element 21 thus reduces, sensor element 21 elongations.On the contrary, when combustion pressure reduced, flange part 22b produced displacement to firing chamber 6 sides, and the loading that acts on sensor element 21 thus increases, and sensor element 21 shrinks.Like this, sensor element 21 stretches according to the increase and decrease of the loading that is applied to it, thereby representes the detection signal of the variable quantity of combustion pressures through wire harness 25 outputs.According to this detection signal, calculate combustion pressure at control device.
As stated; Combustion pressure detecting apparatus 1 according to this embodiment; Thrower seat 22 be provided in and thrower 9 between have clearance G 1～G4; And cut off state from the loading of thrower 9, sensor element 21 be fixed on from the thrower seat 22 of the loading of thrower 9 through such cut-out and cylinder head 4 between.Therefore,, also can cut off the loading change that therefore causes reliably, can not feed through to sensor element 21 even the combustion pressure of thrower 9 produces change.As a result, can from detection signal, get rid of the combustion pressure variance components, the detection signal of being exported only reflects combustion pressure, so can improve the combustion pressure detection precision.
And,,, therefore can keep the combustion pressure detection precision even for example loading and unloading for maintenance, when changing thrower 9, also can keep the initial loading of sensor element 21 owing to be cut off from the loading transmission of thrower 9.And, be that the mounting hole 10 of thrower 9 is provided with because combustion pressure detecting apparatus 1 utilizes existing structure, so change structure, the layout of engine 2 hardly, can form cramped construction on the whole.Particularly sensor element 21 is located on the axis direction with thrower plate 24 side by side, can make the compact dimensionsization with the direction of the axis quadrature of mounting hole 10 thus.
In addition; Because thrower plate 24 is clamped between thrower 9 and the cylinder head 4; Between thrower plate 24 and thrower 9, do not have other component parts, thus can guarantee both 24, the bigger contact area between 9, can thrower 9 be installed on the cylinder head 4 with stable status.
And, derive the degree of depth that is shorter in length than consent 13a of groove 11 to wire harness 25 guiding cylinder head 4 outside wire harness, so compare along the situation that its length direction extends in consent 23a with such wire harness 25 that makes in the past, the size of wire harness 25 can be shorter.The operability of the wire harness 25 in the time of thus, can improving assembling and service engine 2 etc.In addition because mounting hole 10 is configured in apart from exhausr port 8 position far away, and wire harness 25 from this mounting hole 10 to extending, so the heat affecting of exhaust is difficult to feed through to wire harness 25 with exhausr port 8 opposite directions.As a result, wire harness 25 is difficult for being exposed under the high temperature, therefore can prolong its life-span.
In addition, the wire harness 25 of sensor element 21 is derived the outside that groove 11 extends to cylinder head 4 through the wire harness that is formed at cylinder head 4, and wire harness derive groove 11 from mounting hole 10 to extending with exhausr port 8 opposite directions, and be opened on the outside surface of cylinder head 4.Thus, can be with wire harness 25 direction opposite that derive through wire harness that groove 11 stably lead with exhausr port 8, and the offset etc. that can not produce wire harness 25.Therefore, can wire harness 25 stably be remained under the state that does not subject to heat affecting.
And, derive groove 11 by the wire harness that is formed at each cylinder 3, extract 4 wire harness 25 out in the same side of the outside of cylinder head 4, thereby carry out easily they are tied together processing.
And; Because the lead division 24a that can form by the part in the face of wire harness derivation groove 11 at thrower plate 24 draws wire harness 25; Even so for example under the situation of wire harness 25 near thrower plate 24 configuration, wire harness 25 also is difficult for contacting with thrower plate 24 or rubbing.And, even contact, owing to be formed with R and have curve form, so that wire harness 25 is difficult for is impaired at lead division 24a.Therefore, the arrangement freedom of wire harness 25 can be improved, and the life-span of wire harness 25 can be prolonged.
In addition, wire harness is derived groove 11 and is extended from the bottom that sensor is installed recess 10c, and is configured in apart from air intake opening 7 position far away, thus can easily handle wire harness 25, and can not receive the obstruction of air intake opening 7.And, owing to derive the above-mentioned configuration of groove 11 according to wire harness, can guarantee and exhausr port 8 between greater distance, therefore can further suppress influence from the heat of exhausr port 8.
In addition because that wire harness is derived the length of groove 11 is shorter, therefore can be from the outside easily Visual Confirmation be positioned at the state of its inner wire harness 25, so can improve the maintainability of combustion pressure detecting apparatus 1.
