JP2017082614A - Oil pump oil passage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil pump oil passage system having a temperature sensitive relief valve and capable of preventing wrong determination due to a secular change of a temperature sensitive member.SOLUTION: An oil pump oil passage system includes: a computing unit G; a temperature sensitive relief valve B that is driven based on a level of an oil temperature and in which an opening area of a relief outflow portion is increased/decreased by a temperature sensitive member; an engine speed indicator C; an oil temperature detection section D; and an oil pressure detection section F, and performs oil pressure determination processing. The oil pump oil passage system performs: first oil pressure determination value determination processing (stp 7) for correcting reduction amount of deformation amount of the temperature sensitive member relative to the oil pressure caused by a secular change and outputting a first oil pressure determination value by using the computing unit G; and the oil pressure determination processing (stp 8) for determining the failure of the temperature sensitive relief valve B when the oil pressure detection section F detects oil pressure lower than the first oil pressure determination value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil pump oil passage system using a temperature-sensitive variable oil pump for a vehicle.

  An oil passage for supplying oil for lubrication and cooling to the engine needs to maintain a predetermined range of oil pressure. For this reason, a relief path is provided from the downstream to the upstream of the oil pump that supplies hydraulic pressure, and the amount of inflow into the relief path is controlled by a relief valve. However, when a problem occurs in the relief valve, various problems occur in driving a vehicle such as an automobile.

  For example, if the relief valve stops moving in the open state, a large amount of oil always bypasses the relief path, resulting in a constant shortage of hydraulic pressure. In particular, when the engine is rotating at a high rotation speed at a high oil temperature, the hydraulic pressure shortage becomes remarkable, and so-called seizure occurs and the engine itself may be damaged.

  In addition, if the relief valve stops moving, the oil circulates more than necessary in the oil passage, so that the fuel efficiency deteriorates. Therefore, it is necessary to constantly monitor the state of equipment around the oil passage.

  Patent Document 1 has a pressure stage switching mechanism and a hydraulic pressure sensor for switching the hydraulic pressure between a high pressure stage and a low pressure stage, and after issuing a command to switch between high and low by a command from an engine control unit (ECU), the pressure in the oil passage is There is described a hydraulic control device for an internal combustion engine which is measured by a hydraulic sensor and which is determined to be abnormal when a predetermined pressure is not reached.

  Patent Document 2 describes an engine oil pressure determination device that determines a decrease in oil pressure using a hydraulic switch. A hydraulic switch is less expensive than a hydraulic sensor, but can only determine whether it is greater or less than a predetermined oil pressure. On the other hand, the engine speed at which the oil pressure constantly exceeds the predetermined oil pressure differs depending on the oil temperature. Therefore, the engine speed for checking the oil pressure is determined for each oil temperature, and the determination is made only when the engine speed corresponding to the current oil temperature is reached.

  Patent Document 3 and Patent Document 4 describe a relief valve structure with a thermowax for a fluid passage that uses a shape change or volume change depending on the temperature of a shape memory alloy or thermowax to control the relief amount according to the oil temperature. Has been.

JP 2010-116890 A JP2012-241612A Japanese Utility Model Publication No. 62-191974 JP-A-8-93430

  The hydraulic control device for an internal combustion engine described in Patent Document 1 is a device based on a hydraulic control mechanism that switches hydraulic pressure between a high pressure stage and a low pressure stage. Therefore, there is a problem that the abnormality determination mechanism described in the document cannot be applied to a mechanism that continuously controls the hydraulic pressure from a low engine speed to a high engine speed.

  The engine oil pressure determination device described in Patent Document 2 has a problem that an abnormality determination cannot be made unless the engine speed corresponding to the current oil temperature is reached.

  In patent document 3 and patent document 4, the relief control according to oil temperature is highly accurate by applying temperature sensitive members, such as a thermo element, to valve control. On the other hand, since the temperature-sensitive member changes in its temperature-sensitive characteristics over time, the abnormality determination of the hydraulic pressure has a problem of making an erroneous determination regarding abnormality taking this aging change into consideration. It was.

  Therefore, an object of the present invention, that is, a technical problem to be solved, is that an oil pump oil passage system configured to connect a hydraulic relief valve and a temperature-sensitive relief valve in parallel to cope with a change in oil temperature. An object of the present invention is to provide an oil pump oil passage system that prevents erroneous determination due to aging of a temperature member.

