A control circuit and control method for an air bag type shock absorbing mechanism of a treadmill

Abstract

The present application relates to a kind of control circuit and control method of air bag type damping buffer mechanism of treadmill, by the design of the safety control circuit and control method, air bag pressure is continuously monitored, on the one hand, by controlling air bag pressure in the safe threshold range, on the other hand, when air bag is abnormally broken, the running machine is stopped by the hardware electronic circuit trigger running machine lower controller emergency stop running.The runner will not fall due to the loss of air bag support of running platform and be injured by the running belt, to eliminate potential safety hazards.At the same time, the present application can monitor running posture by the algorithm software built in the storage of single-chip microcomputer without increasing hardware cost, remind the runner to correct running posture, avoid knee injury and other sports injuries caused by long-term running posture error.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fitness equipment, and particularly relates to a control circuit and control method of an air bag type damping and buffering mechanism of a treadmill. BACKGROUND

[0002] Treadmills are commonly used fitness equipment and are widely used in family and commercial fitness places. In order to reduce the impact force of the running platform, especially to adjust the damping and buffering elasticity of the running platform, more and more treadmills use air bags as the elastic functional support components of the running platform running board.

[0003] However, the existing public technologies do not consider that the runner will fall down due to the loss of air bag support of the running platform when the air bag is abnormally broken, especially in the case of high speed, which is more dangerous. Such air bag damping and buffering mechanism has a major safety hazard.

[0004] For example, Chinese invention patent application publication No. CN 113018766 A “Treadmill with self-adjusting running board hardness” invention includes a frame, a running board body and an air bag. The running board body is installed on the frame, and the air bag is provided on the frame. The top of the air bag abuts against the running board body. It also includes a subsidence monitor for monitoring the subsidence amplitude of the running board body and an infrared light emitting tube. According to the monitoring data of the subsidence monitor, the hardness of the running board body is adjusted by adjusting the air pressure of the air bag. This patent only considers automatically adjusting the air pressure of the air bag according to the detected subsidence amplitude to achieve self-adjusting running board hardness. However, the infrared emitting and receiving tube is easily covered by dust and fails to function normally, which cannot control the air pressure of the air bag normally. Moreover, this patent does not consider the safety hazard caused by abnormal rupture of the air bag.

[0005] For another example, Chinese invention patent application publication No. CN 113663285 A “Treadmill with damping function and self-adaptive adjustment method for damping performance” includes a running platform chassis and a running board provided on the running platform chassis. A damping device is provided between the running board and the running platform chassis. The damping device includes a mounting seat provided on the running platform chassis and an air bag provided in the mounting seat. The top surface of the air bag abuts or gap cooperates with the lower bottom surface of the running board. The running platform chassis is provided with a gas pressure sensor and a gas pump in communication with the inside of the air bag. The air bag is provided with a control valve. The running platform chassis is provided with a control system signal connected with the gas pump, the control valve and the gas pressure sensor. This patent also mainly detects the air pressure of the air bag and automatically adjusts the air pressure of the air bag to adapt to the weight loss function. However, this patent also does not consider the safety hazard caused by the rupture of the air bag.

[0006] The running machine with the air bag type damping and buffering mechanism can indeed achieve good damping and buffering effect by adjusting the air pressure of the air bag, improve the running comfort, and reduce the impact on the knee. However, due to the continuous impact of the air bag during running, abnormal conditions such as air pressure regulation out of control, air bag aging, or collision of sharp foreign objects may cause air bag rupture. After the air bag ruptures, the running platform loses an important support part, which may easily cause the runner to fall, especially when the running belt runs at high speed. The existing technology cannot solve this problem.

