CN112067284A - Off-line detection method and device for automobile parking mechanism - Google Patents
Off-line detection method and device for automobile parking mechanism Download PDFInfo
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- CN112067284A CN112067284A CN202010941806.6A CN202010941806A CN112067284A CN 112067284 A CN112067284 A CN 112067284A CN 202010941806 A CN202010941806 A CN 202010941806A CN 112067284 A CN112067284 A CN 112067284A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/022—Power-transmitting couplings or clutches
Abstract
The invention belongs to the technical field of automobile testing, and particularly relates to an automobile parking mechanism offline detection method and device. The detection method comprises the following steps: controlling a motor to drive a driving end of the double-clutch transmission to drive a driven end to rotate; controlling a shifting fork of the double-clutch transmission to be engaged into a target gear; adjusting the real-time rotating speed of the output shaft to a first target rotating speed; controlling a parking mechanism to brake a driven end, and acquiring a parking angle of the parking mechanism when the rotating speed of an output shaft is reduced to zero; acquiring the corresponding parking time when the rotating speed of the output shaft is kept to be zero, controlling the parking mechanism to release the brake of the driven end, and acquiring the parking releasing angle of the parking mechanism; and confirming the test result of the parking mechanism according to the parking angle, the parking duration and the parking releasing angle. In the invention, the detection method utilizes the drag torque of the double-clutch transmission, a specific rack load motor is not needed, and the detection method is simple, convenient to operate and few in required equipment.
Description
Technical Field
The invention belongs to the technical field of automobile testing, and particularly relates to an automobile parking mechanism offline detection method and device.
Background
At present, a dual clutch transmission is increasingly applied to automobiles, wherein a driving end of the dual clutch transmission is connected with a power source, a driven end of the dual clutch transmission is respectively connected with two input shafts, one input shaft controls odd-numbered gears, the other input shaft controls even-numbered gears, when in gear shifting, one clutch is separated, the gears which are shifted are enabled to lose power, and meanwhile, the other clutch is combined, so that the gears which are shifted in advance are enabled to obtain power. The dual-clutch transmission comprises a transmission controller, sensors and an actuating mechanism, wherein the transmission controller collects signals of the sensors, carries out comprehensive processing and judgment and then controls the action of the actuating mechanism.
The automobile parking mechanism relates to safe important automobile parts, enables the pawl to fasten the parking gear to realize parking locking through automobile parking power transmission, and the automobile parking mechanism directly influences parking safety, so that the function of accurately detecting the parking mechanism when a transmission is off line is required, and the problem parts are prevented from flowing into the market.
Disclosure of Invention
The invention provides an offline detection method and device for an automobile parking mechanism, and solves the technical problems that in the prior art, the parking mechanism is low in detection accuracy and poor in consistency, potential safety hazards exist, user experience is poor and the like.
The off-line detection method for the automobile parking mechanism is characterized by comprising the following steps of:
controlling a motor to drive a driving end of a double-clutch transmission to drive a driven end to rotate, wherein the driven end comprises an output shaft;
and controlling a shifting fork of the double-clutch transmission to be engaged into a target gear.
Adjusting the real-time rotating speed of the output shaft to a first target rotating speed;
controlling a parking mechanism to brake the driven end, and acquiring a parking angle of the parking mechanism when the rotating speed of the output shaft is reduced to zero;
acquiring a parking time length corresponding to the time when the rotating speed of the output shaft is kept to be zero, controlling the parking mechanism to release the brake of the driven end, and acquiring a parking releasing angle of the parking mechanism when the driven end completely releases the brake;
and obtaining a test result of the parking mechanism according to parking parameters, wherein the parking parameters comprise the parking angle, the parking time length and the parking releasing angle.
Optionally, the obtaining a test result of the parking mechanism according to the parking parameter includes:
when the parking parameters of the parking mechanism are confirmed to meet all conditions in preset test requirements, the test result is confirmed to be qualified; the preset test requirements include the following conditions:
the parking time length is greater than or equal to a preset time length;
the parking angle is within a first preset angle range;
the park release angle is within a second preset angle range.
Optionally, the obtaining of the parking release angle of the parking mechanism when the driven end is completely released from braking further includes: and acquiring the parking releasing rotating speed of the driven end when the driven end completely releases the brake.