  In view of this, the invention according to claim 1 is used to increase or decrease the opening area of the relief outflow portion with a thermoelement, a shape memory alloy, or a temperature sensitive member that is driven by the oil temperature and the temperature of the oil pressure valve and the oil temperature. It is equipped with a temperature-sensitive relief valve, an engine tachometer, an oil temperature detection unit, and a hydraulic pressure detection unit that detects the hydraulic pressure at a predetermined engine speed, and malfunctions when the pressure falls outside the normal hydraulic range. In the oil pump oil passage system that performs a hydraulic pressure determination process for determining the first hydraulic pressure determination value, the arithmetic unit corrects a decrease in the deformation amount with respect to the oil temperature due to the secular change of the temperature sensing member and outputs a first hydraulic pressure determination value. It is determined that the temperature-sensitive relief valve has failed when the hydraulic pressure determination value is determined and the hydraulic pressure detection unit detects a hydraulic pressure lower than the first hydraulic pressure determination value. By adoption of an oil pump oil passage system for the hydraulic judgment processing, characterized in Rukoto, the above-mentioned problems are eliminated.

  According to a second aspect of the present invention, in the oil pump oil passage system according to the first aspect of the present invention, a predetermined upper hydraulic pressure value is set as a second hydraulic pressure determination value by the computing unit, and the second hydraulic pressure is detected by the hydraulic pressure detection unit. When the oil pressure higher than the determination value is detected, it is determined that the temperature-sensitive relief valve has failed. Settled.

  The oil pump according to claim 1 or 2, wherein the oil pressure detection unit is replaced by a hydraulic pressure detection device mounted on an engine accessory. By using an oil passage system, the above problems were solved.

  According to a fourth aspect of the present invention, in the oil pump oil passage system according to any one of the first, second, and third aspects, the oil pressure detection unit is a hydraulic pressure sensor. By using a road system, the above problems were solved.

  According to a fifth aspect of the present invention, in the oil pump oil passage system according to any one of the first, second, and third aspects, the oil pressure detecting unit is a hydraulic switch, and the oil pump oil is characterized in that By using a road system, the above problems were solved.

  The invention according to claim 6 is driven by a calculator, a hydraulic relief valve, and the oil temperature, and a feeling of increasing or decreasing the opening area of the relief outflow portion with a thermosensitive element made of a thermo element, shape memory alloy, or bimetal. In an oil pump oil passage system that includes a temperature relief valve, an engine tachometer, and an oil temperature detection unit, and performs a hydraulic pressure determination process that determines a failure when the hydraulic pressure range deviates to a low pressure side or a high pressure side from a normal range. The calculator performs a first oil pressure determination value determination process of correcting a decrease in the deformation amount with respect to the oil temperature due to the secular change of the temperature sensitive member and outputting a first oil pressure determination value, and a predetermined oil pressure upper limit value. Is the second hydraulic pressure determination value, the hydraulic pressure at a predetermined engine speed is estimated from the output parameter of the engine or engine accessory, and the estimated hydraulic pressure is the first hydraulic pressure determination value. If the oil pump oil passage system performs the hydraulic pressure determination process, the temperature-sensitive relief valve is determined to be defective when the pressure is lower than or lower than the second hydraulic pressure determination value. The above problem has been solved.

  According to a seventh aspect of the invention, in the oil pump oil passage system according to any one of the first, second, third, fourth, fifth, or sixth aspects, An oil pump oil passage system for performing the oil pressure determination process, wherein a failure determination of the temperature-sensitive relief valve is made based on the first oil pressure determination value during a period when the oil temperature detection unit shows a high oil temperature. As a result, the above problems were solved.

  According to an eighth aspect of the present invention, in the oil pump oil passage system according to the second or sixth aspect, the arithmetic unit calculates the second hydraulic pressure determination value during a period when the oil temperature detection unit indicates a low oil temperature. Based on the above, the oil pump oil passage system that performs the oil pressure determination process is characterized in that a failure determination of the temperature-sensitive relief valve is performed, thereby solving the above-described problem.

  In the invention of claim 1, claim 2 and claim 4, it is possible to configure an oil pump oil passage system including a failure determination device that reduces malfunctions due to characteristic changes due to aging of the temperature sensitive member. There is.

  According to the invention of claim 3, there is an effect that a hydraulic pressure detection unit dedicated to failure determination becomes unnecessary. Along with this, there are effects such as cost reduction, space saving, and reduction in failure rate by reducing the number of hydraulic pressure detection units.

  In the invention of claim 4, by using a hydraulic pressure sensor as the hydraulic pressure detecting means, an actual hydraulic pressure value can be detected in real time regardless of the engine speed. Therefore, there is an effect that normality / failure can always be determined accurately. In the invention of claim 5, there is an effect that an inexpensive hydraulic switch can be applied to the hydraulic pressure determination.

  In the invention of claim 6, since it is not necessary to arrange a special oil pressure detecting means for measuring the oil pressure, there is an effect that cost reduction, space saving, and failure rate can be reduced by reducing the number of sensors. . In the invention of claim 7, there is an effect of preventing erroneous determination at low oil temperature. In the invention of claim 8, there is an effect of preventing erroneous determination at the time of high oil temperature.

