Commercial vehicle brake pedal force control system and vehicle

Abstract

The present invention provides a commercial vehicle brake pedal force control system and vehicle, belonging to the field of vehicle development technology. The system includes: a brake pedal, a brake valve push rod, a brake valve, a rear air reservoir, a front air reservoir, a front circuit pressure-limiting valve, a rear circuit pressure-limiting valve, a front axle relay valve, and a rear axle relay valve. Compressed air in the front air reservoir enters the brake valve through the front circuit pressure-limiting valve and a first air inlet; compressed air in the rear air reservoir enters the brake valve through the rear circuit pressure-limiting valve and a second air inlet. When the brake pedal is depressed, the brake valve push rod moves, and the compressed air in the brake valve is discharged through the first and second air outlets to the rear axle relay valve and the front axle relay valve. When the brake pedal is returned, the brake valve push rod returns, and the compressed air in the brake valve is discharged through the first and second air outlets to the atmosphere. This invention reduces brake pedal force without changing the commercial vehicle assembly, reducing the design and manufacturing costs and difficulty of achieving brake pedal force reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle development, and in particular to a commercial vehicle brake pedal force control system and the vehicle. Background Art

[0002] The brake pedal is an important component of the vehicle's braking system. By applying force to the vehicle's braking system through the brake pedal, the vehicle can be slowed down or stopped. The reasonable design of the brake pedal force is an important basis for the safety and comfort of vehicle operation, and is also a guarantee of vehicle safety and comfort.

[0003] When the brake pedal is depressed, a reaction force is applied to the pedal. A high force can result in excessive pedal force, resulting in a loss of comfort and a safety risk. The existing method for reducing brake pedal force is to increase the brake pedal leverage ratio. This approach presents the following technical issues: 1. It requires the addition of specialized components, increasing manufacturing and production management costs. 2. Increasing the leverage ratio requires ergonomic considerations and comprehensive consideration of the driver's comfort when depressing the brake pedal, which increases design complexity.

[0004] Therefore, there is an urgent need to provide a commercial vehicle brake pedal force control system and vehicle, which can reduce the brake pedal force without increasing the manufacturing design cost and difficulty. Summary of the Invention

[0005] In view of this, it is necessary to provide a commercial vehicle brake pedal force control system and vehicle to solve the technical problems in the prior art of reducing the brake pedal force by increasing the brake pedal lever ratio, which leads to high manufacturing design costs and difficulty.

[0006] On one hand, to solve the above-mentioned technical problems, the present invention provides a commercial vehicle brake pedal force control system, comprising: a brake pedal, a brake valve push rod, a brake valve, a rear air reservoir, a front air reservoir, a front circuit pressure-limiting valve, a rear circuit pressure-limiting valve, a front axle relay valve, and a rear axle relay valve; the front circuit pressure-limiting valve is disposed between the front air reservoir and a first air inlet of the brake valve, the rear circuit pressure-limiting valve is disposed between the rear air reservoir and a second air inlet of the brake valve, and the first and second air outlets of the brake valve are communicated with the rear axle relay valve and the front axle relay valve, respectively;

[0007] The compressed air in the front air reservoir enters the brake valve through the front circuit pressure limiting valve and the first air inlet; the compressed air in the rear air reservoir enters the brake valve through the rear circuit pressure limiting valve and the second air inlet;

[0008] When the brake pedal is depressed, the brake valve push rod moves, so that the compressed air in the brake valve is discharged from the first air outlet and the second air outlet to the rear axle relay valve and the front axle relay valve;

[0009] When the brake pedal returns to its original position, the brake valve push rod returns to its original position, so that the compressed air in the brake valve is discharged into the atmosphere through the first air outlet and the second air outlet.

[0010] In a possible implementation, the output air pressure of the front circuit pressure limiting valve is 80%-100% of the output air pressure of the front air reservoir, and the output air pressure of the rear circuit pressure limiting valve is 80%-100% of the output air pressure of the rear air reservoir.