[0007] On the other hand, as more and more people run on the running machine for exercise, many people will suffer from knee injuries and other sports injuries due to long-term incorrect running posture, such as left and right foot landing or body left and right swing imbalance, or too high emptying causing too large recoil force, etc. At present, the running posture monitoring and correction is mainly by hanging a running posture sensor on the shoes or waist, but the external hanging device is not convenient to use, and the hanging method is also incorrect, which affects the monitoring accuracy. In addition, although some professional sports running machines use multiple cameras to monitor the running posture from multiple angles, the cost is very high, and it is difficult to popularize to the general public. Therefore, the present scheme is produced. SUMMARY

[0008] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a control circuit and control method for an air bag type damping and buffering mechanism of a running machine. On the one hand, it can monitor the running machine operation and stop the running machine operation when abnormal, and on the other hand, it can detect the user's running posture and guide the user to run correctly.

[0009] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a control circuit for an air bag type damping and buffering mechanism of a running machine, comprising a running machine main system, a left air bag pressure sensor, a right air bag pressure sensor, a left air pressure electric signal amplifier, a right air pressure electric signal amplifier, and a control system; the left air bag pressure sensor is electrically connected with the left air pressure electric signal amplifier, the right air bag pressure sensor is electrically connected with the right air pressure electric signal amplifier, the control system is electrically connected with the left air bag pressure sensor, the right air bag pressure sensor, the left air pressure electric signal amplifier, and the right air pressure electric signal amplifier, and the control system is electrically connected with the running machine main system.

[0010] Further, the control circuit further comprises a single-chip microcomputer, a left analog-to-digital converter, a right analog-to-digital converter, a gas pump driver, a gas pump motor, a left inlet and outlet electric valve module, and a right inlet and outlet electric valve module. The left analog-to-digital converter is electrically connected with the left gas pressure electric signal amplifier, and the left analog-to-digital converter is electrically connected with the single-chip microcomputer. The right analog-to-digital converter is electrically connected with the right gas pressure electric signal amplifier, and the right analog-to-digital converter is electrically connected with the single-chip microcomputer. The single-chip microcomputer is electrically connected with the gas pump driver, and the gas pump driver is electrically connected with the gas pump motor. The single-chip microcomputer is electrically connected with the treadmill main system.

[0011] Further, the single-chip microcomputer is internally provided with a storage medium, the storage medium stores a running posture monitoring algorithm software code module, and the storage medium comprises a running emptying time algorithm module related to foot landing and body swing posture, a running landing time module, a left-right balance ratio algorithm module, a running step number and step frequency algorithm module, and a step length algorithm module.

[0012] A control method of an air bag type damping and buffering mechanism of a treadmill, comprising the following steps:

[0013] S1. Under normal standby or normal operation of the treadmill, the control system outputs a preset level signal, and the treadmill main system is not triggered to act.

[0014] S2. The electrical signal of the air bag pressure sensor is detected to determine whether the treadmill is normal.

[0015] S3. When the air bag pressure sensor senses a low pressure electrical signal, the treadmill stops.

[0016] Further, the specific steps of step S1 are as follows: under the condition that the treadmill is in standby or a user is running, the air bag pressure changes with the foot lifting and landing, the control system outputs a preset level signal, and the action of the treadmill main system is not triggered.

[0017] Further, the specific steps of steps S2 and S3 are as follows: when the user causes a too large foot landing impact force exceeding the upper limit of the air bag pressure or the air bag is damaged, the corresponding air bag pressure rapidly decreases, the left air bag pressure sensor or the right air bag pressure sensor senses a very low pressure electrical signal, the corresponding electrical signal triggers the corresponding gas pressure electric signal amplifier to output a reverse level signal, the reverse level signal is input to the control system, the control system outputs the reverse level signal, the running main motor driving circuit power supply of the treadmill main system is triggered to be turned off, the running of the running belt is stopped, and it is ensured that the user will not be thrown out by the running running belt and be injured.

