CN1296688C - Device and method for determining fault of automatic transmission - Google Patents
Device and method for determining fault of automatic transmission Download PDFInfo
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- CN1296688C CN1296688C CNB2003101002398A CN200310100239A CN1296688C CN 1296688 C CN1296688 C CN 1296688C CN B2003101002398 A CNB2003101002398 A CN B2003101002398A CN 200310100239 A CN200310100239 A CN 200310100239A CN 1296688 C CN1296688 C CN 1296688C
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims description 14
- 230000007935 neutral effect Effects 0.000 claims abstract description 53
- 230000001360 synchronised effect Effects 0.000 claims abstract description 23
- 239000003921 oil Substances 0.000 claims description 18
- 239000010720 hydraulic oil Substances 0.000 claims description 13
- 230000003213 activating effect Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
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- 230000005856 abnormality Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
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Abstract
When a shift routine is not being executed in an automatic transmission and a difference between an actual turbine speed and a calculated synchronous speed is equal to, or greater than, a preset value alpha, a difference DeltaNT between an estimated turbine speed and the actual speed when the automatic transmission is in a neutral state is calculated. When DeltaNT is equal to, or less than, a preset value beta, it is determined that a failure related to the neutral state of the automatic transmission has occurred. Also, when DeltaNT is greater than a preset value beta, it is determined that a failure related to slipping of a frictional engaging element has occurred.
Description
Technical field
The present invention relates to detect the technology of TRANS FAILSAFE PROG, particularly accurately detect the technology of the reason of engine speed increase in the running.
Background technology
The device of detection failure is contained on the automatic transmission of automobile usually when automobile runs.The fault that detects for example is electric fault such as sensor fault, and perhaps fault of trigger etc., or mechanical fault such as shift valve or speed change solenoid valve are stuck the slip of the parts that perhaps are frictionally engaged.When this class fault took place, safety feature just started, and tells the driver with fault.Then, determine location of fault, carry out necessary repairing.
For example Jap.P. No.1-172663 discloses a kind of fail-safe control device of electronic automatic transmission, and this control device can detect the fault of automatic transmission structure parts.This control device comprises variator input speed sensor and several circuit, wherein a kind of circuit is according to the circuit of the actual transmission gear ratio of a kind of speed calculation variator in variator input speed, variator output speed and the Vehicle Speed, another kind of circuit is the circuit that obtains regular transmission gear ratio, and also having a kind of circuit is the circuit that regular transmission gear ratio is compared with the calculating transmission gear ratio; There is a kind of circuit to detect the circuit of automatic transmission mechanical part fault according to result relatively again.
Fail-safe control device is according to the actual transmission gear ratio of a kind of speed calculation automatic transmission in the input speed, output speed and the car speed that detect.On the other hand, calculate normal transmission gear ratio according to for example MLP and gearshift solenoid valve output state.Therefore, when the difference between actual transmission gear ratio and the normal transmission gear ratio departs from predetermined value, just can detect the fault of automatic transmission.
When instruction automatic transmission gear shift during to predetermined gear speed, two kinds of faults may take place: the engaging force that torque transmits the fault (being called " first fault " later on) of interrupting and the parts that are frictionally engaged makes the fault (being called " second fault " later on) of parts slip of being frictionally engaged inadequately greatly.
First fault causes that owing to by-pass valve control is undesired this by-pass valve control is directly controlled the fluid pressure that is transported to the parts that are frictionally engaged, and utilizes this fluid pressure can form predetermined gear speed.In this case, because be frictionally engaged not performance effect fully of parts, so torque can not be transmitted, this causes speed change gear to be in the neutral state.At this moment, the speed of power source increases, because almost there is not load on power source.On the other hand, second fault is that this control valve is regulated the hydraulic oil of being emitted by oil pump because the fault of control valve causes.When control valve broke down, the base pressure of automatic transmission hydraulic oil (so-called principal pressure) just reduced.As a result, the fluid pressure that is transported to the parts that are frictionally engaged also reduces.In this case, the level of torque (being amount of torque) that is transmitted by the parts that are frictionally engaged will reduce.As a result, a part of torque that only is input to automatic transmission is transmitted, and then causes the increase of power source speed.
When control device can detect automatic transmission and whether has fault, if possible there are two and a plurality of reasons, then be not easy to determine very much the reason of this fault.That is, when power source speed increases when vehicle travels with predetermined gear speed, be not easy to distinguish very much the state that causes automatic transmission under this speed increase.