Optionally, the parking parameter further comprises the parking release rotational speed;
the preset test requirements further include the following conditions:
and the absolute value of the difference value between the parking releasing rotating speed and the first target rotating speed is smaller than or equal to a preset differential threshold value.
Optionally, after the control of the shift fork of the wet dual clutch transmission to engage in the target gear, the method further includes:
adjusting the real-time rotating speed of the output shaft of the double-clutch transmission to a second target rotating speed; wherein the second target rotational speed is greater than the first target rotational speed;
and controlling the parking mechanism to continuously brake the driven end, and acquiring the critical rotating speed when the real-time rotating speed of the output shaft starts to drop sharply in the continuous braking process of the driven end.
Optionally, the parking parameter further comprises the critical rotation speed;
the preset test requirements further include the following conditions:
the critical rotating speed is less than a preset target critical rotating speed; the preset critical target rotating speed is less than the second target rotating speed, and the preset critical target rotating speed is greater than the first target rotating speed.
Optionally, the first preset angle range is: 9.8-12.8 degrees;
the second preset angle range is 27.8-30.8 degrees;
the preset duration ranges from 30 seconds to 60 seconds.
Optionally, adjusting the real-time rotation speed of the driven end to a first target rotation speed includes:
acquiring a first target rotating speed through a preset rotating speed conversion model; the preset rotating speed conversion model is as follows:
wherein n is a first target rotational speed of the output shaft; v is the automobile speed; r is a preset wheel radius;
and acquiring the real-time rotating speed of the output shaft through an output rotating speed sensor arranged on the output shaft, and adjusting the real-time rotating speed of the output shaft to the first target rotating speed through the rack motor.
Optionally, before the driving end of the console motor-driven dual clutch transmission drives the driven end to rotate, the method further includes:
controlling all clutches in the dual clutch transmission to open;
controlling all shifting forks in the double-clutch transmission to be in neutral;
controlling the parking mechanism to be in an unlocking state;
and injecting lubricating oil with preset cooling and lubricating flow into the dual-clutch transmission.
The invention also provides an offline detection device of the automobile parking mechanism, which comprises a rack motor, a double-clutch transmission, a parking mechanism and a transmission control unit for connecting the double-clutch transmission and the parking mechanism; the rack motor is connected with the driving end of the double-clutch transmission, and the parking mechanism is indirectly connected with the driven end of the double-clutch transmission;
the transmission control unit is used for executing the automobile parking mechanism offline detection method.
According to the double-clutch transmission, the rack motor drives the driving end of the double-clutch transmission to drive the driven end to rotate, the shifting fork of the double-clutch transmission is controlled to be connected into a preset gear, and the driven end drives the output end of the double clutch to rotate; after the rack motor adjusts the rotating speed of the output shaft to a first target rotating speed; controlling the parking mechanism to brake the driven end, and acquiring a parking angle of the parking mechanism when the rotating speed of the output shaft is reduced to zero, and a corresponding parking duration when the rotating speed of the output shaft is maintained to be zero; controlling the parking mechanism to release the brake on the driven end, and obtaining a parking releasing angle of the parking mechanism when the output shaft is completely released from the brake; and finally, confirming whether the parking mechanism is qualified or not through the parking angle, the parking time length and the parking releasing angle. Therefore, the off-line detection method of the automobile parking mechanism utilizes the drag torque of the double-clutch transmission, does not need a specific rack load motor, and is simple, convenient to operate and few in required equipment; meanwhile, the detection method integrates the parking angle, the parking time length and the parking releasing angle, so that the detection structure is more accurate, and by offline detection, the problem parts are prevented from flowing into the market, and the safety and the user experience of the automobile are improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a flowchart of an offline detection method for a parking mechanism of an automobile according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an offline detection device of a parking mechanism of an automobile according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an offline detection device of a parking mechanism of an automobile according to another embodiment of the present invention;
fig. 4 is a curve of the driven end rotation speed and the angle of the parking mechanism changing with time according to the offline detection method for the parking mechanism of the automobile provided by the embodiment of the invention.