[0018] Further, the step S2 detects whether the running posture of the runner is normal through the built-in storage medium of the single-chip microcomputer, the built-in storage medium of the single-chip microcomputer stores a landing mode monitoring algorithm software code module, the landing mode monitoring algorithm software code module judges the landing mode according to the left air bag pressure value and the right air bag pressure value change waveform corresponding to the process of collecting the left foot and the right foot landing, and the landing mode is three kinds of forefoot landing, full foot landing and heel landing.

[0019] 1. Compared with the prior art, the present application has the following beneficial effects: the present application continuously monitors the air bag pressure through the design of the control system, on the one hand, the air bag pressure is controlled within a safe threshold range, and on the other hand, when the air bag is abnormally broken, the left air bag pressure sensor, the right air bag pressure sensor, the left air pressure electric signal amplifier and the right air pressure electric signal amplifier cooperate, the air bag pressure sensor and the electric signal amplifier of the corresponding damaged part generate an electric signal to the control system, so that the control system generates an electric signal to the treadmill main system, the treadmill main system stops the operation of the treadmill in an emergency, and ensures that the runner will not fall down due to the loss of air bag support of the running platform, so as to eliminate the safety hazard.

[0020] 2. Without increasing the hardware cost, the algorithm software built in the single-chip microcomputer storage is used to monitor the running posture, remind the runner to correct the running posture, and avoid the sports injury caused by long-term running posture error. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a circuit principle structure diagram of the control circuit in the present application;

[0022] Figure 2 It is a curve diagram of forefoot landing in the present application;

[0023] Figure 3 It is a curve diagram of full foot landing in the present application;

[0024] Figure 4 It is a curve diagram of heel landing in the present application.

[0025] Marked in the figure: 1, treadmill main system; 2, left air bag pressure sensor; 3, right air bag pressure sensor; 4, left air pressure electric signal amplifier; 5, right air pressure electric signal amplifier; 6, control system; 7, single-chip microcomputer; 8, left analog-to-digital converter; 81, right analog-to-digital converter; 9, air pump driver; 91, air pump motor; 10, left in-out electric valve module; 101, right in-out electric valve module. DETAILED DESCRIPTION

[0026] In order to make the above features and advantages of the present application more obvious and easy to understand, the following specific examples are described in detail below, and the drawings are used as follows.

[0027] As Figures 1-4As shown, the embodiment provides a treadmill, including a treadmill body, a running belt, an air bag and a control circuit.

[0028] The running belt is installed in the running area of the treadmill body, and the middle part of the running belt has a running plate. The air bag is in the shape of a rectangle or an ellipse, and is installed below the left and right sides of the running plate as partial support points of the running plate.

[0029] The control circuit includes a treadmill main system 1, a left air bag air pressure sensor 2, a right air bag air pressure sensor 3, a left air pressure electric signal amplifier 4, a right air pressure electric signal amplifier 5, a control system 6, a single-chip microcomputer 7, a left analog-to-digital converter 8, a right analog-to-digital converter 81, an air pump driver 9, an air pump motor 91, a left in-out electric valve module 10 and a right in-out electric valve module 101.

[0030] The left air bag air pressure sensor 2 is electrically connected with the left air pressure electric signal amplifier 4, the right air bag air pressure sensor 3 is electrically connected with the right air pressure electric signal amplifier 5, the control system 6 is electrically connected with the left air bag air pressure sensor 2, the right air bag air pressure sensor 3, the left air pressure electric signal amplifier 4 and the right air pressure electric signal amplifier 5, and the control system 6 is electrically connected with the treadmill main system 1.

[0031] The treadmill main system 1 is used for controlling the start and stop of the main motor of the running belt of the treadmill, the left analog-to-digital converter 8 is electrically connected with the left air pressure electric signal amplifier 4, and the left analog-to-digital converter 8 is electrically connected with the single-chip microcomputer 7; the right analog-to-digital converter 81 is electrically connected with the right air pressure electric signal amplifier 5, and the right analog-to-digital converter 81 is electrically connected with the single-chip microcomputer 7; the single-chip microcomputer 7 is electrically connected with the air pump driver 9, the air pump driver 9 is electrically connected with the air pump motor 91; the air pump motor 91 is in communication with the air bag, and the single-chip microcomputer 7 is electrically connected with the treadmill main system 1.

