CN110027522B - Pedal simulator, brake-by-wire system and vehicle - Google Patents
Pedal simulator, brake-by-wire system and vehicle Download PDFInfo
- Publication number
- CN110027522B CN110027522B CN201810031472.1A CN201810031472A CN110027522B CN 110027522 B CN110027522 B CN 110027522B CN 201810031472 A CN201810031472 A CN 201810031472A CN 110027522 B CN110027522 B CN 110027522B
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- Prior art keywords
- push rod
- transmission mechanism
- elastic
- pedal
- push
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
- B60T8/4081—Systems with stroke simulating devices for driver input
Abstract
The invention discloses a pedal simulator, a brake-by-wire system and a vehicle, wherein the pedal simulator comprises: the push rod, two elastic components, promotion part and helping hand part, the one end of every elastic component is only supported on the automobile body and the other end all is equipped with the bearing portion, two elastic components distribute in proper order along the axial of push rod, the push rod is supported the bearing portion of the elastic component that will be closest to the push rod through the promotion part and is pressed on the push rod, the bearing portion of two elastic components is spaced apart each other in the axial when the push rod is in the position of lifting up, the elastic component of keeping away from the push rod is supported in proper order to the bearing portion of the elastic component of neighbouring push rod in the adjacent elastic component, helping hand part can assist the promotion part to push away the push rod or keep away from the push rod direction and act on the promotion part. Therefore, the force applied to the push rod by the power assisting component is compensated or retarded, so that proper feedback force can be provided for a driver in the braking process of the driver, and the pedal feeling is improved.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a pedal simulator, a brake-by-wire system and a vehicle.
Background
In the related art, when the vehicle needs to be braked, the driver has to depress the brake pedal. For a conventional vehicle, the hydraulic or mechanical connection between the brake pedal and the brake of the conventional vehicle, the brake reaction force fed back by the brake system can directly act on the pedal to provide a comfortable and reasonable braking feeling for the driver. Due to the addition of electric braking to the electric vehicle and the cancellation of hydraulic or mechanical connection between the brake pedal and the brake, a driver cannot directly sense the reaction force (namely rigid feedback of the pedal) fed back to the brake pedal during braking, so that the braking feeling of the driver is poor, and the driving experience of the driver is influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the pedal simulator provided by the invention can reasonably simulate the stress of the pedal, improve the pedal feeling and improve the driving experience.
The invention also provides a brake-by-wire system with the pedal simulator and a vehicle.
A pedal simulator according to an embodiment of the first aspect of the invention includes: the push rod is used for normally abutting against the pressure bearing part of the elastic piece closest to the push rod through the pushing component and pressing the pressure bearing part on the push rod, the pressure bearing parts of the two elastic pieces are spaced from each other in the axial direction when the push rod is at a lifting position, and when the push rod moves towards the elastic pieces, the pressure bearing parts of the elastic pieces adjacent to the push rod in the adjacent elastic pieces sequentially abut against the elastic pieces far away from the push rod, and the power assisting component is constructed to assist the pushing component to push the push rod or act on the pushing component in a direction far away from the push rod.
According to the pedal simulator provided by the embodiment of the invention, when the push rod is pressed down, the pushing part firstly generates downward pressure on one elastic piece, when the pedal is stepped to a sufficient depth, the other elastic piece is compressed under the pushing of the first elastic piece, and when the elastic piece is compressed, the reaction force can be fed back to the push rod. When the force fed back to the push rod by the two elastic parts is smaller than the actual demand (namely the target pedal force) of the driver on the pedal force, the boosting part needs to compensate the feedback force which is correspondingly applied to the push rod, namely the boosting part needs to provide upward force to the push rod, so that the feedback force applied to the push rod can provide good braking feeling for the driver; when the force fed back to the push rod by the two elastic parts is larger than the actual demand (namely the target pedal force) of the pedal force of the driver, the boosting part needs to retard the feedback force applied to the push rod, namely the boosting part needs to provide downward force to the push rod, so that the feedback force applied to the push rod can provide proper braking feeling to the driver through the brake pedal.
