CN117944646A - Electronic hydraulic brake with failure backup - Google Patents
Electronic hydraulic brake with failure backup Download PDFInfo
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- CN117944646A CN117944646A CN202410346081.4A CN202410346081A CN117944646A CN 117944646 A CN117944646 A CN 117944646A CN 202410346081 A CN202410346081 A CN 202410346081A CN 117944646 A CN117944646 A CN 117944646A
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Abstract
The invention is applicable to the technical field of automobiles, and provides an electronic hydraulic brake with failure backup, which comprises the following components: the driving motor is provided with a speed reducing mechanism, the speed reducing mechanism is movably connected with a transmission mechanism, one end of the transmission mechanism is provided with a brake master cylinder piston, and the brake master cylinder piston is movably connected with a brake master cylinder; the push rod is arranged on the brake pedal, the driving motor is hollow, and the push rod penetrates through the driving motor and the transmission mechanism; the angular displacement sensor is arranged on the brake pedal, and is electrically connected with the ECU, and the ECU is electrically connected with the driving motor; the brake pedal feel feedback device is arranged on the driving motor and is movably connected with the push rod; the invention structurally realizes failure backup, when the driving motor fails, the driver can still obtain enough brake pedal feel when the driving motor fails by stepping on the brake pedal to carry out emergency braking.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to an electronic hydraulic brake with a failure backup.
Background
With the continuous development and progress of science and technology and the continuous improvement of the performance of automobiles, the safety performance of automobiles becomes a main concern of automobile development, and thus the braking performance of automobiles becomes more and more important. Although the conventional hydraulic braking system can meet the braking requirements required by the normal running of the automobile, the conventional hydraulic braking system is complex in structure and has the defects of low response speed, low performance, insufficient braking force and the like. The electro-hydraulic brake system is an advanced brake system, which not only can effectively overcome the defects of the traditional hydraulic brake system, but also can provide higher safety and stability. As the electro-hydraulic brake is a core component in an electro-hydraulic brake system, it is necessary to design the electro-hydraulic brake reasonably and efficiently.
In one electro-hydraulic brake of the type CN111137257A [ P ]) issued by Ma Yuelong et al (Ma Yuelong, monument, huang, zhong Wenshi, huang Yongkuo, zhao, wang Wenlou, zhang Xin, you Zhenjun, xie Ning, liu Lijun), they use a combination of gear sets and lead screw nuts to save space. The working process of the brake is as follows: the driver steps on the brake pedal to push the push rod, the sleeve and the slide block to move, at the moment, the displacement sensor detects the movement of the slide block and feeds back signals to the ECU, so that the motor is controlled to operate, torque generated by the motor is transmitted to the screw rod through the gear set and the nut, the screw rod pushes the master cylinder piston to achieve the purpose of building pressure, and in the patent provided by Ma Yuelong et al, the gear nut and the gear set of the electronic hydraulic brake are in an external engagement mode, so that the transmission efficiency is influenced, and the influence caused by the external environment is possible.
Jo(Jo T、Joo K、 Lee J、 Control strategy of dual-winding motor for vehicle electro-hydraulic braking systems[J]) The method for utilizing the control strategy of the double-winding motor is proposed by the et al, the designed electronic hydraulic braking system consists of two identical Electronic Control Units (ECU), a double three-phase double-winding permanent magnet synchronous motor (DW-PMSM) and an actuator for generating brake fluid pressure, the control strategy of the system can effectively realize the function safety of the whole electronic hydraulic braking system through experiments, and the whole electronic hydraulic braking system proposed by Jo et al is very dependent on the design of a self control algorithm and the execution efficiency of a controller, so that failure easily occurs and the function cannot be realized.
Disclosure of Invention
The embodiment of the invention aims to provide an electronic hydraulic brake with a failure backup, and aims to solve the problems in the background technology.
