JPS59201934A - Removing device of adhesive substance of ignition timing sensor - Google Patents

Abstract

PURPOSE:To remove adhesive substance of a light inlet part properly by keeping a heater provided at the light inlet side end part of an ignition timing sensor at a fixed temperature for burning the adhesive substance of the light inlet part. CONSTITUTION:An ignition timing sensor 1 is connected with a connector 8 for an optical fiber in a same axle with a light outlet side end part of a sensor main body 2 via a media member 14. An optical fiber 18 is inserted in a narrow hole 16 formed along a center axle line of each member 2, 1, 4 and 8. A heater line 20 is wound in a coil form around the periphery of the optical fiber 18 at a light inlet side end part of a sensor main body 2 and both ends of the heater line 20 are connected with a heater control device 24 via a lead cable 22. The heater line 20 is kept at 600-700 deg.C by a heater control device 24 for burning to remove the adhesive substance on the light inlet side end part of the sensor main body 2 without deteriorating the sensor main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for removing deposits from an ignition timing sensor that detects Iυj using a source fiber.

The ignition timing sensor propagates the combustion light in the engine combustion chamber to the outside of the engine, but as time passes, carbon etc. adhere to the CF' If there is a delay, 1 or 1:.

An object of the present invention is to provide a kimono removal device for a Wrf hole timing sensor that can appropriately remove kimono when light enters the sensor.

In order to achieve this object, according to the I/J young object removing device of the present invention, a heater is provided at the end 3 on the inlet G side of the sensor, and this heater is maintained at 600 to 700°C. Burn off and remove the deposits on the light entrance area.

At temperatures higher than 600°C, it is difficult to burn off the deposits, and at temperatures higher than 700°C, the ignition timing sensor may deteriorate. According to the present invention, it is possible to efficiently remove the IxJ obstruction without causing problems such as deterioration of the j:f hole timing sensor.

Preferably, the holding means energizes the heater when the temperature of the heater becomes lower than 600'C, and de-energizes the heater when the temperature of the heater becomes higher than 700'C.

The heater for removing deposits can also serve as a heater for claws, thereby making it possible to omit the glow plaque.

As a claw heater, the temperature may reach approximately 900'C, but since it is for an extremely short period of several seconds, there is no problem of deterioration of the ignition timing sensor.

01 The burning of the kimono is carried out after a predetermined period of time has elapsed from the end of the glow use. Therefore, each time the engine is operated, the burnout is performed at l&%('J kimono for an appropriate period of time, and the glow period is avoided and the storage battery G voltage is sufficiently recovered.)

An actual Mm example of the present invention will be described with reference to Figure +fii.

In the ignition timing sensor 1 shown in Fig. 1, the main body 2 has a hexagonal part 4 on its outer circumferential surface that engages with a tool such as a spanner, and a threaded groove 6 for being fitted into the cylinder head. The optical fiber connector 8 has a screw 10 for being screwed into a corresponding connector, and a hexagon F; It is coaxially connected to the light emitting side end of the main body 2 via the OJ'14. Pore 1 (i is sensor main body 2, interposed part 11' 14,
and is formed along the central axis of the connector 8, through which the optical fiber 18 is passed. The heater wire 20 is wound in a coil shape around the outer periphery of the optical fiber 8 at its end, and connected to the heater control device 2 via conductive wires 22 at both ends.
Connected to 4.

FIG. 2 shows the state in which the ignition timing sensor 1 is installed, and the cylinder head 26 is formed with an auxiliary chamber 28, a hole 30 for a fuel injection nozzle, and a hole 32 for the ignition timing sensor 1. The ignition timing sensor 1 is press-fitted into the hole '32, and its lower end protrudes into the auxiliary chamber 28. A spherical lens 34 is attached to the light incident end of the ignition timing sensor 1, and the position of the lower end of the ignition timing sensor 1 is set so that the 11 (i) from the fuel injection nozzle hits the lens 34. Ru1,
Since the lens ``14'' is cleaned by the 11ζ1 gun 36, adhesion of foreign matter to the lens 34 is prevented.

FIG. 3 is a circuit diagram of the heater control device. The heater wires 20 of each cylinder are connected in parallel to each other. , main relay:
38 and the sub-line electric appliance 40 are connected to each other in parallel with each other.
44, resistors 45 are connected to the contact 44 in a plane row. The contacts 42 and 44 are connected to the high voltage bend 46 at one end and to the heater &! connected in parallel through a resistor (sensing resistor) 48 at the other end. 20. The temperature of the heater wire 20 can be detected from the voltage drop across the resistor 48, and the voltage ratio across the resistor 48 is sent to four electronic control units via terminals A and I3. In addition, the heater wire 20 beam [''
- doubles as a heater.

FIG. 4 is a schematic diagram of the electronic control device 4 (+).