According to some embodiments of the invention, the pedal simulator further comprises: the power assisting device comprises a control element, a displacement sensor and a force sensor, wherein the displacement sensor is electrically connected with the control element so as to detect the current displacement of the push rod and send a displacement signal to the control element, the force sensor is electrically connected with the control element so as to detect the current thrust borne by the push rod and send a thrust signal to the control element, and when the current thrust is not equal to the preset thrust corresponding to the current displacement, the power assisting device is controlled to be powered on and apply the thrust to the push rod through the pushing device until the current thrust is equal to the preset thrust.
In some embodiments, the two elastic members are sequentially distributed along the axial direction of the push rod, and the stiffness of the two elastic members is sequentially increased in a direction extending from the push rod to the power assisting component.
Optionally, each of the elastic members includes at least one spring, and the spring is any one of a disc spring and a compression spring.
In some embodiments, the two elastic pieces are located on a side of the pushing component away from the push rod, and the elastic piece closest to the push rod is in abutting fit with the pushing component through the bearing part inserted into the pushing component.
According to some embodiments of the invention, the pushing component comprises a plurality of pushing disks which are distributed at intervals in the axial direction and connected with each other, the moving member is located between any adjacent pushing disks, the power assisting component is provided with a power output part, the power output part can push one of the pushing disks in a first direction when moving towards the push rod, the power output part can push the other pushing disk in a second direction when moving away from the push rod, and the first direction is opposite to the second direction.
Furthermore, the two pushing discs are connected through a plurality of connecting rods, the connecting rods are uniformly distributed around the circumference of the pushing discs, and the moving piece is opposite to the push rod in the axial direction.
In some embodiments, the boost component comprises: the power assisting device comprises a driving motor, a first transmission mechanism and a second transmission mechanism, wherein the driving motor is provided with an output shaft, the first transmission mechanism comprises a driving part and a driven part, the driving part is in transmission engagement with the driven part, the driving part is connected with the output shaft through a speed reducer, the first transmission mechanism is any one of a chain transmission mechanism, a gear transmission mechanism, a belt transmission mechanism and a worm and gear transmission mechanism, the second transmission mechanism comprises a rotating part and a moving part, the rotating part and the moving part are in threaded transmission or in gear engagement, the rotating part is connected with the driven part, the moving part is formed into a power output part of the power assisting part, and the second transmission mechanism is any one of a gear rack transmission mechanism, a screw nut transmission mechanism and a ball screw transmission mechanism.
Further, the pedal simulator includes: simulator mount pad, drive mechanism mount pad and elastic component mount pad, be equipped with the direction spout in the simulator mount pad, promotion part slidable ground is located in the direction spout, a part of second drive mechanism is located in the simulator mount pad, the drive mechanism mount pad has the installation cavity, first drive mechanism with another part of second drive mechanism is located in the installation cavity, driving motor's output shaft stretches into in the installation cavity, the simulator mount pad with driving motor connects respectively the both sides of drive mechanism mount pad, the one end and the drive mechanism mount pad of elastic component mount pad are connected, the other end of elastic component mount pad with elastic component looks butt.
Furthermore, the transmission mechanism mounting seat is provided with an oil hole communicated with the mounting cavity, and a sealing bolt for sealing the oil hole is arranged in the oil hole.
Optionally, the pedal simulator further comprises a retractable dust cover, one end of the dust cover is connected with the elastic member, and the other end of the dust cover is fixedly connected with the pushing component.
A brake-by-wire system according to an embodiment of the second aspect of the invention includes the pedal simulator as described in the above embodiments.
Further, the present invention also proposes a vehicle comprising: the brake pedal simulator comprises a brake pedal and a pedal simulator, wherein one end of a push rod is connected with the brake pedal, and the other end of the push rod is abutted to a pushing component.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a pedal simulator and brake pedal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pedal simulator in accordance with an embodiment of the present invention.