Summary of the invention
Because the problems referred to above, the present invention proposes a kind of apparatus and method of definite TRANS FAILSAFE PROG, can accurately determine the reason that power source speed increases.
According to a first aspect of the present invention, determine that when vehicle ' the device of TRANS FAILSAFE PROG comprises: first pick-up unit is used to determine whether to carry out the speed change program of described automatic transmission; Calculation element is according to the output speed and the speed ratio calculating synchronous speed of described automatic transmission; Second pick-up unit detects the input speed of described automatic transmission; Apparatus for predicting is input to the torque of described automatic transmission according to car power source, infers when power transmits to interrupt the input speed when described automatic transmission is in neutral condition; Second calculation element, when first difference between the speed change program of not carrying out described automatic transmission and described synchronous speed and the described input speed during, calculate second difference (Δ NT) between the input speed of the input speed that detects and deduction more than or equal to predetermined value (α); Determine device with fault, when described second difference is less than or equal to second predetermined value, determine to have taken place first fault that described automatic transmission is in the neutral state, and when described second difference during greater than this second predetermined value, the parts that are frictionally engaged of determining to be used to set up the gear-change of automatic transmissions bit rate produce second fault of sliding.
Fault determines that the Device Testing device detects the duty (for example input speed) of automatic transmission.Apparatus for predicting is input to the duty of the torque deduction automatic transmission of automatic transmission according to power source.This duty is the state that automatic transmission is in the neutral state of power transmission interruption.Fault is determined that device is determined according to the duty (for example according to the difference of these duties, the relation of amount etc.) of duty that detects and deduction and the identification automatic transmission is in first fault of neutral and is different from second fault of first fault.Second fault relates to the fault of parts generation slip that for example is frictionally engaged, and utilizes the parts that are frictionally engaged can set up the gear speed of automatic transmission.When the duty that detects was identical with the duty of inferring basically, this fault determined that device determines to have taken place first fault of neutral on variator.When the duty of the duty that detects and deduction fully not simultaneously, this fault determines that device can determine to be different from second fault of first fault (for example producing the fault of slip about the parts that are frictionally engaged).The result, according to a first aspect of the present invention, can determine the fault of automatic transmission, for example can determine and discern second fault that automatic transmission is in first fault of neutral and the parts generation that is frictionally engaged is slided, utilize these parts that are frictionally engaged to set up the gear speed of automatic transmission.
In first aspect, can also use the duty of the input speed of automatic transmission as automatic transmission.Apparatus for predicting can infer that variator is in the input speed of neutral state.This fault determines that device can measure and the identification variator is in first fault of neutral and is different from second fault (parts that for example are frictionally engaged produce the fault of sliding) of first fault according to these input speeds (for example according to the difference of speed or according to the difference of amount).
In addition, fault determines that device can determine: when the difference between the input speed of input speed that detects and deduction is lower than preset value (promptly when the difference between the speed less), first fault that automatic transmission is in the neutral state has taken place; When the input speed of input speed that detects and deduction surpassed preset value (promptly when the difference between the speed bigger), the parts that are frictionally engaged that have been used to set up the gear-change of automatic transmissions bit rate produced second fault of slip.
In first aspect, automatic transmission also comprises first operation valve (for example solenoid valve) and second operation valve (for example solenoid valve), and these two kinds of valves are all controlled oil pressure.First operation valve control is used to set up the activating pressure of the parts that are frictionally engaged of gear-change of automatic transmissions bit rate, and second operation valve is regulated the pressure of the hydraulic oil of emitting from oil pump.First fault about the neutral state is the fault of first operation valve, and second fault that takes place to slide about the parts that are frictionally engaged is the fault of second operation valve.
When first operation valve broke down, activating pressure stopped to carry, the feasible component no longer effect that is frictionally engaged.As a result, automatic transmission is in the neutral state that can not transmit torque.When second operation valve broke down, the base pressure of hydraulic oil reduced, and made to transmit be frictionally engaged oil pressure on the parts of enough big acting on.As a result, the parts that are frictionally engaged slide.Therefore when detecting automatic transmission and be in neutral, this fault determines that device can determine that first operation valve breaks down.On the other hand, when detecting the parts that are frictionally engaged and take place to slide, fault determines that device can determine that second operation valve breaks down.
In addition, in first aspect, fault determines that device can be determined when vehicle travels with predetermined gear speed and second fault of sliding takes place about first fault of neutral state with about the parts that are frictionally engaged in identification.Can be when vehicle travel with predetermined gear speed, carry out the definite of fault when promptly automatic transmission is not in gearshift middle.Because fault is determined device and do not measure fault when the normal running automatic transmission, so can accurately determine fault.