The voltage between the terminals 13 and 13 is sent to a multiplexer 52 via a differential amplifier a 50. Multiplexer 52 is Δ/D
(Analog/Digital) An input is selected from the exchange box 54 based on a control signal and sent to the A/D converter 54. A/D
In the converter 54, the A/l) q converted data is converted to CP.
The CI" U56 controls the raw silk appliance 38 and the auxiliary appliance 40. Figure 5 shows the flowchart of the heater control routine. A large current is passed through the main relay 38 to the heater wire 20, and then the engine cooling water f!ii:
A small current is passed through the heater wire 2o through the auxiliary wire 4o and the resistor r(5) for a time F(Tw) related to 艮1゛w, causing a glow and being worn out. ]
- At the time when the energization for the ignition timing sensor 1 has already ended and 10 minutes have passed since the start of the glow, the heater wire 20 is energized for only 13 minutes to burn off the deposits on the incident light F and flll of the ignition timing sensor 1. ] A stream for grilling vegetables is passed through a sub-line electric device 40 and a resistor 45. In this way, the burning off of the deposits is carried out so as not to overlap with the black period and during the period when the voltage of the charge storage circuit has sufficiently recovered. During these three minutes, the temperature of the heater wire 20 is 600.
When the temperature becomes lower than 700°C, the heater wire 2 () starts to be energized, and when the temperature of the heater wire 2071iH becomes higher than 700°C, the heater &! 2r is de-energized. The reason why the temperature of the heater wire 2 is maintained at 600 to 700°C is that if the temperature of the heater wire 20 is lower than 600°C, the attached material on the lens 34 as the light entrance part of the sensor 1 cannot be burned off. This is because if the temperature of the heater wire 20 becomes higher than 700° C., there is a risk that the sensor I will deteriorate. In step 60, it is determined whether a starting signal has been generated or not, and only if the determination is positive, the process proceeds to the following steps. In step 62, the flag Fs is set to zero. In step 04, the main relay 38
Turn on only.

As a result, a large current is supplied to the heater wire 20 via the contact 42. In step 66, it is determined whether 3 seconds have elapsed since the main relay 38 was turned on, and when 3 seconds have elapsed, the process proceeds to step 68. In step 68, the main relay 38 is turned off and the auxiliary relay 40 is turned on. As a result, the heater wire 20
through relay 40 and resistor 45, the heater current decreases. In step 70, the I relay 40
Compare l(!j If-ifTs and F (Tw ) since 'I's >F' (i
'Y), the process advances to step 72. Ta/ToshiF (1
'w) is a decreasing function of the engine cooling water temperature Tw, and in step 72, 10
345 minutes have elapsed D) Determine whether it is anzu, and the determination is city.
If so, proceed to step 771. Step 7/l is 7.
Turn off the relay/J Z438, turn on the sub line electric wire Wa40, and set the flag Fr to 1-. In step 70, the voltage drop vg at the resistor (sensing register) 48 is compared with a predetermined value v1, and if Vg>Vl, the process returns to step 74, and if g≦v1, the process proceeds to step 78. The voltage drop Vg across resistor 48 is related to the temperature of heater wire 20; i+! As the temperature rises, Vg decreases, and vl corresponds to 600°C of the heater wire 20, and if the heater wire 20 is wetter than 60+1"C, Vg>Vl. In step 78, Vg is set to a predetermined value. Compare with the value v2, and if Vg < Vg, step 80
If v2≧vg, the process advances to step 82. In step 80, the main relay 38 and the secondary t? '4 ”l+
440 are both turned off. As a result, the current supply to the heater wire 20 is increased. In step 82, it is determined whether the red light has passed for 3 minutes after the flag Fr is set, and if the determination is positive, this block diagram ends, and if not, the process returns to step 76. Corresponding to C, if the heater wire 20 is at a temperature higher than 700°C, Vg>
It becomes vg. 1

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of the ignition timing sensor, Fig. 2 is a diagram showing the installation state of the ignition timing sensor, Fig. 3 is a circuit diagram of the heater control device, Fig. 4 is a block diagram of the electronic control device, and Fig. 4 is a block diagram of the electronic control device. FIG. 5 shows feature 1 of the heater control routine. 1... Ignition timing sensor, 18... Original fiber, 20
... Heater wire, 24 ... Heater control device, 28 ...
- Sub-chamber: 34...Lens. Special Training Applicant 1 - Yota Autotun Co., Ltd. Representative B 14 Patent Attorneys 7 Osamu Naka Taira Figure 2

Claims (1)

[Claims] 1. In an ignition timing sensor that detects the ignition timing of an air-fuel mixture by propagating combustion light in an engine combustion chamber to the outside of the engine via an optical fiber, a What kind of ignition timing sensor is it characterized in that it is equipped with a heater provided therein and a holding means that holds the heater in the range of 600 to 700''C during one cycle of burning off the deposits on the light incident part of the sensor? 9 substance removal device. 2 The holding means turns on the heater when the temperature becomes lower than 600°C, and turns off the heater when the temperature becomes lower than 70°C (1°C). A deposit removing device according to claim 1. 3. A kimono removing device according to claim 1, characterized in that the heater also serves as a claw heater. 4 Claims 1(d) and 1(d)(jf17) are characterized in that burning off the deposits is carried out after a predetermined period of time has elapsed from the end of the 111 electric charge.