CN109469689B - Stepping motor type automobile clutch - Google Patents
Stepping motor type automobile clutch Download PDFInfo
- Publication number
- CN109469689B CN109469689B CN201811598458.6A CN201811598458A CN109469689B CN 109469689 B CN109469689 B CN 109469689B CN 201811598458 A CN201811598458 A CN 201811598458A CN 109469689 B CN109469689 B CN 109469689B
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- clutch
- valve
- stepping motor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D28/00—Electrically-actuated clutches
Abstract
The invention provides a stepping motor type automobile clutch, which is characterized in that a sensor and an electric control unit are additionally arranged on the basis of not changing a manual clutch executing mechanism, a control mechanism is changed into a stepping motor type pressure regulating valve, the intention of a driver and the state of a vehicle are fed back through the sensor, then the hydraulic pressure in the clutch executing mechanism is regulated according to the state required by the clutch, and further the engagement pressure of a clutch driving plate and a clutch torque transmission and the specific rotation speed of the clutch driving plate are controlled, so that the clutch is controlled. The clutch solves the problem of complicated power assisting of the traditional clutch, can remove the influence of clutch abrasion and fatigue deformation of the diaphragm spring on the torque transmission of the clutch, can effectively improve the working performance of the clutch by combining the intention of a driver and the running state of a vehicle, and can reduce the difficulty of clutch control and improve the control precision of the clutch.
Description
Technical Field
The present invention relates to a clutch device for an automobile, and more particularly to a stepping motor type automobile clutch using a stepping motor as a control unit.
Background
A clutch is a device that is involved in various vehicles, is installed between an engine and a transmission, is an assembly in a vehicle power train that is directly connected to the engine, and is a component that cuts off and transmits power between the engine and the vehicle power train.
The clutch transmits the maximum torque of the engine through clutch engagement, the transmission gear shifting is realized through complete separation, the clutch ensures that the automobile can start stably and the overload prevention of the transmission system is realized through the sliding friction of the driving part and the driven part of the clutch.
When quantitatively evaluating the starting process of the vehicle, the objective evaluation indexes mainly comprise clutch starting and engaging time, impact degree and specific slip grinding work. The clutch starting engagement time is the time spent from the time when the controller sends a starting command to the time when the clutch is completely engaged, and the good starting quality requires that the starting time is as short as possible on the basis of smooth starting; the impact degree is the derivative of the longitudinal acceleration of the vehicle with respect to time, the impact degree is in direct proportion to the change rate of the output torque, the faster the output torque changes, the larger the impact of the transmission system is, the impact degree better reflects the dynamics essence in the starting and shifting process, and the impact degree can truly reflect the state of the transmission system and the motion state of the vehicle in the starting and shifting process; the slip work of the clutch refers to how much mechanical energy is changed into heat energy during the clutch coupling process, which characterizes the severity of the friction surface wear of the clutch, and the specific slip work is the ratio of the slip work to the friction area of the clutch.
The friction clutch work control index is mainly embodied through the combination amount and the combination speed of the clutch, the friction clutch work control index has a great causal relation on the service life of the clutch, the combination amount and the combination speed of the clutch have high requirements on experience of a driver, and even the combination amount and the combination speed of the clutch directly influence the starting stability and gear shifting smoothness of a vehicle.
Disclosure of Invention
The invention provides a stepping motor type automobile clutch, which is characterized in that a sensor and an electric control unit are additionally arranged on the basis of not changing a manual clutch executing mechanism, a control mechanism is changed into a stepping motor type pressure regulating valve, the intention of a driver and the state of a vehicle are fed back through the sensor, then the hydraulic pressure in the clutch executing mechanism is regulated according to the state required by the clutch, and further the engagement pressure of a clutch driving plate and a clutch torque transmission and the specific rotation speed of the clutch driving plate are controlled, so that the clutch is controlled.
And the electronic control unit calculates data and then sends an instruction to the pressure regulating valve of the stepping motor to hydraulically regulate the clutch hydraulic separator so as to realize the control of the clutch.
The invention realizes the above purpose by adopting the following technical scheme:
a stepping motor type automobile clutch comprises a sensor, a clutch electric control unit, an actuator and a clutch.