The embodiment of the invention is realized in such a way that an electro-hydraulic brake with fail-back comprises:
The brake device comprises a driving motor, wherein a speed reducing mechanism is arranged on the driving motor, the speed reducing mechanism is movably connected with a transmission mechanism, one end of the transmission mechanism is provided with a brake master cylinder piston, and the brake master cylinder piston is movably connected with a brake master cylinder;
The push rod is arranged on the brake pedal, the driving motor is designed in a hollow mode, and the push rod penetrates through the driving motor and the transmission mechanism;
the angular displacement sensor is arranged on the brake pedal, and is electrically connected with an ECU, and the ECU is electrically connected with the driving motor;
And the brake pedal feel feedback device is arranged on the driving motor and is movably connected with the push rod.
As a further scheme of the invention, the speed reducing mechanism comprises a central gear, a gear and a gear ring, the transmission mechanism comprises a ball nut and a ball screw, an output shaft of the driving motor is fixedly connected with the central gear, the central gear is meshed with the gear, the gear is rotationally connected with the driving motor, the gear is meshed with the gear ring, the gear ring is fixedly connected with the ball nut, the ball nut is in threaded connection with the ball screw through a threaded connection pair, the brake master cylinder piston is arranged at one end of the ball screw, the ball screw is in hollow design, and the push rod penetrates through the ball screw.
As a further scheme of the invention, the brake pedal feel feedback device comprises a body, a first spring, a second spring, a first pressing block and a second pressing block, wherein the body is fixedly connected with the driving motor, the first spring is sleeved on the push rod, the push rod is in sliding connection with the body, the body is in sliding connection with the first pressing block, two ends of the first spring are respectively abutted against the body and the first pressing block, the body is in sliding connection with the second pressing block, and two ends of the second spring are respectively abutted against the second pressing block and the body.
Compared with the prior art, the invention has the beneficial effects that: the ball nut and the gear ring are fixedly connected, so that the transmission efficiency of the whole brake can be improved, and the whole structure can be ensured to have higher stability in operation; in addition, the invention carries out integrated design on the driving motor and the speed reducing mechanism, and is simpler and more compact in structure; the invention structurally realizes the effect of failure backup, when the driving motor fails, a driver can perform emergency braking by stepping on the brake pedal, which is more beneficial to the deployment of the brake.
Drawings
Fig. 1 is a schematic structural diagram of an electro-hydraulic brake with fail-back according to an embodiment of the present invention;
FIG. 2 is a target graph of a brake pedal feel feedback provided in an embodiment of the present invention;
fig. 3 is a block diagram of a brake pedal feel feedback device provided in an embodiment of the present invention.
In the accompanying drawings: 1-driving motor, 2-push rod, 3-brake pedal feel feedback ware, 31-body, 32-spring one, 33-spring two, 34-briquetting one, 35-briquetting two, 4-sun gear, 5-gear, 6-ring gear, 7-ball nut, 8-ball screw, 9-brake master cylinder, 10-brake master cylinder piston.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Specific implementations of the invention are described in detail below in connection with specific embodiments.
As shown in fig. 1 to 3, an electro-hydraulic brake with fail-back according to an embodiment of the present invention includes:
The brake device comprises a driving motor 1, wherein a speed reducing mechanism is arranged on the driving motor 1, the speed reducing mechanism is movably connected with a transmission mechanism, one end of the transmission mechanism is provided with a brake master cylinder piston 10, and the brake master cylinder piston 10 is movably connected with a brake master cylinder 9;
the push rod 2 is arranged on the brake pedal, the driving motor is in hollow design, and the push rod 2 penetrates through the driving motor 1 and the transmission mechanism;
the angular displacement sensor is arranged on the brake pedal, and is electrically connected with an ECU, and the ECU is electrically connected with the driving motor 1;
and the brake pedal feel feedback device 3 is arranged on the driving motor 1, and the brake pedal feel feedback device 3 is movably connected with the push rod 2.
