JP5783082B2 - Oil pump control device - Google Patents

Description

  The present invention relates to an oil pump control device that controls an oil pump that supplies oil to a torque converter mounted on a vehicle.

  As for a conventional oil pump control device, for example, a control device of Patent Document 1 is known. This control device uses a hydraulic circuit having a mechanical oil pump driven by an engine, an electric oil pump, and an oil passage to which oil (fluid) is supplied from the mechanical oil pump and the electric oil pump. It controls the oil supply to More specifically, this control device detects a change in the state of the transmission and the hydraulic circuit while the mechanical oil pump supplies oil to the oil passage by rotating the engine without the assistance of the starter. The electric oil pump is driven to supply oil from the electric oil pump to the oil passage.

JP 2004-286148 A

  However, in the control device of Patent Document 1, oil supply to the transmission is considered, but oil loss of the torque converter is not considered.

  That is, generally, a torque converter is mounted between the engine and the transmission. In a vehicle equipped with such a torque converter, oil is also supplied to the torque converter by driving one of the mechanical oil pump and the electric oil pump. In such a vehicle, when the oil pump is not driven (that is, when no oil is supplied to the torque converter) for a long time, the oil in the torque converter gradually drains from the gaps between the oil seals and valves, and torque Oil loss from the converter may occur. Note that if the engine is stopped and the vehicle is left in a state where the oil temperature in the transmission is high due to the use of the vehicle under heavy loads (traction of other vehicles, rough road driving, high speed driving, etc.), the torque converter will lose oil. It becomes easier to generate.

  When such oil loss in the torque converter occurs, the medium for transmitting engine power to the transmission side in the torque converter is reduced, and the power cannot be transmitted. Therefore, even if the clutch of the transmission is engaged, there is a problem in that power cannot be transmitted in the torque converter, so that the vehicle cannot be started immediately (that is, the vehicle start performance is deteriorated). In such a case, conventionally, it may take 20 seconds or more until the oil in the torque converter is filled and the vehicle can start.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an oil pump control device that can prevent a decrease in vehicle start performance due to oil loss of a torque converter.

In order to solve the above problems, an oil pump control device of the present invention includes an internal combustion engine, an input shaft, and an output shaft, and the output rotational speed of the internal combustion engine input to the input shaft is determined via the oil. a torque converter for transmitting the output shaft, a transmission that transmission or blocking the rotation speed of the output shaft, and a oil pump for supplying the oil to the torque converter, the output rotation of immediately after the start of the previous SL internal combustion engine If the speed ratio of the rotating speed of the output shaft against the velocity is equal to or greater than a predetermined threshold value, the oil pump is driven as the oil supply to the torque converter is a first feed amount, on the other hand, the When the speed ratio is less than the threshold value, the oil pump is driven so that the amount of oil supplied to the torque converter becomes a second supply amount that is larger than the first supply amount.

  In general, when oil is drained from the torque converter, it is difficult to transmit the rotational speed between the input shaft and the output shaft of the torque converter, so that the rotational speed of the input shaft (that is, the output rotational speed of the internal combustion engine) rises. The rise of the rotation speed of the output shaft becomes slow.

According to the above configuration, the rotational speed of the rise of the delay of the output shaft of the torque converter with respect to the rising of the output rotation speed of the internal combustion engine, determined by the speed ratio of the rotational speed of the output shaft to the output rotational speed immediately after engine start To do. That is, the speed ratio of less than the predetermined threshold value (if i.e., believed oil is missing from the torque converter), the oil pump, the oil supply to the torque converter, the velocity ratio is the predetermined threshold or less The oil supply amount increases in the above case (that is, when it is considered that oil is not drained from the torque converter), so the oil supply amount to the torque converter can be increased quickly according to the oil drainage of the torque converter. Thus, it is possible to prevent a decrease in vehicle start performance.

  According to the oil pump control device of the present invention, it is possible to provide an oil pump control device that can prevent a decrease in vehicle start performance due to oil loss of the torque converter.

1 is a schematic configuration diagram of an oil pump control device according to a first embodiment of the present invention. It is the figure which showed an example of the correspondence of speed ratio Eo and oil temperature T. It is the figure which showed an example of the rising of engine rotational speed Ne, and the rising of turbine rotational speed Nt. It is a flowchart explaining operation | movement of the oil pump control apparatus which concerns on 1st Embodiment of this invention. It is the structure schematic of the oil pump control apparatus which concerns on 2nd Embodiment and reference form of this invention. It is a flowchart explaining operation | movement of the oil pump control apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart explaining operation | movement of the oil pump control apparatus which concerns on the reference form of this invention. It is a figure explaining an example of the engine speed Nt in the reference form of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<< First Embodiment >>
<Overall configuration>
FIG. 1 is a schematic configuration diagram of an oil pump control device according to the first embodiment of the present invention.