The sensor collects the intention information of the driver, collects signals of all parts of the vehicle, transmits the signals to the clutch electric control unit, processes the signals and then sends corresponding instructions to the actuator, and the actuator controls the clutch; the clutch is provided with a hydraulic cylinder which is connected to a separation shifting fork on the clutch, and the actuator controls the expansion and contraction of the hydraulic cylinder so as to realize the control of the clutch; the actuator is a stepping motor pressure regulating valve.
The signals collected by the sensor comprise control signals and feedback signals.
The control signals comprise clutch pedal position, throttle position, engine speed, transmission input shaft speed and vehicle speed; the feedback signals comprise the rotation speed ratio of the clutch main disc and the clutch driven disc and the positions of the main disc and the driven disc; the acquisition of the signals is accomplished by corresponding sensors.
The sensor corresponding to the clutch pedal is a potentiometer type position sensor and consists of two non-contact linear potentiometer sensors.
The pressure regulating valve of the stepping motor is a seat valve type overflow valve with a pilot valve and adopts a secondary concentric structure.
The step motor pressure regulating valve comprises a valve seat, a main valve, a pilot valve, a step motor and a screw rod; the valve seat is of a through structure, the front end part of the valve seat is provided with an oil inlet, and the tail part of the valve seat is provided with a stepping motor; a main valve and a pilot valve are respectively arranged in front and behind the valve seat, a first oil outlet and a second oil outlet which penetrate through are respectively arranged on the valve seat walls corresponding to the main valve and the pilot valve, and a damping hole which penetrates through is also arranged in the center of the main valve; a circle of annular overflow valve seats are further arranged on the valve seats between the main valve and the pilot valve, the overflow valve seats are of conical structures, and the front parts of the corresponding pilot valves are of conical valve structures; the main valve and the pilot valve are respectively and correspondingly provided with springs, the main valve spring supports the main valve to the front part of the overflow valve seat, a lead screw is arranged on the shaft of the stepping motor, and the pilot valve spring supports the pilot valve to the lead screw.
A stepping motor type clutch for car is disclosed, which is operated by converting the movement of clutch pedal into electric signal by sensor; meanwhile, the engine rotating speed and the rotating speed of the transmission input shaft monitored by the sensor are converted into a specific rotating speed electric signal, and the output characteristic of the signal and the electric signal output by the clutch pedal are all the time in a linear output mode; the clutch electric control unit compares the two electric signals, if the two signals are different, and the actual engagement degree of the clutch does not meet the requirement, the clutch electric control unit sends out an instruction to control the stepping motor to rotate and control the compression amount of the valve core spring of the pilot valve, so that the liquid resistance of the pilot valve is changed, and further the change of the pressure of the front end system of the main valve core is controlled, so that the clutch release hydraulic pressure is increased or reduced until the two electric signals are the same.
The technical scheme adopted by the invention has the following beneficial effects:
the clutch control mechanism solves the problem of complicated power assisting of the traditional clutch, can remove the influence of clutch abrasion and fatigue deformation of the diaphragm spring on the torque transmission of the clutch, can effectively improve the working performance of the clutch by combining the intention of a driver and the running state of a vehicle, can reduce the difficulty of clutch control and improves the control precision of the clutch.
Drawings
FIG. 1 is a schematic of the workflow of the present invention.
Figure 2 is a schematic diagram of the structure of a pressure regulating valve of a stepping motor,
fig. 3 is a flow chart of the signal of the pressure regulating valve of the stepping motor.
Detailed Description
The invention is further illustrated below with reference to examples.
A stepping motor type automobile clutch as shown in fig. 1, which comprises a sensor, a clutch electric control unit, an actuator and a clutch.
The sensor collects the intention information of the driver, collects signals of all parts of the vehicle, transmits the signals to the clutch electric control unit, processes the signals and then sends corresponding instructions to the actuator, and the actuator controls the clutch; the clutch is provided with a hydraulic cylinder, the hydraulic cylinder is connected to a separation shifting fork on the clutch, namely, two ends of the separation shifting fork are respectively corresponding to the hydraulic cylinder and a separation bearing, and further, the expansion and the contraction of the hydraulic cylinder are controlled through an actuator to realize the control of the clutch; the actuator is a stepping motor pressure regulating valve.
