CN114321300A - Intelligent tensioner for automobile timing toothed chain system and control method thereof - Google Patents
Intelligent tensioner for automobile timing toothed chain system and control method thereof Download PDFInfo
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Abstract
The invention discloses an intelligent tensioner for an automobile timing toothed chain system and a control method thereof, and belongs to the technical field of automobile engines. The intelligent tensioner consists of a hydraulic cylinder type tensioning device, an electro-hydraulic servo valve, an ECU, a D/A converter, two pressure sensors and a displacement sensor. The control method comprises the following steps: detecting an initial extension amount DX of a plunger of a tensioning device when an engine is started, uploading the DX to an upper ECU, and determining a correction coefficient K2; detecting the pressure following amount between the loose edge of the chain and the tensioning plate and between the tensioning plate and the tensioning device, and calculating the control driving current I of the electro-hydraulic servo valve; the ECU controls the electro-hydraulic servo valve through the D/A converter, and enables the chain vibration to be stabilized within a certain amplitude range in a control cycle. The invention can obviously reduce the fluctuation of loose edges of the chain, and improve the overall reliability of the timing system of the engine and the overall matching degree and coordination degree of the timing system and the automobile electric control system.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to an intelligent tensioner for an automobile timing toothed chain system and a control method thereof.
Background
Compared with the toothed belt transmission, the toothed chain transmission has the advantages of long service life, high reliability, high motion precision and the like, so that more and more automobile engine manufacturers adopt the toothed chain transmission as the main transmission form of the engine timing. The traditional tensioning mechanism of the timing toothed chain system of the automobile engine is a pure mechanical device, on one hand, the device can only limit the fluctuation of the chain to a certain extent, but cannot control the existing fluctuation of the chain, and the uncontrollable fluctuation can cause the abrasion of the chain to be aggravated; on the other hand, the device is a fixed value for the chain tension, and cannot be effectively adjusted according to the specific working condition requirements of the engine, and cannot compensate the fluctuation aggravation caused by chain abrasion. For modern automobile engines, especially for engines of automobiles with intelligent driving systems, the variable timing mechanism is more complex, the timing precision/reliability requirement is higher, and the electric control system requirement is more precise, so that the traditional timing tooth-shaped chain transmission system can not meet the development requirement of the modern automobile engines gradually.
The existing chinese patent CN101782467A relates to a tensioner with a function of monitoring and detecting a timing system, which is monitored by a sensor, but cannot effectively control the tensioner and its chain fluctuation; chinese patent CN112709791A relates to a tensioner oil pressure regulating system and oil pressure regulating method for an automobile engine, and proposes a technical solution for effectively preventing a tensioner plunger from vibrating and knocking a chain, but the technical solution also fails to effectively solve the problems of aggravation of chain fluctuation and reduction of reliability under the conventional tensioning solution.
Disclosure of Invention
The invention provides an intelligent tensioner for an automobile timing toothed chain system and a control method thereof, and aims to reduce the fluctuation of the automobile timing toothed chain system to the maximum extent, reduce the abrasion of a chain, and improve the reliability and the service life of the tensioning system.