Fig. 6 schematically shows the combustion pressure detecting apparatus of the 2nd embodiment of the present invention.This pick-up unit 30 has the structure approximate with the combustion pressure detecting apparatus of the 1st embodiment 1, below gives same-sign to identical inscape, stresses the difference with the 1st embodiment.
In the thrower seat 22 of the 1st embodiment; Flange part 22b is located at the position of the predetermined distance apart from the upper end; And in the thrower seat 31 (sensor fixed part) of this embodiment; Flange part 31b is located at the upper end of thrower seat main body 31a, and clamping has sensor element 21 between thrower seat and cylinder head 4.
And the thrower plate 32 (support component) of the 2nd embodiment also forms ring-type, and its external diameter and the 1st embodiment are roughly the same, and on the other hand, internal diameter is then bigger.Through such change, the inner space of thrower plate 32 enlarges, and sensor element 21 is housed in this space.That is, thrower plate 32 is configured to surround sensor element 21, and and sensor element 21 between be formed with radial play G5.And; The axis direction thickness of thrower plate 32 is configured to the value greater than the axis direction thickness sum of sensor element 21 and flange part 31b; Between thrower 9 and thrower seat 31, be formed with the clearance G 6 of axis direction thus, both 9,31 are separated from each other out.Therefore, in this combustion pressure detecting apparatus 30, the change of combustion pressure only passes to sensor element 21 through thrower seat 31.
According to above-mentioned combustion pressure detecting apparatus 30; Identical with the combustion pressure detecting apparatus 1 of the 1st embodiment; Cut off with G6 by clearance G 5 to the loading transmission of sensor element 21 from thrower 9; So can not receive the influence of the combustion pressure change of thrower 9, can improve the combustion pressure detection precision.And,, therefore can make combustion pressure detecting apparatus 30 form the structure of compact on the whole because sensor element 21 is housed in the inside of thrower plate 32.
In addition, the present invention is not limited to illustrated above-mentioned embodiment, and can implement in every way.For example; In the 1st and the 2nd above-mentioned embodiment, utilize thrower plate 24,32 to support thrower 9 respectively, but be not limited to this thrower method for supporting; As long as can cut off from the loading transmission of thrower to the thrower seat; And can support thrower with stable status, also can the injector plate, and adopt other proper device.
And, in the 1st embodiment, in the integral circumferential formation chamfering of thrower plate 24, thus the lead division 24a of formation wire harness 25, but be not limited to this, for example also can only form chamfering in the part that derives groove 11 in the face of wire harness.And, also can not form chamfering, and form for example groove or otch.In addition; The example that thrower 9 and combustion pressure detecting apparatus 1 are set simultaneously has been described in the embodiment; But be not limited to this combination, for example, also can spark plug be become the state adjacent with air intake opening 7 as burning with cell configuration; And spark plug and combustion pressure detecting apparatus 1 are set simultaneously, to replace thrower 9.
And, the example that is applied to the present invention in in-line four cylinder engine 2 has been described in the embodiment, but has been not limited thereto, the engine that also goes for single cylinder or have the other types of a plurality of cylinders.In addition, the invention is not restricted to be installed in the engine on the vehicle, certainly be applicable to comprise that bent axle is configured in the various industrial internal combustion engine of the marine propellers such as outboard motor of vertical direction with engine.In addition, can be in the scope of aim of the present invention the structure of the concrete part of appropriate change.
Claims (2)
1. combustion pressure detecting apparatus; It is located on the cylinder head with device with burning; And detect as the pressure in the said firing chamber of combustion pressure; It is a thrower and a side who is used for the spark plug of the indoor air fuel mixture of ignition combustion that is used for burner oil that device is used in this burning, and said cylinder head has the air intake opening and the exhausr port of difference opening on a side and another side
On said cylinder head; In a said relatively air intake opening side opposite and at the lower position of said air intake opening with said exhausr port; Be formed with the side that is used for installing said thrower and said spark plug, connect said cylinder head and have the mounting hole that sensor is installed recess sideling
Said combustion pressure detecting apparatus has: sensor element, and it is located at this sensor and installs in the recess, is used to detect the pressure in the said firing chamber;
Cable, it is connected with this sensor element, and the edge direction opposite with said exhausr port extended, and exports the detection signal from said sensor element,
On said cylinder head, be formed with cable derivation groove in the outside surface upper shed of said cylinder head; This cable is derived groove and is extended to the direction opposite with said exhausr port from said mounting hole; The approximate horizontal ground, circular-arc bottom surface that this cable is derived groove extends, and said cable is derived the outside that groove extends to said cylinder head through said cable.
