Redundant brake-by-wire pedal
By designing a redundant wire-controlled driving pedal, combining the force feedback mechanism of multi-stage springs and disc springs, and independently powered stroke sensors, the problem of lack of redundant backup functions in the prior art is solved, and a high-safe automotive braking system is realized.
Patent Information
- Application Number
- CN202420639777.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-30
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-03-30
AI Technical Summary
There is a lack of a device in the prior art that can transmit brake foot feeling and braking signals while achieving redundant backup functions. Especially in the era of electrification and intelligence of automobiles, the safety performance of the brake system has been paid attention to.
A redundant wire-controlled driving pedal is designed, including a cylinder block, a first and second pedal force feedback mechanism, a push rod mechanism, a magnet steel and a stroke sensor. Through the combination of multi-stage springs and disc springs, different pedal feels are simulated; the stroke sensor has independent two-way power supply and signals to realize redundant output of the brake signal.
The simulation of different pedal feels is achieved, improving the safety of the car's braking, avoiding the risk of brake fluid leakage, and simplifying the installation and maintenance process.
Smart Images
Figure CN222793474U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of automobile braking, in particular to a redundant wire-controlled brake pedal. Background Art
[0002] With the continuous development of automobile electrification and intelligence, the degree of automobile electrification will become higher and higher, and it will become a trend to control automobiles through wire control technology. In the future, with the development and popularization of electronic mechanical brakes (EMB), the traditional hydraulic system will be cancelled, and the brake pedal and brake will be completely decoupled. This requires a pedal feel simulator to replace the original traditional power-assist device to provide a good pedal feel. At the same time, through flexible and reliable electrical signals as a medium for communication between the driver and the vehicle, the driver's intention is transmitted to the automobile brake controller, and the controller sends a control signal to achieve reliable braking of the car. At the same time, with the advent of the era of automobile electrification and intelligence, the braking safety performance of automobiles is also increasingly valued by people. Safety performance lies in the fact that once the actuator fails in the braking system, there must be a redundant backup to take over it and continue to perform the function in a short time.
[0003] In summary, a device is needed to transmit the brake feel and brake signal while achieving a redundant backup function. Utility Model Content
[0004] The utility model aims to provide a redundant wire-controlled brake pedal to solve the deficiencies in the prior art.
[0005] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is:
[0006] A redundant brake-by-wire pedal comprises: a cylinder body, a protective cover detachably connected to the front end of the cylinder body, a first pedal force feedback mechanism installed at one end of the cylinder body close to the protective cover, a second pedal force feedback mechanism installed at one end of the cylinder body away from the protective cover, a push rod mechanism abutted at the front end of the first pedal force feedback mechanism, a magnet sleeved at the end of the first pedal force feedback mechanism, and a travel sensor matched with the magnet installed on the outside of the cylinder body.
[0007] Preferably, the first pedal force feedback mechanism includes: a simulator push rod, and the simulator push rod includes: an integrally formed barrel and shaft, a spring seat is slidably provided at one end of the shaft close to the barrel, a small spring is provided between the barrel and the spring seat, and a large spring is provided between the spring seat and the inner wall of the cylinder body.
[0008] Preferably, an oil-free bushing is embedded in the inner wall of the cylinder body, and the barrel portion is slidably matched with the oil-free bushing.
[0009] Preferably, the push rod mechanism includes: a push rod, the head end of the push rod is connected to a U-shaped pedal connector, the end of the push rod is provided with an umbrella-shaped head, the umbrella-shaped head abuts against the end wall of the barrel, a groove is provided on the circumferential inner wall of the barrel, a spring fixing ring is passed through the push rod, the spring fixing ring is fixed in the groove, and a limiting spring is provided between the spring fixing ring and the umbrella-shaped head.
[0010] Preferably, it further comprises: a dust cover, wherein the front end of the dust cover is sleeved on the push rod, and the rear end is clamped on the protective cover.