Reference numerals:
the operation of the pedal simulator 100, the brake pedal 200,
a simulator mounting seat 11, a transmission mechanism mounting seat 12, a blocking cover 121, an elastic piece mounting seat 13,
a push rod 2, an elastic member 3, a pressure-bearing portion 31, a pushing member 4, a push disk 41, a connecting rod 42,
the auxiliary power part 5, the driving motor 51, the speed reducer 52, the first transmission mechanism 53, the driving part 531, the driven part 532, the second transmission mechanism 54, the moving part 541, the rotating part 542, the dust cover 6, the fastening part 7 and the elastic part abutting seat 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
At present, a brake-by-wire system is a brand new brake mechanism, and is an innovation on the functions of a brake driving mechanism and a touch device. The brake-by-wire system cancels a traditional hydraulic brake system, a motor provides a brake energy, an electric signal is used for transmitting the brake intention of a driver, and an actuating mechanism is an electronic mechanical brake actuator. When the vehicle is braked, the driver depresses the brake pedal 200, the brake pedal 200 is provided with the pedal simulator 100, and the pedal stroke signal CAN be transmitted to the Controller through a CAN (Controller Area Network) bus. The controller receives the speed of the vehicle, the current of the motor and the position signal of the rotor at the same time, and sends out a control signal through comprehensive calculation and analysis. The power driving circuit provides current with corresponding magnitude and direction to a driving part (such as a linear motor) of an electromechanical brake actuator (such as a drum brake or a disc brake) according to a control signal of the controller, so that the movement direction, the thrust magnitude and the movement speed of the driving part are controlled. In this way, the driving component drives an actuator (such as a parking brake actuator or a service brake actuator) to generate braking force to be transmitted to the wheels to brake.
The brake-by-wire system uses the pedal simulator 100 to simulate the characteristics of the brake pedal 200, eliminates the components of the conventional hydraulic brake systems such as a vacuum brake booster, a brake master cylinder, an oil reservoir and the like with larger volume, adopts the purely mechanical pedal simulator, removes intermediate variables (hydraulic pressure, air pressure and the like), improves the integration degree of the whole vehicle, and has quick response time and good mechanical performance. More importantly, the pedal simulator 100 of the embodiment of the invention is an improvement based on the poor driving feeling of the line control technology, and the existing pedal simulator 100 cannot accurately and intuitively feed back the pressure applied to the force sensor.
A pedal simulator 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 2.
As shown in fig. 1 and 2, a pedal simulator 100 according to an embodiment of the first aspect of the present invention includes: the push rod 2, two elastic pieces 3, pushing component 4 and helping hand part 5, one end of each elastic piece 3 is stopped to be abutted against the automobile body and the other end is provided with a bearing part 31, the two elastic pieces 3 are sequentially distributed along the axial direction of the push rod 2, the push rod 2 normally presses the bearing part 31 of the elastic piece 3 closest to the push rod 2 against the push rod 2 through the pushing component 4, the bearing parts 31 of the two elastic pieces 3 are spaced from each other in the axial direction when the push rod 2 is at a lifting position, and when the push rod 2 moves towards the elastic pieces 3, the bearing parts 31 of the elastic pieces 3 adjacent to the push rod 2 in the adjacent elastic pieces 3 are sequentially abutted against the elastic pieces 3 far away from the push rod 2, and the helping hand part 5 is configured to assist the pushing component 4 to be abutted against the push rod 2 or act on the pushing component 4 towards the direction far away from the push rod 2.
It can be understood that when the push rod 2 is pressed down, the pushing component 4 firstly generates downward pressure on one of the elastic members 3, when the pedal is stepped on to a sufficient depth, the other elastic member 3 is compressed under the pushing of the first elastic member 3, and the elastic member 3 feeds back the reaction force to the push rod 2 when compressed. When the force fed back to the push rod 2 by the two elastic members 3 is smaller than the actual demand of the driver for the pedal force (namely, the target pedal force), the boosting part 5 needs to compensate the feedback force to which the push rod 2 is subjected, namely, the boosting part 5 needs to provide upward force to the push rod 2, so that the feedback force to which the push rod 2 is subjected can provide good braking feeling for the driver; when the force fed back to the push rod 2 by the two elastic members 3 is larger than the actual demand of the driver for the pedal force (i.e., the target pedal force), the boosting component 5 needs to block the feedback force to which the push rod 2 should be subjected, i.e., the boosting component 4 needs to provide a downward force to the push rod 2, so that the feedback force to which the push rod 2 is subjected can provide the driver with a proper braking feeling through the brake pedal 200.
