CN102050109A - System and method for detecting and responding to the pressure loss in hydraulic automatic transmission - Google Patents
System and method for detecting and responding to the pressure loss in hydraulic automatic transmission Download PDFInfo
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Abstract
The invention relates to a system and method for detecting and responding to the pressure loss in a hydraulic automatic transmission. Specifically speaking, the control system of a hydraulic automatic transmission is provided and comprises a fault detection module and a transmission diagnostic module. The fault detection module detects the fault in the transmission components. The fault can indicate the low hydraulic fluid pressure or the failure of one or multiple components in the transmission. Based on the detected fault, the predetermined amount of fault and a plurality of conditions, the transmission diagnostic module determines whether the fault is caused by low hydraulic pressure.
Description
The cross reference of related application
The application requires in the rights and interests of the U.S. Provisional Patent Application 61/259,792 of submission on November 10th, 2009.Whole disclosures of above-mentioned patent application are incorporated this paper into by reference at this.
Technical field
The present invention relates to explosive motor, more particularly, relate to and a kind ofly be used for detecting the loss of pressure of hydraulic automatic transmission and it is made the system and method for response.
Background technology
The background technology explanation that this paper provided is the purpose that is used for presenting on the whole background of the present invention.Contriver's a part is operated in the background technology part and is described, this part content and when submit applications, do not constitute in addition in this description prior art aspect, both indeterminately also not impliedly admitted to be destruction prior art of the present invention.
Air/fuel (A/F) compound in the explosive motor combustion cylinder is with driven plunger.Piston rotates crankshaft revolution ground, thereby produces driving torque.Driving torque can be passed to the transmission system (for example, wheel) of vehicle via change-speed box.Driving torque also can transform (that is, being doubled) by a transmitting ratio in a plurality of transmitting ratios of change-speed box.Change-speed box can couple via tor-con (for example, hydraulic coupler) and bent axle.
Change-speed box can comprise valve (for example, spring-opposed valve), power-transfer clutch and one or more compound planet gear.Change-speed box also can comprise check ball and/or servomechanism.Servomechanism can activate one or more power-transfer clutchs, and power-transfer clutch can engage with the one or more gears in the compound planet gear.Change-speed box comprises the hydraulic fluid of one or more parts of controlling change-speed box.Hydraulic fluid offers change-speed box by the main pump in the tor-con usually.
Hydraulic fluid relies on the pressure of hydraulic fluid and flows through one or more valves (spring-opposed valve that for example, has different spring stiffnesss).Alternatively, valve can be activated by the electromechanical coupling system by peripheral control unit control.The also actuatable servomechanism of hydraulic fluid, with one or more clutch engagements.In addition, each power-transfer clutch can be corresponding with the gear in the compound planet gear.Therefore, hydraulic fluid can engage the one or more gears (by the combination of servomechanism and power-transfer clutch) in the compound planet gear, to obtain the transmitting ratio of expectation.
Summary of the invention
A kind of control system that is used for hydraulic automatic transmission, it comprises fault detection module and change-speed box diagnostic module.Fault detection module detects the fault of transmission components, and wherein fault can be indicated the low hydraulic fluid pressure in the change-speed box or the inefficacy of one or more parts.The change-speed box diagnostic module determines according to predetermined quantity and a plurality of condition (or situation) of detected fault, fault whether fault is because low hydraulic pressure causes.
A kind of method that is used for the modulated pressure automatic transmission with hydraulic torque converter, it comprises: detect the fault of transmission components, wherein fault can be indicated the low hydraulic fluid pressure in the change-speed box or the inefficacy of one or more parts; And, determine according to predetermined quantity and a plurality of condition of detected fault, fault whether fault is because low hydraulic pressure causes.
In other features, above-mentioned system and method is to implement by the computer program of being carried out by one or more treaters.Computer program may reside in the tangible computer-readable media, such as but not limited to memory device, non-volatile data memory and/or other suitable tangible storage mediums.
The present invention also provides following scheme:
1. 1 kinds of control system that are used for hydraulic automatic transmission of scheme comprise:
Fault detection module, it detects the fault of the parts of described change-speed box, and wherein, described fault can be indicated the low hydraulic fluid pressure in the described change-speed box or the inefficacy of the one or more parts in the described parts; And
The change-speed box diagnostic module, its predetermined quantity and a plurality of condition according to described detected fault, fault determines whether described fault is because low hydraulic pressure causes.
Scheme 2. is characterized in that as scheme 1 described control system described parts comprise valve, reverse gear pressure switch, throttle position sensor, engine speed sensor, gearbox output shaft speed sensor and turbo speed sensor.
Scheme 3. is as scheme 2 described control system, it is characterized in that, described fault detection module detects the fault of described valve according to the response of the integraty of described valve and described valve, wherein, the integraty of described valve is based on described valve when closing through the pressure drop of described valve, and wherein, the response of described valve is based on the delay between described valve of order and the described valve of actuating.
Scheme 4. is as scheme 2 described control system, it is characterized in that, described fault detection mould is determined and is detected the fault of described reverse gear pressure switch according to the integraty of described reverse gear pressure switch, wherein, the integraty of described reverse gear pressure switch comprises the state of described reverse gear pressure switch with respect to manual selector valve position.