[0011] Preferably, the magnetic steel is fixed to the end of the first pedal force feedback mechanism through a fixing nut, and a buffer sheet is provided between the magnetic steel and the fixing nut.
[0012] Preferably, the number of the travel sensor is single, and the travel sensor has two independent power supplies and independent signals.
[0013] Preferably, the number of the stroke sensors is two, and the two stroke sensors are sensors with independent power supply and independent signals respectively.
[0014] Preferably, the second pedal force feedback mechanism includes: a simulator rear cover, which is embedded in the end of the cylinder body and fixed by a simulator pressure ring, a piston column is arranged at the center of the simulator rear cover, a simulator piston is slidably arranged at the end of the piston column, a gasket is slidably arranged in the middle of the piston column, a primary disc spring is arranged between the simulator piston and the gasket, and a secondary disc spring is arranged between the gasket and the simulator rear cover.
[0015] Preferably, the second pedal force feedback mechanism comprises: an end cover nut, the end cover nut is fixed to the end of the cylinder body, and a rubber spring is embedded at the head end of the end cover nut.
[0016] The redundant wire-controlled brake pedal provided by the utility model has the following advantages compared with the prior art:
[0017] 1. By replacing the multi-stage spring of the first pedal force feedback mechanism, or replacing the disc spring or rubber spring of the second pedal force feedback mechanism, different pedal feelings can be simulated to match different vehicles;
[0018] 2. Redundancy of the braking signal is achieved by setting two independent power supply and independent signal sensors in a single stroke sensor, or by setting independent power supply and independent signal sensors in two stroke sensors, thereby improving the safety of vehicle braking;
[0019] 3. The utility model does not need to add brake fluid, so there is no risk of brake fluid leakage, and installation does not need to consider issues such as brake fluid filling and subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0021] Figure 1 This is a stereogram of a single stroke sensor used in the utility model;
[0022] Figure 2 This is a cross-sectional view of a single stroke sensor used in the utility model;
[0023] Figure 3 This is a stereogram of the utility model using two travel sensors;
[0024] Figure 4 This is a cross-sectional view of the rubber spring and the end cover nut adopted in the utility model.
[0025] In the figure: 1-U-shaped pedal connector, 2-push rod, 3-dust cover, 4-spring fixing retaining ring, 5-limit spring, 6-simulator push rod, 7-protective cover, 8-cylinder body, 9-oil-free bushing, 10-magnet, 11-buffer plate, 12-stroke sensor, 13-small spring, 14-spring seat, 15-large spring, 16-fixing nut, 17-simulator piston, 18-gasket, 19-simulator back cover, 20-secondary disc spring, 21-simulator pressure ring, 22-rubber spring, 23-end cover nut. DETAILED DESCRIPTION
[0026] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0027] refer to Figure 1-2 As shown, the utility model provides a redundant wire-controlled brake pedal, comprising: a cylinder body 8, a protective cover 7 is detachably connected to the head end of the cylinder body 8, a first pedal force feedback mechanism is installed at one end of the cylinder body 8 close to the protective cover 7, a second pedal force feedback mechanism is installed at one end of the cylinder body 8 away from the protective cover 7, the head end of the first pedal force feedback mechanism is abutted against a push rod mechanism, the end of the first pedal force feedback mechanism is sleeved with a magnet 10, and a travel sensor 12 compatible with the magnet 10 is installed on the outside of the cylinder body 8.
[0028] As a preferred embodiment, the first pedal force feedback mechanism comprises: a simulator push rod 6, the simulator push rod 6 comprises: an integrally formed barrel and shaft, a spring seat 14 is slidably provided at one end of the shaft close to the barrel, a small spring 13 is provided between the barrel and the spring seat 14, and a large spring 15 is provided between the spring seat 14 and the inner wall of the cylinder body 8. Preferably, a buffer pad is installed in the protective cover 7, and the buffer pad is interference-fitted with the inner hole of the protective cover 7 to prevent the barrel of the simulator push rod 6 from hard collision with the protective cover 7 when resetting.