That is to say, the brake pedal 200 can push the push rod 2 to move, when the push rod 2 moves, the front stroke only presses one elastic member 3 to deform to obtain pressure feedback, the rear stroke push rod 2 can push two elastic members 3, and at the moment, the two elastic members 3 act on the push rod 2 at the same time, so that the pedal simulator 100 can make the elastic member 3 closest to the push rod 2 contract preferentially when the stress is small, and in the process that the stress of the push rod 2 is gradually increased, the two elastic members 3 contract gradually under the action of the push component 4 in sequence, so that the pedal force simulation effect of the pedal simulator 100 is more real.
The braking feeling includes various factors such as a pedal braking feeling, a vehicle braking deceleration felt by the driver, an audible braking noise, and a visual vehicle deceleration. The pedal brake feeling is the comprehensive feedback effect of multiple data such as pedal downward displacement, pedal feedback force and the like, the pedal brake feeling is the most important, and the good pedal brake feeling can improve the driving experience of a driver.
The working principle of the pedal simulator provided by the embodiment of the invention is as follows: the design goal of the pedal force is to simulate the pedal characteristics by the elastic member 3 and some control method. Since the acting force of the elastic member 3 mostly has a linear characteristic, and the pedal force characteristic is required to be nonlinear, the present invention simulates the reaction force (i.e. pedal force) applied to the pedal by combining the elastic member 3 and the boosting component 5, i.e. comprehensively simulates the pedal force by using the elastic force of the elastic member 3 and the driving force of the boosting component 5. Wherein the elastic member 3 provides a base pedal force to ensure a "brake feel" of the pedal in real time of operation of the brake system, and the booster unit 5 provides a target pedal force together with the elastic member 3 to compensate or block a remaining portion between the base pedal force and the target pedal force.
According to the pedal simulator 100 of the embodiment of the invention, the two elastic members 3 are sequentially distributed in the axial direction of the push rod 2, and further when a driver steps on the brake pedal 200, the elastic members 3 arranged adjacent to the push rod 2 are preferentially contracted, so that the two elastic members 3 are sequentially contracted to provide feedback force, and when the feedback force of the two elastic members 3 is inconsistent with the target pedal force, the current thrust force is adjusted through the power assisting part 5, so that the feedback force is consistent with the target pedal force, and the pedal simulator 100 can provide unnecessary stress feedback to the driver along with the stress change of different stages on the brake pedal 200, so as to improve the driving feeling.
In addition, after the vehicle is braked, the brake pedal 200 can be rapidly returned to the initial state (i.e., the natural extension state of the brake pedal 200 when the brake pedal 200 is not stepped) by the two elastic members 3 and the booster 5, so as to improve the operation stability of the vehicle.
In addition, the driver may adjust the current driving state of the vehicle according to the driving situation while driving the vehicle. That is, when the driver decelerates the vehicle to follow the vehicle, the driver needs to lightly step on the brake pedal 200 to decelerate, and when the driver brakes the vehicle suddenly to stop the vehicle, the driver needs to quickly and accurately step on the brake pedal 200 to the end of the braking stroke. In the above process, it is obvious that the force applied to the brake pedal 200 by the driver during deceleration and braking is different, and further, by providing the two elastic members 3, the pedal simulator 100 can feed back multi-level thrust according to the actual operation condition of the driver, so that the pedal simulator 100 can provide a feedback force closer to the target pedal force.
According to some embodiments of the invention, the pedal simulator 100 further comprises: control element, displacement sensor and force transducer, displacement sensor is connected with the control element electricity to detect the current displacement of push rod 2 and give control element with displacement signal transmission, force transducer is connected with the control element electricity, with the current thrust that detects push rod 2 and give control element with thrust signal transmission, helping hand part 5 when the thrust of predetermineeing that current thrust and current displacement correspond is unequal, control helping hand part 5 gets electricity and acts on push rod 2 with thrust through pushing component 4, until current thrust equals with predetermineeing thrust.