[0011] In a possible implementation, the system further includes an angular displacement sensor, which is used to monitor the angular displacement of the brake pedal in real time.

[0012] In a possible implementation, the system further includes a first air pressure sensor for monitoring the output air pressure of the front circuit pressure limiting valve in real time, and a second air pressure sensor for monitoring the output air pressure of the rear circuit pressure limiting valve in real time.

[0013] In a possible implementation, the system further includes a noise sensor for monitoring exhaust port noise of the brake valve in real time.

[0014] In one possible implementation, the system further includes a vehicle control unit, configured to obtain an angular displacement of the brake pedal and exhaust port noise of the brake valve, and determine a ratio of the angular displacement to a displacement time of the brake pedal;

[0015] When the ratio is less than or equal to the first ratio, a first control instruction is generated, and the front circuit pressure limiting valve and the rear circuit pressure limiting valve respond to the first control instruction to maintain the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve at a preset air pressure;

[0016] When the ratio is greater than the first ratio and less than the second ratio, and the exhaust port noise is less than a noise threshold, a second control instruction is generated, and the front circuit pressure limiting valve and the rear circuit pressure limiting valve respond to the second control instruction to linearly increase the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve on the basis of a preset air pressure until the exhaust port noise reaches the noise threshold, and stop increasing the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve. When the vehicle speed drops to zero, the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve are controlled to return to the preset air pressure.

[0017] When the ratio is greater than or equal to the second ratio, a third control instruction is generated, and the front circuit pressure limiting valve and the rear circuit pressure limiting valve respond to the third control instruction to linearly increase the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve based on the preset air pressure to the rated air pressure of the front air reservoir and the rear air reservoir until the vehicle speed drops to zero, and then control the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve to return to the preset air pressure;

[0018] The first ratio is smaller than the second ratio.

[0019] In a possible implementation, the system further includes an instrument, the vehicle control unit is configured to generate a noise abnormality signal when the exhaust port noise of the brake valve is greater than a noise threshold, and the instrument receives and displays the noise abnormality signal.

[0020] In one possible implementation, the vehicle control unit is also used to determine whether the exhaust port noise monitored by the noise sensor remains unchanged during the displacement time change control of the brake pedal. If so, a noise sensor abnormality signal is generated, and the instrument receives and displays the noise sensor abnormality signal.

[0021] In one possible implementation, the vehicle control unit is also used to determine whether the angular displacement of the brake pedal monitored by the angular displacement sensor remains unchanged during the displacement time change control of the brake pedal. If so, an angular displacement sensor abnormality signal is generated, and the instrument receives and displays the angular displacement sensor abnormality signal.

[0022] On the other hand, the present invention further provides a vehicle, including a commercial vehicle brake pedal force control system, wherein the commercial vehicle brake pedal force control system is the commercial vehicle brake pedal force control system described in any one of the possible implementations described above.

[0023] The beneficial effects of the present invention are as follows: the commercial vehicle brake pedal force control system provided by the present invention merely adds a front circuit pressure-limiting valve and a rear circuit pressure-limiting valve to the conventional commercial vehicle assembly. These valves reduce the pressure of the compressed air inputted into the brake valve from the front and rear air reservoirs, respectively, thereby reducing the reaction force when the brake pedal is depressed, thereby reducing the brake pedal force. This achieves the goal of reducing brake pedal force without changing the commercial vehicle assembly, reducing the design and manufacturing costs and difficulty of achieving this goal.

[0024] Furthermore, since the output air pressure of the first air outlet and the second air outlet of the brake valve is reduced, the exhaust noise when the brake pedal returns can also be reduced, so that the exhaust noise of commercial vehicles meets regulatory requirements. Compared with the noise reduction solutions in the prior art by installing sound insulation cotton or extending the brake valve exhaust pipe, there is no need to increase design or production costs, thereby reducing design and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic structural diagram of an embodiment of a commercial vehicle brake pedal force control system provided by the present invention;

[0027] Figure 2 This is a relative change curve diagram of the angular displacement and the displacement time of the brake pedal provided by the present invention. DETAILED DESCRIPTION

[0028] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present invention illustrate operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps that have no logical contextual relationship can be reversed in order or implemented simultaneously. In addition, those skilled in the art, guided by the content of the present invention, can add one or more other operations to the flowcharts or remove one or more operations from the flowcharts. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0030] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] The present invention provides a commercial vehicle brake pedal force control system and a vehicle, which are described below respectively.

