CN111775626A - Lubrication control method for rear axle brake of high-horsepower HMCVT tractor - Google Patents
Lubrication control method for rear axle brake of high-horsepower HMCVT tractor Download PDFInfo
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- CN111775626A CN111775626A CN202010581374.2A CN202010581374A CN111775626A CN 111775626 A CN111775626 A CN 111775626A CN 202010581374 A CN202010581374 A CN 202010581374A CN 111775626 A CN111775626 A CN 111775626A
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- brake
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- braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R17/00—Arrangements or adaptations of lubricating systems or devices
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Abstract
The invention discloses a lubrication control method for rear axle braking of a high-horsepower HMCVT tractor, and belongs to the field of lubrication control. According to the lubrication control method for the rear axle brake of the high-horsepower HMCVT tractor, when the condition that the speed of a vehicle after a brake pedal is released or the vehicle is directly braked is less than or equal to the minimum brake lubrication limiting speed occurs after a brake lubrication command is sent out, at the moment, the acting time of lubricating oil on a hydraulic disc brake cannot be guaranteed, so that the cooling effect cannot be achieved, the command delay is carried out by introducing the current delay time, a lubricating channel is continuously conducted, and the lubricating oil continues to carry out cooling lubrication on the hydraulic disc brake during the command delay until the delay time is over; in the vehicle braking process, the process is repeated, the lubricating and cooling effects of the hydraulic disc brake can be guaranteed, and lubricating oil is not wasted.
Description
Technical Field
The invention belongs to the field of lubrication control, and particularly relates to a lubrication control method for rear axle braking of a high-horsepower HMCVT tractor.
Background
A tractor with a high-horsepower mechanical-hydraulic power split continuously variable transmission (HMCVT) has the characteristics of high speed and high power, and the design of a cooling and lubricating control method for a rear axle hydraulic sheet brake is particularly important in the driving and braking process. When the brake lubrication is not controlled reasonably, the brake lubrication is poor, the dragging loss of the hydraulic plate type brake is large, and the oil consumption is high.
Disclosure of Invention
The invention aims to overcome the defect that the lubrication control of the rear axle brake of the existing high-horsepower HMCVT tractor is unreasonable, and provides a lubrication control method of the rear axle brake of the high-horsepower HMCVT tractor.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a lubrication control method for rear axle braking of a high-horsepower HMCVT tractor comprises the following steps:
1) when the vehicle runs, detecting whether a service braking signal or a steering braking signal exists;
2) if a service braking signal or a steering braking signal is detected, turning to the step 3);
3) judging the current vehicle speed and the minimum limit speed of brake lubrication;
if the current actual vehicle speed is greater than the minimum brake lubrication limiting speed, a brake lubrication command signal is sent out, the electromagnetic valve is electrified, and the brake lubrication oil way is conducted;
otherwise, not sending out a brake lubrication command signal;
4) if the brake signal is released or the vehicle speed is less than or equal to the minimum brake lubrication limiting speed after the brake lubrication command is sent, correspondingly delaying the brake lubrication command signal according to the brake lubrication command delay time, and continuing to conduct the lubrication oil way until the delay time is over;
the brake lubrication command delay time is obtained through calculation;
5) after the delay time is over, repeating the steps 2) -4).
Further, the calculation process of the brake lubrication command delay time in the step 4) is as follows:
collecting left service brake pressure and right service brake pressure through a pressure sensor;
the rotating speed sensor acquires the rotating speed of a wheel shaft of the transmission shaft;
calculating the obtained signals to obtain left driving braking power and right driving braking power;
and obtaining braking power by utilizing a larger value of the left driving braking power and the right driving braking power through integral calculation, and obtaining corresponding braking lubrication command delay time through the relation between the braking power and the braking lubrication command delay time.
Further, the braking power is equal to the product of the actual transmission shaft wheel axle rotating speed and the braking pressure and then multiplied by a service braking heating energy calculation coefficient;
when a braking signal exists, the braking work is the integral summation of a plurality of sampling periods of the braking power;
the sampling period is 0.01s, and the braking power value range is 0-10000J;
the mathematical relationship between the brake work and the brake lubrication command delay time is obtained from empirical values, with brake work as abscissa in J and brake lubrication command delay time as ordinate in s, and two lines are determined by three coordinate points, which are (0,0), (2000,20), (10000,120), respectively.