The reference numerals in the specification are as follows:
1. a gantry motor; 2. a wet dual clutch transmission; 3. a parking mechanism; 4. a transmission control unit; 5. a first communication device; 6. a second communication device; 7. and a data processing terminal.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, a method for detecting an offline state of a parking mechanism of an automobile according to an embodiment of the present invention includes:
s10, driving ends of the double-clutch transmission 2 are driven by the control stand motor 1 to drive driven ends to rotate, and the driven ends comprise output shafts; the driven end is indirectly connected with a parking mechanism 3 (after a fixed gear is hung, the parking mechanism 3 is connected with the driven end through an output shaft of the double-clutch transmission 2); preferably, the wet dual clutch transmission 2 is a wet dual clutch automatic transmission. As can be understood, because the driving end and the driven end of the wet dual clutch have relative rotation speed difference, the oil between the friction plate and the steel sheet in the wet dual clutch transmission will generate drag torque under the action of viscous shear due to the rotation speed difference, so that the driving end drives the driven end to rotate.
The parking mechanism 3 is a mechanism which needs to detect the performance of the parking mechanism, the driving mode of the parking mechanism 3 can be mechanical, hydraulic and electric, and the mechanical parking mechanism 3 completes the braking function of the automobile by manually driving a gear shifting handle or driving a gear shifting assembly; the hydraulic parking mechanism 3 controls a parking electromagnetic valve by the transmission control unit 4 to drive a parking hydraulic execution module so as to complete the braking function of the automobile; the electric parking mechanism 3 drives a parking execution assembly to complete the automobile braking function; the off-line detection method for the automobile parking mechanism can detect the parking mechanisms 3 with the three driving modes, and improves the applicability of the off-line detection method for the automobile parking mechanism.
Further, in step S10, the driving end of the dual clutch transmission 2 is in the process of idling (at this time, the driving end does not drive the output shaft of the dual clutch transmission 2 to rotate), that is, it is required to ensure that all clutches of the dual clutch transmission 2 are opened, and the shift fork is engaged in the neutral position.
S20, controlling a shifting fork of the double-clutch transmission 2 to be engaged into a target gear, and adjusting the real-time rotating speed of the output shaft to a first target rotating speed; the driven end drives an output shaft of the wet double clutch to rotate; it is understood that the target gear includes all gears of the dual clutch transmission 2, i.e., from neutral to a target gear, such as 1 gear or 2 gear, etc. After the shifting fork is hung in a target gear, the rack motor 1 drives the shifting fork, and the driving end can drive the output shaft to obtain an expected rotating speed through the driven end.
In one embodiment, the step S20 includes:
acquiring a first target rotating speed through a preset rotating speed conversion model; the preset rotating speed conversion model is as follows:
wherein n is a first target rotational speed (unit: rpm) of the output shaft; v is a first target automobile speed, namely a first target wheel linear speed (unit: km/h) of the automobile wheel; r is a preset wheel radius (unit: m).
The real-time rotating speed of the output shaft is obtained through an output rotating speed sensor installed on the output shaft, and the real-time rotating speed of the output shaft is adjusted to the first target rotating speed through the rack motor 1. It is understood that the gantry motor 1 drives the driving end and the driven end to rotate the real-time rotation speed of the output shaft to the first target rotation speed.
In this embodiment, the preset rotation speed conversion model may derive the first target rotation speed according to the vehicle speed (i.e., the first target rotation speed of the output shaft is associated with the vehicle speed), so that the offline detection method of the vehicle parking mechanism is more suitable for practical application, and the detection structure is more accurate.
In another embodiment, the rotation speed of the output shaft of the dual clutch transmission 2 is measured by a rotation speed sensor detecting the driven end of the clutch; it is understood that, in the present invention, the rotation speed of the output shaft may be replaced by the rotation speed of the clutch driven end, and the rotation speed of the output shaft is obtained by converting the gear ratio of the gears engaged in the dual clutch transmission 2.
S30, controlling the parking mechanism 3 to brake the driven end, and acquiring the parking angle of the parking mechanism 3 when the rotating speed of the output shaft is reduced to zero; as can be understood, the parking mechanism 3 comprises a parking pawl and a parking gear installed on the output shaft, and after receiving a parking instruction, the parking pawl is engaged with the parking gear, and the parking mechanism 3 brakes the driven end; and the parking angle may be automatically measured by a position sensor installed in the parking mechanism 3.
S40, acquiring a corresponding parking time length when the rotating speed of the output shaft is kept to be zero, controlling the parking mechanism 3 to release the brake of the driven end, and acquiring a parking releasing angle of the parking mechanism 3 when the driven end completely releases the brake; as will be appreciated, when a parking release command is received, the parking pawl is disengaged from the parking gear, the parking mechanism 3 releases the braking function to the driven end, and the output shaft will return to the rotation speed before braking; and the de-parking angle may be automatically measured by an angle sensor in the parking mechanism 3.