In addition, fault is determined that device can satisfy in the speed of power source and is measured when preestablishing condition and second fault of sliding takes place about first fault of neutral with about the parts that are frictionally engaged in identification.Promptly, when the speed of power source has satisfied when preestablishing condition (for example when the speed that detects and the difference between the calculated synchronous speed are positioned at the outside of predetermined speed range), this fault determines that device is determined and second fault of sliding takes place about first fault of automatic transmission neutral state with about the parts that are frictionally engaged in identification.Therefore can reduce as far as possible and do not need definite program of carrying out by being limited in the time of determining between age at failure.
A second aspect of the present invention relates to the method for determining TRANS FAILSAFE PROG when vehicle ', and this method may further comprise the steps: A. first pick-up unit determines whether to carry out the speed change program of described automatic transmission; B. calculation element calculates synchronous speed according to the output speed and the speed ratio of described automatic transmission; C. second pick-up unit detects the input speed of described automatic transmission; D. apparatus for predicting is input to the torque of described automatic transmission according to car power source, infers when power transmits to interrupt the input speed when described automatic transmission is in neutral condition; When E. first difference of second calculation element between the speed change program of not carrying out described automatic transmission and described synchronous speed and described input speed is more than or equal to predetermined value (α), second difference (Δ NT) between the input speed that calculating detects and the input speed of deduction; Determine that with the F. fault device is when described second difference is less than or equal to second predetermined value, determine to have taken place first fault that described automatic transmission is in the neutral state, and in described second difference during greater than this second predetermined value, the parts that are frictionally engaged of determining to be used to set up the gear-change of automatic transmissions bit rate produce second fault of sliding.
In steps A, determine whether to carry out the speed change program of described automatic transmission.In step B, according to the output speed and the speed ratio calculating synchronous speed of described automatic transmission.In step C, detect the input speed of described automatic transmission.In step D, be input to the torque of described automatic transmission according to car power source, infer when power transmits and interrupt the input speed when described automatic transmission is in neutral condition.In step e, first difference between the speed change program of not carrying out described automatic transmission and described synchronous speed and described input speed is during more than or equal to predetermined value, calculates second difference between the input speed of the input speed that detects and deduction.In step F, when described second difference is less than or equal to second predetermined value, determine to have taken place first fault that described automatic transmission is in the neutral state, and in described second difference during greater than this second predetermined value, the parts that are frictionally engaged of determining to be used to set up the gear-change of automatic transmissions bit rate produce second fault of sliding.As a result, can determine the fault of automatic transmission, for example can determine and discern the parts that are frictionally engaged that automatic transmission is in first fault of neutral and is used to set up the gear-change of automatic transmissions bit rate second fault of sliding takes place according to a second aspect of the present invention.
In a second aspect of the present invention, can also make the duty of automatic transmission with the input speed of automatic transmission.
In addition, in a second aspect of the present invention, can determine in step F when determining to break down: when the difference between the input speed of input speed that detects and deduction is lower than predetermined value (when the difference of speed is smaller), having broken down is in first fault of neutral state for automatic transmission; When the difference of the input speed of input speed that detects and deduction surpasses predefined value (when the difference between the speed is big), second fault of slip takes place in fault for the parts that are frictionally engaged that have been used to set up the gear-change of automatic transmissions bit rate.
In a second aspect of the present invention, first fault that is in neutral is the fault of first by-pass valve control on the automatic transmission, the control of this first by-pass valve control is used to set up the activating pressure of the parts that are frictionally engaged of gear-change of automatic transmissions bit rate, and second fault that the parts that are frictionally engaged take place to slide is the fault of second by-pass valve control on the automatic transmission, and this second operation valve is regulated the pressure of the hydraulic oil of emitting in the oil pump.
When first operation valve breaks down, stop to apply activating pressure, so the component no longer effect that is frictionally engaged.As a result, automatic control of transmission becomes the neutral state that can not transmit torque.When second operation valve broke down, the base pressure of hydraulic oil reduced, so no longer can carry the be frictionally engaged oil pressure of parts of enough big acting on.As a result, the parts that are frictionally engaged slide.Therefore, when detecting the neutral state of automatic transmission, can determine in step F that first operation valve breaks down.On the other hand, when detecting the parts that are frictionally engaged and take place to slide, can determine that in the F step second operation valve breaks down.