An intelligent tensioner for an automobile timing toothed chain system comprises a hydraulic cylinder type tensioning device, an electro-hydraulic servo valve, an ECU, a D/A converter, a first pressure sensor, a second pressure sensor and a displacement sensor, wherein the hydraulic cylinder type tensioning device is integrally arranged on the loose side of a timing toothed chain transmission system chain, the first pressure sensor is positioned between a transmission system tensioning plate and the hydraulic cylinder type tensioning device, the second pressure sensor is positioned between the transmission system tensioning plate and the loose side of the transmission system chain, the displacement sensor is positioned on the side edge of a tensioning device plunger and used for detecting the initial extension DX of the tensioning device plunger, the first pressure sensor, the second pressure sensor and the displacement sensor are respectively connected with the ECU, and data detected by the first pressure sensor, the second pressure sensor and the displacement sensor are transmitted to the ECU through signal lines, the D/A converter is connected with the ECU, the electro-hydraulic servo valve is connected with the D/A converter, and the hydraulic cylinder type tensioning device is connected with an external hydraulic system through the electro-hydraulic servo valve;
in the hydraulic cylinder type tensioning device, a tensioning device plunger divides a hydraulic cavity into a tensioning device rear cavity and a tensioning device front cavity, and a tensioning device spring with certain rigidity is placed in the tensioning device rear cavity;
a control method of an intelligent tensioner for an automobile timing toothed chain system comprises the following steps:
s1, detecting an initial stretching amount DX of a plunger of the tensioning device when the engine is started, wherein the initial stretching amount DX is detected by a displacement sensor, DX is a relative value relative to an ideal position of the plunger of the tensioning device, the measured value can only be an integer, when DX is 0, the chain is not abraded, when DX is greater than 0, the chain is abraded, the larger DX is the larger the abrasion of the chain is, when DX is less than 0, the system is mistaken, and the system is stopped and alarmed at the same time, after the DX is detected, an ECU stores the value of DX and uploads the value to a superior ECU, and the superior ECU calculates a correction coefficient K2 after considering the requirements of the engine and other electronic control systems and returns the value to the ECU;
s2, detecting pressures F1 and F2, calculating a driving control current I of an electro-hydraulic servo valve, detecting a pressure F1 between a plunger of a tensioning device and a tensioning plate by a first pressure sensor, detecting a pressure F2 between the tensioning plate and a loose edge of a chain by a second pressure sensor, calculating a pressure following quantity DF (F1-F2) by a system ECU (electronic control unit) after obtaining pressure values F1 and F2, extracting an electric control basic control coefficient K1 from a ROM (read only memory) according to values of F1, F2 and DF, calculating a control current coefficient according to K1K 2 by the ECU, and finally calculating the driving control current I of the electro-hydraulic servo valve according to a formula I K DF;
s3, the ECU transmits the calculated value of I to a D/A converter, the D/A converter converts the value of I into a control current and drives a tensioner plunger to move, when F1 is larger than F2, the pressing force of the tensioner plunger on the slack side of the chain is insufficient, at the moment, an electro-hydraulic servo valve is controlled by the drive control current I which is larger than zero, the oil pressure of a tensioner rear cavity is increased, the tensioner plunger extends, the output pressure is increased, and F1 is equal to F2; when F1< F2, the pressing force of the tensioner plunger on the loose edge of the chain is too large, and the electro-hydraulic servo valve is controlled by the driving control current I which is less than zero, so that the oil pressure of the tensioner rear cavity is reduced at the moment, the tensioner plunger is retracted, and the output pressure is reduced, so that F1 is F2; when F1 is F2, the pressing force of the tensioner plunger on the chain loose edge is right, the drive control current I of the electro-hydraulic servo valve is controlled to be zero, the oil pressure of the tensioner rear cavity is maintained at the present moment, so that the tensioner plunger is unchanged, the output pressure is unchanged, and after the operation is finished, the operation jumps to S2 to continue to circulate;
further, in step S1, the value of K2 may be calculated by the following formula:
K2＝K21·K22；
in the formula, K22 is a system compensation coefficient and is related to the specific working condition and the corresponding requirement of the engine; k21 is the tensioner spring rate compensation factor, which can be calculated by the following equation:
K21＝X/(X-DX)；
wherein X is the ideal compression of the tensioner spring when the tensioner plunger is in the equilibrium position; DX is offset of the same balance position when the tensioner plunger is started;
further, in step S2, the value of K1 is a tested constant, which is related to the specific system layout and does not affect the control result within a certain range.
The invention has the beneficial effects that:
the chain tensioning device is suitable for tensioning chains of timing toothed chain transmission systems of most engines, on one hand, the tension force of the tensioning device on the tensioning plate can be controlled, the fluctuation of loose edges of the chains is obviously reduced, the abrasion of the chains is reduced, and the reliability and the effectiveness of the timing toothed chain transmission system of the automobile engine are obviously improved; on the other hand, the scheme of the invention can feed back the relevant data of the timing system to the superior ECU in real time and can carry out real-time control and adjustment according to the requirement of the superior ECU, thereby effectively improving the overall matching degree and the coordination degree of the timing system and the automobile electric control system.