These are the flowcharts which show the example of the failure determination of 1st Embodiment which concerns on the oil-pump oil path system of this invention. These are the flowcharts which show the example of the failure determination of 2nd Embodiment which concerns on the oil-pump oil path system of this invention. (A) is an oil temperature T ° C. in the oil pump oil passage system of the present invention, and is a graph plotting the upper limit value and lower limit value of oil pressure from low to high engine speed. It is a figure which shows the example of the engine speed-hydraulic characteristic curve in temperature T degreeC. These are figures which show the structure of the oil-pump oil path system of this invention. These are figures which show the detail of a 1st hydraulic pressure judgment value determination process. (A) is a figure which shows the example of the oil pump and relief valve which comprise the oil pump oil path system of this invention, (B) is sectional drawing of the relief valve area | region (alpha).

  The oil pump oil passage system of the present invention automatically adjusts the relief valve according to the oil temperature and oil pressure, and maintains the optimum oil pressure according to the engine speed (the oil pump speed is proportional to the engine speed). It is an oil passage system to do.

  FIG. 4 shows the configuration of the oil pump oil passage system of the present invention. The oil passage system has a structure in which a hydraulic relief valve and a temperature-sensitive relief valve are arranged in parallel to cope with oil temperature and hydraulic pressure. In FIG. 4, the oil passage system has a configuration in which the oil in the oil pan 8 is pumped up by the oil pump 9, is circulated through the engine E and auxiliary equipment, and is returned to the oil pan 8 again. That is, the oil in the oil pan 8 is circulated in the oil circulation circuit 6. The oil circulation circuit 6 includes a pump upstream flow path 60 connected to the suction port of the oil pump 9, a pump downstream flow path 61 connected to the discharge port of the oil pump 9, and a return located downstream of the engine E and the auxiliary equipment. It consists of a flow path 62.

  In addition, a hydraulic relief valve A and a temperature-sensitive relief valve B are connected to the oil circulation circuit 6 in parallel starting from the pump downstream flow path 61. The suction port of the hydraulic relief valve A is referred to as a first relief inflow portion 33, and the discharge port is referred to as a first relief outflow portion 34. The suction port of the temperature-sensitive relief valve B is referred to as a second relief inflow portion 51, and the discharge port is referred to as a second relief outflow portion 52. The first relief outflow portion 34 and the second relief outflow portion 52 cause the oil pan 8 to relieve oil through the first relief downstream channel 62A and the second relief downstream channel 62B, respectively.

  The hydraulic relief valve A is a valve that adjusts the opening amount of the relief outflow portion by moving the valve body 1 by the balance between the urging force of the elastic member 2 and the hydraulic pressure. On the other hand, the temperature-sensitive relief valve B is a valve that increases or decreases the opening area of the relief outflow portion by moving the temperature-sensitive valve body 4 with a thermo-element, a shape memory alloy, or a bimetallic temperature-sensitive member.

  In addition, the oil pump oil passage system of the present invention includes an engine tachometer C, an oil temperature detector D, a hydraulic pressure detector F, and an engine control unit (hereinafter referred to as ECU) -G. . The ECU-G inputs the engine speed from the engine tachometer C, the oil temperature in the pump downstream channel 61 from the oil temperature detection unit D, and the oil pressure in the pump downstream channel 61 from the oil pressure detection unit F. Determine whether the warm valve B is normal or faulty and output.

  If the output value of the oil pressure detection unit F satisfies a predetermined condition, the temperature-sensitive relief valve B has failed, and the ECU-G determines this and outputs it. Here, the oil temperature detection part D can be comprised by the mechanism which estimates oil temperature from an oil temperature sensor or water temperature or an engine load, for example.

  The engine speed-hydraulic characteristic curve in the design of the oil pump oil passage system of the present invention when the oil temperature is constant is uniquely determined. However, due to variations in the dimensions of parts and member characteristics constituting the system, there is a range in which the actual engine speed-hydraulic characteristic curve may be normal. It is the engine speed-hydraulic characteristic curve of FIG. 3B that shows this width. The engine speed-hydraulic characteristic curve of the new and normal oil pump oil passage system according to the present invention falls between the hydraulic upper limit curve I and the hydraulic lower limit curve I.

  The temperature sensitive member related to the opening and closing of the temperature sensitive relief valve B decreases with the passage of time due to the oil temperature. For this reason, in the temperature-sensitive relief valve B, the relief cut-off becomes sweeter over time. When this affects the oil pump oil passage system, the hydraulic upper limit value I and the hydraulic lower limit value I are reduced to the hydraulic upper limit value II after the passage of time and the hydraulic pressure lower limit value II after the passage of time (FIG. 3B). ). However, such a decrease in hydraulic pressure is within an allowable range and is not a malfunction.