The signals collected by the sensor comprise control signals and feedback signals.
The control signals comprise clutch pedal position, throttle position, engine speed, transmission input shaft speed and vehicle speed; the feedback signals comprise the rotation speed ratio of the clutch main disc and the clutch driven disc and the positions of the main disc and the driven disc; the acquisition of the signals is accomplished by corresponding sensors.
The sensor corresponding to the clutch pedal is a potentiometer type position sensor and consists of two non-contact linear potentiometer sensors.
The pressure regulating valve of the stepping motor is a seat valve type overflow valve with a pilot valve and adopts a secondary concentric structure.
As shown in fig. 2, the pressure regulating valve of the stepping motor comprises a valve seat 1, a main valve 2, a pilot valve 3, a stepping motor 4 and a screw rod 5; the valve seat 1 is of a through structure, the front end part of the valve seat 1 is provided with an oil inlet 101, and the tail part of the valve seat 1 is provided with a stepping motor 4; a main valve 2 and a pilot valve 3 are respectively arranged in the valve seat 1 front and back, a first oil outlet 102 and a second oil outlet 103 which penetrate through are respectively arranged on the walls of the valve seat 1 corresponding to the main valve 2 and the pilot valve 3, and a damping hole 201 which penetrates through is also arranged in the center of the main valve 2; a circle of annular overflow valve seat 104 is arranged in the valve seat 1 between the main valve 2 and the pilot valve 3, the overflow valve seat 104 is of a conical structure, and the front part of the corresponding pilot valve 3 is of a conical valve structure; the main valve 2 and the pilot valve 3 are respectively provided with springs, the main valve spring 202 supports the main valve 2 to the front part of the overflow valve seat 104, the shaft of the stepping motor 4 is provided with a lead screw 5, and the pilot valve spring 301 supports the pilot valve 301 to the lead screw 5.
The pressure regulating valve type clutch system of the stepping motor is a flexible control system, the rigid connection of a mechanical clutch is eliminated, and the pressure regulating valve type clutch system of the stepping motor comprises:
(1) Sensor for detecting a position of a body
The clutch pedal position sensor is a device reflecting the operation intention of a driver, and the core of the sensor is a potentiometer type position sensor which consists of two contactless linear potentiometer sensors, and when the position of the clutch pedal changes, the resistance value of the potentiometer changes linearly. Thus, the position and the change condition of the clutch pedal can be sensed, and the movement amount of the clutch pedal is converted into an electric signal to be sent to the clutch electric control unit.
The higher the pulse frequency of the induced voltage is, the rotation speed of the rotation shaft is calculated according to the number of the pulse frequency of the voltage induced in unit time, and the rotation speed of the rotation shaft can be converted into the rotation speed of the engine, the rotation speed of the transmission input shaft and the vehicle speed.
(2) Clutch electric control unit
The clutch electric control unit collects an engine rotation speed signal, a clutch driving disc signal, a transmission input shaft signal, a clutch driven disc signal, a clutch pedal position signal, a driving intention signal of a driver, a vehicle speed signal and a vehicle running state signal. And then the clutch electronic control unit controls the pressure regulating valve of the stepping motor according to the acquired signals, and finally the purpose reaches the optimal specific rotation speed, so that the position of the clutch pedal is accurately controlled. When the driver depresses the clutch pedal, the clutch pedal position sensor converts the clutch pedal movement amount into an electric signal. At the same time, the engine speed sensor and the transmission input shaft speed sensor are also converted into a specific speed electric signal, the output characteristic of the specific speed electric signal is the same as that of the clutch pedal position sensor, the two electric signals are simultaneously sent to the clutch electric control unit for comparison, if the two electric signals are different, the clutch electric control unit sends out a control signal to control the pressure regulating valve of the stepping motor to rotate in the forward direction (increasing clutch release hydraulic pressure) or the reverse direction (reducing clutch release hydraulic pressure) until the two electric signals are the same, and the actual engagement degree of the clutch is not required. The starting and shifting performance of the vehicle is improved. The clutch system of the stepping motor pressure regulating valve can accurately control the clutch engagement degree under the condition of starting and gear shifting of the vehicle, so that the vehicle can start more stably, and meanwhile, the abrasion of a main driven disc of the clutch is reduced.