[0032] Figure 1 This is a schematic structural diagram of an embodiment of a commercial vehicle brake pedal force control system provided by the present invention, as shown in FIG. Figure 1 As shown, the commercial vehicle brake pedal force control system 1 includes: a brake pedal 10, a brake valve push rod 20, a brake valve 30, a front air reservoir 40, a rear air reservoir 50, a front circuit pressure-limiting valve 60, a rear circuit pressure-limiting valve 70, a front axle relay valve 80, and a rear axle relay valve 90; the front circuit pressure-limiting valve 60 is arranged between the front air reservoir 40 and the first air inlet 31 of the brake valve 30, the rear circuit pressure-limiting valve 70 is arranged between the rear air reservoir 50 and the second air inlet 32 ​​of the brake valve 30, and the first air outlet 33 and the second air outlet 34 of the brake valve 30 are respectively connected to the rear axle relay valve 90 and the front axle relay valve 80;

[0033] The compressed air in the front air reservoir 40 enters the brake valve 30 through the front circuit pressure limiting valve 60 and the first air inlet 31; the compressed air in the rear air reservoir 50 enters the brake valve 30 through the rear circuit pressure limiting valve 70 and the second air inlet 32;

[0034] When the brake pedal 10 is depressed, the brake valve push rod 20 moves, causing the compressed air in the brake valve 30 to be discharged from the first air outlet 33 and the second air outlet 34 to the rear axle relay valve 90 and the front axle relay valve 80 ;

[0035] When the brake pedal 10 returns to its original position, the brake valve push rod 20 returns to its original position, so that the compressed air in the brake valve 30 is discharged into the atmosphere through the first air outlet 33 and the second air outlet 34 .

[0036] It should be noted that the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 are used to reduce the output air pressure of the front air reservoir 40 and the rear air reservoir 50 respectively.

[0037] The brake pedal 10 is fixedly connected to the brake valve push rod 20 .

[0038] Compared to the prior art, the commercial vehicle brake pedal force control system 10 provided by the present invention merely adds a front circuit pressure-limiting valve 60 and a rear circuit pressure-limiting valve 70 to the conventional commercial vehicle assembly. These valves, respectively, reduce the pressure of the compressed air supplied to the brake valve 30 from the front and rear air reservoirs 40 and 50, thereby reducing the reaction force when the brake pedal 10 is depressed, thereby reducing the brake pedal force. This achieves the goal of reducing brake pedal force without changing the commercial vehicle assembly, reducing the design and manufacturing costs and difficulty of achieving this goal.

[0039] Furthermore, since the output air pressure of the first air outlet 33 and the second air outlet 34 of the brake valve 30 is reduced, the exhaust noise when the brake pedal 10 returns to its position can also be reduced, so that the exhaust noise of the commercial vehicle meets the regulatory requirements. Compared with the noise reduction solution in the prior art by installing sound insulation cotton or extending the brake valve exhaust pipe, there is no need to increase the design or production cost, thereby reducing the design and production cost.

[0040] In some embodiments of the present invention, both the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 are adjustable pressure limiting valves, and their output air pressures are adjustable.

[0041] Specifically, the output pressure of the front circuit pressure limiting valve 60 is 80%-100% of the output pressure of the front air reservoir 40 , and the output pressure of the rear circuit pressure limiting valve 70 is 80%-100% of the output pressure of the rear air reservoir 50 .

[0042] In a specific embodiment of the present invention, if the vehicle pressure is set to 10 bar, the rated pressure of the front air reservoir 40 is 10 bar, and the rated pressure of the rear air reservoir 50 is 10 bar. Consequently, the output pressure of the front circuit pressure-limiting valve 60 is between 8 bar and 10 bar, and the output pressure of the rear circuit pressure-limiting valve 70 is also between 8 bar and 10 bar.