Further, the conduction and the cut-off of the lubricating oil way in the step 4) are executed by a switching value electromagnetic valve;
when the switching value electromagnetic valve is not electrified, the lubricating oil way is cut off;
when the switching value electromagnetic valve is electrified, the lubricating oil path is conducted.
Further, when the switching value electromagnetic valve is electrified, the state of the switching value electromagnetic valve is detected;
and if the switching value electromagnetic valve has a fault, resetting the fault.
Compared with the prior art, the invention has the following beneficial effects:
according to the lubrication control method for the rear axle brake of the high-horsepower HMCVT tractor, when the brake pedal is released or the speed of the braked vehicle is less than or equal to the minimum brake lubrication limiting speed after the brake lubrication command is sent out, at the moment, the acting time of lubricating oil on a hydraulic disc brake cannot be guaranteed, so that the cooling effect cannot be achieved, the command delay is carried out by introducing the current delay time, the lubrication channel is continuously conducted, and the lubricating oil continues to carry out cooling and lubrication on the hydraulic disc brake during the command delay time until the delay time is over; in the vehicle braking process, the process is repeated, the lubricating and cooling effects of the hydraulic disc brake can be guaranteed, and lubricating oil is not wasted.
Furthermore, by detecting the state of the electromagnetic valve, the electromagnetic valve is ensured to have no fault when the control current activates the electromagnetic valve, and the safety of the electromagnetic valve during operation is ensured.
Drawings
FIG. 1 is a control diagram of the brake lubrication command delay time logic of the present invention;
FIG. 2 is a control diagram of the brake lubrication command logic of the present invention;
FIG. 3 is a logic control diagram of the solenoid fault status command of the present invention;
FIG. 4 is a logic control diagram of whether the brake lube valve of the present invention is activated.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a logic control diagram of brake lubrication command delay time of the present invention, a pressure sensor acquires left-side service brake pressure and right-side service brake pressure, a rotation speed sensor acquires actual transmission shaft axle rotation speed, the data are processed and calculated to obtain left-side service brake power and right-side service brake power, the brake power is equal to the product of the actual transmission shaft axle rotation speed and the brake pressure, and then multiplied by a service brake heating energy calculation coefficient, and the coefficient is a fixed value 1. The method comprises the steps of taking the larger power of the driving braking power on the left side and the right side, and carrying out integral summation on the braking power for a plurality of sampling periods to obtain braking power when a braking signal exists, wherein the sampling period is a fixed value of 0.01 s. The braking power range is limited to 0-10000J. Then, the brake lubrication command delay time corresponding to the brake work is obtained by a table look-up, which is obtained from empirical values, and two segment lines are determined by three coordinate points, i.e., (0,0), (2000,20), (10000,120), wherein the abscissa is the brake work and is in J, and the ordinate is the brake lubrication command delay time and is in s.
Referring to fig. 2, fig. 2 is a logic control diagram of a brake lubrication command according to the present invention, which detects whether there is a service brake signal or a steering brake signal when a vehicle is running; if the brake signal is not detected, judging whether the current actual vehicle speed is greater than the minimum brake lubrication limiting speed or not, and setting the logic value of a brake lubrication command to be 0; otherwise, judging whether the current actual vehicle speed is greater than the brake lubrication minimum limit speed or not, and if the current actual vehicle speed is greater than the brake lubrication minimum limit speed, sending a brake lubrication command signal with a command logic value of 1; and if the actual vehicle speed is less than or equal to the minimum brake lubrication limiting speed, setting the logic value of the brake lubrication command to be 0.
When the vehicle speed after the brake lubrication command is sent and the brake is released or the direct brake is less than or equal to the minimum brake lubrication limiting speed, the brake lubrication command is delayed by calculating the delay time, and after the delay time is finished, the detection and judgment processes are repeated to update the logic value of the brake lubrication command; the lubricating and cooling effect of the hydraulic disc brake is optimal, and unnecessary consumption of lubricating oil is reduced.
When the switching value solenoid valve is activated, it is necessary to detect and diagnose a failure state of the solenoid valve. Referring to FIG. 3, FIG. 3 is a logic control diagram of the solenoid valve fault status command of the present invention; the electromagnetic valve states are generally three, specifically, the electromagnetic valve is open to ground/electricity, the electromagnetic valve is short to ground/electricity, and no fault exists. When the solenoid valve is short-circuited, the logic value is set to 0, and the solenoid valve needs to be subjected to fault resetting. Similarly, when the solenoid valve is open, the logic value is also set to 0, and the solenoid valve needs to be reset. The fault reset success logic value is set to 1, otherwise the logic value is still set to 0. The non-failure logic value is set to 1. By judging the state of the electromagnetic valve, the electromagnetic valve is ensured to have no fault when the control current activates the electromagnetic valve, and the electromagnetic valve is a safety guarantee when the electromagnetic valve works.