Scheme 5. is characterized in that as scheme 2 described control system described fault detection module detects the indication that turbine trip speed suddenlys change according to the variation of tor-con turbine speed in the scheduled time slot, and wherein, described tor-con turbine couples mutually with described input shaft.
Scheme 6. is characterized in that as scheme 1 described control system the predetermined quantity of described fault is more than or equal to 2, and wherein, the fault of described predetermined quantity takes place in scheduled time slot.
Scheme 7. is as scheme 1 described control system, it is characterized in that, described a plurality of condition comprises more than first condition, and wherein, described change-speed box diagnostic module determines whether described more than first condition is true, wherein, when described more than first condition is true time, whether described change-speed box diagnostic module monitoring predetermined low hydraulic fault symptom has taken place, wherein, when detecting initial low hydraulic fault symptom, described change-speed box diagnostic module is waited for scheduled time slot, with the fault of detection with the corresponding predetermined quantity of scope of described more than first condition, and wherein, when detecting the fault of described predetermined quantity in described scheduled time slot, more than second condition is true.
Scheme 8. is as scheme 7 described control system, it is characterized in that, described more than first condition comprises first grade, the Transmission gear of neutral gear or reverse gear, engine speed, turbine trip speed, transmission output shaft speed and Throttle Position are respectively less than predetermined speed and position threshold, wherein, described more than second condition comprises that described primary fault is the symptom of low hydraulic pressure and described predetermined additional fault has taken place in described scheduled time slot, wherein, when described more than second condition is true time, detected low hydraulic pressure, and wherein,, then detected component failure when described more than second condition is not true time.
Scheme 9. is as scheme 8 described control system, it is characterized in that, when described more than second condition is not true time, described change-speed box diagnostic module produces Transmission malfunction, to indicate described detected fault is physical fault, and order change-speed box diagnostic response, and wherein, when described more than second condition is true time, the restorative neutral gear of the initial gear when having ordered and consider more than the 3rd condition specific to low hydraulic pressure.
Scheme 11. is as scheme 10 described control system, it is characterized in that, described more than the 3rd condition comprises that engine speed, turbine trip speed, transmission output shaft speed and Throttle Position are respectively greater than predetermined speed and position threshold, failure recovery, and the time quantum that begins from the detection of described low hydraulic pressure.
Scheme 13. is as scheme 12 described control system, it is characterized in that, one or more in described more than the 3rd condition are true time, described change-speed box diagnostic module has produced low hydraulic fault signal, wherein, stop wait, and wherein, ordered the Transmission gear that is suitable for described low hydraulics recovery from low main the pressure.
Scheme 14. is characterized in that as scheme 12 described control system described change-speed box diagnostic module does not produce low-voltage signal, because taken place to recover before producing low-voltage signal and described change-speed box restarts normal operation.
Scheme 15. is as scheme 12 described control system, it is characterized in that, described change-speed box diagnostic module produces low-voltage signal, wherein, before any in described more than the 3rd condition takes place valve takes place and recover, wherein, described change-speed box restarts normal operation, and wherein, use described low-voltage signal to write down temporary transient low hydraulic pressure, be used for further diagnosis.
16. 1 kinds of methods that are used for the modulated pressure automatic transmission with hydraulic torque converter of scheme comprise:
Detect the fault of the parts of described change-speed box, wherein, described fault can be indicated the inefficacy of one or more parts of low hydraulic fluid pressure in described change-speed box or described parts; And
Predetermined quantity and a plurality of condition according to described detected fault, fault determine whether described fault is because low hydraulic pressure causes.
Scheme 17. is characterized in that as scheme 16 described methods described parts comprise valve, reverse gear pressure switch, throttle position sensor, engine speed sensor, gearbox output shaft speed sensor and turbo speed sensor.
Scheme 19. is as scheme 17 described methods, also comprise the fault that detects described reverse gear pressure switch according to the integraty of described reverse gear pressure switch, wherein, the integraty of described reverse gear pressure switch comprises the state of described reverse gear pressure switch with respect to manual selector valve position.
Scheme 21. is characterized in that as scheme 16 described methods the predetermined quantity of described fault is more than or equal to 2, and wherein, the fault of predetermined quantity takes place in scheduled time slot.
Determine whether described more than first condition is true;
When described more than first condition is true time, whether the failure symptom of the low hydraulic pressure that monitoring is predetermined takes place;
When detecting the failure symptom of initial low hydraulic pressure, wait for that scheduled time slot is with the fault of detection with the corresponding described predetermined quantity of scope of described more than first condition, wherein, when detecting the fault of described predetermined quantity in described scheduled time slot, more than second condition is true.
Scheme 23. is as scheme 22 described methods, it is characterized in that, described more than first condition comprises first grade, the Transmission gear of neutral gear or reverse gear, engine speed, turbine trip speed, transmission output shaft speed and Throttle Position are respectively less than predetermined speed and position threshold, wherein, described more than second condition comprises that described primary fault is the additional fault generation of hanging down the symptom of hydraulic pressure and being scheduled in described scheduled time slot, wherein, when described more than second condition is true time, detected low hydraulic pressure, and wherein,, detected component failure when described more than second condition is not true time.