2. combustion pressure detecting apparatus according to claim 1; It is characterized in that; In said mounting hole, be provided with and be used to support the support component of said burning, be formed with the lead division that is used for outgoing cable in the part that derives groove in the face of said cable of this support component with device.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004-229878 | 2004-08-05 | ||
| JP2004229878 | 2004-08-05 | ||
| JP2004229878A JP4166736B2 (en) | 2004-08-05 | 2004-08-05 | Combustion pressure detector |
| JP2004-314553 | 2004-10-28 | ||
| JP2004314553A JP4243239B2 (en) | 2004-10-28 | 2004-10-28 | Combustion pressure detector |
| JP2004314553 | 2004-10-28 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100899278A Division CN100523762C (en) | 2004-08-05 | 2005-08-04 | Combustion pressure detecting apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101435731A CN101435731A (en) | 2009-05-20 |
| CN101435731B true CN101435731B (en) | 2012-10-10 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100899278A Expired - Fee Related CN100523762C (en) | 2004-08-05 | 2005-08-04 | Combustion pressure detecting apparatus |
| CN2008101816596A Expired - Fee Related CN101435731B (en) | 2004-08-05 | 2005-08-04 | Combustion pressure detecting apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100899278A Expired - Fee Related CN100523762C (en) | 2004-08-05 | 2005-08-04 | Combustion pressure detecting apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4166736B2 (en) |
| CN (2) | CN100523762C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100767525B1 (en) | 2006-11-20 | 2007-10-17 | 현대자동차주식회사 | Structure for preventing ice formation of injector for automotive lpi |
| DE102008002654A1 (en) * | 2008-06-26 | 2009-12-31 | Robert Bosch Gmbh | Decoupling element for a fuel injection device |
| KR101187848B1 (en) * | 2010-06-16 | 2012-10-04 | 한양대학교 에리카산학협력단 | Hollow injector unit and Engine having the same |
| CN103380357B (en) * | 2011-02-25 | 2016-03-02 | 本田技研工业株式会社 | The cylinder pressure pick-up unit of fuel-direct-jetting type internal combustion engine |
| CN103196614A (en) * | 2013-03-18 | 2013-07-10 | 中国兵器工业集团第七0研究所 | Airway pressure measuring system |
| JP6705056B2 (en) * | 2017-03-27 | 2020-06-03 | 本田技研工業株式会社 | Internal combustion engine for saddle type vehicles |
| EP3564642A1 (en) * | 2018-05-02 | 2019-11-06 | Winterthur Gas & Diesel AG | Device for determining the pressure in a combustion engine of a large engine and large engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4898024A (en) * | 1987-05-22 | 1990-02-06 | Nissan Motor Co., Ltd. | Piezoelectric pressure measuring instrument |
| US4996873A (en) * | 1987-10-19 | 1991-03-05 | Nissan Motor Company, Limited | Washer-type pressure sensor |
| US5313849A (en) * | 1991-04-25 | 1994-05-24 | Ngk Spark Plug Co., Ltd. | Device for temporarily holding pressure sensor in place within spark plug attaching hole of cylinder head |
| US5329809A (en) * | 1993-04-22 | 1994-07-19 | General Motors Corporation | Non-intrusive cylinder pressure sensor |
| US5479817A (en) * | 1992-07-28 | 1996-01-02 | Ngk Spark Plug Co., Ltd. | Spark plug with built-in pressure sensor |
-
2004
- 2004-08-05 JP JP2004229878A patent/JP4166736B2/en not_active Expired - Fee Related
-
2005
- 2005-08-04 CN CNB2005100899278A patent/CN100523762C/en not_active Expired - Fee Related
- 2005-08-04 CN CN2008101816596A patent/CN101435731B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4898024A (en) * | 1987-05-22 | 1990-02-06 | Nissan Motor Co., Ltd. | Piezoelectric pressure measuring instrument |
| US4996873A (en) * | 1987-10-19 | 1991-03-05 | Nissan Motor Company, Limited | Washer-type pressure sensor |
| US5313849A (en) * | 1991-04-25 | 1994-05-24 | Ngk Spark Plug Co., Ltd. | Device for temporarily holding pressure sensor in place within spark plug attaching hole of cylinder head |
| US5479817A (en) * | 1992-07-28 | 1996-01-02 | Ngk Spark Plug Co., Ltd. | Spark plug with built-in pressure sensor |
| US5329809A (en) * | 1993-04-22 | 1994-07-19 | General Motors Corporation | Non-intrusive cylinder pressure sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4166736B2 (en) | 2008-10-15 |
| CN100523762C (en) | 2009-08-05 |
| JP2006046224A (en) | 2006-02-16 |
| CN101435731A (en) | 2009-05-20 |
| CN1731116A (en) | 2006-02-08 |
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