  The failure to be detected for the temperature-sensitive relief valve B is that the valve body stops moving and is always in the relief state or always closed. If it becomes like this, the plot point of an engine speed-oil pressure will remove | deviate from between the oil pressure upper limit curve I of FIG. 3 (B), and the oil pressure lower limit curve II after aging. Therefore, in the oil pump oil passage system according to the present invention, the engine control unit (ECU) performs arithmetic processing so that the engine speed-hydraulic pressure plot points are the oil pressure upper limit curve I and the oil pressure lower limit curve II after aging. It is determined whether or not the relief valve is faulty by determining whether or not it is out of the range.

  Hereinafter, the failure determination process performed by ECU-G in the oil pump oil passage system of the present invention will be described. FIG. 1 is a flowchart showing an example of failure determination of the oil pump oil passage system of the present invention. The ECU-G, called an engine control unit, has an arithmetic unit for controlling electrical components of the automobile and a memory, and is activated by turning on the ignition switch of the automobile (stp1). After startup, the upper limit value and lower limit value of the hydraulic pressure in the design for each oil temperature of the pump downstream flow path 61 are read from the nonvolatile memory and held in the memory used for calculation (stp2).

  The ECU-G is given a command for performing failure determination processing at regular intervals. This may be interrupted at regular intervals. The presence / absence of a failure determination process due to an interrupt or the like is checked (stp3). If there is no determination command, processing other than failure determination is performed (stp4). On the other hand, in step 5, the engine speed, the oil temperature, and the hydraulic pressure information are input to the calculation memory in order to start the determination process.

  Next, reference is made to the design lower limit value S1 of the hydraulic pressure at the time of the corresponding engine speed R (rpm) and the oil temperature T ° C. from the information held at stp2 (stp6). With respect to the design lower limit value S1, the first hydraulic pressure determination value is determined by correcting the change with time of the temperature sensitive member used in the temperature sensitive relief valve B by the first hydraulic pressure determination value determination process. (Stp7).

  Details of the first hydraulic pressure determination value determination process will be described later. Next, the hydraulic pressure input at stp5 is compared with the first hydraulic pressure determination value (stp8), and if the hydraulic pressure is equal to or higher than the first hydraulic pressure determination value, the result is “false” and the process proceeds to stp10. On the other hand, if the hydraulic pressure is smaller than the first hydraulic pressure determination value, it is determined that a failure has occurred, so a failure determination output is made as “true” (stp9).

  Thereafter, the steps below stp3 are repeated. Here, the relationship between the oil temperature held in the calculation memory at stp2, the number of revolutions, the oil pressure upper limit value, the oil pressure lower limit value, and the first oil pressure determination value determined at stp7 is shown in FIG. ). FIG. 3A is a diagram in which the oil pressure upper limit value and the oil pressure lower limit value from the low engine speed to the high engine speed are plotted at the oil temperature T ° C.

  The first hydraulic pressure determination value is determined by subtracting the correction amount from the designed hydraulic lower limit S1 at the oil temperature T ° C. and the rotation speed R (rpm). The correction amount calculation method will be described later as a first hydraulic pressure determination value determination process. In the calculation at stp7, it is not necessary to plot as shown in FIG. 3A, and the values of T, R, and S1 are sufficient.

  Steps 10 and below are failure determination processing based on the designed hydraulic pressure upper limit value. At stp10, the corresponding design hydraulic pressure upper limit value S2 is referred to, and S2 is set as the second hydraulic pressure determination value. Next, the hydraulic pressure is compared with the second hydraulic pressure determination value (stp11), and if the hydraulic pressure is equal to or less than the second hydraulic pressure determination value, the process returns to step 3 as 'false'. If the hydraulic pressure is greater than the second hydraulic pressure determination value, a failure determination is output (stp12), and then the process returns to stp3. Thereafter, the ECU-G performs processing other than the failure determination (stp4), and repeats the steps from stp5 if there is a determination command.

  In the above description, the flow is described in which the determination process is performed with the second hydraulic pressure determination value when the first hydraulic pressure determination value determines that there is no failure. However, the present invention is not limited to this. A flow may be used in which determination processing is performed with the first hydraulic pressure determination value when there is no failure after determination. Alternatively, both the first hydraulic pressure determination value and the second hydraulic pressure determination value may always be determined, and a logical sum regarding the occurrence of a failure may be taken as the final determination.

  FIG. 2 shows a processing flow of the ECU-G according to the second embodiment of the oil pump oil passage system of the present invention. In FIG. 2, steps 1 to 5 are the same as the processing flow described with reference to FIG. In this processing flow, when the oil temperature is a high oil temperature, a failure determination is made with the first oil pressure determination value. Then, when the oil temperature is non-high and the oil temperature is low, the failure is determined with the second oil pressure determination value.