When described more than second condition is not true time, producing Transmission malfunction is physical fault to indicate detected fault, and order change-speed box diagnostic response; And
When described more than second condition is true time, the restorative neutral gear of the initial gear when having ordered specific to low hydraulic pressure, and consider more than the 3rd condition.
Scheme 25. also comprises as scheme 24 described methods:
Thereby described more than second condition be met indicated detect low hydraulic pressure after, determine whether one or more in described more than the 3rd condition are true; And
When described more than the 3rd condition is not true time, if be in the Neutral Position of described manual selector valve and in scheduled time slot, do not recover, then order described restorative neutral gear and setting to indicate the fault of low hydraulic pressure, if low hydraulic pressure perhaps takes place in the progressive position of described manual selector valve or reverse gear position, then orders described restorative neutral gear and setting to indicate the fault of low hydraulic pressure at once.
Scheme 27. is as scheme 26 described methods, it is characterized in that, when described more than the 3rd condition is not true time, exist and to allow one or more in described more than the 3rd condition of chance that described predetermined failure recovers, when described manual selector valve when neutral gear reaches the schedule time, the Transmission malfunction of having indicated low hydraulic pressure is set, the Transmission malfunction of having indicated low hydraulic pressure perhaps is set when described manual selector valve is in D Drive or reverse gear at once, wherein, Transmission malfunction is set not to be stoped and recovers, and wherein, be provided with that to have indicated low main described Transmission malfunction of pressing be not in described more than the 3rd condition one.
Scheme 29. also comprises as scheme 27 described methods: because before producing described low-voltage signal recovery has taken place, thus do not produce low-voltage signal, and restart the normal operation of described change-speed box.
Scheme 30. is as scheme 27 described methods, also comprise: produce low-voltage signal, and before any generation in described more than the 3rd condition the valve recovery has taken place, then restart the normal operation of described change-speed box, and utilize described low-voltage signal to write down temporary transient low hydraulic pressure, be used for further diagnosis.
From the detailed description that is hereinafter provided, other field of applications of the present invention will become apparent.Should be understood that detailed description and instantiation are only used for illustrative purposes, rather than intention limits the scope of the invention.
Description of drawings
Present invention will become more fully understood from the detailed description and the accompanying drawings, in the accompanying drawing:
Fig. 1 is the functional block diagram according to exemplary engine system of the present invention;
Fig. 2 A is the scheme drawing according to the flow of hydraulic fluid in the exemplary speed fluid drive of the present invention;
Fig. 2 B is the scheme drawing according to the mechanical attachment (mechanicallinkage) in the exemplary speed fluid drive of the present invention;
Fig. 3 is the functional block diagram according to exemplary control module of the present invention; And
Fig. 4 is used for detecting the loss of pressure of hydraulic automatic transmission and it is made the diagram of circuit of the illustrative methods of response according to of the present invention.
The specific embodiment
Following being described in only is exemplary in essence, and never is intention restriction invention, its application, or uses.For the sake of clarity, will use identical Reference numeral to indicate similar element in the accompanying drawings.Phrase used herein " at least one among A, B and the C " is to be understood as the logic of representing with the nonexcludability logical "or" (A or B or C).Should be understood that under the situation that does not change the principle of the invention, the step in the method can be carried out by different orders.
Term used herein " module " is meant treater (shared, special-purpose or in groups) and memory device, the combinational logic circuit of special IC (ASIC), electronic circuit, the one or more softwares of execution or firmware program and/or other suitable components of described function is provided.
Conventional control system of speed variator can detect the fault of the valve in the hydraulic automatic transmission.Then, control system of speed variator can determine whether and need be keeped in repair change-speed box when the valve et out of order.The valve fault can take place owing to the inefficacy of valve and/or magnet coil.Yet alternatively, the valve fault also can take place owing to the low hydraulic pressure in the change-speed box.Yet, low hydraulic pressure also can be owing to other situations cause, such as but not limited to: the damage of suction strainer, the amount of hydraulic fluid improper (for example, inappropriate hydraulic fluid filling) and/or because the loosening loss of pressure from tor-con (pressure drain) that is caused of seal ring.Therefore, conventional control system of speed variator can detect the valve fault improperly owing to hang down hydraulic fluid pressure.Detecting the valve fault improperly can cause: because of unsuitable valve body is changed the warranty costs increase that is caused and/or failed to repair the practical problems that causes low hydraulic fluid pressure.