And S50, obtaining a test result of the parking mechanism 3 according to parking parameters, wherein the parking parameters comprise the parking angle, the parking time length and the parking releasing angle.
Further, as shown in fig. 4 (in fig. 4, a curve a of the rotation speed of the driven end changing with time, and a curve b of the angle of the parking mechanism 3 changing with time, c is a first preset angle range, and d is a second preset angle range), the step S60, that is, the obtaining of the test result of the parking mechanism 3 according to the parking parameter, includes:
when the parking parameters of the parking mechanism 3 are confirmed to meet all conditions in the preset test requirements, the test result is confirmed to be qualified; the preset test requirements include the following conditions:
the parking time length is greater than or equal to a preset time length; preferably, the preset time is 30-60 seconds. It is understood that the preset time period includes, but is not limited to, 30 seconds to 60 seconds, for example, the preset time period may also be set to 20 seconds, 80 seconds, 90 seconds, etc.; i.e. after the parking mechanism 3 brakes the driven end, it is necessary to ensure that the rotation speed of the driven end is maintained at 0rpm for a period of time.
The parking angle is within a first preset angle range; preferably, the first preset angle is 9.8-12.8 degrees; for example, the parking angle is 9.8 degrees, 11.3 degrees, 12.8 degrees, etc., the preset test requirements are met. It is understood that the first preset angle range may also be set to other values according to the actual situation, for example, the first preset angle range is 7 degrees to 15 degrees.
The parking releasing angle is within a second preset angle range; preferably, the second preset angle range is 27.8-30.8 degrees; for example, the parking release angle is 27.8 degrees, 29.3 degrees, 30.8 degrees, etc., the predetermined test requirement is met. It is understood that the second preset angle range may also be set to other values according to the actual situation, for example, the second preset angle range is 25 degrees to 35 degrees.
In the invention, when the parking time, the parking angle and the parking releasing angle measured by the offline detection method of the automobile parking mechanism 3 respectively meet three conditions of the preset test requirements, the detected parking function of the parking mechanism 3 is qualified.
Optionally, the step S50, namely the obtaining of the test result of the parking mechanism 3 according to the parking parameter, further includes:
and when the parking parameters of the parking mechanism 3 are confirmed not to meet any one or more conditions of the preset test requirements, confirming that the test result is unqualified. That is, when one or more of the parking time length, the parking angle, and the parking release angle do not satisfy the preset test requirement, it is determined that the function of the parking mechanism 3 is not qualified. Specifically, when the parking period is less than a preset period (i.e., the output shaft cannot be maintained at 0rpm after the parking mechanism 3 brakes the driven end), it may be that the parking function of the parking mechanism 3 is failed, and the parking mechanism 3 is determined to be unqualified; when the parking angle is not within the first preset angle range, the position sensor in the parking mechanism 3 may be abnormal, or the parking function of the parking mechanism 3 may be abnormal, and the parking mechanism 3 is determined to be unqualified; when the contact parking angle is not within the second preset angle range, it may be that a position sensor in the parking mechanism 3 is abnormal, or that a parking function of the parking mechanism 3 is abnormal, and it is determined that the parking mechanism 3 is not qualified.
According to the invention, the rack motor 1 drives the driving end of the double-clutch transmission 2 to drive the driven end to rotate, and controls the shifting fork of the double-clutch transmission 2 to be engaged into a preset gear, and the driven end drives the output shaft of the wet double clutch to rotate; after the rotating speed of the output shaft is adjusted to a first target rotating speed by the rack motor 1; controlling the parking mechanism 3 to brake the driven end, and acquiring a parking angle of the parking mechanism 3 when the rotating speed of the output shaft is reduced to zero, and a corresponding parking duration when the rotating speed of the output shaft is kept to be zero; controlling the parking mechanism 3 to release the brake on the driven end, and acquiring a parking releasing angle of the parking mechanism 3 when the driven end completely releases the brake; and finally, confirming whether the parking mechanism 3 is qualified or not through the parking angle, the parking time length and the parking releasing angle. Therefore, in the invention, the off-line detection method of the automobile parking mechanism utilizes the drag torque of the double-clutch transmission 2, a specific rack load motor is not needed, the detection method is simple, the operation is convenient, and the required equipment is less; meanwhile, the detection method integrates the parking angle, the parking time length and the parking releasing angle, so that the detection structure is more accurate, and by offline detection, the problem parts are prevented from flowing into the market, and the safety and the user experience of the automobile are improved.
