CN102401711A - Bicycle ergometer with sensor mounted on bicycle frame - Google Patents
Bicycle ergometer with sensor mounted on bicycle frame Download PDFInfo
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- CN102401711A CN102401711A CN2010102906690A CN201010290669A CN102401711A CN 102401711 A CN102401711 A CN 102401711A CN 2010102906690 A CN2010102906690 A CN 2010102906690A CN 201010290669 A CN201010290669 A CN 201010290669A CN 102401711 A CN102401711 A CN 102401711A
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Abstract
The invention provides a bicycle ergometer which is provided with a strainometer sensor component that is arranged on a relatively compressible part at the end part of a rear rod jaw of a bicycle frame , wherein the relatively compressible part is arranged next to a rear hub and bears the force applied by a bicycler on a crank set, and the force is transmitted to a hub through a chain and a sprocket wheel component; the sensor component comprises two tensile sensors which are in Ohm interconnection, wherein each sensor is provided with a first layer for bearing a variable resistor component and a second layer which is used for supporting the first layer, and the resistance of the variable resistor component changes with the displacement of the compressible part; and the sensor component is connected with another two resistors in a bridge circuit so as to generate signals standing for the applied force of the bicycler. The signals are processed together with the speed signals so as to generate power signals, and the power signals are provided to a display.
Description
Background of invention
The bicycle ergometer of the quantity of power of cost during the present invention relates to be used for indicating the cyclist to go for a drive.More specifically, the present invention relates to use the sensor of frame installation therefrom to confirm the bicycle ergometer of the electric signal of power to allow generation.
Bicycle ergometer is used as the aid of tentative training more and more by occupation and amateurish cyclist.Some different types of bicycle ergometers are available, and some of them use strainometer to measure the power that is put on crank group, bottom bracket and rear-wheel hub by the cyclist.When effectively providing sign to apply the electric signal of power, it is relatively costly using the known bicycle ergometer of strainometer, and more or less is difficult to install.Because these shortcomings, cyclist colony does not accept bicycle ergometer widely.
Summary of the invention
The present invention includes the bicycle ergometer that uses one or more strain-gage pickup assemblies, this power meter is relatively cheap but the electric signal that characterizes cyclist's acting force effectively is provided, and these signals can combine with rate signal to produce the realtime power measurement.
Aspect the broadest, the present invention includes a kind of bicycle ergometer, have: back bicycle frame, said back bicycle frame has first fork arm, and said first fork arm has the compressible relatively rear portion near the zone of attachable wheel hub; And the strain-gage pickup assembly that is fixed in compressible relatively rear portion; Said strain-gage pickup assembly has first and second stretch sensor; Each sensor comprises the second layer that variable resistor element ground floor mounted thereto is arranged and be used to support ground floor, and the variable resistor element of first and second stretch sensor ohm each other connects to provide the total resistance value of representing cyclist's acting force.
Alternatively dispose first and second stretch sensor, each ground floor is in the face of relation, or each second layer is in the face of relation.
Bicycle ergometer also comprises: bridge diagram, said bridge diagram have and are connected first and second stretch sensor in first branch road and are connected a pair of fixed resistance in second branch road; Amplifier, said amplifier is coupled in bridge diagram, is used to amplify the signal of representing total resistance value; Analog-digital converter, said analog-digital converter is coupled in amplifier, is used for converting the signal output from amplifier to digital signal; Microcomputer, said microcomputer is coupled in analog-digital converter, is used for receiving digital signals and the bicycle speed signal that comes auto correlation bicycle speed meter, and with the conversion of signals success ratio signal that receives; And display, said display-coupled in microcomputer, be used for power signal is shown to the cyclist.
Can bicycle ergometer be configured to wired or wireless system.In wired system, all ohm interconnection of these unit.In wireless system, transmitter is coupled in microcomputer, in order to the received power signal and produce equivalent wireless signal; And the receiver that is coupled in display receives equivalent wireless signal, and equivalent wireless signal is offered display.