Drawings
FIG. 1 is a flow chart of a control method of the present invention;
FIG. 2 is a schematic diagram of the components and location of the present invention;
FIG. 3 is a schematic diagram of the control method of the present invention F1> F2;
FIG. 4 is a schematic diagram of a control method of F1< F2 in accordance with the present invention;
FIG. 5 is a logic diagram of the control method of the present invention;
FIG. 6 is a graph of the amplitude of chain oscillations under the present invention.
In the figure: 1.1, a first pressure sensor, 1.2, a second pressure sensor, 1.3, a displacement sensor, 2, a hydraulic cylinder type tensioning device, 2.1, a tensioning device rear cavity, 2.2, a tensioning device front cavity, 2.3, a tensioning device plunger, 2.4, a tensioning device spring, 3, an electro-hydraulic servo valve, 4, an ECU, 5, a D/A converter, 6, a superior ECU, 7, a tensioning plate, 8 and a chain loose edge
Detailed Description
Referring to fig. 1 to 6, an intelligent tensioner for a timing toothed chain system of an automobile comprises a hydraulic cylinder type tensioning device 2, an electro-hydraulic servo valve 3, an ECU4, a D/a converter 5, a first pressure sensor 1.1, a second pressure sensor 1.2 and a displacement sensor 1.3, wherein the hydraulic cylinder type tensioning device 2 is integrally arranged at the side of a slack side 8 of a timing toothed chain transmission system chain, the first pressure sensor 1.1 is arranged between a transmission system tensioning plate 7 and the hydraulic cylinder type tensioning device 2, the second pressure sensor 1.2 is arranged between the transmission system tensioning plate 7 and the transmission system chain slack side 8, the displacement sensor 1.3 is arranged at the side of a tensioning device plunger 2.3 and used for detecting an initial extension DX of the tensioning device plunger 2.3, the first pressure sensor 1.1, the second pressure sensor 1.2 and the displacement sensor 1.3 are respectively connected with an ECU4, the first pressure sensor 1.1, the second pressure sensor 1.1, the D, Data measured by a second pressure sensor 1.2 and a displacement sensor 1.3 are transmitted to an ECU4 through signal lines, a D/A converter 5 is connected with an ECU4, an electro-hydraulic servo valve 3 is connected with the D/A converter 5, and a hydraulic cylinder type tensioning device 2 is connected with an external hydraulic system through the electro-hydraulic servo valve 3;
in the hydraulic cylinder type tensioning device 2, a tensioning device plunger 2.3 divides a hydraulic cavity into a tensioning device rear cavity 2.1 and a tensioning device front cavity 2.2, and a tensioning device spring 2.4 with certain rigidity is placed in the tensioning device rear cavity 2.1;
a control method of an intelligent tensioner for an automobile timing toothed chain system comprises the following steps:
s1, detecting an initial extension DX of a plunger 2.3 of the tensioning device when the engine is started, wherein the initial extension DX is detected by a displacement sensor 1.3, DX is a relative value relative to an ideal position of the plunger 2.3 of the tensioning device, the measured value can only be an integer, when DX is 0, the chain is not abraded, when DX >0, the chain is abraded, the larger DX is, the abrasion of the chain is larger, when DX is less than 0, the system is in error, and meanwhile, a halt alarm is given, after the DX is detected, an ECU4 stores the value and uploads the value to a superior ECU6, and the superior ECU6 calculates a correction coefficient K2 after considering the requirements of the engine and other electric control systems and returns the correction coefficient K2 to the ECU 4;
s2, detecting pressures F1 and F2, calculating a driving control current I of the electrohydraulic servo valve 3, detecting a pressure F1 between the tensioner plunger 2.3 and the tensioner plate 7 by the first pressure sensor 1.1, detecting a pressure F2 between the tensioner plate 7 and the chain slack side 8 by the second pressure sensor 1.2, obtaining pressure values F1 and F2 by the system ECU4, calculating a pressure following amount DF of F1-F2, extracting an electric control basic control coefficient K1 from the ROM by the ECU4 according to values of F1, F2 and DF, calculating a control current coefficient according to K1 · K2, and finally calculating a driving control current I of the electrohydraulic servo valve 3 according to a formula I of K · DF;