In one embodiment, the step S40 of obtaining a parking release angle of the parking mechanism when the driven end is completely released from braking further includes: and acquiring the parking releasing rotating speed of the output shaft when the driven end completely releases the brake. It is understood that, after the parking mechanism 3 releases the braking of the driven end, the rotation speed of the output shaft is quickly restored to the rotation speed before the braking.
Further, the step S50 is executed, that is, the parking parameter further includes the parking release rotation speed;
the preset test requirements further include the following conditions:
and the absolute value of the difference value between the parking releasing rotating speed and the first target rotating speed is smaller than or equal to a preset differential threshold value. Preferably, the preset difference threshold has a value range as follows: 0 to 10 rpm. It can be understood that the value range of the preset difference threshold includes, but is not limited to, 0 to 10rpm, for example, the value range of the preset difference threshold may also be 0 to 15rpm, and the like.
Specifically, the parking mechanism 3 is determined to be qualified only when the parking time length is greater than or equal to a preset time length, the parking angle is within a first preset angle range, the parking releasing angle is within a second preset angle range, and an absolute value of a difference value between the parking releasing rotating speed and the first target rotating speed is less than or equal to a preset differential threshold value; and when one or more of the four factors do not meet the corresponding judgment conditions, determining that the parking mechanism 4 is unqualified.
When the parking-release rotating speed is greater than a preset differential threshold (that is, the parking mechanism 3 releases the brake on the driven end, and the output shaft cannot return to the rotating speed before the brake), the parking function of the parking mechanism 3 may fail, and at this time, it may be determined that the parking mechanism 3 is not qualified. According to the invention, the parking releasing rotating speed is brought into the parking parameters, so that the accuracy of the off-line detection method for the parking structure of the automobile parking mechanism on the detection structure of the parking structure is further improved.
In an embodiment, after the step S20, that is, after the step of controlling the shift fork of the dual clutch transmission to engage in the target gear, the method further includes:
adjusting the real-time rotating speed of the output shaft of the double-clutch transmission 2 to a second target rotating speed; wherein the second target rotational speed is greater than the first target rotational speed; understandably, the second target rotating speed is obtained by deducing the second target automobile speed through the preset rotating speed conversion model; preferably, the second target vehicle speed is 10Km/h, and it is understood that the second target vehicle speed may be set to 15Km/h, 20Km/h, or the like.
And receiving a continuous parking instruction, controlling the parking mechanism 3 to continuously brake the driven end, and acquiring the critical rotating speed when the real-time rotating speed of the output shaft starts to sharply drop in the continuous braking process of the driven end. It is understood that when the rotation speed of the output shaft reaches the second target rotation speed, the parking mechanism 3 starts to continuously brake the driven end, that is, the parking pawl of the parking mechanism 3 contacts the parking gear of the parking mechanism 3, the parking pawl cannot be kept engaged with the parking gear due to the fact that the rotation speed of the parking gear follows the driven end is fast, and when the rotation speed of the output shaft slowly decreases due to the effect of the parking pawl on the parking gear; when the rotation speed of the output shaft drops to the threshold rotation speed, the parking pawl will engage with the parking gear, at which time the rotation speed of the output shaft will drop rapidly to zero.
In an embodiment, in step S50, that is, the parking parameter further includes the critical rotation speed;
the preset test requirements further include the following conditions:
the critical rotating speed is less than a preset target critical rotating speed; the preset critical target rotating speed is less than the second target rotating speed, and the preset critical target rotating speed is greater than the first target rotating speed. It is understood that the preset threshold rotational speed is obtained by the preset rotational speed conversion model according to the preset threshold vehicle speed. Preferably, the preset critical vehicle speed is 7Km/h, and it is understood that the preset critical vehicle speed includes, but is not limited to, 7Km/h, and the preset critical vehicle speed may also be set to 6Km/h, 8Km/h, and the like according to actual requirements.