[0032] The single-chip microcomputer 7 is built-in with a storage medium, the storage medium of the single-chip microcomputer 7 stores a running posture monitoring algorithm software code module, and the storage medium includes a running emptying time algorithm module related to foot landing and body swinging posture, a running landing time module, a left-right balance proportion algorithm module, a running step number and step frequency algorithm module, and a step length algorithm module.

[0033] The running posture monitoring algorithm software code module is built-in with an air bag air pressure threshold value, which is used to judge the off-ground emptying and landing state and time length, and the algorithm is as follows:

[0034] The upper threshold value is P_threshold_high and the lower threshold value is P_threshold_low.

[0035] Before the running machine starts to run, the upper threshold value and the lower threshold value are detected, calibrated and corrected.

[0036] Suppose that the n-th left air bag air pressure value in the running process is P_left_n.

[0037] The n-th right airbag pressure value is: P_right_n.

[0038] When: P_left_n < P_threshold_low.

[0039] Record the left foot off the ground time: t_left_awayn.

[0040] The left foot off the ground airbag pressure: P_left_away_n = P_left_n.

[0041] And set the left foot status flag to 1, that is, the off the ground state: Left_foot_status = 1.

[0042] When: P_right_n < P_threshold_low.

[0043] Record the right foot off the ground time: t_right_awayn.

[0044] The right foot off the ground airbag pressure: P_right_away_n = P_right_n.

[0045] And set the right foot status flag to 1, that is, the off the ground state: right_foot_status = 1.

[0046] When: P_left_n > P_threshold_high and Left_foot_status = 1.

[0047] Record the left foot touch time: t_left_touchn.

[0048] The left foot touch airbag pressure: P_left_touch_n = P_left_n.

[0049] And set the left foot status flag to 0, that is, the touch state: Left_foot_status = 0.

[0050] When: P_right_n > P_threshold_high and right_foot_status = 1.

[0051] Record the right foot touch time: t_right_touchn.

[0052] The right foot touch airbag pressure: P_right_touch_n = P_right_n.

[0053] And set the right foot status flag to 0, that is, the touch state: right_foot_status = 0.

[0054] The running flight time algorithm module includes: each left foot flight time, each right foot flight time, and total average left foot flight time, total average right foot flight time, and each right foot driving double foot flight time, total average right foot driving double foot flight time, each left foot driving double foot flight time, total average left foot driving double foot flight time calculation, the algorithm is: (touch refers to the foot falls down to contact the running belt, and passes through the running belt to impact the running plate, and then passes through the running plate to transmit the impact force to the air bags below the running plate left and right)

[0055] The nth left foot flight time is:

[0056] T_left_awayn=t_left_touchn-t_left_awayn.

[0057] The nth right foot flight time is calculated:

[0058] T_rightt_awayn=t_right_touchn-t_right_awayn.

[0059] The total average left foot flight time is:

[0060]

[0061] The total average right foot flight time is:

[0062]

[0063] The nth double foot flight time

[0064] In the case of left foot in front: when t_left_touchn>t_right_awayn.

[0065] The nth double foot flight time driven by the right foot:

[0066] T_body_away_1n=t_left_touchn-t_right_awayn.

[0067] The total average right foot driving double foot flight time

[0068]

[0069] In the case of right foot in front: when t_right_touchn>t_left_awayn.

[0070] The nth double foot flight time driven by the left foot:

[0071] T_body_away_2n = t_right_touchn - t_left_awayn.