Therefore, this paper provides a kind of system and method that unit failure in the hydraulic automatic transmission and definite fault are the indications of losing efficacy of low hydraulic pressure or physical unit that detects.More properly saying, is that this system and method can be waited for to detect a plurality of faults before physical unit lost efficacy at definite primary fault.More specifically, this system and method can detect a plurality of valve faults in the change-speed box or get loose (dropout).For example, this system and method can detect getting loose of valve according to valve integraty and/or response valve time.Yet in addition or alternatively, this system and method can detect the indication of low hydraulic pressure, comprises fault and/or " turbine trip speed sudden change (turbine speed flare) " indication (TSF) of reverse gear pressure switch (RPS).For example, this system and method can detect the RPS fault according to the integraty of RPS.In addition, for example this system and method can according to tor-con in the undue fluctuation of rotating speed of the input shaft that couples mutually of turbine detect the TSF indication.TSF in D Drive or reverse gear gear gets loose together with valve and/or RPS and has indicated low hydraulic pressure.Similarly, get loose and/or RPS gets loose and also can indicate low hydraulic pressure at a plurality of valves of neutral gear gear.
This system and method can determine whether detected fault is because low hydraulic pressure causes then.More specifically, this system and method can determine whether to have detected predetermined quantity indication the fault of low hydraulic pressure.Only be that the fault of predetermined quantity can be two faults for example.Yet whether this system and method is can require a plurality of conditions for true when hydraulic pressure causes owing to hanging down at definite primary fault.Described a plurality of condition can include but not limited to: (1) Transmission gear (range) comprises in first grade, reverse gear and the neutral gear; (2) engine speed, turbine trip speed, transmission output shaft speed (TOSS) and Throttle Position are respectively less than predetermined speed and position threshold; And (3) primary fault has been indicated low hydraulic pressure (that is, meeting low hydraulic characteristic).
If described a plurality of conditions are true when primary fault, then this system and method can determine whether to have detected additional (or other (additional)) fault of predetermined quantity in scheduled time slot.More specifically, if in scheduled time slot, detect the fault that is less than predetermined quantity, then this system and method can determine initial detecting to fault be not because low hydraulic pressure causes.Yet, alternatively, if in scheduled time slot, detect the additional fault of predetermined quantity, this system and method also can determine initial detecting to fault be because low hydraulic pressure causes.When detecting low hydraulic pressure, order has reflected the neutral gear gear of the valve position when losing efficacy in all manual selector valve positions.The specific neutral gear gear of command expiration is up to the wait of recovery or a plurality of recovery condition termination to possible recovery takes place.Recovery can be defined as detected fault disappearance (that is, eliminating).If the one or more conditions in a plurality of recovery conditions took place in the certain period after detecting low hydraulic pressure, then this system and method can stop to wait for, so that from low hydraulic recovery.If recover, then can restart the operation of normal speed change device; Yet,, can order the Transmission gear consistent and can produce low hydraulic pressure signal with low hydraulic pressure if do not recover.In other words, this system and method can detect the low hydraulic pressure in the change-speed box effectively, Wait-to-Restore, owing to the cause of a plurality of conditions stops wait to recovering, then with normal operation response or to adopt the gear consistent to be responded and to send low main signal of pressing with low hydraulic pressure, and do not need to keep in repair (that is, valve body change).
Described a plurality of recovery condition can include but not limited to: respectively greater than engine speed, turbine trip speed, TOSS and the Throttle Position of predetermined speed and position threshold, and the termination of calibration period.If desired predetermined low hydraulic pressure indication does not occur in this period, then this system and method can require to carry out valve maintenance (that is, this fault is not because due to the low hydraulic pressure).Alternatively, if a generation in desired predetermined low hydraulic pressure indication appearance and the described a plurality of recovery condition (that is, this fault is because due to the low hydraulic pressure), then this system and method can determine that change-speed box is experiencing low hydraulic pressure.For example, this system and method can produce chaufeur and/or the requirement maintenance of low hydraulic pressure signal with the warning vehicle.
Referring now to Fig. 1,, engine system 10 comprises driving engine 12.Driving engine 12 16 sucks induction maniflod 14 with air by entering the mouth, and it can be regulated by throttle gate 18.Throttle position sensor (TPS) 20 can produce the TPS signal of the position of having indicated throttle gate 18.Air in the induction maniflod 14 can be assigned in a plurality of cylinders 22.Though there is shown 6 cylinders, driving engine 12 can comprise the cylinder of other quantity.
Be assigned in the cylinder 22 air can with the fuel mix from a plurality of fuel injectors 24, thereby form air/fuel (A/F) compound.For example, fuel injector 24 can be spurted into fuel respectively the air inlet port (that is port fuel injection) of cylinder 22.Alternatively, fuel injector 24 can inject directly into (that is, directly fuel sprays) in each cylinder 22 to fuel respectively.
A/F compound in the cylinder 22 can be by piston (not shown) compression and respectively by the spark ignition (that is spark ignition combustion) from a plurality of light-up plugs 26.In addition or alternatively, the A/F compound can be compressed, thus cause automatic igniting (that is, homogeneous charge compression ignition or HCCI burning or compression ignition combustion, for example diesel motor) until reaching critical temperature and/or critical pressure.
The burning driven plunger (not shown) of A/F compound in cylinder 22.Piston (not shown) thus bent axle 28 is rotated rotatably produces driving torque.Engine speed sensor 30 produces the engine speed signal (RPM) of the rotating speed (being unit with number of revolution per minute or RPM for example) of having indicated bent axle 28.The exhaust that burning forms is discharged from the cylinder 22 of driving engine 12 through dontake pipe 32.Can handle exhaust by exhaust-gas treatment system 34, so that before exhaust is discharged into atmosphere, reduce discharging.
