CN1325889C - Oil collector - Google Patents

Abstract

The invention relates to an oil collector. The oil collector is provided with an injector interface, and an oil injection sensor is installed on the oil collector. The oil collector equipped with the fuel injection sensor of the present invention is used on the fuel injection pump test bench, can determine whether each oil cylinder is injected, and can measure the moment (or phase) of each oil cylinder's oil injection to calculate the dynamic oil injection phase angle; It only needs to judge whether there is oil injected into the oil collector, regardless of the amount of injected oil, so the requirement for the linearity of the sensor is not high. The structure of the present invention is simple, the processing circuit is simple, and the manufacturing cost is greatly reduced; the oil injection sensor The structure is novel, small in size, compact in structure, and has a sufficiently high response frequency. The signal output by the fuel injection sensor is a switch signal, which is used to indicate the two states of fuel injection or non-fuel injection, so it has strong anti-interference ability and reliable operation.

Description

oil collector

technical field

The invention relates to an oil collector which can judge whether there is oil sprayed in according to the oil pressure fluctuation range in the container.

Background technique

The oil pressure in the oil collector is measured using a specially designed pressure sensor. At present, the common pressure sensors on the market have various forms such as piezoelectric sensors and piezoresistive sensors. Due to the consideration of measurement accuracy, the structure is relatively complicated, and corresponding amplification or conditioning circuits must be configured and passed through A/D. After the conversion, it can be transmitted to the microcomputer for processing. If these sensors are directly used as the test signal source on the fuel injection pump test bench, it will not only have a complex structure, a large volume, but also a high cost, which is not conducive to popularization and application.

Contents of the invention

In view of the above problems, the object of the present invention is to provide an oil collector, which can be used on the fuel injection pump test bench to determine whether there is oil injection according to the fluctuation range of the oil pressure.

In order to achieve the above object, the technical solution of the present invention is to adopt an oil collector, which is provided with a fuel injector interface, and a fuel injection sensor is also installed on the oil collector, wherein the fuel injection sensor is piezoelectric Fuel injection sensor, the piezoelectric fuel injection sensor is an induction column made of insulating material. The induction column is inserted into the socket at the bottom of the oil collector. A sealing ring is installed between the induction column and the socket. The bottom of the induction column The upper conductive sheet, the piezoelectric crystal, and the lower conductive sheet are installed in sequence, and the above-mentioned components are packaged in the sensor casing, and the upper and lower conductive sheets are drawn out from the gap of the casing through wires.

The oil collector equipped with the fuel injection sensor of the present invention is used on the fuel injection pump test bench, can determine whether each oil cylinder is injected, and can measure the moment (or phase) of each oil cylinder's oil injection to calculate the dynamic oil injection phase angle; It only needs to judge whether there is oil injected into the oil collector, regardless of the amount of injected oil, so the requirement for the linearity of the sensor is not high. The structure of the present invention is simple, the processing circuit is simple, and the manufacturing cost is greatly reduced; the oil injection sensor The structure is novel, small in size, compact in structure, and has a sufficiently high response frequency. The signal output by the fuel injection sensor is a switch signal, which is used to indicate the two states of fuel injection or non-fuel injection, so it has strong anti-interference ability and reliable operation. The oil collector of the present invention can be used on the fuel injection pump test bench, not only can be used to determine whether the fuel injection pump stops fuel injection at high speed, but also can measure the timing (or phase) of fuel injection of each cylinder to calculate the dynamic fuel injection phase angle.

Description of drawings

Figure 1 is a structural diagram of an oil collector with an injection sensor;

Figure 2 is a schematic diagram of the fuel injection indicator circuit.

Detailed ways

As shown in Figure 1, a fuel injection sensor is installed on the fuel collector 1 of the present invention, wherein the fuel injection sensor is a piezoelectric fuel injection sensor, and the piezoelectric fuel injection sensor includes an induction column 2 made of an insulating material, The induction column 2 is inserted into the socket provided at the bottom of the oil collector. A sealing ring 3 is installed between the induction column 2 and the socket. Sheet 7 and pressure plate 8, the above-mentioned components are packaged in the sensor housing 4, the upper conductive sheet 5 is in contact with the pressure plate 8 through high-impedance insulated wires, and the lower conductive sheet 7 is in contact with the pressure plate 8, and the wires are connected from the gap 9 on the metal sensor housing 4 respectively. lead out. When the injector injects oil, the oil pressure in the oil collector 1 rises, and the induction column 2 transmits this pressure to the piezoelectric crystal 6, and the charges with opposite signs are generated on the two ends of the piezoelectric crystal 6 due to the piezoelectric effect, and enter The more fuel injected in the oil collector, the greater the range of pressure rise, the more charges generated at both ends of the piezoelectric crystal 6, and the higher the range of output voltage rise of the fuel injection sensor; the fuel injector does not inject fuel Or when the amount of oil injected into the oil collector is very small, the oil pressure in the container is low and the pressure rises slightly, and the output voltage of the fuel injection sensor basically remains unchanged or rises very little.

In Fig. 2, one end of fuel injection sensor CRY is grounded, and the output signal of the other end is attenuated by resistor 201, filtered by resistor 202 and capacitor C201, and then connected to the positive input terminal 3′ of comparator U201, and the reverse input terminal 2′. Adjustable resistor P201, by adjusting P201 to set the comparison voltage of point 2', the output terminal 6' of U201 is connected with the switching transistor N201 through the current limiting resistor R204, and the deep negative feedback is generated by the resistor R203, and N201 is connected through the pull-up resistor R205 and LED L02 are powered by +12V power supply. The more charges generated at both ends of CRY, the higher the voltage at point 3', if it is higher than the comparison voltage at point 2', the output terminal 6' of U201 is at high level, so N201 is turned on, and L02 is turned on to emit light , the collector is at low level; when the amount of charge generated at both ends of CRY is small, the voltage at point 3' is low, and the output terminal 6' of U201 is low because it is lower than the comparison voltage at point 2' Ping, N201 is off, so L02 is also off and does not emit light, and the collector outputs a high level.

Claims (1)

1, a kind of oil intercepter, oil intercepter is provided with the fuel injector interface, it is characterized in that: the oil spout sensor also is installed on oil intercepter, wherein, the oil spout sensor is a piezoelectric type oil spout sensor, piezoelectric type oil spout sensor comprises the induction post of being made by insulating material, the induction post coincide and inserts in the jack of oil intercepter bottom setting, between induction post and the jack O-ring seal is installed, the bottom of induction post is equipped with conducting strip successively, piezoelectric crystal, following conducting strip and pressing plate, above-mentioned each parts are encapsulated in the sensor housing, on, following conducting strip is drawn by the breach of housing by lead.