Specifically, the parking mechanism 3 is determined to be qualified only when the parking time length is greater than or equal to a preset time length, the parking angle is within a first preset angle range, the parking releasing angle is within a second preset angle range, an absolute value of a difference value between the parking releasing rotational speed and the first target rotational speed is less than or equal to a preset differential threshold value, and the critical rotational speed is greater than or equal to the preset target critical rotational speed. When one or more of the five factors do not meet the corresponding judgment condition, the parking mechanism 3 is determined to be unqualified; and when the critical rotating speed is greater than or equal to the preset target critical rotating speed, the parking function of the parking mechanism 3 may be abnormal, and the parking mechanism 3 is determined to be unqualified.
In the invention, the critical rotating speed is brought into the parking parameter, so that the accuracy of the detection result of the offline detection method of the automobile parking mechanism 3 is further improved.
In an embodiment, before step S10, that is, before the console motor 1 drives the driving end of the dual clutch transmission 2 to rotate the driven end, the method further includes:
controlling all clutches in the dual clutch transmission 2 to be open; namely, the two clutches of the dual clutch transmission 2 are controlled to be opened, and at the moment, the rack motor 1 drives the driving end to drive the driven end to rotate.
All shifting forks in the double-clutch transmission 2 are controlled to be in neutral; it can be understood that the shifting forks are all in neutral, and the driven end can not drive the output shaft of the wet type double-clutch automatic transmission to rotate.
Controlling the parking mechanism 3 to be in an unlocking state; at this time, it is necessary to ensure that the parking mechanism 3 is in the unlocked state so that the shift fork of the dual clutch transmission 2 is engaged in the target gear corresponding to the target gear information.
And lubricating oil with preset cooling and lubricating flow is injected into the dual clutch transmission 2. It can be understood that, in order to make the driving end drive the driven end to rotate, lubricating oil with preset cooling and lubricating flow needs to be injected into the dual clutch transmission 2. It should be noted that, the sequence of the above steps in this embodiment is not limited, and may be changed according to the requirement.
As shown in fig. 2, an embodiment of the present invention further provides an offline detection device for a parking mechanism 3 of an automobile, which includes a rack motor 1, a dual clutch transmission 2, a parking mechanism 3, and a transmission control unit 4 connecting the dual clutch transmission 2 and the parking mechanism 3; the rack motor 1 is connected with the driving end of the double-clutch transmission 2, and the parking mechanism 3 is indirectly connected with the driven end of the double-clutch transmission 2; it is understood that the transmission control unit 4 may control the dual clutch transmission 2 and the parking mechanism 3, and may receive signals fed back by the dual clutch transmission 2 and the parking mechanism 3.
The transmission control unit 4 is configured to execute the above-mentioned offline detection method for the parking mechanism 3 of the vehicle. In the invention, the off-line detection device of the automobile parking mechanism 3 has simple structure and convenient installation and operation; meanwhile, the parking mechanism 3 can be accurately detected by an offline detection method, so that the problem parts are prevented from flowing into the market, and the safety and the user experience of the automobile are improved.
In an embodiment, as shown in fig. 3, the offline detection apparatus for the parking mechanism 3 further includes a first communication device 5, a second communication device 6 and a data processing terminal 7; the data processing terminal 7 is connected with the gantry motor 1 through the first communication device 5, and the data processing terminal 7 is connected with the transmission control unit 4 through the second communication device 6. It can be understood that the data processing terminal 7 can control the gantry motor 1 and the signals fed back by the gantry motor 1 through the first communication device 5; the data processing terminal 7 can control the transmission processing unit through the second communication device 6 and receive signals fed back by the controller processing unit, so as to drive the dual clutch transmission 2 to operate, and display the signals fed back by the dual clutch transmission 2 on a display screen thereof. Further, the data processing terminal 7 includes, but is not limited to, a computer, a tablet computer, and other terminal devices.
Specifically, the inspector can control the operation of the gantry motor 1 through the data processing terminal 7, control the dual clutch transmission 2 to perform operations such as gear engaging, shifting fork engaging and the like through the data processing terminal 7, and control the parking mechanism 3 to brake the driven end through the data processing terminal 7. Further, the inspector can input the detection instruction, the parking releasing instruction, the first target rotating speed, the second target rotating speed, the preset time length, the first preset angle, the second preset angle, the preset differential threshold value, the preset critical target rotating speed and the like into the data processing terminal 7, so that the data processing terminal 7 automatically controls and finishes the detection structure of the parking mechanism 3, the workload of the inspector is reduced, and the accuracy of the test result is guaranteed.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The offline detection method for the automobile parking mechanism is characterized by comprising the following steps:
controlling a motor to drive a driving end of a double-clutch transmission to drive a driven end to rotate, wherein the driven end comprises an output shaft;
controlling a shifting fork of the double-clutch transmission to be engaged into a target gear; adjusting the real-time rotating speed of the output shaft to a first target rotating speed;
controlling a parking mechanism to brake the driven end, and acquiring a parking angle of the parking mechanism when the rotating speed of the output shaft is reduced to zero;
acquiring a parking time length corresponding to the time when the rotating speed of the output shaft is kept to be zero, controlling the parking mechanism to release the brake of the driven end, and acquiring a parking releasing angle of the parking mechanism when the driven end completely releases the brake;
and obtaining a test result of the parking mechanism according to parking parameters, wherein the parking parameters comprise the parking angle, the parking time length and the parking releasing angle.