(3) Actuator
The jerk of the clutch is related to the rate of change of the transmission output torque, and the specific friction work is related to the torque transmitted by the clutch and the angular speeds of the driving and driven plates. For a specific clutch system, the working parameters of the clutch are fixed, and the transmission torque of the clutch is only related to the pressing force of the clutch, so that the pressure regulating valve of the stepping motor is an important control element in the electrohydraulic control system of the clutch, and the characteristic of the pressure regulating valve greatly influences the working performance of the system. The pressure regulating valve for step motor is a digital control proportional valve using step motor as electronic-mechanical-hydraulic converter. As shown in FIG. 3, the stepping motor receives the control of pulse sequence, outputs a displacement rotation angle, the rotation angle is in direct proportion to the input pulse number, changes the rotation angle into the displacement of the valve core, and outputs hydraulic parameters through pilot stage and power stage secondary hydraulic amplification. In an electronically controlled clutch system, the engagement speed of the clutch is determined by the rotational speed of the stepper motor of the control mechanism. The clutch engagement speed is linearly related to the stepper motor rotational speed. The direction of the step number of the stepping motor also determines the movement direction of the clutch driven disc.
The pressure regulating valve of the stepping motor mainly uses the stepping motor to control the compression amount of the valve core spring of the pilot valve, thereby causing the change of the liquid resistance of the pilot valve, further controlling the change of the pressure of the front end system of the main valve core, and realizing the regulation of the pressure. The linear displacement of the stepping motor is in direct proportion to the pulse number, a digital pulse signal is generated by a computer or a singlechip during control, and the pressure regulation can be realized by controlling the output pulse number.
The pressure regulating valve of the stepping motor is a seat valve type overflow valve with a pilot valve, and adopts a two-stage concentric structure, namely, the cylindrical surface of the main valve core is required to be matched with the conical surface at the lower end and the main valve body. The overflow valve port adopts a cone valve structure with good sealing performance and basically has a zero opening state, so that the static characteristic of the valve is improved, the pressure overshoot is reduced, the pressure oil enters the front cavity of the main valve core from the oil inlet, enters the rear cavity of the main valve core, namely the front cavity of the pilot valve through the damping hole, and acts on the pilot valve core. When the system pressure is insufficient to overcome the restoring force of the pilot valve spring, the pilot valve is kept closed, the pressure oil in the valve does not flow, the front pressure and the back pressure of the damping hole are equal, and the left pressure receiving area of the main valve core is larger than the right pressure receiving area, so that the main valve core is kept closed under the action of the acting force difference and the spring restoring force. When the system pressure rises to exceed the opening pressure of the pilot valve core, the pilot valve is opened, and pressure oil overflows through the damping hole and the pilot valve and returns to the oil tank through the second oil outlet hole. When the overflow amount is small, the pressure difference between the front and the rear of the damping hole is small, at the moment, the hydraulic pressure generated by the difference between the left side surface and the right side surface of the main valve core is insufficient to overcome the restoring force of the main valve spring to open the main valve core, and at the moment, the main valve seals the channel between the oil inlet and the first oil outlet. When the pressure of the system is increased to the set pressure, the opening of the pilot valve is continuously increased, the overflow quantity is increased, the pressure drop caused by flowing through the damping hole is increased, the hydraulic pressure generated by the difference between the left side surface and the right side surface of the main valve core is enough to open the main valve core, and the oil returns to the oil tank through the first outlet hole, so that the opening process of the pressure regulating valve of the stepping motor is realized. The starting process of the pressure regulating valve of the stepping motor is the process of regulating the pressure of the pressure regulating valve of the stepping motor according to the position of the pilot valve.