[0043] Specifically, the output air pressure of the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 are both 8 bar.

[0044] Tests have verified that when a commercial vehicle's brake pedal force control system 10 is not equipped with the front circuit pressure-limiting valve 60 and the rear circuit pressure-limiting valve 70, the driver depresses the brake pedal 10. The brake pedal force, through the brake valve push rod 20, pushes the push rod of the brake valve 30. During this movement, the push rod transmits the compressed air in the brake valve 30 through the first and second air outlets 33 and 34 of the brake valve 30, respectively. As the angular displacement of the brake pedal increases, the air pressure in the first and second air outlets 33 and 34 of the brake valve 30 gradually increases between 0 and 10 bar. Accordingly, the reaction force felt by the driver's foot on the brake pedal 10 also gradually increases. When the angular displacement of the brake pedal 10 reaches its maximum, the air pressure in the first and second air outlets 33 and 34 of the brake valve 30 reaches 10 bar, and the brake pedal force reaches 350N.

[0045] When the commercial vehicle brake pedal force control system 10 is equipped with the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70, the driver depresses the brake pedal 10. The brake pedal force, through the brake valve push rod 20, pushes the push rod of the brake valve 30. During this movement, the push rod transmits the compressed air in the brake valve 30 through the first and second air outlets 33, 34 of the brake valve 30, respectively. As the angular displacement of the brake pedal increases, the air pressure in the first and second air outlets 33, 34 of the brake valve 30 gradually increases between 0 bar and 8 bar. Accordingly, the reaction force felt by the driver's foot on the brake pedal 10 also gradually increases. When the angular displacement of the brake pedal 10 reaches its maximum, the air pressure in the first and second air outlets 33, 34 of the brake valve 30 reaches 8 bar. At this point, the brake pedal force reaches 290 N, a 17% reduction in brake pedal force.

[0046] Similarly, when the commercial vehicle brake pedal force control system 10 is not equipped with the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70, the air pressure at the first and second air outlets 33 and 34 of the brake valve 30 reaches 10 bar, and the exhaust noise reaches 73.6 dB. When the commercial vehicle brake pedal force control system 10 is equipped with the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70, the air pressure at the first and second air outlets 33 and 34 of the brake valve 30 is 8 bar, and the exhaust noise reaches 70.9 dB, reducing the exhaust noise of the brake valve 30 by 4%.

[0047] In order to realize real-time monitoring of various parameters and improve the driving safety of commercial vehicles, in some embodiments of the present invention, Figure 1 As shown, the commercial vehicle brake pedal force control system 10 further includes an angular displacement sensor 100 , a first air pressure sensor 110 , a second air pressure sensor 120 , and a noise sensor 130 ;

[0048] The angular displacement sensor 100 is used to monitor the angular displacement of the brake pedal 10 in real time;

[0049] The first air pressure sensor 110 is used to monitor the output air pressure of the front circuit pressure limiting valve 60 in real time;

[0050] The second air pressure sensor 120 is used to monitor the output air pressure of the rear circuit pressure limiting valve 70 in real time;

[0051] The noise sensor 130 is used to monitor the exhaust port noise of the brake valve 30 in real time.

[0052] The embodiment of the present invention realizes real-time monitoring of the angular displacement of the brake pedal 10, the output air pressure of the front circuit pressure-limiting valve 60, the output air pressure of the rear circuit pressure-limiting valve 70, and the exhaust port noise of the brake valve 30 by providing an angular displacement sensor 100, a first air pressure sensor 110, a second air pressure sensor 120, and a noise sensor 130. Based on the monitoring data of the above sensors, accurate control of the brake pedal force of a commercial vehicle can be achieved.