Referring to fig. 4, fig. 4 is a logic control diagram for controlling whether the brake lubrication valve is activated according to the present invention, where there are two brake lubrication command signals, and when the brake lubrication command signal or the bench test brake lubrication command signal is input and the fault state signal is diagnosed as no fault, the control current activates the brake lubrication solenoid valve, so as to conduct the brake lubrication oil path. The brake lubrication command signal of the bench test is mainly used for the bench test, and the performance test of the brake lubrication electromagnetic valve is carried out by sending a command.
Examples
1. When a tractor of the high-horsepower mechanical hydraulic power split continuously variable transmission is started, the instrument panel can display fault state information, and if the whole tractor has no fault, the state of the lubricating electromagnetic valve is normal, and the tractor is started.
2. When the tractor carries out field cultivation, a driver steps on a brake pedal when the tractor runs (the left brake pedal and the right brake pedal are respectively stepped on to carry out steering braking and simultaneously stepped on to carry out service braking), at the moment, a control unit judges a vehicle speed signal and the brake signal, if the actual vehicle speed is more than the minimum speed limit of braking lubrication, the vehicle speed signal and the brake signal are logically AND-ed, the logical value is 1, the control unit sends out a braking lubrication command signal, the electromagnetic valve supplies power, the lubricating oil circuit is conducted, and the lubricating oil liquid cools and lubricates the hydraulic disc brake.
3. If the driver releases the brake pedal suddenly, and there is no brake lubrication command signal when the brake signal is released or the vehicle speed after direct braking is less than or equal to the minimum brake lubrication limiting speed, at this time, the hydraulic disc brake does not necessarily achieve the cooling effect, the brake lubrication command delay is carried out by obtaining the delay time through calculation, the electromagnetic valve continues to supply power during the period, the lubricating oil continues to carry out cooling lubrication on the hydraulic disc brake, and after the delay time is over, the current actual vehicle speed and the brake signal are judged again, and the brake lubrication command is updated.
4. If no braking signal is detected, the logic value of the braking and lubricating command is 0, no braking and lubricating command is sent, the electromagnetic valve is powered off, the current value is 0mA, and the lubricating oil way is closed;
if a braking signal is detected, and meanwhile, the current actual vehicle speed is greater than the minimum brake lubrication limiting speed, and the logic value of a brake lubrication command is 1, then a brake lubrication command is sent again, the electromagnetic valve supplies power, and the lubrication oil way is conducted;
if a braking signal is detected, and meanwhile, the current actual vehicle speed is less than or equal to the minimum limiting speed of braking lubrication, the logic value of a braking lubrication command is 0, the electromagnetic valve is powered off, the current value is 0mA, and a lubricating oil way is closed;
5. if the electromagnetic valve is damaged due to other factors in the field cultivation process, the electromagnetic valve is electrically opened or short-circuited to the ground, the brake lubrication command signal and the electromagnetic valve state signal are logically AND-ed, the logical value is 0, the brake lubrication electromagnetic valve is not powered, the lubrication oil way is not conducted, the instrument panel displays fault state information, and a driver is required to carry out fault maintenance.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. A lubrication control method for rear axle braking of a high-horsepower HMCVT tractor is characterized by comprising the following steps:
1) when the vehicle runs, detecting whether a service braking signal or a steering braking signal exists;
2) if a service braking signal or a steering braking signal is detected, turning to the step 3);
3) judging the current vehicle speed and the minimum limit speed of brake lubrication;
if the current actual vehicle speed is greater than the minimum brake lubrication limiting speed, a brake lubrication command signal is sent out, the electromagnetic valve is electrified, and the brake lubrication oil way is conducted;
otherwise, not sending out a brake lubrication command signal;
4) if the brake signal is released or the vehicle speed is less than or equal to the minimum brake lubrication limiting speed after the brake lubrication command is sent, correspondingly delaying the brake lubrication command signal according to the brake lubrication command delay time, and continuing to conduct the lubrication oil way until the delay time is over;
the brake lubrication command delay time is obtained through calculation;
5) after the delay time is over, repeating the steps 2) -4).