In alternate embodiment, back bicycle frame has second fork arm, and said second fork arm has the compressible relatively rear portion near the zone of attachable wheel hub; And additional strain-gage pickup assembly is fixed in this second compressible relatively rear portion.Additional strain flowmeter sensor assembly has third and fourth stretch sensor; Each sensor comprises the second layer that variable resistor element ground floor mounted thereto is arranged and be used to support ground floor, and the variable resistor element of third and fourth stretch sensor ohm each other connects to provide the total resistance value of representing cyclist's acting force.
Alternatively dispose third and fourth stretch sensor each ground floor is in the face of relation, or each second layer is in the face of relation.
In this alternate embodiment, third and fourth stretch sensor is connected in second branch road of bridge diagram.
The present invention greatly helps bicycle ergometer brought in the rear fork end of bicycle frame and has in any bicycle of relative compressible structure part.Whole dynamometer systems, or be the strain-gage pickup assembly, can easily be fixed in the parts of bicycle during fabrication.Equally, total system can be fixed in bicycle in any link of distribution chain, for example selects as additional in retailer's link.The cyclist also can be appended to bicycle with quite low cost and low workload with the Cycle Power meter systems after purchase.
For a more complete understanding of the characteristics of the present invention and advantage, should be with reference to accompanying drawing together with detailed description.
Description of drawings
Fig. 1 is the fragmentary, perspective view of observing out from bicycle afer bay top, and it illustrates the strain-gage pickup assembly of fork arm end, wheel hub, chain and first embodiment of the invention;
Fig. 2 is the front view that the cutting line A-A along Fig. 1 obtains, and the installation site of strain-gage pickup assembly on the compressible portion inside surface of right back fork arm is shown;
Fig. 3 is to use the block scheme of the bicycle ergometer unit of the single strain-gage pickup assembly that is configured to wired unit;
Fig. 4 is to use the block scheme of the bicycle ergometer unit of the single strain-gage pickup assembly that is configured to radio-cell;
Fig. 5 is the synoptic diagram that the single strain-gage pickup that is in three sensor in different positions is shown;
Fig. 6 is the synoptic diagram of first embodiment of dual-element strain-gage pickup assembly;
Fig. 7 is the synoptic diagram of second embodiment of dual-element strain-gage pickup assembly;
Fig. 8 is observable fragmentary, perspective view from bicycle afer bay top, the strain-gage pickup assembly that it illustrates fork arm end, wheel hub, chain and has the second embodiment of the invention of two independent strain-gage pickup assemblies;
Fig. 9 is the front view that the cutting line B-B along Fig. 8 obtains, and second installation site of strain-gage pickup assembly on the inside surface of the compressible portion of left back fork arm is shown;
Figure 10 is to use the block scheme of the bicycle ergometer unit of two strain-gage pickup assemblies that are configured to wired unit;
Figure 11 is to use the block scheme of the bicycle ergometer unit of two strain-gage pickup assemblies that are configured to radio-cell;
Figure 12 illustrates the synoptic diagram of cyclist's power with respect to crank group angle change in location.
The detailed description of preferred embodiment
Turn to accompanying drawing now, Fig. 1 is the fragmentary, perspective view of observing out from bicycle afer bay top, and it illustrates the strain-gage pickup assembly of fork arm end, wheel hub, chain and first embodiment of the invention.As shown in the figure, the bicycle afer bay has a pair of terminal part that is called right fork arm 12 and left fork arm 14.Be fixed on fork arm 12, be rear-wheel hub 20 and chain wheel assembly 22 between 14 by wheel shaft 16 and stop nut 17.Each sprocket wheel that chain drive-belt 24 twines through constituting chain wheel assembly 22 provides rotatablely moving of wheel hub 20 with the acting force by bike that responds the cyclist.