Optionally, the control element comprises an ECU and a current amplifier, and the current amplifier may amplify the current. This arrangement facilitates better control of the operating state of the power assist member 5 by the control element.
Specifically, the control element receives the force through the displacement of the push rod 2 fed back by the displacement sensor and the push rod 2 fed back by the force sensor, compares the displacement with a preset thrust when the push rod 2 preset in the control element reaches the displacement, and when the preset thrust is inconsistent with the current thrust, the power assisting part 5 works, and pushes the push rod 2 to be away from the elastic part 3 or move towards the elastic part 3 through the power assisting part 5, so that the feedback force provided by the two elastic parts 3 is increased or reduced, and the current thrust is consistent with the preset thrust. In this way, the current thrust is adjusted by the booster component 5 so that the thrust provided by the pedal simulator 100 is closer to the preset thrust.
In some embodiments, the two elastic members 3 are distributed in sequence along the axial direction of the push rod 2, and the stiffness of the two elastic members 3 increases in sequence in the direction extending from the push rod 2 to the power assisting element 5. That is, the stiffness of the elastic member 3 closer to the push rod 2 is smaller, and the stiffness of the elastic member 3 farther from the push rod 2 is larger.
Therefore, by arranging the plurality of elastic members 33 with different rigidity and elastic coefficients, the pedal simulator 100 can simultaneously contract under the pressure of the push rod 3 when the stress is small, and the rigidity of the elastic members 3 is kept stable, so that the thrust adjustment accuracy and the working stability of the pedal simulator 100 can be improved, and the load of the elastic members 3 with the small rigidity can be shared by the elastic members 3 with the large rigidity, so that the two elastic members 3 have longer service lives.
Alternatively, each elastic member 3 includes at least one spring, and the spring is any one of a disc spring and a compression spring. Like this, the chooseing for use of elastic component 3 is more reasonable, not only can reduce the manufacturing cost of footboard simulator 100, and the volume that adopts the spring as the footboard simulator 100 of elastic component 3 is littleer moreover, and the space occupies more rationally, arranges simplyr.
As shown in fig. 1, the two elastic members 3 are located on a side of the pushing member 4 away from the push rod 2, and the elastic member 3 closest to the push rod 2 is in abutting engagement with the pushing member 4 through a pressure-bearing portion 31 inserted into the pushing member 4.
Specifically, the push rod 2 extends into the push member 4, and contracts the elastic members 3 by pushing the push member 4, and the two elastic members 3 are located below the push member 4. Therefore, the push rod 2 is spaced from the elastic piece 3 below the pushing component 4, so that the direct contact between the push rod 2 and the elastic piece 3 below the pushing component 4 is avoided, and the braking working stability of the brake pedal 200 can be still ensured when the power assisting component 5 breaks down.
In the specific embodiment shown in fig. 1, the pushing member 4 includes a plurality of pushing disks 41 spaced apart from each other in the axial direction and connected to each other, the moving member 541 is located between any adjacent pushing disks 41, the assisting member 5 has a power output member, the power output member can push one of the pushing disks 41 in a first direction when moving toward the push rod 2, and the power output member can push the other pushing disk 41 in a second direction when moving away from the push rod 2, and the first direction is opposite to the second direction.
It should be noted that the first direction refers to a direction in which the power output member is axially close to the push rod 2, and the second direction refers to a direction in which the power output member is axially away from the push rod 2.
Thus, when the power assisting element 5 is required to compensate the pedal force, the power output member is controlled to move in the first direction to compensate the force on the basis of the basic pedal force applied to the push rod 2 by the two elastic members 3, so that the current thrust (current pedal force) is increased to be consistent with the preset thrust (target pedal force); when it is desired that the power assist member 5 retards the pedal force, the power take-off is controlled to move in the second direction to retard the force based on the base pedal force applied to the push rod 2 by the two elastic members 3.