2. The lubrication control method for a rear axle brake of a high-horsepower HMCVT tractor according to claim 1, wherein the brake lubrication command delay time in step 4) is calculated by:
collecting left service brake pressure and right service brake pressure through a pressure sensor;
the rotating speed sensor acquires the rotating speed of a wheel shaft of the transmission shaft;
calculating the obtained signals to obtain left driving braking power and right driving braking power;
and obtaining braking power by utilizing a larger value of the left driving braking power and the right driving braking power through integral calculation, and obtaining corresponding braking lubrication command delay time through the relation between the braking power and the braking lubrication command delay time.
3. The lubrication control method for a high horsepower HMCVT tractor rear axle brake as in claim 2, wherein the brake power is equal to the product of actual driveshaft axle speed and brake pressure multiplied by a service brake heating energy calculation factor;
when a braking signal exists, the braking work is the integral summation of a plurality of sampling periods of the braking power;
the sampling period is 0.01s, and the braking power value range is 0-10000J;
the mathematical relationship between the braking work and the brake lubrication command delay time is as follows, taking the braking work as an abscissa and taking the unit as J, taking the brake lubrication command delay time as an ordinate and taking the unit as s, determining two lines through three coordinate points, and taking the three coordinate points as empirical values.
4. The lubrication control method for a rear axle brake of a high horsepower HMCVT tractor according to claim 3, wherein the three coordinate points are (0,0), (2000,20), (10000,120), respectively.
5. The lubrication control method for the rear axle brake of the high-horsepower HMCVT tractor according to claim 1, wherein the turning on and off of the lubrication oil path in step 4) is performed by a switching solenoid valve;
when the switching value electromagnetic valve is not electrified, the lubricating oil way is cut off;
when the switching value electromagnetic valve is electrified, the lubricating oil path is conducted.
6. The lubrication control method for a rear axle brake of a high-horsepower HMCVT tractor according to claim 1, wherein the state of the on-off solenoid valve is detected when the solenoid valve is energized;
and if the switching value electromagnetic valve has a fault, resetting the fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010581374.2A CN111775626A (en) | 2020-06-23 | 2020-06-23 | Lubrication control method for rear axle brake of high-horsepower HMCVT tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010581374.2A CN111775626A (en) | 2020-06-23 | 2020-06-23 | Lubrication control method for rear axle brake of high-horsepower HMCVT tractor |
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| Publication Number | Publication Date |
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| CN111775626A true CN111775626A (en) | 2020-10-16 |
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|---|---|---|---|
| CN202010581374.2A Pending CN111775626A (en) | 2020-06-23 | 2020-06-23 | Lubrication control method for rear axle brake of high-horsepower HMCVT tractor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4011022A1 (en) * | 1989-04-08 | 1990-10-11 | Zahnradfabrik Friedrichshafen | Drive axle joining transmission and wheel hub - uses circulating fluid to cool multi-plate brakes |
| CN102256840A (en) * | 2008-12-16 | 2011-11-23 | 株式会社小松制作所 | Brake device lubrication device and method for controlling same |
| CN105333040A (en) * | 2015-10-27 | 2016-02-17 | 贵州大学 | Intelligent cooling control device of vehicle wet brake and method of control device |
| CN106641210A (en) * | 2016-11-21 | 2017-05-10 | 陕西法士特齿轮有限责任公司 | Clutch/brake active lubrication control device and control method |
| CN207510232U (en) * | 2017-10-25 | 2018-06-19 | 中通客车控股股份有限公司 | A kind of efficient auxiliary braking system of integral new-energy passenger |
-
2020
- 2020-06-23 CN CN202010581374.2A patent/CN111775626A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4011022A1 (en) * | 1989-04-08 | 1990-10-11 | Zahnradfabrik Friedrichshafen | Drive axle joining transmission and wheel hub - uses circulating fluid to cool multi-plate brakes |
| CN102256840A (en) * | 2008-12-16 | 2011-11-23 | 株式会社小松制作所 | Brake device lubrication device and method for controlling same |
| CN105333040A (en) * | 2015-10-27 | 2016-02-17 | 贵州大学 | Intelligent cooling control device of vehicle wet brake and method of control device |
| CN106641210A (en) * | 2016-11-21 | 2017-05-10 | 陕西法士特齿轮有限责任公司 | Clutch/brake active lubrication control device and control method |
| CN207510232U (en) * | 2017-10-25 | 2018-06-19 | 中通客车控股股份有限公司 | A kind of efficient auxiliary braking system of integral new-energy passenger |
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Application publication date: 20201016 |
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