The end 26,28 of each fork arm 12,14 has the thinner transverse gage size of being left than each fork arm 12,14 of major part.Be fixed in right fork arm 12 ends 26 inside surface be the following assembly of strain-gage pickup in greater detail 30.As Fig. 2 is the clearest illustrate, strain-gage pickup assembly 30 is attached to the thin former part 32 of stretching out along right fork arm 12 ends 26.Compare the more tough structure of right back fork arm 12; Former part 32 has compressible relatively engineering properties, so the physical size of strain-gage pickup assembly 30 can change along with the different power sizes that put on former part 32 through chain 24, chain wheel assembly 22 and wheel shaft 16.Fig. 5 illustrates to have along with the linear length travel of the sensor body simple extension sensor 40 with the Ohmage characteristic of measurable quantitative changeization.Stretch sensor 40 has: the ground floor 42 that thin variable resistor element 43 is installed above that; And the carrying ground floor also provides second bottom 44 of additional mechanical intensity for sensor 40.The resistance value of sensor 40 depends on the length travel of sensor body.As shown in Figure 5, when sensor 40 along first direction during at a direction (being illustrated as the deflection direction) top offset, resistance value increases (R+r), wherein R is the static resistance value of sensor 40 and r is because along the additional electrical resistance of first direction displacement.Equally, when sensor 40 in opposite direction during displacement, resistance value reduces (R-r).
Fig. 6 illustrates the strain-gage pickup assembly 30 of bringing the type in the power meter structure illustrated in figures 1 and 2 into.As shown in the figure, sensor module 30 comprise have ground floor 42a, 42b and second layer 44a, two double-deck stretch sensor 40a of 44b, 40b.Stretch sensor 40a, 40b are furnished with (R+r), (R-r) relation ground floor 42a respect to one another, 42b.Along with the power displacement of sensor module 30 because of the former 32 that puts on right back fork arm 12, the all-in resistance equivalent of each stretch sensor and changing in opposite direction.
Fig. 7 illustrates the alternative strain-gage pickup assembly 50 of the type of including power meter structure illustrated in figures 1 and 2 in.As shown in the figure, sensor module 50 comprise have ground floor 42a, 42b and second layer 44a, two double-deck stretch sensor 40a of 44b, 40b.Stretch sensor 40a, 40b are furnished with (R-r), (R+r) relation second layer 44a respect to one another, 44b.Along with the power displacement of sensor module 50 because of the former 32 that puts on right back fork arm 12, the all-in resistance equivalent of each stretch sensor and changing in opposite direction.
Fig. 3 is to use the block scheme of the bicycle ergometer of the single strain-gage pickup assembly that is configured to wired unit.As shown in the figure, the stretch sensor 40a, the 40b that comprise strain- gage pickup assembly 30 or 50 are connected in a pair of fixed resistance 52,54 with known wheatstone bridge circuits structure.The top node of electric bridge is connected in battery-powered emf source Vc.The bottom node of electric bridge is connected in the circuit ground point.Right node is connected in an end of fixed resistance 52,54 and serves as an output terminal of bridge diagram.Second end of fixed resistance 52 is connected in the end of stretch sensor 40a and is connected in supply voltage Vc.Second end of fixed resistance 54 is connected in an end and the circuit ground point of stretch sensor 40b.The other end of stretch sensor 40a, 40b links together and serves as another output terminal of bridge diagram.
The bridge diagram output terminal is coupled in the input end of amplifier 55, and wherein the electric bridge signal is exaggerated.Amplifier 55 is preferably the MAX4197 type unit of buying from MAXIM company.Be coupled in the input end of analog-digital converter 56 from the amplifying signal of amplifier 55 output, this analog-digital converter 56 becomes the analog signal conversion of amplifying the digital signal of equivalence.Be coupled in the input port of microcomputer 58 from the digital signal output of analog-digital converter 56.In PIC 16F73 type unit, preferably make up analog-digital converter 56 and microcomputer 58 from Microchip company.Rate signal from bicycle speed meter (not shown) also is coupled in microcomputer 58.Microcomputer 58 uses algorithm known processing force signal and rate signal so that the watt level signal to be provided.The watt level signal is coupled in multifunction display 60, and this multifunction display 60 shows the current power value with the readable form of cyclist.In Fig. 3 embodiment, these unit are coupled through the ohm line connection.
Fig. 4 is to use the block scheme of the bicycle ergometer unit of the single strain-gage pickup assembly that is configured to radio-cell.In the figure, with same reference numerals represent with Fig. 3 system in the similar elements corresponding elements.In Fig. 4 system, treated power signal is coupled in the input end that is positioned near the r.f transmitter 62 the sensor module 30 (50).Transmitter 62 sends near the receiver 64 that is positioned at the multifunction display 60 with power signal, and this receiver 64 offers multifunction display 60 with these signals.