[0053] Since commercial vehicles may have multiple scenarios such as emergency braking, general braking, and braking during operation, in order to achieve differentiated control in multiple scenarios and thereby improve the control accuracy of the brake pedal force control system 10, in some embodiments of the present invention, such as Figure 1 As shown, the commercial vehicle brake pedal force control system 10 further includes a vehicle control unit 140, which is used to obtain the angular displacement of the brake pedal 10 and the exhaust port noise of the brake valve 30, and determine the ratio of the angular displacement to the displacement time of the brake pedal 10;

[0054] When the ratio is less than or equal to the first ratio, a first control instruction is generated, and the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 respond to the first control instruction to maintain the output pressure of the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 at the preset pressure;

[0055] When the ratio is greater than the first ratio and less than the second ratio, and the exhaust port noise is less than the noise threshold, a second control instruction is generated, and the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 respond to the second control instruction to linearly increase the output air pressure of the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 on the basis of the preset air pressure until the exhaust port noise reaches the noise threshold, and stop increasing the output air pressure of the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70. When the vehicle speed drops to zero, the output air pressure of the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 is controlled to return to the preset air pressure;

[0056] When the ratio is greater than or equal to the second ratio, a third control instruction is generated. The front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 respond to the third control instruction and linearly increase the output air pressure of the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 from the preset air pressure to the rated air pressure of the front air reservoir 40 and the rear air reservoir 50 until the vehicle speed drops to zero. The output air pressure of the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 is then restored to the preset air pressure.

[0057] The first ratio is smaller than the second ratio.

[0058] It should be understood that when the ratio is less than or equal to the first ratio, it is a braking scenario. Maintaining the output pressure of the front and rear circuit pressure-limiting valves 60 and 70 at the preset pressure can achieve gentle braking and maintain braking comfort. When the ratio is greater than the first ratio but less than the second ratio, it is normal braking. In this case, by linearly increasing the output pressure of the front and rear circuit pressure-limiting valves 60 and 70 from the preset pressure until the exhaust port noise reaches the noise threshold, braking can be achieved while meeting the braking noise requirement. When the ratio is greater than or equal to the second ratio, it is an emergency braking scenario. In this case, by linearly increasing the output pressure of the front and rear circuit pressure-limiting valves 60 and 70 from the preset pressure to the rated pressure of the front and rear air reservoirs 40 and 50, braking safety is prioritized, regardless of braking noise.

[0059] In summary, the embodiment of the present invention implements braking strategies in three different situations: point braking, general braking, and emergency braking, and meets the braking noise and comfort requirements while ensuring braking safety.

[0060] It should be noted that the preset air pressure is the rated air pressure of the vehicle, that is, 10 bar, and the noise threshold is 75dB.

[0061] In an embodiment of the present invention, the angular displacement and the displacement time of the brake pedal are plotted into a curve, such as Figure 2 As shown, when the changing area of ​​the angular displacement and the position time of the brake pedal is in area A, it is a braking scenario; when the changing area of ​​the angular displacement and the position time of the brake pedal is in area B, it is a general braking scenario; when the changing area of ​​the angular displacement and the position time of the brake pedal is in area C, it is an emergency braking scenario. Figure 2 Where l0 is the first ratio and l1 is the second ratio.

[0062] In order to monitor and handle abnormal situations and improve the abnormal response capability of the commercial vehicle brake pedal force control system 10, in some embodiments of the present invention, for example, Figure 1As shown, the commercial vehicle brake pedal force control system 10 further includes a meter 150 . The vehicle control unit 140 is configured to generate a noise abnormality signal when the exhaust port noise of the brake valve 30 is greater than a noise threshold. The meter 150 receives and displays the noise abnormality signal.

[0063] The embodiment of the present invention receives and displays the abnormal noise signal through the instrument 150, which can intuitively remind the driver or other vehicle maintenance personnel that the exhaust port noise of the brake valve 30 is abnormal, providing a signal reference for subsequent maintenance and abnormality processing.

[0064] Since the noise sensor 130 and the angular displacement sensor 100 may be damaged with age or changes in operating conditions, in order to avoid the technical problem of unreasonable control of the brake pedal force of the commercial vehicle due to the inability to obtain this information in time when the noise sensor 130 and the angular displacement sensor 100 are damaged.