In addition, in second aspect, can determine that in step F fault is first fault that automatic transmission is in the neutral state when vehicle travels with predetermined gear speed, second fault of slip takes place in the parts that still are frictionally engaged.Therefore, can be when vehicle travel with predetermined gear speed, promptly when not being in gearshift middle, automatic transmission carries out the mensuration of fault.Because when the automatic transmission normal running, in step F, do not determine fault, so can accurately determine fault.
In addition, in second aspect, in the time of can having satisfied the predetermined set condition in the speed of power source, determine that in step F fault is first fault of neutral state, second fault of slip takes place in the parts that still are frictionally engaged.Promptly, when the speed of power source satisfies the predetermined set condition (for example when the speed that detects and the difference between the calculated synchronous speed are positioned at the predetermined speed range outside), can be when vehicle travels with predetermined gear speed, in step F, determine, this fault is first fault that is in the neutral state, and second fault of slip takes place the parts that still are frictionally engaged.Therefore, by limit definite program that the time of determining fault can reduce unnecessary execution as far as possible.
Description of drawings
Fig. 1 is the controlling party block diagram of power train, and this system comprises the device of definite fault of an exemplary embodiments of the present invention.
Fig. 2 is included in the fluid pressure line synoptic diagram in exemplary embodiments automatic transmission of the present invention.
Fig. 3 is the clutch coupling effect chart of exemplary embodiments automatic transmission of the present invention.
Fig. 4 is a process flow diagram, illustrates by exemplary embodiments fault of the present invention to determine the program step that device is carried out.
Fig. 5 illustrates the time dependent curve of exemplary embodiments automatic transmission eigenwert of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED
Describe exemplary embodiments of the present invention with reference to the accompanying drawings in detail.In these accompanying drawings, use the same reference numeral same parts, therefore can save its explanation.
Fig. 1 is the controlling party block diagram of power train, and this power train comprises that the fault of an exemplary embodiments of the present invention determines device.This power train comprises ECT_ECU 100 (electronic automatic transmission _ electronic control unit), automatic transmission 102, engine 106, hydraulic torque converter 108 and oil pump 200.Automatic transmission 102 comprises base pressure operation valve 130, direct pressure operation valve 132 and the parts 134 that are frictionally engaged.
This ECT_ECU 100 is according to the speed of the input vehicle of vehicle speed sensor 112 outputs.This ECT_ECU 100 is according to the aperture of the input air throttle of throttle sensor 114 outputs.This ECT_ECU 100 is also according to the speed of the input engine 106 of engine speed sensor 116 output.
This ECT_ECU 100 is according to the MLP of the calculated signals automatic transmission 102 of MLP sensor 118 outputs.This ECT_ECU 100 is according to the input speed of the input automatic transmission 102 of turbo speed sensor 120 outputs.This ECT_ECU 100 is according to the output speed of the input automatic transmission 102 of output speed sensor 122 outputs.
This ECT_ECU 100 comprises timer 150, the carrying out time of this timer accounting procedure process (for example time of the unusual numerical value of calculating correction values).Like this, this ECT_ECU 100 goes back the time of process of measurement, and carries out next program according to length or the short needs that determine whether of this time.For example, if Measuring Time is shorter than preset time (promptly owing to disturbing or other reason when only temporarily detecting abnormal conditions), then this ECT_ECU 100 can stop to carry out definite program.Because temporary transient abnormal conditions are not to determine the mensuration purpose of program, carry out the number of times that fault is determined program so can reduce.
This ECT_ECU 100 calculates synchronous speed (i.e. the turbine trip speed of Ji Suaning) according to the output speed and the transmission gear ratio of automatic transmission 102.This ECT_ECU 100 is then according to the output torque of throttle opening and fuel injection amount calculation engine 106.The turbine trip speed of inferring when subsequently, this ECT_ECU 100 is in the neutral state according to the output torque calculation automatic transmission of calculating 102.
" neutral state " in this case is meant the state of the torque transfer interruption that is input to automatic transmission 102.At this moment, because the abnormality of direct pressure operation valve 132 for example, can not produce and act on the required oil pressure of the parts 134 of being frictionally engaged, thereby can not reach predetermined gear speed, therefore the parts 134 that are frictionally engaged are not subjected to effect (perhaps sliding), reach the degree that can not transmit torque.