  Since the viscosity of the oil changes depending on the oil temperature, the rate of increase of the hydraulic pressure with respect to the rotational speed of the engine E when not relieving at all also changes. A low oil temperature is set to approximately 50 degrees or less where the increase rate of the hydraulic pressure is high with respect to the rotational speed of the engine E. On the other hand, a high oil temperature is set to approximately 80 ° C. or more at which the rate of increase in hydraulic pressure with respect to the rotational speed decreases. And in the state located between low oil temperature and high oil temperature, suppose that the oil temperature which is not contained in neither is called middle oil temperature.

  Here, the low oil temperature is set to approximately 50 ° C. or lower, but the oil temperature is not strictly limited to this, and the oil temperature immediately after the engine is started may be included. Further, although the oil temperature is generally about 80 ° C. or higher, the oil temperature is not strictly limited to this, and the oil temperature may be higher than the temperature at the time when the warm-up operation is completed.

  It is determined whether the oil temperature is high (stp13). If the oil temperature is not high, it is determined as “false” and the process proceeds to a low oil temperature determination process (stp14). On the other hand, when the oil temperature is high, the process proceeds to stp6, stp7, and stp8 as “true” at stp13. The processes of stp6 to stp8 are as described above. If “true” in stp8, the process returns to stp3 via a failure determination output (stp9).

  The low oil temperature is determined at stp14. If the oil temperature is not low, the process returns to step 3 as "false". On the other hand, if the oil temperature is low, “true” is executed, and stp10, stp11, and stp12 are executed. The processing from stp10 to stp12 is as described above.

  In the flow according to the second embodiment, when the oil temperature is high, the failure determination is made with the first oil pressure determination value. When no failure is detected, the failure is determined with the second oil pressure determination value. Any of these determinations may be performed first. In this flow, failure determination is not performed when neither the high oil temperature nor the low oil temperature is used.

  Here, details of the first hydraulic pressure determination value determination process of stp7 will be described. The amount of movement in the axial direction (so-called lift amount) of the temperature-sensitive member related to the opening and closing of the temperature-sensitive relief valve B decreases with time. This decrease in lift amount increases with time, but as the secular change progresses to a certain decrease in lift amount, the decrease in lift amount does not progress so much, and the lift amount due to oil temperature change is It will not change so much.

  For example, it is assumed that a maximum lift amount of 6 mm at the time of a new article due to increase / decrease in oil temperature decreases to 5 mm due to secular change. Then, since the opening area of the second relief outflow portion 52 of the temperature-sensitive relief B becomes larger when it changes over time than when it is new, the hydraulic pressure decreases accordingly.

  This decrease in hydraulic pressure is uniquely determined by the window shape of the opening portion of the second relief outflow portion 52. The first hydraulic pressure determination value is determined by “hydraulic pressure lower limit value−hydraulic pressure decrease due to secular change” in consideration of the decrease in hydraulic pressure. For example, the first hydraulic pressure determination value can be determined based on a statistical amount such as an average value, a mode value, a maximum value, and a median value of the secular change amount of the temperature sensitive member.

  FIG. 6 (A) is a diagram showing an example of an oil pump and a relief valve constituting the oil pump oil passage system of the present invention. The hydraulic relief valve A and the temperature-sensitive relief valve B are incorporated in the pump housing 91, and the hydraulic relief valve A and the temperature-sensitive relief valve B are integrally combined to form a unit and incorporated in the oil pump 9. FIG. 6B shows a cross-sectional view of the region α occupied by the relief valve.

  Reference numeral 98 denotes a drive shaft. The drive shaft 98 is rotated by the power of an engine (not shown) to rotate the inner rotor 95 and the outer rotor 96. The hydraulic relief valve A includes a valve body 1, an elastic member 2, and a valve housing 3. The temperature sensitive relief valve B is provided in the pump downstream flow path 61. The pump downstream flow path 61 is a flow path that follows the discharge portion 9B of the pump housing 91. Here, the pump downstream flow path 61 has a structure that is integrally formed and incorporated in the pump housing 91.

  The portion of the pump downstream flow path 61 formed in the pump housing 91 is referred to as an in-housing pump downstream flow path 611. The in-housing pump downstream flow path 611 is a flow path that constitutes the discharge portion 9 </ b> B, and is an oil path from the discharge port 94 to a discharge port that discharges oil to the outside of the pump housing 91.

  A valve housing 3 is formed at the lower end surface of the in-housing pump downstream flow path 611, and the valve body 1 and the elastic member 2 are mounted on the valve housing 3, and the valve body 1 is always elastically upward by the elastic member 2. It is energized. The upper end portion of the valve housing 3 is an opening 3a at a portion that intersects the in-housing pump downstream flow path 611. The opening 3 a is a portion used as a portion corresponding to the first relief inflow portion 33.