Fig. 8 is observable fragmentary, perspective view from bicycle afer bay top, the strain-gage pickup assembly that it illustrates fork arm end, wheel hub, chain and has the second embodiment of the invention of two independent strain-gage pickup assemblies.In the accompanying drawings, represent element corresponding elements same as shown in Figure 1, except representing the sensor module 30 with Reference numeral 30a with same reference numerals.The second strain-gage pickup assembly 30b is fixed in the inside surface of the end 28 of left fork arm 14.Sensor module 30b has the 26S Proteasome Structure and Function identical with aforementioned sensor components 30.Like the clearest illustrating among Fig. 9, strain-ga(u)ge pickup assembly 30b is attached to the thin former part 33 of extending along the end 28 of left fork arm 14.Compare the more tough structure of left back fork arm 14; Former part 33 has compressible relatively engineering properties, so the physical size of strain-gage pickup assembly 30b can change along with the different power sizes that put on former part 32 through chain 24, chain wheel assembly 22 and wheel shaft 16.
Figure 10 is to use the block scheme of the bicycle ergometer unit of two strain-gage pickup assembly 30a being configured to wired unit, 30b.Figure 11 is to use the block scheme of the bicycle ergometer unit of two strain-gage pickup assembly 30a being configured to radio-cell, 30b.Figure 10 and the main element shown in Figure 11 are identical with Fig. 3 and those elements shown in Figure 4 basically, except the structure of bridge diagram.In Figure 10 and Figure 11, replace fixed resistance 52,54 by each the stretch sensor 40a that comprises the second sensor module 30b, 40b, its electrical connection is as shown in the figure.Therefore, electric bridge comprises four independent variable resistor stretch sensor 40.
In use, when the cyclist forces in bicycle pedal, monitor the size of power and convert thereof into the visual power shows signal that supplies the cyclist to observe through bridge diagram.Figure 12 illustrates the synoptic diagram of cyclist's power with respect to crank group angle change in location.In the position (a), pedal is level basically, and the cyclist is just through applying maximum power at front running board.In the position (b), pedal is vertical basically, and the cyclist is just applying minimum power.In the position (c), pedal is basic horizontal once more, and the cyclist is just through applying maximum power at front running board; And in the position (d), pedal is vertical basically once more, and the cyclist applies minimum power.
Be clear that very much now, all having superiority aspect cost and the installation convenience than the known bicycle ergometer that uses strainometer according to cyclist's power meter of theory manufacturing of the present invention.At first, these strainometers for be installed near the rear-wheel hub to have on the thin former part of relative compressibility be simple relatively.Can accomplish this installation (the for example retailer or the user-cyclist) Anywhere of Bicycle Plant or business chain.In addition, the wired or wireless pattern of the configurable one-tenth of bicycle ergometer that theory is made according to the present invention, this has given great dirigibility in installation process.In addition, through adopting two-layer two strainometer assemblies, obtain to be superior to the bigger sensitivity of single strainometer design.At last, through adopting four strain gauge structures shown in Fig. 8-11, can obtain high sensitivity to the temperature variation that runs in the process by bike.
Although invention has been described with reference to specific embodiment, but still can not break away from the present invention and adopt alternate configurations and equivalent spiritually.For example, although disclosed some circuit component, yet also can adopt other equivalent unit as requested.Therefore, foregoing should not be construed to qualification the present invention, and the present invention is limited appended claims.
Claims (10)
1. bicycle ergometer comprises:
Back bicycle frame, said back bicycle frame has first fork arm, and said first fork arm has the compressible relatively rear portion near the zone of attachable wheel hub; And
Be fixed in the strain-gage pickup assembly at said compressible relatively rear portion; Said strain-gage pickup assembly has first and second stretch sensor; Each sensor comprises the second layer that variable resistor element ground floor mounted thereto is arranged and be used to support said ground floor, and the variable resistor element of said first and second stretch sensor ohm each other connects to provide the total resistance value of representing cyclist's acting force.