This ECT_ECU 100 is to base pressure operation valve 130 output signals, and control is added to the base pressure (so-called principal pressure) on the automatic transmission 102.This ECT_ECU 100 is then to direct operation valve 132 output signals, and control is added to the fluid pressure of the hydraulic oil of the parts 134 that are frictionally engaged.These parts 134 that are frictionally engaged play effect according to the oil pressure of hydraulic oil then.
Fig. 2 is included in the synoptic diagram of the fluid pressure line in the exemplary embodiments automatic transmission 102 of the present invention.The hydraulic oil of discharging from oil pump 200 flows into base pressure operation valve 130 through hydraulic oil channel 202.This base pressure operation valve 130 is regulated the oil pressure of hydraulic oil, thereby produces these direct pressure operation valve 132 control base pressures of base pressure (being principal pressure), produces the activating pressure that is added on the parts 134 that are frictionally engaged.
With reference to figure 2, if base pressure operation valve 130 breaks down, then this valve can not produce enough big base pressure, thereby enough big activating pressure is added to be frictionally engaged on the parts 134.As a result, the torque capacity of the parts 134 that are frictionally engaged reduces, and these parts 134 that are frictionally engaged begin to slide.Therefore, only some is passed on from the torque that engine 106 is input to automatic transmission 102.
On the other hand, if direct pressure operation valve 132 breaks down, then essential activating pressure can not act on the parts 134 that are frictionally engaged again.As a result, these parts 134 that are frictionally engaged no longer transmit torque, so automatic transmission 102 becomes the neutral state.
In both cases, the load of engine 106 reduces, so the speed of engine 106 increases.In this case, the speed of the engine when automatic transmission 102 is in the neutral state is higher than the speed of engine when being frictionally engaged parts 134 slips, because when automatic transmission 102 is in the neutral state, does not almost have load on engine.
Fig. 3 is the clutch coupling action diagram of exemplary embodiments automatic transmission 102 of the present invention.Reference marker " C1 " to " C3 " and " B1 " to " B4 " represent to be frictionally engaged parts.Single circle in the drawings represents that contact component is engaged.At this moment, the torque that is input to automatic transmission 102 is sent to this contact component.Two circles among the figure only represent that contact component is engaged when engine braking, and solid circles represents that contact component is engaged, but do not transmit torque fully.
If because the fluid pressure that is added on the parts that are frictionally engaged of causing unusually of direct pressure operation valve 132 descends, then these parts that are frictionally engaged become and are engaged.For example with reference to figure 3, when automatic transmission 102 was positioned at " the 4th " retaining (i.e. the 4th speed), " C1 " and " C2 " engaged, and makes torque be carried.Though " C3 " and " B3 " also engaged, they do not transmit any torque.In this state, if owing to the oil pressure decline that acts in " C1 " and " C2 " on one or two appears making unusually in direct pressure operation valve 132, then these one or two parts that are frictionally engaged become and are engaged.That is, at least one in " C1 " and " C2 " begins to slide, and the transmission of torque has been ended in this slip.In this state, because the load of engine 106 reduces, so the relative engine 106 of turbine trip speed is exported torques and increased.Therefore, automatic transmission 102 becomes the neutral state.
Below according to flowchart text shown in Figure 4 program step by exemplary embodiments failure terms device execution of the present invention.
In step S102, this ECT_ECU 100 detects the duty (be throttle opening, engine speed, fuel straying quatity, enter air capacity etc.) of vehicle.Use the output torque of this duty calculation engine 106 or synchronous speed etc. then.
In step S104, this ECT_ECU 100 detects the duty (being MLP, turbine trip speed NT, output speed, AT solenoid valve signal etc.) of automatic transmission 102.Deduction turbine trip speed (engine speed) when this ECT_ECU100 is in the neutral state according to these calculated signals automatic transmission 102 then.
In step S106, this ECT_ECU 100 determines whether the speed change program of needs execution automatic transmission 102 according to MLP and AT solenoid valve signal.As the purpose of fault detection program, when changing, automatic transmission 102 operate as normal turbine trip speeds can get rid of this speed change program.When carrying out the speed-change process of automatic transmission 102 (when being "Yes" in step S106), this program stops.When not carrying out the speed-change process of automatic transmission 102 (when being "No" in step S106), this program enters step S108.
In step S108, this ECT_ECU 100 determines whether the difference between turbine trip speed and the synchronous speed surpasses predetermined value.When the difference between turbine trip speed and the synchronous speed surpasses predetermined value (when being "Yes" in step S108), this program enters step S110.When the difference between turbine trip speed and the synchronous speed is no more than predetermined value (when being "No" in step S108), program enters step S118.