[0029] As a preferred embodiment, an oil-free bushing 9 is embedded in the inner wall of the cylinder body 8 , and the barrel portion is slidably matched with the oil-free bushing 9 .
[0030] As a preferred embodiment, the push rod mechanism includes: a push rod 2, the head end of the push rod 2 is connected to a U-shaped pedal connector 1, the end of the push rod 2 is provided with an umbrella-shaped head, the umbrella-shaped head abuts against the end wall of the barrel, a slot is provided on the inner wall of the circumferential side of the barrel, a spring fixing retaining ring 4 is passed through the push rod 2, the spring fixing retaining ring 4 is fixed in the slot, and a limit spring 5 is provided between the spring fixing retaining ring 4 and the umbrella-shaped head. It also includes: a dust cover 3, the head end of the dust cover 3 is sleeved on the push rod 2, and the end is clamped on the protective cover 7. The spring fixing retaining ring 4 is clamped in the slot processed on the barrel of the simulator push rod 6, giving a certain pre-tightening force to the limit spring 5, which is used to keep the umbrella-shaped head of the push rod 2 abutting against the end wall of the barrel at all times, and there is a certain gap between the spring fixing retaining ring 4 and the push rod 2, so that the push rod 2 can swing.
[0031] As a preferred embodiment, the magnet 10 is fixed to the end of the first pedal force feedback mechanism by a fixing nut 16, and a buffer sheet 11 is provided between the magnet 10 and the fixing nut 16. The buffer sheet 11 is used to protect the magnet 10 and extend the service life of the magnet 10. It should be noted that when no force is applied, there is a certain gap between the fixing nut 16 and the second pedal force feedback mechanism.
[0032] like Figure 1 As shown, the number of the travel sensor 12 is only one, and it has two independent power supplies and independent signals.
[0033] like Figure 3 As shown, there are two travel sensors 12 , and the two travel sensors 12 each have an independent power supply and an independent signal.
[0034] like Figure 2As shown, the second pedal force feedback mechanism includes: a simulator rear cover 19, the simulator rear cover 19 is embedded in the end of the cylinder body 8 and fixed by a simulator pressure ring 21, a piston column is arranged at the center of the simulator rear cover 19, a simulator piston 17 is slidably arranged at the end of the piston column, a gasket 18 is slidably arranged in the middle of the piston column, a primary disc spring is arranged between the simulator piston 17 and the gasket 18, and a secondary disc spring 20 is arranged between the gasket 18 and the simulator rear cover 19. Preferably, the simulator piston 17 is processed with an air outlet.
[0035] like Figure 4 As shown, the second pedal force feedback mechanism includes: an end cover nut 23, the end cover nut 23 is fixed to the end of the cylinder body 8, and a rubber spring 22 is embedded at the head end of the end cover nut 23.
[0036] The working process and principle of the utility model are:
[0037] The brake-by-wire pedal includes four levels of spring force feedback, namely a small spring 13, a large spring 15, a primary disc spring and a secondary disc spring 20. The four parts are installed in series. When the pedal feel simulation function is realized, the push rod 2 pushes the simulator push rod 6 to move, first compressing the small spring 13. As the displacement of the simulator push rod 6 increases, the spring seat 14 contacts the simulator push rod 6, and the small spring 13 ends the working stroke, and then enters the large spring 15 compression stroke. As the displacement of the simulator push rod 6 further increases, the fixing nut 16 contacts the simulator piston 17 and is subjected to force. The movement of the simulator push rod 6 simultaneously generates a reaction force, which acts on the push rod 2 and then acts on the pedal to generate a pedal force. The small spring 13, the large spring 15, the primary disc spring and the secondary disc spring 20 can be replaced and matched independently to simulate different pedal feels. The displacement of the simulator push rod 6 is determined by the magnet 10 installed thereon and the stroke sensor 12 installed on the cylinder body 8. The stroke sensor 12 has a redundant function, with two independent power supplies and two signals that back up each other to ensure redundant output of the braking signal.