  The hydraulic relief valve A performs a relief (discharge) operation by the discharge pressure from the oil pump 9. The hydraulic relief valve A includes a valve body 1, an elastic member 2, and a valve housing 3. In the valve housing 3, the valve body 1 is housed so as to be slidable up and down, and is urged upward by an elastic member 2 by a coil spring.

  The upper surface of the valve body 1 faces the in-housing pump downstream flow path 611 and receives hydraulic pressure. The valve body 1 remains in a balance position between the hydraulic pressure and the elastic member 2. As the hydraulic pressure increases and moves downward, the opening of the first relief outflow portion 34 increases and the relief amount increases.

  The temperature-sensitive relief valve B includes a temperature-sensitive valve body 4 and a temperature-sensitive housing 5. The temperature-sensitive valve body 4 may be fixed to the oil pump 9 with a holder 44. The temperature sensitive relief valve B is provided in the in-housing pump downstream flow path 611 and adjacent to the hydraulic relief valve A on the downstream side. The temperature sensitive housing 5 is formed so as to branch from the in-housing pump downstream flow path 611.

  The temperature-sensitive housing 5 is formed along the vertical direction of the pump housing 91 and is formed in a cylindrical space. The upper end portion of the temperature-sensitive housing 5 is an opening 5a at a portion that intersects the in-housing pump downstream flow path 611. The opening 5 a is a portion used as a portion corresponding to the second relief inflow portion 51.

  A second relief outflow portion 52 is formed at an appropriate position on the inner peripheral side surface 5b. The second relief outflow portion 52 is connected to the oil pan 8 or the suction port 93, and the relief oil flowing out from the second relief outflow portion 52 is sent to the oil pan 8 or the intake port 93.

  The temperature sensing valve portion 41 of the temperature sensing valve body 4 has a substantially cylindrical cup shape. A piston 42 b of a temperature sensing drive unit 42 is connected to the temperature sensing valve unit 41. And in the temperature sensing valve part 41, the inflow hole is formed, and oil can escape from a cup opening part. When the oil temperature is low, the piston 42b connected to the temperature sensing drive unit 42 is slightly pulled upward, so that the temperature sensing valve unit 41 is also raised upward.

  Then, the second relief outflow part 52 is fully opened, the relief amount from the temperature-sensitive relief valve B is maximized, and the hydraulic pressure reduction is maximized. When the oil temperature rises, the piston 42b connected to the temperature sensing drive unit 42 descends, and the temperature sensing valve unit 41 closes the second relief outflow part 52 and blocks the relief.

  As described above, the temperature-sensitive drive unit 42 includes the cylinder 42a and the piston 42b, and the cylinder 42a is filled with thermowax. The thermo wax expands and contracts depending on the detected oil temperature, and performs an expansion / contraction operation by the piston 42b protruding and retracting with respect to the cylinder 42a. The part for detecting the oil temperature is defined as a temperature sensor 42c.

  The temperature sensing drive unit 42 is mounted at a position corresponding to the location where the temperature sensing housing 5 is formed in the in-housing pump downstream flow path 611. In the in-housing pump downstream flow path 611, a mounting portion 97 to which the temperature sensitive driving portion 42 is mounted is formed. Specifically, a mounting portion 97 is formed as a space that allows the temperature-sensitive drive unit 42 to be disposed at a position immediately above the position where the temperature-sensitive housing 5 is formed in the in-housing pump downstream flow path 611. .

  Although not specifically illustrated, the temperature-sensitive relief valve B is configured such that the shaft end of the piston 42b of the temperature-sensitive driving unit 42 is brought into contact with the holder 44, and a temperature-sensitive sensor 42c is disposed below the piston 42b. It is good also as a structure by which the temperature sensing valve part 41 is arrange | positioned under 42c. Even in this case, the temperature sensing valve portion 41 and the temperature sensing sensor 42c both move up and down due to the expansion and contraction of the piston 42b. The present invention is also established for this configuration and is within the scope of the technical idea of the present invention.

  As described above, the amount of change due to the oil temperature of the temperature-sensitive member related to the opening and closing of the temperature-sensitive relief valve B decreases with time. For this reason, in the temperature-sensitive relief valve B, the relief cut-off becomes sweeter over time. If this affects the oil pump oil passage system, the upper hydraulic pressure limit and lower hydraulic pressure limit are lowered.

  Based on this, the normality / failure of the temperature-sensitive relief valve B by the hydraulic pressure detection means “at a lower hydraulic pressure than normal” is determined by determining the decrease in deformation amount with respect to the oil temperature due to secular change of the temperature-sensitive member. Correction is made by the determination value determination process (stp7), and the hydraulic pressure is set lower than the hydraulic pressure determination value for determining normality / failure without considering the secular change of the non-electronic control member. By doing so, it is possible to avoid the problem that the oil pressure decreases after aging and is determined to be a failure even though it is normal.