Can the driving torque that produce be passed to vehicle transmission system 36 (for example, wheel) from bent axle 28 via tor-con 38 and/or change-speed box 40.Tor-con 38 can couple bent axle 28 with change-speed box 40 mutually.For example, tor-con 38 can comprise the hydraulic coupler of hydraulic pressure, and change-speed box 40 can comprise hydraulic automatic transmission.Turbine trip speed (TS) sensor 42 can produce the TS signal of the rotating speed of having indicated the turbine 39 in the tor-con 38.For example, TS sensor 42 also can be measured the input shaft rotational speed of change-speed box 40.
Change-speed box 40 can comprise one or more compound planet gears that are used to obtain to expect transmitting ratio.Valve body in the change-speed box 40 (VB) 41 can comprise the valve of a plurality of modulated pressure fluid streams, in order to activate each parts of change-speed box 40.For example, each parts of change-speed box 40 can include but not limited to power-transfer clutch, servomechanism, switch etc.
Change-speed box 40 can recently double from the driving torque (via tor-con 38) of bent axle 28 by the transmission of expectation, and the driving torque of multiplication is outputed to vehicle transmission system 36.Transmission output shaft speed (TOSS) sensor 44 can produce the TOSS signal of the rotating speed of the output shaft (not shown) of having indicated change-speed box 40.For example, TOSS can be corresponding with the rotating speed of vehicle transmission system 36 (for example, wheel).
The operation of control module 50 control engine systems 10.More specifically, control module 50 may command throttle gates 18, fuel injector 24, light-up plug 26, tor-con 38 and change-speed box 40.Yet control module 50 is the miscellaneous part of may command engine system 10 also.Control module 50 also can receive the signal from TPS sensor 20, RPM sensor 30, TP sensor 42 and TOSS sensor 44.Yet control module 50 also can receive from the indication of other sensors the signal of various other engine operating parameters (that is result of a measurement).Control module 50 also can be implemented system of the present invention and/or method.
Referring now to Fig. 2 A,, illustrates in greater detail hydraulic fluid flowing between each valve in the valve body 41 of change-speed box 40 among the figure.Valve body 41 receives the hydraulic fluid (HF) of pressurization.For example, valve body 41 can receive the hydraulic fluid from the pressurization of the main pump in the tor-con 38.Yet valve body 41 also can receive the hydraulic fluid from the pressurization of other pumps or engine parts.Valve body 41 also can communicate with control module 50.More specifically, the fault of each parts of control module 50 may command and/or diagnosis valve body 41 for example.
Valve body 41 can comprise: converter clutch (TCC) valve 52, manual selector valve 53, first shift valve 54, second shift valve 55, the 3rd shift valve 56 and reverse gear pressure switch (RPS) 82.Though show 5 valves 52～56, valve body 41 can comprise the valve of other quantity.More specifically, for example valve body 41 can comprise the shift valve of other quantity.Particularly, for example TCC valve 52 can be communicated with the power-transfer clutch in the tor-con 38,, provides its actuating that is.
Valve 52～56 represents that jointly hydraulic fluid can flow through valve body 41 so that activate the mulitpath of various transmission components (TCs).For example, transmission components can include but not limited to servomechanism, power-transfer clutch, or the like.In other words, can open one or more in the valve 52～56, and activate one or more (for example, power-transfer clutchs) in the transmission components so that allow hydraulic fluid to flow to one or more in the transmission components.Only be for example, valve 52～56 can be the spring-opposed valve with different spring stiffnesss, so each valve in the valve 52～56 all can be depending on the pressure of hydraulic fluid and opens.Alternatively, only be for example, the mode control cock 52～56 of available electron is for example by control module 50.
On the other hand, RPS 82 has indicated the state of manual selector valve 53.More specifically, when manual selector valve 53 was in D Drive or neutral gear, RPS 82 can be in first state (" ON ").On the other hand, when manual selector valve 53 was in reverse gear position, RPS 82 can be in second state (" OFF ").Therefore, control module 50 can be by communicating to determine the state of manual selector valve 53 with RPS 82.
Yet control module 50 also can detect the valve fault.More specifically, control module 50 can detect the fault of the one or more valves in the valve 52～56 according to the integraty of valve 52～56 pressure drop of valve (that is, through) and/or response.The integraty of valve can be depending on valve when closing through the pressure drop of valve.Therefore, for example when through the pressure drop of valve greater than corresponding to the predetermined pressure drop of integraty threshold value (that is, pressure leakage) time, control module 50 can detect the fault of a valve in the valve 52～56.The response of valve can be depending on that the order valve is opened and the time length of valve between beginning to open.Can come valve is given an order via the hydraulic fluid of pressurization or via electronic signal.Therefore, for example when the response of valve during greater than response lag (that is, valve damages or stops up), control module 50 can detect the fault of a valve in the valve 52～56.In addition, control module 50 can detect the fault of RPS 82 according to the integraty of RPS 82.The integraty of RPS 82 can be depending on the position of RPS 82 with respect to manual selector valve 52.When control module 50 determine RPS 82 be OFF (that is, being in second state) and manually selector valve 53 be during at D Drive or neutral gear, may have low hydraulic state, perhaps may have RPS integraty state.