2. invention as claimed in claim 1 is characterized in that, said first and second stretch sensor are configured to make each said ground floor to be in the face of relation.
3. invention as claimed in claim 1 is characterized in that, said first and second stretch sensor are configured to make each said second layer to be in the face of relation.
4. invention as claimed in claim 1 is characterized in that, also comprises: it is right that bridge diagram, said bridge diagram have the fixed resistance that is connected said first and second stretch sensor in first branch road and is connected in second branch road; Amplifier, said amplifier is coupled in said bridge diagram, is used to amplify the signal of the said total resistance value of representative; Analog-digital converter, said analog-digital converter is coupled in said amplifier, is used for the conversion of signals from said amplifier output is become digital signal; Microcomputer, said microcomputer is coupled in said analog-digital converter, the bicycle speed signal that is used to receive said digital signal He comes the bicycle speed meter of auto correlation, and with the conversion of signals success ratio signal that receives; And display, said display-coupled in said microcomputer, be used for said power signal is shown to the cyclist.
5. invention as claimed in claim 4 is characterized in that, also comprises transmitter, and said transmitter is coupled in said microcomputer, in order to receiving said power signal, and produces equivalent wireless signal; And receiver, said receiver has output, and said output is coupled in said display, and said receiver is in order to receive said equivalent wireless signal and said equivalent wireless signal is offered said display.
6. invention as claimed in claim 1 is characterized in that, said back bicycle frame has second fork arm, and said second fork arm has the second compressible relatively rear portion near the zone of attachable wheel hub; And the additional strain flowmeter sensor assembly that is fixed in the said second compressible relatively rear portion; Said additional strain flowmeter sensor assembly has third and fourth stretch sensor; Each sensor comprises the second layer that variable resistor element ground floor mounted thereto is arranged and be used to support said ground floor, and the said variable resistor element of said third and fourth stretch sensor ohm each other connects to provide the total resistance value of representing cyclist's acting force.
7. invention as claimed in claim 6 is characterized in that, said third and fourth stretch sensor is configured to make each said ground floor to be in the face of relation.
8. invention as claimed in claim 6 is characterized in that, said third and fourth stretch sensor is configured to make each said second layer to be in the face of relation.
9. invention as claimed in claim 6 is characterized in that, also comprises: bridge diagram, said bridge diagram have and are connected said first and second stretch sensor in first branch road and are connected said third and fourth stretch sensor in second branch road; Amplifier, said amplifier is coupled in said bridge diagram, is used to amplify the signal of the said total resistance value of representative; Analog-digital converter, said analog-digital converter is coupled in said amplifier, is used for the conversion of signals from said amplifier output is become digital signal; Microcomputer, said microcomputer is coupled in said analog-digital converter, is used to receive the bicycle speed signal of said digital signal and the bicycle speed meter that comes auto correlation and with the conversion of signals success ratio signal that receives; And display, said display-coupled in said microcomputer, be used for said power signal is shown to the cyclist.
10. invention as claimed in claim 9 is characterized in that, also comprises: be coupled in the transmitter of said microcomputer, in order to receive said power signal and to generate equivalent wireless signal; And the receiver with the output that is coupled in said display, in order to receive said equivalent wireless signal and said equivalent wireless signal offered said display.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010290669.0A CN102401711B (en) | 2010-09-16 | 2010-09-16 | Bicycle ergometer with sensor mounted on bicycle frame |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010290669.0A CN102401711B (en) | 2010-09-16 | 2010-09-16 | Bicycle ergometer with sensor mounted on bicycle frame |
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| CN102401711A true CN102401711A (en) | 2012-04-04 |
| CN102401711B CN102401711B (en) | 2014-11-26 |
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| CN201010290669.0A Expired - Fee Related CN102401711B (en) | 2010-09-16 | 2010-09-16 | Bicycle ergometer with sensor mounted on bicycle frame |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106323517A (en) * | 2015-07-08 | 2017-01-11 | 吉首大学 | Bicycle outdoor riding test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106323517A (en) * | 2015-07-08 | 2017-01-11 | 吉首大学 | Bicycle outdoor riding test device |
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| CN102401711B (en) | 2014-11-26 |
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