Specifically, one of the push disks 41 which are distributed at intervals in the axial direction is located above the pushing member 4, and the other is located below the pushing member 4, so that when the power output member moves away from the push rod 2, the push disk 41 located below the pushing member 4 is pushed against to compress the elastic member 3, and when the power output member moves towards the push rod 2, the push disk 41 located above the pushing member 4 is pushed against. To reduce the stress on the elastic member 3.
As shown in fig. 1, the two push disks 41 are connected by a plurality of connecting rods 42, the connecting rods 42 are uniformly distributed around the circumference of the push disks 41, and the moving member 541 is axially opposite to the push rod 2. From this, not only a plurality of connecting rods 42 make two atress of pushing away dish 41 more even, promotion part 4 has higher structural stability, and moving member 541 is just right with push rod 2 moreover, and then moving member 541 can be along axial displacement on push rod 2 to carry on spacingly through push rod 2 to the removal of moving member 541, improve the motion stability of moving member 541.
In some embodiments, the boost component 5 comprises: the driving mechanism 53 comprises a driving part 531 and a driven part 532, the driving part 531 is in transmission engagement with the driven part 532, the driving part 531 is connected with the output shaft through a speed reducer 52, and the first transmission mechanism 53 is any one of a chain transmission mechanism, a gear transmission mechanism, a belt transmission mechanism and a worm and gear transmission mechanism.
The second transmission mechanism 54 includes a rotating member 542 and a moving member 541, the rotating member 542 and the moving member 541 are engaged by screw transmission or gear teeth, the rotating member 542 is connected with the driven member 532, the moving member 541 is formed as a power output member of the power assisting part 5, and the second transmission mechanism 54 is any one of a rack and pinion transmission mechanism, a lead screw nut transmission mechanism, and a ball screw transmission mechanism.
Therefore, the first transmission mechanism 53 transmits the power of the driving motor 51 to the second transmission mechanism 54, the second transmission mechanism 54 converts the rotation of the rotating member 542 into the linear reciprocating motion of the moving member 541, so that the pushing component 4 moves towards the push rod 2 or away from the push rod 2 under the action of the moving member 541, and thus, the power of the driving motor 51 can be transmitted to the pushing component 4 through the first transmission mechanism 53 and the second transmission mechanism 54, and the transmission is more stable, so that the movement of the moving member 541 is more stable.
As shown in fig. 2, the pedal simulator 100 includes: simulator mount pad 11, drive mechanism mount pad 12 and elastic component mount pad 13, be equipped with the direction spout in the simulator mount pad 11, push part 4 locates in the direction spout slidable, a part of second drive mechanism 54 is located simulator mount pad 11, drive mechanism mount pad 12 has the installation cavity, another part of first drive mechanism 53 and second drive mechanism 54 is located the installation cavity, the output shaft of driving motor 51 stretches into in the installation cavity, simulator mount pad 11 and driving motor 51 are connected respectively in the both sides of drive mechanism mount pad 12, and the one end of elastic component mount pad 13 is connected with drive mechanism mount pad 12, the other end and the 3 looks butt of elastic component mount pad 13.
Therefore, the pushing component 4 is arranged in the simulator mounting seat 11, and the first transmission mechanism 53 and part of the second transmission mechanism 54 are arranged in the transmission mechanism mounting seat 12, so that the arrangement of the boosting component 5 and the pushing component 4 is more reasonable, and the sliding of the pushing component 4 and the power transmission of the boosting component 5 can be more stable through the guide sliding groove.
In addition, the elastic piece 3 is abutted to the transmission mechanism mounting seat 12 through the elastic piece mounting seat 13, so that the connection stability of the elastic piece 3 and the transmission mechanism mounting seat 12 is improved, and the working stability of the elastic piece 3 is higher.