[0072] Total average left foot drive both feet off the ground length

[0073]

[0074] Run touch down length algorithm module includes: each left foot touch down length, each right foot touch down length, total average left foot touch down length, total average right foot touch down length calculation, its algorithm is:

[0075] The nth left foot touch down length:

[0076] T_left_touchn = t_left_awayn+1 - t_left_touchn.

[0077] Total average left foot touch down length:

[0078]

[0079] The nth right foot touch down length:

[0080] T_right_touchn = t_right_awayn+1 - t_right_touchn.

[0081] Total average right foot touch down length:

[0082]

[0083] Left and right balance ratio algorithm module includes total average left and right touch down length balance ratio and total average left and right touch down impact balance ratio calculation, that is:

[0084] Total average left and right touch down length balance ratio, its algorithm is:

[0085] Left touch down length ratio: T_Balance_Ratio_left = T_left_touch / (T_left_touch+T_right_touch)*100%.

[0086] Right touch down length ratio: T_Balance_Ratio_right = T_right_touch / (T_left_touch+T_right_touch)*100%.

[0087] The nth left foot touch down impact force: F_left_touch_n = P_left_touch_n - P_left_away_n.

[0088] Total average left foot touch impact force:

[0089]

[0090] The nth right foot touch impact force: F_right_touch_n = P_right_touch_n - P_right_away_n.

[0091] Total average right touch impact force:

[0092]

[0093] The total average left and right touch impact force balance ratio is calculated as follows:

[0094] The left foot touch impact force ratio: F_Balance_Ratio_left = F_left_touch / (F_left_touch + F_right_touch).

[0095] The right foot touch impact force ratio: F_Balance_Ratio_right = F_right_touch / (F_left_touch + F_right_touch).

[0096] The running step count and cadence algorithm module is calculated as follows: step counter Step_counter, second accumulator Second_Timer.

[0097] When the treadmill is in standby mode, set the step counter Step_counter = 0.

[0098] After the treadmill is running, the second accumulator Second_Timer starts timing:

[0099] When the right foot status flag right_foot_status changes from 1 to 0, Step_counter + 1.

[0100] When the left foot status flag left_foot_status changes from 1 to 0, Step_counter + 1.

[0101] That is, the step count is: Step_counter.

[0102] The average cadence is: Cadence = Step_counter / (Second_Timer / 60).

[0103] The scheme adopts the above structure and provides a control method for the air bag type damping and buffering mechanism of the treadmill, which includes the following steps:

[0104] S1, under normal standby or normal operation of the treadmill, the control system 6 outputs a preset level signal, and the treadmill main system 1 does not trigger action; the specific steps of step S1 are as follows: under the condition that the treadmill is in standby or a user is running, the air bag air pressure changes with the foot lifting and falling, the control system 6 outputs a preset level signal, and the action of the treadmill main system 1 is not triggered.

[0105] S2, the air bag air pressure sensor is used to judge whether the treadmill is normal.

[0106] S3, when the air bag air pressure sensor senses a low air pressure electric signal, the treadmill stops.

[0107] The specific steps of step S2 and step S3 are as follows: when the user causes the foot impact force to be too large to exceed the upper limit of the air bag air pressure or the air bag is damaged, the corresponding air bag air pressure rapidly decreases, the left air bag air pressure sensor 2 or the right air bag air pressure sensor 3 senses a very low air pressure electric signal, the corresponding electric signal triggers the corresponding air pressure electric signal amplifier to output a reverse level signal, the reverse level signal is input to the control system 6, the control system 6 outputs the reverse level signal, triggers the running of the treadmill main system 1 to stop the running of the treadmill main motor drive circuit power supply, and ensures that the user will not be thrown out by the running of the running belt and be injured.

[0108] In step S2, whether the treadmill is normal is detected by the single-chip microcomputer 7 built-in storage medium, the single-chip microcomputer 7 built-in storage medium stores a running landing mode monitoring algorithm software code module, the running landing mode monitoring algorithm software code module judges the landing mode according to the change waveform of the left air bag air pressure value and the right air bag air pressure value collected when the left foot and the right foot land, and the landing mode is three kinds of forefoot landing, full foot landing and heel landing, as shown in Figures 2-4 .