s3, the ECU4 transmits the calculated value of I to the D/a converter 5, the D/a converter 5 converts the value of I into a control current and drives the tensioner piston 2.3 to move, when F1> F2, the pressing force of the tensioner piston 2.3 on the chain slack side 8 is insufficient, and at this time, the electro-hydraulic servo valve 3 is controlled by the drive control current I greater than zero, so that the oil pressure of the tensioner rear cavity 2.1 is increased at this time, the tensioner piston 2.3 is extended, and the output pressure is increased, so that F1 is F2; when F1< F2, the tensioner plunger 2.3 exerts too much pressing force on the chain slack side 8, and the electrohydraulic servo valve 3 is controlled with a drive control current I smaller than zero, the oil pressure in the tensioner rear chamber 2.1 is reduced at this time, so that the tensioner plunger 2.3 is retracted, and the output pressure is reduced, so that F1 is F2; when F1 is equal to F2, the pressing force of the tensioner plunger 2.3 on the chain loose edge 8 is right, the driving control current I for controlling the electro-hydraulic servo valve 3 is zero, the oil pressure of the tensioner rear cavity 2.1 is maintained at the present moment, so that the tensioner plunger 2.3 is unchanged, the output pressure is unchanged, and after the operation is finished, the operation jumps to S2 to continue to circulate;
further, in step S1, the value of K2 may be calculated by the following formula:
K2＝K21·K22；
in the formula, K22 is a system compensation coefficient and is related to the specific working condition and the corresponding requirement of the engine; k21 is the tensioner spring 2.4 rate compensation factor, which can be calculated by the following equation:
K21＝X/(X-DX)；
wherein X is the desired amount of compression of the tensioner spring 2.4 when the tensioner plunger 2.3 is in the equilibrium position; DX is offset of the same equilibrium position when the tensioner plunger 2.3 is started;
further, in step S2, the value of K1 is a tested constant, which is related to the specific system layout and does not affect the control result within a certain range.
For example, for a timing system requiring 200N for a chain slack side tension, the tensioner plunger 2.3 has a diameter of 25mm, the plunger diameter of the tensioner plunger 2.3 is 12mm, the ideal compression amount of the tensioner spring 2.4 is X10 mm, if DX 2mm is detected, K21 is 10/(10-2) 1.25, if the engine has no compensation requirement for the timing system, K22 is 1, and K2 is K21 · K22 is 1.25 · 1 — 1.25, and through testing, K1 in this system is preferably 0.01.
Under the technical scheme of a general hydraulic tensioner, the chain slack fluctuation quantity of a timing toothed chain transmission system of the engine is about 0.4mm, but under the scheme of the intelligent tensioner for the automobile timing toothed chain system and the control method thereof, the fluctuation quantity can be controlled to be 0.04mm under an ideal state, as shown in FIG. 6.
Claims (4)
1. An intelligent tensioner for an automobile timing toothed chain system, characterized in that: the timing chain drive system tensioning device comprises a hydraulic cylinder type tensioning device (2), an electro-hydraulic servo valve (3), an ECU (4), a D/A converter (5), a first pressure sensor (1.1), a second pressure sensor (1.2) and a displacement sensor (1.3), wherein the hydraulic cylinder type tensioning device (2) is integrally arranged on the side of a timing toothed chain drive system chain loose edge (8), the first pressure sensor (1.1) is positioned between a transmission system tensioning plate (7) and the hydraulic cylinder type tensioning device (2), the second pressure sensor (1.2) is positioned between the transmission system tensioning plate (7) and the transmission system chain loose edge (8), the displacement sensor (1.3) is positioned on the side of a tensioning device plunger (2.3) and used for detecting the initial extension amount of the tensioning device plunger (2.3), and the first pressure sensor (1.1), the second pressure sensor (1.2) and the displacement sensor (1.3) are respectively connected with the ECU (4), data measured by a first pressure sensor (1.1), a second pressure sensor (1.2) and a displacement sensor (1.3) are transmitted to an ECU (4) through signal lines, a D/A converter (5) is connected with the ECU (4), an electro-hydraulic servo valve (3) is connected with the D/A converter (5), and a hydraulic cylinder type tensioning device (2) is connected with an external hydraulic system through the electro-hydraulic servo valve (3);
in the hydraulic cylinder type tensioning device (2), a tensioning device plunger (2.3) divides a hydraulic cavity into a tensioning device rear cavity (2.1) and a tensioning device front cavity (2.2), and a tensioning device spring (2.4) with certain rigidity is placed in the tensioning device rear cavity (2.1).