[0038] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0039] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0040] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.
Claims
1. A redundant brake-by-wire pedal, characterized in that: include: A cylinder body (8), the front end of the cylinder body (8) is detachably connected to a protective cover (7), a first pedal force feedback mechanism is installed at one end of the cylinder body (8) close to the protective cover (7), a second pedal force feedback mechanism is installed at one end of the cylinder body (8) away from the protective cover (7), the front end of the first pedal force feedback mechanism is abutted against a push rod mechanism, the end of the first pedal force feedback mechanism is sleeved with a magnet (10), and a travel sensor (12) compatible with the magnet (10) is installed on the outside of the cylinder body (8).
2. A redundant brake-by-wire pedal according to claim 1, characterized in that: The first pedal force feedback mechanism comprises: a simulator push rod (6), the simulator push rod (6) comprising: an integrally formed barrel and shaft, a spring seat (14) being slidably arranged at one end of the shaft close to the barrel, a small spring (13) being arranged between the barrel and the spring seat (14), and a large spring (15) being arranged between the spring seat (14) and the inner wall of the cylinder body (8).
3. A redundant brake-by-wire pedal according to claim 2, characterized in that: An oil-free bushing (9) is embedded in the inner wall of the cylinder body (8), and the barrel portion is in sliding cooperation with the oil-free bushing (9).
4. A redundant brake-by-wire pedal according to claim 2, characterized in that: The push rod mechanism comprises: a push rod (2), the head end of the push rod (2) is connected to a U-shaped pedal connector (1), the end of the push rod (2) is provided with an umbrella-shaped head, the umbrella-shaped head abuts against the end wall of the cylinder, a groove is provided on the inner wall of the circumference of the cylinder, a spring fixing retaining ring (4) is passed through the push rod (2), the spring fixing retaining ring (4) is fixed in the groove, and a limit spring (5) is provided between the spring fixing retaining ring (4) and the umbrella-shaped head.
5. A redundant brake-by-wire pedal according to claim 4, characterized in that: Also includes: A dust cover (3), wherein the front end of the dust cover (3) is sleeved on the push rod (2), and the rear end is clamped on the protective cover (7).
6. The redundant brake-by-wire pedal according to claim 1, characterized in that: The magnetic steel (10) is fixed to the end of the first pedal force feedback mechanism via a fixing nut (16), and a buffer sheet (11) is provided between the magnetic steel (10) and the fixing nut (16).
7. The redundant brake-by-wire pedal according to claim 1, characterized in that: The number of the travel sensor (12) is single, and it is a sensor with two independent power supplies and independent signals.
8. The redundant brake-by-wire pedal according to claim 1, characterized in that: The number of the travel sensors (12) is two, and the two travel sensors (12) are sensors with independent power supply and independent signals respectively.
9. The redundant brake-by-wire pedal according to claim 1, characterized in that: The second pedal force feedback mechanism comprises: a simulator rear cover (19), the simulator rear cover (19) is embedded in the end of the cylinder body (8) and fixed by a simulator pressure ring (21), a piston column is arranged at the center of the simulator rear cover (19), a simulator piston (17) is slidably arranged at the end of the piston column, a gasket (18) is slidably arranged in the middle of the piston column, a primary disc spring is arranged between the simulator piston (17) and the gasket (18), and a secondary disc spring (20) is arranged between the gasket (18) and the simulator rear cover (19).
10. The redundant brake-by-wire pedal according to claim 1, characterized in that: The second pedal force feedback mechanism comprises: an end cover nut (23), the end cover nut (23) is fixed to the end of the cylinder body (8), and a rubber spring (22) is embedded at the head end of the end cover nut (23).