In step S110, the difference (being Δ NT) between the turbine trip speed that these ECT_ECU 100 calculating are inferred and the actual turbine trip speed of detection.
This ECT_ECU 100 determines that whether this Δ NT is less than predetermined speed β in step S112.As definite Δ NT during less than predetermined speed β (when being "Yes" in step S112), program enters step S114.When definite Δ NT is not less than predetermined speed β (when being "No" in step S112), program enters step S116.
In step S114, this ECT_ECU 100 will determine that engine 106 is input to the torque transfer interruption of automatic transmission 102, determines that promptly automatic transmission 102 is in the neutral state.In this case, oil pressure is not applied on the parts 134 that are frictionally engaged, so can determine to exist on direct pressure operation valve 132 unusual.
In step S116, this ECT_ECU 100 parts 134 of will determining to be frictionally engaged are sliding.In this case, produce enough big base pressure (being principal pressure), thus diagnosable be on base pressure operation valve 130, to occur unusually.In this case, in fact only some is transmitted from the torque that engine 106 is input on the automatic transmission 102.Can think that the reason that produces big inadequately principal pressure is that oil pump 200 does not produce enough big pressure.Therefore can also determine, on oil pump 200 and base pressure operation valve 130, abnormal conditions occur.
In step S118, this ECT_ECU 100 determines that the torque that is input to automatic transmission 102 from engine 106 normally transmits.At this moment, the operation of automatic transmission 102 and fluid pressure line is normal.
In step S120, on behalf of the signal of determining state, this ECT_ECU 100 will output to display device or reservoir etc.Sort signal can be for example to show that automatic transmission 102 just at the signal of normal running, the signal that abnormal conditions appear in demonstration base pressure operation valve 130, shows that perhaps the signal of abnormal conditions etc. appears in direct pressure operation valve 132.When the speed of engine 106 increased, this signal can be diagnosed the state of automatic transmission 102.Therefore, can discern the unusual position of appearance easily, thereby help to change fast parts or Awaiting Parts etc.
Below according to said structure with in the operation of vehicle with the flowchart text exemplary embodiments failure terms of the present invention device under certain gear speed travel situations.
When vehicle when automatic transmission is in predetermined gear speed and travels, can detect the speed of (step S102) engine 106 or fuel injection amount etc.In addition, can detect the output speed or the turbine trip speed of automatic transmission 102, and calculate the synchronous speed (step S104) of this gear speed.When automatic transmission 102 is not in gearshift middle (in step S106 for "No" time), and the difference between turbine trip speed and the synchronous speed surpasses predetermined value (when promptly being "Yes" in step S108), deduction turbine trip speed in the time of can calculating (step S110) automatic transmission 102 and be in the neutral state and the difference between the actual engine speed.
When this difference is equal to or less than predetermined speed β (when promptly being "Yes" in step S112), can determine that automatic transmission 102 is in neutral state (step S114).This signal of determining is represented in output (step S120) then.Can determine according to this signal that then abnormal conditions take place the base pressure operation valve 130 of automatic transmission 102.
Fig. 5 illustrates the time dependent curve of eigenwert of exemplary embodiments automatic transmission of the present invention.Solid line (A) the expression output speed and the transmission gear ratio calculated synchronous speed of automatic transmission 102.The speed that dotted line (B) expression is frictionally engaged and detects when parts are subjected to partial action.The speed that dotted line (C) expression automatic transmission 102 detects when being in the neutral state.Deduction speed when solid line (D) expression automatic transmission 102 is in the neutral state, this speed is calculated according to the torque of input.
With reference to figure 5, automatic transmission 102 breaks down at time t (0).In time t (1), the difference between actual turbine trip speed and the synchronous speed surpasses predetermined value.Detecting automatic transmission 102 at this moment occurs unusual.
After elapsed time T, calculate at turbine trip speed (i.e. the NT of Tui Duaning) of inferring and the difference DELTA NT between the actual turbine trip speed at time t (2).For example, when the speed of measuring is NT (1) (being dotted line (C)), can calculate Δ NT (1).In this case, can determine: automatic transmission 102 is in the neutral state; On direct pressure operation valve 132, break down.On the other hand, when the speed that detects is Δ NT (2) (being dotted line (B)), can determine: the parts that are frictionally engaged are sliding; On base pressure operation valve 130, break down.
Can set this time T according to the feature (for example Chuan Shu amount of torque) of automatic transmission 102 or the state (for example gear speed) of automatic transmission 102.Therefore can accurately determine whether to break down.