When the clutch is in a full-engagement state, the pressure at the oil inlet is in a minimum state, and at the moment, the hydraulic cylinder piston of the clutch actuating mechanism is in a contracted state, so that the clutch driving and driven disc can be fully engaged. The first hydraulic oil flowing path is from the oil tank, the hydraulic pump oil inlet hole, the first oil outlet hole, the oil tank, the second hydraulic oil flowing path is from the oil tank, the hydraulic pump oil inlet hole, the damping hole, the pilot valve cavity, the second oil outlet hole and the oil tank. When the clutch is in a completely separated state, the pressure at the oil inlet is in a maximum state, and at the moment, the hydraulic cylinder piston of the clutch actuating mechanism is in an extended state, so that the clutch driving and driven discs are completely separated. The hydraulic oil flow path at this time is a tank-hydraulic pump-tank. The pressure at the oil inlet is between a minimum state and a maximum state when the clutch is in a friction state. This is specifically what state requires instructions from the clutch electronic control unit after the vehicle state and driver driving intention are collected. The hydraulic piston of the clutch is in a state of elongation at this time. One of the hydraulic oil flow paths at this time is from the oil tank, the hydraulic pump inlet port, the first outlet port, and the oil tank. The second way of hydraulic oil flow is from the oil tank, the oil inlet hole of the hydraulic pump, the damping hole, the pilot valve cavity, the second oil outlet hole and the oil tank. Only the hydraulic oil flowing through these two paths increases with the increase in the clutch engagement amount.
The hydraulic cylinder actuating mechanism of the stepping motor proportion pressure regulating valve clutch is improved on the basis of a traditional clutch release bearing and a release fork, and a hydraulic cylinder piston acts on the opposite end of the release fork, which is combined with the release bearing. Thus, the control precision of the clutch system can be ensured, and the control difficulty can be reduced.
The device is also required to be used together with the prior art such as a hydraulic pump, a hydraulic oil tank and the like in actual use, wherein a pressure regulating valve of a stepping motor is part of a hydraulic system which is specifically implemented.
Claims (1)
1. The utility model provides a step motor formula car clutch, it includes sensor, clutch electronic control unit, executor and clutch, its characterized in that: the sensor collects the intention information of the driver, collects signals of all parts of the vehicle, transmits the signals to the clutch electric control unit, processes the signals and then sends corresponding instructions to the actuator, and the actuator controls the clutch; the clutch is provided with a hydraulic cylinder, and the actuator controls the expansion and contraction of the hydraulic cylinder so as to realize the control of the clutch; the actuator is a stepping motor pressure regulating valve;
the signals collected by the sensor comprise control signals and feedback signals; the control signals comprise clutch pedal position, throttle position, engine speed, transmission input shaft speed and vehicle speed; the feedback signals comprise the rotation speed ratio of the clutch main disc and the clutch driven disc and the positions of the main disc and the driven disc; the acquisition of the signals is completed by corresponding sensors;
the sensor corresponding to the clutch pedal is a potentiometer type position sensor and consists of two non-contact linear potentiometer sensors;
the pressure regulating valve of the stepping motor is a seat valve type overflow valve with a pilot valve and adopts a secondary concentric structure;
the step motor pressure regulating valve comprises a valve seat, a main valve, a pilot valve, a step motor and a screw rod; the valve seat is of a through structure, the front end part of the valve seat is provided with an oil inlet, and the tail part of the valve seat is provided with a stepping motor; a main valve and a pilot valve are respectively arranged in front and behind the valve seat, a first oil outlet and a second oil outlet which penetrate through are respectively arranged on the valve seat walls corresponding to the main valve and the pilot valve, and a damping hole which penetrates through is also arranged in the center of the main valve; a circle of annular overflow valve seats are further arranged on the valve seats between the main valve and the pilot valve, the overflow valve seats are of conical structures, and the front parts of the corresponding pilot valves are of conical valve structures; the main valve and the pilot valve are respectively and correspondingly provided with springs, the main valve spring supports the main valve to the front part of the overflow valve seat, a lead screw is arranged on the shaft of the stepping motor, and the pilot valve spring supports the pilot valve to the lead screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811598458.6A CN109469689B (en) | 2018-12-26 | 2018-12-26 | Stepping motor type automobile clutch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811598458.6A CN109469689B (en) | 2018-12-26 | 2018-12-26 | Stepping motor type automobile clutch |
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| Publication Number | Publication Date |
|---|---|
| CN109469689A CN109469689A (en) | 2019-03-15 |
| CN109469689B true CN109469689B (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811598458.6A Active CN109469689B (en) | 2018-12-26 | 2018-12-26 | Stepping motor type automobile clutch |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113515156B (en) * | 2021-07-12 | 2022-02-08 | 安徽农业大学 | Tractor PTO control system and method based on multi-plate clutch |
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