Referring now to Fig. 2 B,, illustrates in greater detail the mechanical attachment between each parts of change-speed box 40 among the figure.In other words, the not shown hydraulic fluid of Fig. 2 B is through flow (the seeing Fig. 2 A) of the valve 52～56 in the valve body 41.In one embodiment, change-speed box 40 can be 6 gear transmissions, as shown in the figure.Yet, be understandable that, also can adopt various other change-speed boxs, for example dissimilar change-speed boxs, and the change-speed box that comprises the varying number gear.Only be that this change-speed box can be a dual-clutch transmission for example.Change-speed box 40 also can communicate with control module 50.More specifically, the fault of each parts of control module 50 may command and/or diagnosis change-speed box 40 for example.
40 corresponding comprising of change-speed box: compound planet gear 64A, 64B and the 64C of input shaft 60, output shaft 62 and three interconnection.For example, input shaft 60 can be by the turbine drives of tor-con 38.Therefore, the rotating speed of input shaft 60 can equal by the measured turbine trip speed of TS sensor 42.Similarly, TOSS sensor 44 can be measured the rotating speed of the output shaft 62 of change-speed box 40.
Provide hydraulic pressure (PHYD) to regulate the joint of each power-transfer clutch optionally for each power-transfer clutch.In other words, this hydraulic pressure PHYD can allow hydraulic fluid flow through in the valve body 41 particular valve and make corresponding clutch engagement.Pressure switch 80 can be associated with the pressure line to each power-transfer clutch, and switches between ON state and OFF state.More specifically, when PHYD was lower than threshold pressure (PTHR), switch was in the OFF state.As PHYD during greater than PTHR, switch is in the ON state.
As the diagram in the following table 1, state that can control clutch C1～C5 (that is, and joint or separate), with provide 6 speed of advances than (1,2,3,4,5 and 6), 1 reverse speed than (R) or neutral state (N).
Table 1
| C1 | C2 | C3 | C4 | C5 | |
| The 1st speed of advance ratio | X | X |
| The 2nd speed of advance ratio | X | X | |||
| The 3rd speed of advance ratio | X | X | |||
| The 4th speed of advance ratio | X | X | |||
| The 5th speed of advance ratio | X | X | |||
| The 6th speed of advance ratio | X | X | |||
| Reverse speed is than (R) | X | X | |||
| Neutral state (N) | X |
For example, when power-transfer clutch C1 and C4 joint, establish second speed of advance than (that is second gear).Usually can engage the conversion that another power-transfer clutch (that is, being about to oncoming clutch) realizes comparing from the speed of advance of a speed another speed of advance ratio simultaneously by making a disengaging of clutch (that is, being about to disengaged clutch).For example, can separate engaging clutch C5 simultaneously by making power-transfer clutch C4, thereby make change-speed box 40 lower category first grade from second grade.
In addition, RPS 82 can change between the indication of the indication of the D Drive of manual selector valve 53 or Neutral Position and the reverse gear position of manual selector valve 53.In other words, for example RPS 82 can be in ON state (that is first state) be at D Drive or neutral gear to indicate manual selector valve 53.Yet it is in reverse gear position to indicate manual selector valve 53 that RPS 82 can be switched to OFF state (that is second state).By the manual selector valve 53 of input (for example, shifter bar) control from the vehicle driver, and RPS 82 has reflected the state of manual selector valve 53.RPS 82 does not reflect Transmission gear.
Yet control module 50 also can be carried out the RPS diagnosis and detect the TSF indication.More specifically, control module 50 can detect the fault of RPS 82 according to the integraty of RPS 82.The integraty of RPS 82 can be depending on and activates the required pressure of RPS 82 and the manual position of selector valve 53.Therefore, for example control module 50 can detect the integrity failure of RPS 82.The RPS integrity failure can be in D Drive or neutral gear and RPS 82 at manual selector valve 53 and take place when closing (OFF) state from opening (ON) state exchange.The RPS integrity failure also can be in reverse gear position and RPS82 at manual selector valve 53 and take place when opening (ON) state from closing (OFF) state exchange.In addition, in scheduled time slot, (that is when, input shaft rotational speed) variation was greater than scheduled volume, control module 50 can detect the TSF indication as TS.
Referring now to Fig. 3,, illustrates in greater detail control module 50 among the figure.Control module 50 can comprise fault detection module 90 and change-speed box diagnostic module 95.Though illustrate a fault detection module 90, control module 50 can comprise a plurality of fault detection module that detect dissimilar faults (for example, valve fault, RPS integrity failure, TSF indication etc.) separately.
Fault detection module 90 and change-speed box 40 communicate and detect the fault of each parts of change-speed box 40.More specifically, fault detection module 90 can detect the valve fault according to the integraty and/or the response of valve 52～56, as shown in Fig. 2 A.In addition or alternatively, fault detection module 90 can indicate to determine the RPS fault according to integraty and/or the TSF of RPS 82, as shown in Fig. 2 B.