2. The offline detection method for the parking mechanism of the automobile according to claim 1, wherein the obtaining of the test result of the parking mechanism according to the parking parameters comprises:
when the parking parameters of the parking mechanism are confirmed to meet all conditions in preset test requirements, the test result is confirmed to be qualified; the preset test requirements include the following conditions:
the parking time length is greater than or equal to a preset time length;
the parking angle is within a first preset angle range;
the park release angle is within a second preset angle range.
3. The offline detection method for the parking mechanism of the automobile according to claim 2, wherein the obtaining of the parking release angle of the parking mechanism when the driven end is completely released from braking further comprises: and acquiring the parking releasing rotating speed of the driven end when the driven end completely releases the brake.
4. The offline detection method for the parking mechanism of the automobile according to claim 3, wherein the parking parameters further comprise the parking release rotating speed;
the preset test requirements further include the following conditions:
and the absolute value of the difference value between the parking releasing rotating speed and the first target rotating speed is smaller than or equal to a preset differential threshold value.
5. An offline detection method for a parking mechanism of an automobile according to claim 2, wherein after controlling a shifting fork of the dual clutch transmission to be engaged into a target gear, the method further comprises the following steps:
adjusting the real-time rotating speed of the output shaft of the double-clutch transmission to a second target rotating speed; wherein the second target rotational speed is greater than the first target rotational speed;
and controlling the parking mechanism to continuously brake the driven end, and acquiring the critical rotating speed when the real-time rotating speed of the output shaft starts to drop sharply in the continuous braking process of the driven end.
6. The offline detection method for the parking mechanism of the automobile according to claim 5, wherein the parking parameters further comprise the critical rotation speed;
the preset test requirements further include the following conditions:
the critical rotating speed is less than a preset target critical rotating speed; the preset critical target rotating speed is less than the second target rotating speed, and the preset critical target rotating speed is greater than the first target rotating speed.
7. The offline detection method for the parking mechanism of the automobile according to claim 2, wherein the first preset angle range is as follows: 9.8-12.8 degrees;
the second preset angle range is 27.8-30.8 degrees;
the preset duration ranges from 30 seconds to 60 seconds.
8. An off-line detection method for the parking mechanism of the automobile according to claim 1, wherein the adjusting the real-time rotation speed of the output shaft to the first target rotation speed comprises:
acquiring a first target rotating speed through a preset rotating speed conversion model; the preset rotating speed conversion model is as follows:
wherein n is a first target rotational speed of the output shaft; v is the speed of the automobile; r is a preset wheel radius;
and acquiring the real-time rotating speed of the output shaft through an output rotating speed sensor arranged on the output shaft, and adjusting the real-time rotating speed of the output shaft to the first target rotating speed through the motor.
9. An offline detection method for a parking mechanism of an automobile according to claim 1, wherein before controlling the motor to drive the driving end of the dual clutch transmission to drive the driven end to rotate, the method further comprises:
controlling all clutches in the dual clutch transmission to open;
controlling all shifting forks in the double-clutch transmission to be in neutral;
controlling the parking mechanism to be in an unlocking state;
and injecting lubricating oil with preset cooling and lubricating flow into the dual-clutch transmission.
10. The offline detection device for the automobile parking mechanism is characterized by comprising a rack motor, a double-clutch transmission, a parking mechanism and a transmission control unit for connecting the double-clutch transmission and the parking mechanism; the rack motor is connected with the driving end of the double-clutch transmission, and the parking mechanism is connected with the driven end of the double-clutch transmission;
the transmission control unit is used for executing the offline detection method of the parking mechanism of the automobile according to any one of claims 1 to 9.
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