In the present embodiment, the master cylinder piston 10 is disposed at an end of the push rod 2 remote from the brake pedal; the speed reducing mechanism comprises a central gear 4, a gear 5 and a gear ring 6, the transmission mechanism comprises a ball nut 7 and a ball screw 8, an output shaft of the driving motor 1 is fixedly connected with the central gear 4, the central gear 4 is meshed with the gear 5, the gear 5 is rotationally connected with the driving motor 1, the gear 5 is meshed with the gear ring 6, the gear ring 6 is fixedly connected with the ball nut 7, the ball nut 7 is in threaded connection with the ball screw 8 through a threaded connection pair, a brake master cylinder piston 10 is arranged at one end of the ball screw 8, the ball screw 8 is hollow, and the push rod 2 penetrates through the ball screw 8; the driving motor 1 is a power source of the whole electronic hydraulic brake and provides power to drive the brake to work normally; the driving motor 1 and the ball screw 8 adopt a hollow design mode, and the push rod 2 can directly push the brake master cylinder piston 10 through the hollow parts of the driving motor 1 and the ball screw 8; the speed reducing mechanism comprises a sun gear 4, a gear 5 and a gear ring 6, and the input of the high-speed low-torque driving motor 1 is converted into the torque output of the low-speed high-torque through the transmission principle of the gear so as to provide enough power to drive the brake to execute corresponding operation; the transmission mechanism comprises a ball nut 7 and a ball screw 8, and converts the torque output by the speed reducing mechanism into the transverse linear motion of the ball screw 8, so that a brake master cylinder piston 10 can be pushed to compress a brake master cylinder 9 to form brake fluid pressure;
The conventional working process comprises the following steps: the driver drives the push rod 2 to move forward by operating the brake pedal, at the moment, the angular displacement sensor recognizes a brake pedal angular displacement signal and feeds the signal back to the ECU, the ECU controls the driving motor 1 to operate to generate a driving moment to drive the central gear 4 to rotate, the rotation transmits the torque to the ball nut 7 through the speed reducing mechanism, the ball nut 7 generates rotation, the power is subsequently transmitted to the ball screw 8 through the threaded connection pair, and the brake master cylinder piston 10 is pushed by the transverse linear motion generated by the ball screw 8 to compress the brake master cylinder 9, so that the brake master cylinder 9 generates brake hydraulic pressure to achieve a braking effect;
The failure working process comprises the following steps: when the driving motor 1 fails and cannot work normally, a driver pushes the push rod 2 to move forward through the hollow parts of the driving motor 1 and the ball screw 8 by manipulating the brake pedal, and directly pushes the brake master cylinder piston 10 to compress the brake master cylinder 9, so that the brake master cylinder 9 generates brake hydraulic pressure to achieve a braking effect, and the brake pedal feel feedback device 3 can provide enough brake pedal feel for the driver;
the calculation and model selection process of each main part is described below, and the invention provides a calculation method, and the calculation method specifically needs to be selected according to the actual target vehicle type and braking requirement:
First, drive motor 1
The functions are as follows: it is a power source of the whole electronic hydraulic brake, and provides power to drive the brake to work normally.
The motor torque can be obtained by the following formula (1):
Wherein: For driving motor 1 torque,/> For maximum piston rod thrust of the master cylinder 9 during braking,/>Is the lead of the ball screw 8,/>For the mechanical efficiency of the ball screw 8,/>Is the transmission ratio of the speed reducing mechanism.
The rotational speed of the drive motor 1 can be obtained by the following formula (2):
Wherein: is the rotation speed of the motor,/> The linear movement speed of the ball screw 8 in the lateral direction.
Wherein,、/>、/>Is determined in the following selection of ball screw 8,/>In the following speed reducing mechanism selection, so the overall parameters of the motor are finally determined by/>The determination is needed according to the maximum piston push rod force required by the actual target vehicle type during braking.
(II) speed reducing mechanism
The functions are as follows: the high speed low torque motor input is converted to a low speed high torque output to provide sufficient power to drive the brake to perform the corresponding operation.
The reduction mechanism selected in the design is a gear reduction mechanism, and in order to facilitate better integration of the gear reduction mechanism and the driving motor 1, the structural size of the gear reduction mechanism should be designed according to the overall outline size of the selected driving motor 1, so that the size of the gear ring 6 can be determined according to the size of the selected driving motor 1.
The center distance d between the sun gear 4 and the gear 5 can be calculated by the formula (3):
Wherein: For gear 5 modulus,/> For the number of teeth of the sun gear 4,/>Is the number of teeth of the gear 5.