2. The control method of an intelligent tensioner for an automobile timing toothed chain system as set forth in claim 1, characterized in that: the method comprises the following steps:
s1, detecting an initial stretching amount DX of a plunger (2.3) of the tensioning device when the engine is started, wherein the initial stretching amount DX is detected by a displacement sensor (1.3), DX is a relative value relative to an ideal position of the plunger (2.3) of the tensioning device, the measured value can only be an integer, when DX is 0, the chain is not abraded, when DX is greater than 0, the chain is abraded, the larger DX is, the larger the chain is, when DX is less than 0, an error occurs in the system, and a halt alarm is given at the same time, after the DX is detected, the ECU (4) stores the value and uploads the value to a superior ECU (6), and after the requirements of the engine and other electronic control systems are considered, the ECU (6) calculates a correction coefficient K2 and returns the correction coefficient to the superior ECU (4);
s2, detecting pressures F1 and F2, calculating a driving control current I of an electro-hydraulic servo valve (3), detecting a pressure F1 between a tensioner plunger (2.3) and a tensioning plate (7) by a first pressure sensor (1.1), detecting a pressure F2 between the tensioning plate (7) and a chain loose edge (8) by a second pressure sensor (1.2), calculating a pressure following quantity DF (F1-F2) by a system ECU (4) after acquiring pressure values F1 and F2, extracting an electric control basic control coefficient K1 from a ROM according to values of F1, F2 and DF by the ECU (4), calculating a control current coefficient according to K1 and K2, and finally calculating a driving control current I of the electro-hydraulic servo valve (3) according to a formula I and K DF;
s3, the ECU (4) transmits the calculated value of I to a D/A converter (5), the D/A converter (5) converts the value of I into a control current and drives a tensioner plunger (2.3) to move, when F1> F2, the pressing force of the tensioner plunger (2.3) on a chain loose edge (8) is insufficient, at the moment, an electro-hydraulic servo valve (3) is controlled by the drive control current I which is larger than zero, the oil pressure of a tensioner rear cavity (2.1) is increased at the moment, so that the tensioner plunger (2.3) extends out, and the output pressure is increased, so that F1 is equal to F2; when F1< F2, the pressing force of the tensioner plunger (2.3) on the chain loose edge (8) is too large, and the electro-hydraulic servo valve (3) is controlled by a drive control current I which is less than zero, so that the oil pressure of the tensioner rear cavity (2.1) is reduced at the moment, the tensioner plunger (2.3) is retracted, and the output pressure is reduced, so that F1 is F2; when F1 is equal to F2, the pressing force of the tensioner plunger (2.3) on the chain loose edge (8) is right, the driving control current I for controlling the electro-hydraulic servo valve (3) is zero, the oil pressure of the tensioner rear cavity (2.1) is maintained at the present moment, so that the tensioner plunger (2.3) is not changed, the output pressure is not changed, and after the operation is finished, the operation jumps to S2 to continue the circulating operation.
3. The control method of an intelligent tensioner for an automobile timing toothed chain system as claimed in claim 2, characterized in that: in step S1, the value of K2 can be calculated by the following formula:
K2＝K21·K22；
in the formula, K22 is a system compensation coefficient and is related to the specific working condition and the corresponding requirement of the engine; k21 is the tensioner spring (2.4) stiffness compensation factor, which can be found by the following equation:
K21＝X/(X-DX)；
wherein X is the ideal compression of the tensioner spring (2.4) when the tensioner plunger (2.3) is in the equilibrium position; DX is the offset from the equilibrium position when the tensioner plunger (2.3) is activated.
4. The control method of an intelligent tensioner for an automobile timing toothed chain system as claimed in claim 2, characterized in that: in step S2, the value of K1 is a constant that has been tested, and is related to a specific system layout, and the control result is not affected within a certain range.
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| CN202111633865.8A CN114321300B (en) | 2021-12-29 | 2021-12-29 | Intelligent tensioner for automobile timing toothed chain system and control method thereof |
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| CN114321300B (en) | 2024-05-14 |
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