It should be noted that, referring to fig. 2, the simulator mounting seat 11 is fixed at a predetermined position on the vehicle body by a bolt, one end of the transmission mechanism mounting seat 12 is fixedly connected with the simulator mounting seat 11, the other end is connected with the elastic member mounting seat 13, the elastic member mounting seat 13 is provided with an accommodating space for the elastic member 3, and the elastic member mounting seat 13 is fixed on the vehicle body by the fastening member 7, so that one end of the elastic member 3 abuts against the vehicle body, and the other end abuts against the elastic member mounting seat 13, so that when the brake pedal 200 is stepped on, the elastic member 3 provides a feedback force of the brake pedal 200.
Of course, the present invention is not limited to this, the push rod can press the other elastic element 3 against the elastic element mounting seat 13 through the pushing component 4, the elastic element mounting seat 13 can be fixedly connected with the transmission mechanism mounting seat 12 and the simulator mounting seat 11 together to form a casing of the pedal simulator 100, the elastic element mounting seat 13 can also be mutually independent from the transmission mechanism mounting seat 12 and the simulator mounting seat 11 but fixed relative to the vehicle body, and the elastic element 3 can be a disc spring, the disc spring can be fixedly connected with the elastic element abutting seat 8 through the fastening component 7, and the elastic element 3 can be pressed against the elastic element abutting seat 8.
Referring to fig. 2, the transmission mechanism mounting seat 12 has an oil hole communicating with the mounting chamber, and a seal bolt 121 for sealing the oil hole is provided therein. Like this, sealing bolt 121 detachable installs on the oilhole, not only makes the operation of filling lubricating oil to the installation cavity indoor through the oilhole simpler, can prevent moreover that the dust from entering into the installation cavity indoor through the oilhole.
Of course, the present invention is not limited to this, and the oil hole may be blocked by a sealing bolt 121, or may be blocked by a cap or by blocking.
In the particular embodiment shown in fig. 2, the pedal simulator 100 further comprises a retractable dust cover 6, one end of the dust cover 6 being connected to the elastic member 3 and the other end being fixedly connected to the pushing member 4. Therefore, the dust cover 6 is externally sleeved on the push rod 2 to prevent dust from entering into a mounting cavity defined by the simulator mounting seat 11 and the transmission mechanism mounting seat 12 through the push rod 2 when the push rod 2 moves, so as to improve the working stability of the pedal simulator 100.
A brake-by-wire system according to an embodiment of the second aspect of the present invention includes the pedal simulator 100 as in the above-described embodiment.
According to the brake-by-wire system provided by the embodiment of the invention, by arranging the pedal simulator 100, the brake-by-wire system not only has higher working stability, but also can provide pedal force feedback for a driver in the use process so as to improve the driving feeling.
Further, the present invention also proposes a vehicle comprising: a brake pedal 200 and a pedal simulator 100, wherein one end of a push rod 2 is fixedly connected with the brake pedal 200 and the other end is pivotally connected with a pushing component 4.
According to the vehicle provided by the embodiment of the invention, when the driver steps on the brake pedal 200, the push component 4 can be pushed by the push rod 2, so that the pedal simulator 100 provides pedal force feedback for the driver, the driving feeling of the driver is improved, and the driver can adjust the force for stepping on the brake pedal 200 according to the driving feeling, and the driving safety of the vehicle is improved.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. A pedal simulator, comprising:
a push rod;
one end of each of the two elastic pieces abuts against the vehicle body, the other end of each of the two elastic pieces is provided with a bearing part, and the two elastic pieces are sequentially distributed along the axial direction of the push rod;
the push rod normally presses the bearing parts of the elastic pieces closest to the push rod against the push rod through the push component, the bearing parts of the two elastic pieces are spaced from each other in the axial direction when the push rod is at a lifting position, and when the push rod moves towards the elastic pieces, the bearing parts of the elastic pieces adjacent to the push rod in the adjacent elastic pieces sequentially push the elastic pieces far away from the push rod; and
a force assist member configured to assist the pushing member in pushing against the push rod or acting on the pushing member in a direction away from the push rod;
the push component comprises two push disks which are distributed at intervals in the axial direction and are connected with each other, the power assisting component is provided with a power output part, the power output part is located between any adjacent push disks, the power output part faces towards the push rod and can push one of the push disks in a first direction during movement, the power output part deviates from the push rod and can push the other push disk in a second direction during movement, and the first direction is opposite to the second direction.