The dimensional relationship among the sun gear 4, the gear 5, and the ring gear 6 in the gear reduction mechanism is as shown in formula (4):
Wherein: Is the number of teeth of the gear ring 6.
The gear ratio calculation of the gear reduction mechanism is shown in formula (5):
Wherein: is the transmission ratio of the gear reduction mechanism.
The modulus of the gear 5 should be chosen to be standard and first from the first series, and the chosen modulus must be such that the number of teeth of the gear 5 calculated by the above three formulas is an integer value.
(III) ball screw 8 and ball nut 7
The functions are as follows: the torque output by the gear reduction mechanism is converted into the transverse linear motion of the ball screw 8, so that the piston can be pushed to compress the brake master cylinder 9 to form brake fluid pressure.
The piston stroke required by the braking master cylinder 9 isThe stroke of the brake master cylinder piston 10 is selected according to specific braking requirements, and the pressure building time of the brake master cylinder 9 can not exceed 0.4s when the automobile is braked emergently according to the braking requirements, otherwise, the braking stroke is too long, and the use safety is affected.
The speed of the linear movement of the ball screw 8 in the lateral direction can be calculated by the following equation (6):
Wherein: Is the transverse linear movement speed of the ball screw 8,/> For the time of pressure build-up of the master cylinder 9,/>Is the stroke of the master cylinder piston 10. According to the calculated transverse linear movement speed of the ball screw 8, the selection requirement of the ball screw 8 can be determined, so that the lead of the ball screw 8 can be determined.
The rotational speed of the ball nut 7 can be calculated from equation (7):
Wherein: Is the transverse linear movement speed of the ball screw 8,/> Is the lead of the ball screw 8.
Since the automobile is not braked urgently in most cases during use, the linear movement speed of the ball screw 8 and the rotational speed of the ball nut 7 are normally smaller than the above calculated values.
Referring to fig. 1 to 3, in an embodiment of the invention, the brake pedal feel feedback device 3 includes a body 31, a first spring 32, a second spring 33, a first pressing block 34 and a second pressing block 35, wherein the body 31 is fixedly connected with the driving motor 1, the first spring 32 is sleeved on the push rod 2, the push rod 2 is slidably connected with the body 31, the body 31 is slidably connected with the first pressing block 34, two ends of the first spring 32 respectively abut against the body 31 and the first pressing block 34, the body 31 is slidably connected with the second pressing block 35, and two ends of the second spring 33 respectively abut against the second pressing block 35 and the body 31.
In the present embodiment, the brake pedal feel feedback device 3 is a device that enables the driver to obtain a sufficient brake pedal feel when the vehicle is braked; the brake pedal feel is mainly described according to a relation curve of brake pedal force and brake pedal displacement, a target curve of a brake pedal feel feedback device 3 designed at this time is referred to fig. 2 (statistical data of a certain vehicle type, which can be suitable for the requirement of most drivers on the brake pedal feel, and can be recalculated according to concrete practice if needed);
The design adopts a double-spring structure to meet the requirement of a target curve, the A-B section is realized by the pretightening force of the first spring 32, the B-C section is realized by the compression deformation of the first spring 32, and the C-D section is realized by the compression deformation of the first spring 32 and the second spring 33 which are connected in parallel;
the stiffness of the first spring 32 is calculated as shown in formula (8):
Wherein: Is the stiffness of spring one 32,/> For the putter force at point B,/>For the push rod force at point C,/>For the displacement of the push rod 2 from the point B to the point C, design data are brought into the design data to obtain the rigidity/>, of the spring 32=1.81N/mm。
The stiffness of the second spring 33 is calculated as shown in formula (9):
Wherein: for the stiffness of spring two 33,/> For the total elastic coefficient from point C to point D,/>Is the stiffness of spring one 32,/>For the push rod force at point C,/>For the pushrod force at point D,/>For the displacement of the push rod 2 from the point C to the point D, design data are carried into to obtain the rigidity/>, of the spring II 33=22.22N/mm。
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. An electro-hydraulic brake having a fail-back, comprising:
The brake device comprises a driving motor, wherein a speed reducing mechanism is arranged on the driving motor, the speed reducing mechanism is movably connected with a transmission mechanism, one end of the transmission mechanism is provided with a brake master cylinder piston, and the brake master cylinder piston is movably connected with a brake master cylinder; the push rod is arranged on the brake pedal, the driving motor is designed in a hollow mode, and the push rod penetrates through the driving motor and the transmission mechanism;
the angular displacement sensor is arranged on the brake pedal, and is electrically connected with an ECU, and the ECU is electrically connected with the driving motor;
And the brake pedal feel feedback device is arranged on the driving motor and is movably connected with the push rod.