  In the case where it is determined that the oil pressure is further “higher” than the normal oil pressure range and the failure is determined to be a failure, the normality / failure determination of the temperature-sensitive relief valve B by the oil pressure detection means is due to the secular change of the non-electronic control member. Without considering the decrease in deformation with respect to the oil temperature, without considering the secular change of the non-electronic control member, the deviation from the hydraulic pressure expected at the time of a new product is deviated to the higher hydraulic pressure side, or it is estimated by other parameters If the hydraulic pressure value is located, it can be determined that the temperature-sensitive relief valve B has failed.

  Since the oil pressure changes slightly due to secular change, if a failure is judged at a hydraulic pressure higher than the hydraulic pressure variation at the time of a new product, even if a secular change occurs, a normal product will not be misjudged as a failed product. .

  In general, an automobile is equipped with a hydraulic pressure detection device that detects hydraulic pressure to check the operation of an engine auxiliary machine or to ensure the operation. The oil pressure detecting device used by these can also function as the oil pressure detecting means of the present invention. By adding the functions of the hydraulic pressure detection means of the present invention to the already installed hydraulic pressure detection equipment without mounting the hydraulic pressure detection means of the present invention additionally, the number of parts can be reduced and the cost can be reduced and the space can be saved. The failure rate can be reduced.

  If a hydraulic pressure sensor is used as the hydraulic pressure detection means, the actual hydraulic pressure value can be detected in real time regardless of the engine speed. Since the actual hydraulic pressure value can be detected in real time, the normality / failure can be determined most accurately and always.

  A hydraulic switch can also be used as the hydraulic pressure detection means. The hydraulic switch includes a switch urged by an elastic body in a part of an electric circuit, and the switch moves by receiving hydraulic pressure. And a member that determines whether or not the hydraulic pressure higher than the predetermined pressure is applied by disconnecting or turning on the electrical circuit when the hydraulic pressure higher than the predetermined pressure is applied. is there. Since the hydraulic switch is less expensive than the hydraulic sensor, the cost can be reduced.

  Instead of actually measuring the oil pressure, an estimated oil pressure value based on other parameters representing the state of the engine may be used instead of the oil pressure detecting means. For example, the hydraulic pressure can be estimated by detecting the relative rotational fluctuation degree of the housing and the movable part of the valve timing variable mechanism described in Japanese Patent No. 5251658.

  For example, as in the valve timing control device described in Japanese Patent No. 3730809, the oil pressure can be estimated based on the oil temperature and the operating state of the internal combustion engine. Even if the oil pressure is not actually measured, an oil pressure value estimated by calculation from a measured value other than the oil pressure may be used for determining a failure of the relief valve.

  Since there is no need to separately arrange a dedicated oil pressure detecting means for measuring the oil pressure, it is possible to reduce costs, save space, and reduce the failure rate. Note that the means for estimating the oil pressure is not limited to the above-mentioned means given as an example, and it is only necessary that the oil pressure can be estimated from other parameters such as the water temperature.

  As in the oil pump oil passage system of the present patent invention, the oil passage using the temperature-sensitive relief valve B is completely closed when the oil temperature is high, thereby preventing a decrease in hydraulic pressure. Nevertheless, when the hydraulic pressure is lower than the first hydraulic pressure determination value, it is determined that the temperature-sensitive relief valve B is malfunctioning with the valve opened.

  Therefore, during the high oil temperature period or only during the high oil temperature period, it is determined that a failure has occurred when a hydraulic pressure lower than the first hydraulic pressure determination value is detected, thereby determining a failure at a high oil temperature. Can be reliably performed and erroneous determination on the lower limit of the hydraulic pressure at the time of low oil temperature can be prevented. What has realized this principle is the second embodiment of the oil pump oil passage system of the present invention, which is a system whose processing flow is shown in FIG.

  As in the oil pump oil passage system of the present patent invention, the oil passage using the temperature-sensitive relief valve B is in a fully-relieved state at a low oil temperature, and the oil pressure is difficult to increase. Nevertheless, if it is off to the high pressure side, it is determined that the temperature-sensitive relief valve B has failed with the valve closed.

  Therefore, the failure determination at the time of the low oil temperature is determined by determining that the oil pressure is higher when the oil pressure higher than the second oil pressure determination value is detected only during the low oil temperature period or during the low oil temperature period. Can be reliably performed, and erroneous determination on the upper limit side of the hydraulic pressure when the oil temperature is high can be prevented. What has realized this principle is the second embodiment of the oil pump oil passage system of the present invention, which is a system whose processing flow is shown in FIG.