2. The pedal simulator of claim 1, further comprising:
a control element;
the displacement sensor is electrically connected with the control element so as to detect the current displacement of the push rod and send a displacement signal to the control element; and
the force sensor is electrically connected with the control element to detect the current thrust borne by the push rod and send a thrust signal to the control element, and the power assisting component controls the power on of the power assisting component and acts the thrust on the push rod through the pushing component when the current thrust is not equal to the preset thrust corresponding to the current displacement until the current thrust is equal to the preset thrust.
3. The pedal simulator according to claim 1, wherein the two elastic members are sequentially distributed in an axial direction of the push rod, and the stiffness of the two elastic members is sequentially increased in a direction extending from the push rod to the booster component.
4. The pedal simulator according to claim 3, wherein each of the elastic members includes at least one spring, the spring being any one of a disc spring and a compression spring.
5. The pedal simulator according to claim 1, wherein the two elastic members are located on a side of the pushing member facing away from the push rod, and the elastic member closest to the push rod is in abutting engagement with the pushing member through the bearing portion inserted into the pushing member.
6. The pedal simulator according to claim 1, wherein the two push disks are connected by a plurality of connecting rods which are evenly distributed around the circumference of the push disks, and the power take-off is axially opposed to the push rod.
7. The pedal simulator according to any one of claims 1 to 6, wherein the booster component comprises:
a drive motor having an output shaft;
the first transmission mechanism comprises a driving part and a driven part, the driving part is in transmission engagement with the driven part, the driving part is connected with the output shaft through a speed reducer, and the first transmission mechanism is any one of a chain transmission mechanism, a gear transmission mechanism, a belt transmission mechanism and a worm and gear transmission mechanism; and
the second transmission mechanism comprises a rotating part and a moving part, the rotating part and the moving part are in threaded transmission or meshed through gear teeth, the rotating part is connected with the driven part, the moving part is formed into a power output part of the power assisting part, and the second transmission mechanism is any one of a gear rack transmission mechanism, a screw nut transmission mechanism and a ball screw transmission mechanism.
8. The pedal simulator of claim 7, further comprising:
the simulator comprises a simulator mounting seat, a pushing component and a second transmission mechanism, wherein a guide sliding chute is arranged in the simulator mounting seat, the pushing component is slidably arranged in the guide sliding chute, and one part of the second transmission mechanism is positioned in the simulator mounting seat;
the transmission mechanism mounting seat is provided with a mounting cavity, the other part of the first transmission mechanism and the second transmission mechanism is positioned in the mounting cavity, an output shaft of the driving motor extends into the mounting cavity, and the simulator mounting seat and the driving motor are respectively connected to two sides of the transmission mechanism simulator; and
one end of the elastic piece mounting seat is connected with the transmission mechanism mounting seat, and the other end of the elastic piece mounting seat is abutted to the elastic piece.
9. The pedal simulator according to claim 8, wherein the transmission mounting seat has an oil hole communicating with the mounting chamber, and a seal bolt is provided in the oil hole to close the oil hole.
10. The pedal simulator according to claim 1, further comprising a retractable dust cover having one end connected to the elastic member and the other end fixedly connected to the urging member.
11. A wire-actuated control system comprising a pedal simulator according to any one of claims 1 to 10.
12. A vehicle, characterized by comprising:
a brake pedal; and
the pedal simulator according to any one of claims 1 to 10, wherein one end of the push rod is connected to the brake pedal and the other end abuts against the urging member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810031472.1A CN110027522B (en) | 2018-01-12 | 2018-01-12 | Pedal simulator, brake-by-wire system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810031472.1A CN110027522B (en) | 2018-01-12 | 2018-01-12 | Pedal simulator, brake-by-wire system and vehicle |
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| CN110027522A CN110027522A (en) | 2019-07-19 |
| CN110027522B true CN110027522B (en) | 2021-09-21 |
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| CN110027522A (en) | 2019-07-19 |
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