[0109] The basic principles and main features of the present application and the advantages of the present application are shown and described above, and those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application, and the scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A control method of an air bag type shock absorbing mechanism of a treadmill, characterized by: The method comprises the following steps: S1, under normal standby or normal operation of the treadmill, the control system outputs a preset level signal, and the main system of the treadmill does not trigger action; S2, whether the treadmill is normal is detected by detecting the electrical signal of the air bag pressure sensor; S3, when the air bag pressure sensor senses a low pressure electrical signal, the treadmill stops; The control circuit comprises a main system of the treadmill, a left air bag pressure sensor, a right air bag pressure sensor, a left air pressure electrical signal amplifier, a right air pressure electrical signal amplifier, and a control system; the left air bag pressure sensor is electrically connected with the left air pressure electrical signal amplifier; the right air bag pressure sensor is electrically connected with the right air pressure electrical signal amplifier; the control system is electrically connected with the left air bag pressure sensor, the right air bag pressure sensor, the left air pressure electrical signal amplifier, and the right air pressure electrical signal amplifier; and the control system is electrically connected with the main system of the treadmill. The specific steps of step S1 are as follows: under the condition that the treadmill is in standby or a user is running, the air bag pressure changes with the footstep rising and falling, the control system outputs a preset level signal, and the action of the main system of the treadmill is not triggered. The specific steps of steps S2 and S3 are as follows: when the user causes a too large footstep impact force to exceed the upper limit of the air bag pressure or the air bag is damaged, the corresponding air bag pressure rapidly decreases, the left air bag pressure sensor or the right air bag pressure sensor senses a very low pressure electrical signal, the corresponding electrical signal triggers the corresponding air pressure electrical signal amplifier to output a reverse level signal, the reverse level signal is input to the control system, the control system outputs the reverse level signal, the main motor driving circuit power supply of the main system of the treadmill is triggered to be turned off, the running of the running belt is stopped, and it is ensured that the user will not be thrown out by the running running belt and be injured.

2. The control method of the air bag type damping and buffering mechanism of a treadmill according to claim 1, characterized in that: In step S2, whether the treadmill is normal is detected by a single-chip microcomputer built-in storage medium; the single-chip microcomputer built-in storage medium stores a running landing mode monitoring algorithm software code module; the running landing mode monitoring algorithm software code module judges the landing mode according to the change waveform of the left air bag pressure value and the right air bag pressure value collected during the landing of the left foot and the right foot; and the landing mode is three modes of forefoot landing, full-foot landing, and heel landing.

3. The control method of the air bag type damping and buffering mechanism of a treadmill according to claim 1, characterized in that: The control circuit further comprises a single-chip microcomputer, a left analog-to-digital converter, a right analog-to-digital converter, an air pump driver, an air pump motor, a left in-out electrical valve module, and a right in-out electrical valve module; the left analog-to-digital converter is electrically connected with the left air pressure electrical signal amplifier; the left analog-to-digital converter is electrically connected with the single-chip microcomputer; the right analog-to-digital converter is electrically connected with the right air pressure electrical signal amplifier; the right analog-to-digital converter is electrically connected with the single-chip microcomputer; the single-chip microcomputer is electrically connected with the air pump driver; the air pump driver is electrically connected with the air pump motor; and the single-chip microcomputer is electrically connected with the main system of the treadmill.

4. The control method of the air bag type shock absorbing mechanism of a treadmill according to claim 3, characterized by: The single-chip microcomputer built-in storage medium stores a running posture monitoring algorithm software code module; the storage medium comprises a running emptying time algorithm module related to footstep landing and body swing posture, a running landing time module, a left-right balance proportion algorithm module, a running step number and step frequency algorithm module, and a step length algorithm module.

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