In time t (3), promptly, export the signal of representing automatic transmission 102 states then through after determining the time (=t (3)-t (2)).Therefore, set to determine that by this way the time can accurately determine the state of automatic transmission 102.
Therefore, can utilize the eigenwert (i.e. the input speed of when not transmitting torque, inferring) of representing automatic transmission 102 states to make the criterion of determining, according to this criterion, can determine that engine 106 speed are increased to the reason greater than synchronous speed (i.e. the speed of calculating according to automatic transmission 102 output speeds and transmission gear ratio).That is, when automatic transmission 102 is in the neutral state that does not transmit any torque, can estimate, on direct pressure operation valve 132, break down.On the other hand, in the time of can not transmitting enough torques when being frictionally engaged the parts slip, can determine, occur unusual at base pressure operation valve 130.Therefore, can provide a kind of fault to determine device, this device can accurately be determined the reason that power source speed increases.
The present invention can not exceed spirit of the present invention or fundamental characteristics with other various particular forms enforcements.Therefore, embodiments of the invention are exemplary fully, do not have restrictedly, and scope of the present invention is determined by appending claims, determine that and can't help above-mentioned explanation the institute that occurs in meaning that is equal to claims and the scope changes and all comprises in the present invention.
Claims (7)
1. a device of determining TRANS FAILSAFE PROG when running car is characterized in that, this device comprises:
First pick-up unit (S106) is used to determine whether to carry out the speed change program of described automatic transmission;
Calculation element is according to the output speed and the transmission gear ratio calculating synchronous speed of described automatic transmission;
Second pick-up unit detects the input speed of described automatic transmission;
Apparatus for predicting is input to the torque of described automatic transmission according to car power source, infers when power transmits to interrupt the input speed when described automatic transmission is in neutral condition;
Second calculation element (S110) is as the speed change program (S106 that does not carry out described automatic transmission; NO) and first difference between described synchronous speed and the described input speed more than or equal to predetermined value (α) (S108; YES) time, second difference (Δ NT) between the input speed that calculating detects and the input speed of deduction; With
Fault is determined device, when described second difference is less than or equal to the second predetermined value (S112; YES) time, determine to have taken place first fault (S114) that described automatic transmission is in the neutral state, and work as described second difference greater than this second predetermined value (S112; NO) time, the parts that are frictionally engaged of determining to be used to set up the gear-change of automatic transmissions bit rate produce second fault (S116) of sliding.
2. device as claimed in claim 1, it is characterized in that, described fault is determined device (S112, S114, S116) when vehicle travels with predetermined gear speed, determines and described second fault that identification is slided about described first fault of neutral state and the parts (134) that are frictionally engaged.
3. device as claimed in claim 1 or 2 is characterized in that, also comprises: second pick-up unit (116) is used to detect the speed of vehicle power source; Described fault is determined device (S108, S112, S114, S116) when the speed of power source satisfies predetermined condition, and definite and identification relates to described first fault of neutral state and relates to described second fault that the parts that are frictionally engaged slide.
4. device as claimed in claim 1 or 2 is characterized in that, described automatic transmission (102) comprises first operation valve (132) and second operation valve (130), and these two valves are all controlled oil pressure; The control of this first operation valve (132) is used to set up the activating pressure of the parts that are frictionally engaged of gear-change of automatic transmissions bit rate, and this second operation valve (130) is regulated the pressure of the hydraulic oil of discharging in oil pump (200); Described first fault that relates to the neutral state is the fault of this first operation valve (132), is the fault of this second operation valve (130) and relate to described second fault that the parts that are frictionally engaged slide.
5. method of determining TRANS FAILSAFE PROG when vehicle ' is characterized in that comprising following steps:
A. first pick-up unit determines whether (S106) carries out the speed change program of described automatic transmission;
B. calculation element calculates synchronous speed according to the output speed and the speed ratio of described automatic transmission;
C. second pick-up unit detects the input speed of described automatic transmission;
D. apparatus for predicting is input to the torque of described automatic transmission according to car power source, infers when power transmits to interrupt the input speed when described automatic transmission is in neutral condition;
E. second calculation element (S110) is not being carried out the speed change program (S106 of described automatic transmission; NO) and first difference between described synchronous speed and the described input speed more than or equal to predetermined value (α) (S108; YES) time, second difference (Δ NT) between the input speed that calculating detects and the input speed of deduction; With
F. fault determines that device is less than or equal to the second predetermined value (S112 in described second difference; YES) time, determine first fault (S114) that described automatic transmission is in the neutral state has taken place, and in described second difference greater than this second predetermined value (S112; NO) time, the parts that are frictionally engaged of determining to be used to set up the gear-change of automatic transmissions bit rate produce second fault (S116) of sliding.