The detected fault that change-speed box diagnostic module 95 receives from fault detection module 90.Change-speed box diagnostic module 95 also can receive Throttle Position from TPS sensor 20, from the engine speed of RPM sensor 30 with from the turbine trip speed of TS sensor 42.Change-speed box diagnostic module 95 also can receive other signals of other driving engines of indication and change-speed box operational factor (for example, speed, pressure, temperature etc.).
Change-speed box diagnostic module 95 determines whether detected fault is because the error diagnostics that low hydraulic pressure caused in the change-speed box 40.In other words, change-speed box diagnostic module 95 can determine whether detected fault is whether physical fault or detected fault are because the low hydraulic pressure in the change-speed box 40 causes.Therefore, change-speed box diagnostic module 95 can produce low-voltage signal or Transmission malfunction signal.
Low-voltage signal can indicate the fault of the detection in the change-speed box 40 to be because low hydraulic pressure causes.For example, but the low-voltage signal alerting driver need keep in repair, to repair the low pressure (that is pressure leakage) in the change-speed box 40.Alternatively, can to indicate the fault of the detection in the change-speed box 40 be physical fault to the Transmission malfunction signal.In other words, for example the Transmission malfunction signal can be indicated and need be keeped in repair (or replacing) to valve body 41, to repair valve fault or RPS integrity failure.
At first, if a plurality of conditions are " very " when detecting primary fault, change-speed box diagnostic module 95 can be waited for so, up to the fault that detects predetermined quantity.For example, the predetermined quantity of fault can be two.In other words, wait for the wrong diagnosis (that is, increasing robustness) that can prevent to cause unnecessary maintenance (and therefore causing warranty costs to increase) more than 1 detected fault.In one embodiment, change-speed box diagnostic module 95 can determine that then detected fault is physical fault (that is not being because the wrong diagnosis that low pressure caused).Therefore, for example change-speed box diagnostic module 95 can wait by the time produce the Transmission malfunction signal during fault of predetermined quantity.If predetermined periods is over and done with before detecting the fault of predetermined quantity, then can produce the Transmission malfunction signal.
Yet alternatively, transmission control module 95 can detect the fault of predetermined quantity in scheduled time slot.More specifically, when described a plurality of conditions were " very ", transmission control module 95 can determine that initial inefficacy is because low hydraulic pressure rather than component failure in the change-speed box 40 cause, and this is because the additional fault of predetermined quantity has taken place in scheduled time slot.Be used to judge whether primary failure is because a plurality of conditions that low hydraulic pressure is caused comprise: the Transmission gear of first grade, neutral gear or reverse gear, engine speed, turbine trip speed, TOSS are less than calibration, and the failure symptom of low hydraulic pressure.
Therefore, take place to recover when the fault that detects predetermined quantity and in scheduled time slot and when manually selector valve 53 was in Neutral Position simultaneously, transmission control module 95 can produce low-voltage signal.Similarly, manually selector valve 53 is in reverse gear position or progressive position simultaneously if detected low hydraulic pressure, and transmission control module 95 can be set low-voltage signal so.No matter whether transmission control module 95 has produced low-voltage signal, can continue a generation in described a plurality of recovery conditions to the wait that recovers.Described a plurality of recovery condition comprises the recovery of following condition respectively: low hydraulic pressure, engine speed, turbine trip speed, TOSS, Throttle Position and/or greater than time of the passage of threshold value.Low-voltage signal can be used to alerting driver (for example, by fault-indicating lamp or MIL).Low pressure (that is pressure leakage) in the change-speed box 40 be diagnosed and be keeped in repair to chaufeur can to vehicle then.
Referring now to Fig. 4,, is used for detecting the loss of pressure of hydraulic automatic transmission and its method of making response is started from step 100.In step 100, control module 50 determines whether driving engine 12 is opened.If " very ", then control method may continue to step 104.If " vacation ", then control method can be back to step 100.
In step 104, control module 50 detectable failures.For example, this fault can comprise one or more in valve fault, RPS integrity failure and the TSF indication.In step 108, a plurality of conditions are checked, whether can be low main symptom of pressing to determine primary fault.If " very ", then control method may continue to step 112.If " vacation ", then control method may continue to step 116.
In step 112, control module 50 can determine whether to have taken place the additional fault of predetermined quantity in the time of scheduled volume.If " very ", then control method may continue to 120.If " vacation ", then control method may continue to 116.
In step 116, control module 50 can determine that detected fault is a physical fault.For example, the control module 50 Transmission malfunction signal that can produce alerting driver and/or require the valve body 41 to change-speed box 40 to keep in repair/change.Control method can finish then.In step 120, control module 50 can determine that detected fault is because the fault of the error diagnostics that low hydraulic pressure caused in the change-speed box 40.For example, control module 50 can produce the low-voltage signal that alerting driver and/or requirement are keeped in repair, with the diagnosis and the reason (that is pressure leakage) of repairing low hydraulic pressure.Control method can finish then.