A ... Hydraulic relief valve, 1 ... Valve body, 2 ... Elastic member, 3 ... Valve housing, 3a ... Opening,
33 ... 1st relief inflow part, 34 ... 1st relief outflow part, B ... temperature-sensitive relief valve,
4 ... temperature sensing valve body, 41 ... temperature sensing valve section, 42 ... temperature sensing drive section, 42a ... cylinder,
42b ... piston, 42c ... temperature sensor, 44 ... holder, 5 ... temperature sensitive housing,
5a ... Opening, 5b ... Inner peripheral side surface, 51 ... Second relief inflow portion, 52 ... Second relief outflow portion,
6 ... Oil circulation circuit, 60 ... Pump upstream flow path 61 ... Pump downstream flow path,
611 ... Pump downstream flow path in housing, 62 ... Return flow path,
62A ... 1st relief downstream flow path, 62B ... 2nd relief downstream flow path, 8 ... Oil pan,
9 ... Oil pump, 91 ... Pump housing, 93 ... Suction port, 94 ... Discharge port,
E ... Engine, C ... Engine tachometer, D ... Oil temperature detector, F ... Oil pressure detector,
G: Engine control unit (ECU).

Claims (8)

  An arithmetic unit, a hydraulic relief valve, a temperature-sensitive relief valve that is driven by the oil temperature level, and that increases or decreases the opening area of the relief outflow portion with a thermo-element, shape memory alloy, or bimetal temperature sensing member, and engine rotation Oil that includes a gauge, an oil temperature detection unit, and a hydraulic pressure detection unit that detects the hydraulic pressure at a predetermined engine speed, and performs a hydraulic pressure determination process that determines a failure when the pressure falls outside the normal hydraulic range In the pump oil passage system, a first hydraulic pressure determination value determining process for correcting a decrease in the deformation amount with respect to the oil temperature due to a secular change of the temperature sensitive member and outputting a first hydraulic pressure determination value by the arithmetic unit, The oil is characterized in that when the oil pressure detection unit detects an oil pressure lower than the first oil pressure determination value, it is determined that the temperature-sensitive relief valve has failed. Oil pump oil passage system for the determination process.   2. The oil pump oil passage system according to claim 1, wherein the arithmetic unit sets a predetermined oil pressure upper limit value as a second oil pressure determination value, and an oil pressure higher than the second oil pressure determination value is detected by the oil pressure detection unit. An oil pump oil passage system that performs the oil pressure determination process, wherein the temperature-sensitive relief valve is determined to be defective.   The oil pump oil passage system according to claim 1 or 2, wherein the oil pressure detection unit is replaced with a hydraulic pressure detection device mounted on an engine accessory.   4. The oil pump oil passage system according to claim 1, wherein the oil pressure detection unit is a hydraulic pressure sensor. 5.   4. The oil pump oil passage system according to claim 1, wherein the oil pressure detection unit is a hydraulic switch. 5.   An arithmetic unit, a hydraulic relief valve, a temperature-sensitive relief valve that is driven by the oil temperature level, and that increases or decreases the opening area of the relief outflow portion with a thermo-element, shape memory alloy, or bimetal temperature sensing member, and engine rotation In an oil pump oil passage system that includes a gauge and an oil temperature detection unit, and performs a hydraulic pressure determination process that determines that a failure occurs when the hydraulic pressure range deviates to a low-pressure side or a high-pressure side from a hydraulic range that is determined to be normal, A first hydraulic pressure determination value determining process for correcting a decrease in the deformation amount with respect to the oil temperature due to the secular change of the temperature sensitive member and outputting the first hydraulic pressure determination value is performed, and a predetermined hydraulic upper limit value is set as the second hydraulic pressure determination value. The oil pressure at a predetermined engine speed is estimated from the output parameters of the engine or engine auxiliary equipment, and the estimated oil pressure is lower than or lower than the first oil pressure determination value. , Wherein when higher than the second oil pressure determination value, the hydraulic determination process oil pump oil passage system of a to and determines that the temperature sensitive relief valve is faulty.   The oil pump oil passage system according to any one of claims 1, 2, 3, 4, 5, or 6, wherein the oil temperature detection unit is set to a high level by the computing unit. An oil pump oil passage system for performing the oil pressure determination process, wherein a failure determination of the temperature-sensitive relief valve is made based on the first oil pressure determination value during a period indicating an oil temperature. The oil pump oil passage system according to claim 2 or 6, wherein the temperature relief is based on the second hydraulic pressure determination value by the arithmetic unit during a period when the oil temperature detection unit indicates a low oil temperature. An oil pump oil passage system for performing the hydraulic pressure determination processing, characterized by performing valve failure determination.

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