6. method as claimed in claim 5, it is characterized in that, when vehicle travels with predetermined gear speed, determine that in step F (S112, S114, S116) fault relates to described first fault of neutral state, described second fault that the parts that also relate to be frictionally engaged slide.
7. as claim 5 or 6 described methods, it is characterized in that, described first fault that relates to the neutral state is the fault that is contained in first operation valve (132) on the automatic transmission, the control of this operation valve is used to set up the activating pressure of the parts that are frictionally engaged (134) of gear-change of automatic transmissions bit rate, and described second fault that relates to the parts slip that is frictionally engaged is the fault that is contained in second operation valve (130) on the automatic transmission, and this operation valve is regulated from the pressure of the hydraulic oil of oil pump discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101002398A CN1296688C (en) | 2002-10-11 | 2003-10-10 | Device and method for determining fault of automatic transmission |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP298744/2002 | 2002-10-11 | ||
| CNB2003101002398A CN1296688C (en) | 2002-10-11 | 2003-10-10 | Device and method for determining fault of automatic transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1497251A CN1497251A (en) | 2004-05-19 |
| CN1296688C true CN1296688C (en) | 2007-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101002398A Expired - Fee Related CN1296688C (en) | 2002-10-11 | 2003-10-10 | Device and method for determining fault of automatic transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1296688C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4220494B2 (en) * | 2005-05-31 | 2009-02-04 | ジヤトコ株式会社 | Automatic transmission failure control device |
| CN102050109B (en) * | 2009-11-10 | 2014-04-02 | 通用汽车环球科技运作公司 | System and method for detecting and responding to the pressure loss in hydraulic automatic transmission |
| CN101799361B (en) * | 2010-01-27 | 2011-08-10 | 北京信息科技大学 | Fault diagnosis method and detection system of vehicle transmission |
| US8636620B2 (en) * | 2010-10-28 | 2014-01-28 | Jatco Ltd | Automatic transmission |
| CN102539141B (en) * | 2010-12-24 | 2016-06-15 | 标致·雪铁龙汽车公司 | The method and apparatus that vehicle automatic control change speed gear box accordance checks |
| KR20160064261A (en) * | 2014-11-27 | 2016-06-08 | 현대자동차주식회사 | Diagnostic method for shifting actuator of transmission |
| CN107882816B (en) * | 2016-09-30 | 2020-03-31 | 比亚迪股份有限公司 | Fault diagnosis and fault tolerance method and system for hydraulic control system of automatic gearbox |
| JP6520895B2 (en) * | 2016-11-15 | 2019-05-29 | トヨタ自動車株式会社 | Control device of power transmission device for vehicle |
| CN110985662A (en) * | 2020-02-28 | 2020-04-10 | 盛瑞传动股份有限公司 | Control method for preventing clutch fault of automatic transmission |
| CN111810629B (en) * | 2020-07-22 | 2022-01-07 | 钦州绿传科技有限公司 | Method for detecting and controlling failure of mechanical pump in vehicle and vehicle |
| CN113267334A (en) * | 2021-07-19 | 2021-08-17 | 盛瑞传动股份有限公司 | Method and device for judging hydraulic automatic transmission fault, vehicle and storage medium |
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| US5046175A (en) * | 1990-01-11 | 1991-09-03 | General Motors Corporation | Method of detecting clutch tie-up during transmission shifting |
| JPH11280895A (en) * | 1998-03-30 | 1999-10-15 | Mazda Motor Corp | Failure detection device for lock-up clutch |
| JPH11280883A (en) * | 1998-03-30 | 1999-10-15 | Mazda Motor Corp | Failure detection device of automatic transmission |
| CN1363790A (en) * | 2000-12-30 | 2002-08-14 | 现代自动车株式会社 | Fault diagnostic method for drive shaft speed sensor with automatic transmission |
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| US5046175A (en) * | 1990-01-11 | 1991-09-03 | General Motors Corporation | Method of detecting clutch tie-up during transmission shifting |
| JPH11280895A (en) * | 1998-03-30 | 1999-10-15 | Mazda Motor Corp | Failure detection device for lock-up clutch |
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| CN1497251A (en) | 2004-05-19 |
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