Extensive instruction of the present invention can be implemented in a variety of forms.Therefore, though present invention includes instantiation, true scope of the present invention should not be limited to this, because for one of ordinary skill in the art, other modifications will be conspicuous on the basis of studying accompanying drawing, specification sheets and claims carefully.
Claims (10)
1. control system that is used for hydraulic automatic transmission comprises:
Fault detection module, it detects the fault of the parts of described change-speed box, and wherein, described fault can be indicated the low hydraulic fluid pressure in the described change-speed box or the inefficacy of the one or more parts in the described parts; And
The change-speed box diagnostic module, its predetermined quantity and a plurality of condition according to described detected fault, fault determines whether described fault is because low hydraulic pressure causes.
2. control system as claimed in claim 1 is characterized in that, described parts comprise valve, reverse gear pressure switch, throttle position sensor, engine speed sensor, gearbox output shaft speed sensor and turbo speed sensor.
3. control system as claimed in claim 2, it is characterized in that, described fault detection module detects the fault of described valve according to the response of the integraty of described valve and described valve, wherein, the integraty of described valve is based on described valve when closing through the pressure drop of described valve, and wherein, the response of described valve is based on the delay between described valve of order and the described valve of actuating.
4. control system as claimed in claim 2, it is characterized in that, described fault detection module detects the fault of described reverse gear pressure switch according to the integraty of described reverse gear pressure switch, wherein, the integraty of described reverse gear pressure switch comprises the state of described reverse gear pressure switch with respect to manual selector valve position.
5. control system as claimed in claim 2 is characterized in that, described fault detection module detects the indication that turbine trip speed suddenlys change according to the variation of tor-con turbine speed in the scheduled time slot, and wherein, described tor-con turbine couples mutually with described input shaft.
6. control system as claimed in claim 1 is characterized in that, the predetermined quantity of described fault is more than or equal to 2, and wherein, the fault of described predetermined quantity takes place in scheduled time slot.
7. control system as claimed in claim 1, it is characterized in that, described a plurality of condition comprises more than first condition, and wherein, described change-speed box diagnostic module determines whether described more than first condition is true, wherein, when described more than first condition is true time, whether described change-speed box diagnostic module monitoring predetermined low hydraulic fault symptom has taken place, wherein, when detecting initial low hydraulic fault symptom, described change-speed box diagnostic module is waited for scheduled time slot, with the fault of detection with the corresponding predetermined quantity of scope of described more than first condition, and wherein, when detecting the fault of described predetermined quantity in described scheduled time slot, more than second condition is true.
8. control system as claimed in claim 7, it is characterized in that, described more than first condition comprises first grade, the Transmission gear of neutral gear or reverse gear, engine speed, turbine trip speed, transmission output shaft speed and Throttle Position are respectively less than predetermined speed and position threshold, wherein, described more than second condition comprises that described primary fault is the symptom of low hydraulic pressure and described predetermined additional fault has taken place in described scheduled time slot, wherein, when described more than second condition is true time, detected low hydraulic pressure, and wherein,, then detected component failure when described more than second condition is not true time.
9. control system as claimed in claim 8, it is characterized in that, when described more than second condition is not true time, described change-speed box diagnostic module produces Transmission malfunction, to indicate described detected fault is physical fault, and order change-speed box diagnostic response, and wherein, when described more than second condition is true time, the restorative neutral gear of the initial gear when having ordered and consider more than the 3rd condition specific to low hydraulic pressure.
10. control system as claimed in claim 9, it is characterized in that, after thereby described more than second condition has been met the testing result of the low hydraulic pressure of indication, described change-speed box diagnostic module determines whether one or more in described more than the 3rd condition are true, and wherein, when described more than the 3rd condition is not true time, if be in the Neutral Position of described manual selector valve and in predetermined periods, do not recover, then order described recovery neutral gear and the fault of having indicated low hydraulic pressure is set, if and, then order described recovery neutral gear at once and the fault of having indicated low hydraulic pressure be set at the progressive position of described manual selector valve or the low hydraulic pressure of position generation that reverses gear.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US25979209P | 2009-11-10 | 2009-11-10 | |
| US61/259,792 | 2009-11-10 | ||
| US61/259792 | 2009-11-10 | ||
| US12/730530 | 2010-03-24 | ||
| US12/730,530 US8543279B2 (en) | 2009-11-10 | 2010-03-24 | System and method for detecting and responding to pressure losses in a hydraulic automatic transmission |
| US12/730,530 | 2010-03-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102050109A true CN102050109A (en) | 2011-05-11 |
| CN102050109B CN102050109B (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010546278.0A Expired - Fee Related CN102050109B (en) | 2009-11-10 | 2010-11-10 | System and method for detecting and responding to the pressure loss in hydraulic automatic transmission |
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| Country | Link |
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| CN (1) | CN102050109B (en) |
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| CN114194124A (en) * | 2021-12-30 | 2022-03-18 | 合肥工业大学 | Method and system for detecting walking fault of double-flow transmission vehicle |
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| CN102050109B (en) | 2014-04-02 |
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