[0065] In some embodiments of the present invention, the vehicle control unit 140 is also used to determine whether the exhaust port noise monitored by the noise sensor 130 remains unchanged during the displacement time change control of the brake pedal 10. If so, a noise sensor abnormality signal is generated, and the instrument 150 receives and displays the noise sensor abnormality signal.

[0066] The vehicle control unit 140 is also used to determine whether the angular displacement of the brake pedal 10 monitored by the angular displacement sensor 100 remains unchanged during the displacement time change control of the brake pedal 10. If so, an angular displacement sensor abnormality signal is generated, and the instrument 150 receives and displays the angular displacement sensor abnormality signal.

[0067] In the embodiment of the present invention, the vehicle control unit 140 is provided with judgment logic for abnormal conditions of the noise sensor 130 and the angular displacement sensor 100. When abnormal conditions occur in the noise sensor 130 and the angular displacement sensor 100, the abnormal signals of the noise sensor and the abnormal signals of the angular displacement sensor are displayed on the instrument 150. This enables abnormality monitoring of the noise sensor 130 and the angular displacement sensor 100, thereby further improving the accuracy of brake pedal force control.

[0068] Similarly, the first air pressure sensor 110 and the second air pressure sensor 120 also need to monitor abnormalities. Specifically, the vehicle control unit 140 is also used to determine whether the air pressure values ​​monitored by the first air pressure sensor 110 and the second air pressure sensor 120 remain unchanged during the displacement time change control of the brake pedal 10. If so, an air pressure sensor abnormality signal is generated, and the instrument 150 receives and displays the air pressure sensor abnormality signal.

[0069] The embodiment of the present invention realizes the monitoring of abnormal conditions of each sensor, avoids the technical problem of inaccurate control of the final brake pedal force due to sensor abnormality, and ensures the accuracy of brake pedal force control.

[0070] It should be noted that when abnormal signals from various sensors appear on the instrument 150 , the driver may be reminded to go to a relevant service station to check the corresponding sensor.

[0071] Specifically, if the output air pressure of the front circuit pressure limiting valve 60 and the rear circuit pressure limiting valve 70 is 8 bar during braking, but the exhaust port noise value of the brake valve 30 reaches dB>75dB, the vehicle control unit 140 will feedback an abnormal noise signal to the instrument 150, reminding the driver to go to the relevant service station to check the brake valve.

[0072] When the displacement time of the brake valve changes, if the exhaust noise value of the brake valve 30 remains unchanged, the vehicle control unit 140 judges that the brake valve noise sensor is abnormal, and feeds back the abnormal signal to the instrument 150, reminding the driver to go to the relevant service station to check the brake valve exhaust port noise sensor.

[0073] When the displacement time of the brake valve changes, if the brake pedal angular displacement value remains unchanged, the vehicle control unit 140 determines that the brake pedal angular displacement sensor is abnormal and feeds back the abnormal signal to the instrument 150, reminding the driver to go to the relevant service station to check the brake pedal angular displacement sensor.

[0074] On the other hand, the present invention further provides a vehicle, comprising a commercial vehicle brake pedal force control system, wherein the commercial vehicle brake pedal force control system is the commercial vehicle brake pedal force control system in any one of the above embodiments.