2. The electro-hydraulic brake with fail-safe according to claim 1, wherein the reduction mechanism comprises a sun gear, a gear and a ring gear, the transmission mechanism comprises a ball nut and a ball screw, an output shaft of the drive motor is fixedly connected with the sun gear, the sun gear is meshed with the gear, the gear is rotatably connected with the drive motor, the gear is meshed with the ring gear, the ring gear is fixedly connected with the ball nut, the ball nut is in threaded connection with the ball screw through a threaded connection pair, the brake master cylinder piston is arranged at one end of the ball screw, the ball screw is hollow, and the push rod penetrates through the ball screw.
3. The electro-hydraulic brake with fail-safe function according to claim 1, wherein the brake pedal feel feedback device comprises a body, a first spring, a second spring, a first pressing block and a second pressing block, wherein the body is fixedly connected with the driving motor, the first spring is sleeved on the push rod, the push rod is in sliding connection with the body, the body is in sliding connection with the first pressing block, two ends of the first spring respectively abut against the body and the first pressing block, the body is in sliding connection with the second pressing block, and two ends of the second spring respectively abut against the second pressing block and the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410346081.4A CN117944646A (en) | 2024-03-26 | 2024-03-26 | Electronic hydraulic brake with failure backup |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410346081.4A CN117944646A (en) | 2024-03-26 | 2024-03-26 | Electronic hydraulic brake with failure backup |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3020995A1 (en) * | 2014-11-10 | 2016-05-18 | Schaeffler Technologies GmbH & Co. KG | Hydraulic auxiliary actuator, as well as vehicle with hydraulic auxiliary factor |
| CN107054333A (en) * | 2017-03-01 | 2017-08-18 | 吉林大学 | The brake fluid system of motor control |
| CN107757380A (en) * | 2017-11-03 | 2018-03-06 | 吉林大学 | A kind of integrated electric energy assisted braking system |
| CN109624957A (en) * | 2019-02-26 | 2019-04-16 | 吉林大学 | A kind of integrated electric energy assisted braking system with novel coupled modes |
| CN110027529A (en) * | 2018-01-12 | 2019-07-19 | 比亚迪股份有限公司 | The pedal sense simulator of vehicle and vehicle with it |
| CN213619707U (en) * | 2020-09-01 | 2021-07-06 | 上海汇众汽车制造有限公司 | Pedal simulator |
-
2024
- 2024-03-26 CN CN202410346081.4A patent/CN117944646A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3020995A1 (en) * | 2014-11-10 | 2016-05-18 | Schaeffler Technologies GmbH & Co. KG | Hydraulic auxiliary actuator, as well as vehicle with hydraulic auxiliary factor |
| CN107054333A (en) * | 2017-03-01 | 2017-08-18 | 吉林大学 | The brake fluid system of motor control |
| CN107757380A (en) * | 2017-11-03 | 2018-03-06 | 吉林大学 | A kind of integrated electric energy assisted braking system |
| CN110027529A (en) * | 2018-01-12 | 2019-07-19 | 比亚迪股份有限公司 | The pedal sense simulator of vehicle and vehicle with it |
| CN109624957A (en) * | 2019-02-26 | 2019-04-16 | 吉林大学 | A kind of integrated electric energy assisted braking system with novel coupled modes |
| CN213619707U (en) * | 2020-09-01 | 2021-07-06 | 上海汇众汽车制造有限公司 | Pedal simulator |
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