[0075] The above is a detailed introduction to a commercial vehicle brake pedal force control system and a vehicle provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A commercial vehicle brake pedal force control system, characterized in that: include: a brake pedal, a brake valve push rod, a brake valve, a rear air reservoir, a front air reservoir, a front circuit pressure-limiting valve, a rear circuit pressure-limiting valve, a front axle relay valve, and a rear axle relay valve; the front circuit pressure-limiting valve is arranged between the front air reservoir and the first air inlet of the brake valve, the rear circuit pressure-limiting valve is arranged between the rear air reservoir and the second air inlet of the brake valve, and the first air outlet and the second air outlet of the brake valve are communicated with the rear axle relay valve and the front axle relay valve, respectively; The compressed air in the front air reservoir enters the brake valve through the front circuit pressure limiting valve and the first air inlet; the compressed air in the rear air reservoir enters the brake valve through the rear circuit pressure limiting valve and the second air inlet; When the brake pedal is depressed, the brake valve push rod moves, so that the compressed air in the brake valve is discharged from the first air outlet and the second air outlet to the rear axle relay valve and the front axle relay valve; When the brake pedal returns to its original position, the brake valve push rod returns to its original position, so that the compressed air in the brake valve is discharged into the atmosphere through the first air outlet and the second air outlet; The system further includes a vehicle control unit configured to obtain an angular displacement of the brake pedal and exhaust port noise of the brake valve, and determine a ratio of the angular displacement to a displacement time of the brake pedal; When the ratio is less than or equal to the first ratio, a first control instruction is generated, and the front circuit pressure limiting valve and the rear circuit pressure limiting valve respond to the first control instruction to maintain the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve at a preset air pressure.

2. The commercial vehicle brake pedal force control system according to claim 1, characterized in that: The output air pressure of the front circuit pressure limiting valve is 80%-100% of the output air pressure of the front air reservoir, and the output air pressure of the rear circuit pressure limiting valve is 80%-100% of the output air pressure of the rear air reservoir.

3. The commercial vehicle brake pedal force control system according to claim 1, characterized in that: The system further comprises an angular displacement sensor, which is used to monitor the angular displacement of the brake pedal in real time.

4. The commercial vehicle brake pedal force control system according to claim 3, characterized in that: The system further includes a first air pressure sensor for monitoring the output air pressure of the front circuit pressure limiting valve in real time, and a second air pressure sensor for monitoring the output air pressure of the rear circuit pressure limiting valve in real time.

5. The commercial vehicle brake pedal force control system according to claim 4, characterized in that: The system further includes a noise sensor for monitoring exhaust port noise of the brake valve in real time.

6. The commercial vehicle brake pedal force control system according to claim 5, characterized in that: When the ratio is greater than the first ratio and less than the second ratio, and the exhaust port noise is less than a noise threshold, a second control instruction is generated, and the front circuit pressure limiting valve and the rear circuit pressure limiting valve respond to the second control instruction to linearly increase the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve on the basis of a preset air pressure until the exhaust port noise reaches the noise threshold, and stop increasing the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve. When the vehicle speed drops to zero, the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve are controlled to return to the preset air pressure. When the ratio is greater than or equal to the second ratio, a third control instruction is generated, and the front circuit pressure limiting valve and the rear circuit pressure limiting valve respond to the third control instruction to linearly increase the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve based on the preset air pressure to the rated air pressure of the front air reservoir and the rear air reservoir until the vehicle speed drops to zero, and then control the output air pressure of the front circuit pressure limiting valve and the rear circuit pressure limiting valve to return to the preset air pressure; The first ratio is smaller than the second ratio.

7. The commercial vehicle brake pedal force control system according to claim 6, characterized in that: The system further includes an instrument. The vehicle control unit is configured to generate a noise abnormality signal when the exhaust port noise of the brake valve is greater than a noise threshold. The instrument receives and displays the noise abnormality signal.

8. The commercial vehicle brake pedal force control system according to claim 7, characterized in that: The vehicle control unit is also used to determine whether the exhaust port noise monitored by the noise sensor remains unchanged during the displacement time change control of the brake pedal. If so, a noise sensor abnormality signal is generated, and the instrument receives and displays the noise sensor abnormality signal.

9. The commercial vehicle brake pedal force control system according to claim 7, characterized in that: The vehicle control unit is also used to determine whether the angular displacement of the brake pedal monitored by the angular displacement sensor remains unchanged during the displacement time change control of the brake pedal. If so, an angular displacement sensor abnormality signal is generated, and the instrument receives and displays the angular displacement sensor abnormality signal.

10. A vehicle, characterized in that: It comprises a commercial vehicle brake pedal force control system, which is the commercial vehicle brake pedal force control system according to any one of claims 1 to 9.

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