  An oil pump control device 1 according to this embodiment is an oil pump control device mounted on a vehicle, and as shown in FIG. 1, between an engine (internal combustion engine) EG and an automatic transmission (transmission) AT. The electric oil pump (oil pump) P1 that supplies oil (fluid) to the torque converter TC disposed in the motor is controlled. More specifically, the automatic transmission AT sets the output rotational speed Nt of the torque converter TC. In the shut-off state, the amount of oil supplied from the electric oil pump P1 to the torque converter TC is controlled according to the delay in the rise of the output rotation speed Nt of the torque converter TC relative to the rise of the output rotation speed Ne of the engine EG. Is.

  The oil pump control device 1 includes an engine EG that is an example of an internal combustion engine, a torque converter TC that transmits or cuts off output torque of the engine EG, and an automatic transmission AT that changes or cuts off the output rotation speed Nt of the torque converter TC. And an electric oil pump P1 that supplies oil to the torque converter TC, various vehicle sensors S1 to S5, an ignition (IG) switch SW, detection results of the vehicle sensors S1 to S5, and an engine based on the IG switch SW. And a control device 3 for controlling the EG, the electric oil pump P1, and the automatic transmission AT.

  The engine EG is a known internal combustion engine that outputs power by burning a fuel such as a gasoline engine or a diesel engine in a combustion chamber. The power of the engine EG is output as a rotational force (torque) that rotates the crankshaft 4. The crankshaft 4 is connected to an input shaft 5 described later of the torque converter TC.

  The torque converter TC is a known torque converter that transmits the output torque of the engine EG input to the input shaft 5 to the output shaft 7 via oil.

  Here, the torque converter TC is disposed between the input shaft 5, the output shaft 7, the impeller 9 fixed to the input shaft 5, the turbine 11 fixed to the output shaft 7, and the impeller 9 and the turbine 11. And the oil filled in the torque converter TC. The input shaft 5 is connected to the crankshaft 4 of the engine EG, and is rotated at the same rotational speed as the rotational speed of the crankshaft 4 (that is, the output rotational speed (engine rotational speed) Ne of the engine EG). Is connected to an input shaft 15 described later of the automatic transmission AT.

  In this torque converter TC, the impeller 9 is rotated by the power of the engine EG, and the oil flows from the impeller 9 toward the turbine 11 so that torque is transmitted. At that time, the direction in which the oil flows is changed by the stator 13. Thus, the torque input to the input shaft 7 is increased and transmitted to the output shaft 7. Thereby, the output rotational speed of the engine EG input to the input shaft 5 is transmitted to the output shaft 7 via the oil.

  The automatic transmission AT is a known automatic transmission, and includes, for example, an input shaft 15, an output shaft 17, a plurality of planetary gear mechanisms R, a plurality of clutches C, and a plurality of brakes B, for example. .

  The input shaft 15 is connected to the output shaft 7 of the torque converter TC and is rotated at the same rotational speed as the rotational speed Nt of the rotating shaft 7 (that is, the output rotational speed (turbine rotational speed) of the torque converter TC). Further, the input shaft 15 is coupled to a predetermined gear of the first stage planetary gear mechanism R via a clutch C, for example. The gears of each planetary gear mechanism R are coupled to the gears of the other planetary gear mechanisms R via the clutch C, or are directly coupled, or connected to the brake B. The output shaft 17 is connected to a predetermined gear of the last stage planetary gear mechanism R, for example. The output of the output shaft 17 is output to a predetermined differential gear (not shown), and the driving wheel is rotationally driven by the differential gear based on the output. The connected state of the planetary gear mechanism R, the clutch C, and the brake B in FIG. 1 is an example.

  In the automatic transmission AT, the engagement / disengagement of each clutch C is controlled and the braking / release of each brake B is controlled according to the control from the control device 3. Depending on the combination of engagement / disengagement of each clutch C and braking / release of each brake B, the output rotational speed Nt of the torque converter TC input to the input shaft 15 is cut off or shifted at a desired speed ratio. , Output from the output shaft 17.

  The electric oil pump P1 is driven by a predetermined electric motor (not shown) and supplies oil stored in a predetermined oil reservoir (not shown) to the torque converter TC. Accordingly, the operation / stop and the discharge amount (that is, the amount of oil supplied to the torque converter TC) are controlled. By supplying oil from the electric oil pump P1, oil shortage due to oil loss in the torque converter TC is solved.

  Each of the vehicle sensors S1 to S5 includes an engine rotation speed sensor S1, a turbine rotation speed sensor S2, a shift position sensor S3, a vehicle speed sensor S4, and an oil temperature sensor S5.

  The engine rotation speed sensor S1 detects the rotation speed (namely, engine rotation speed) Ne of the output shaft (crankshaft) 4 of the engine EG and outputs the detection result to the control device 3.

  The turbine rotation speed sensor S2 detects the rotation speed (that is, the turbine rotation speed) Nt of the output shaft 7 of the torque converter TC, and outputs the detection result to the control device 3.

  The shift position sensor S3 detects the shift position (operation position) of the shift lever (operation lever) 21 and outputs the detection result to the control device 3. Here, the shift position includes a parking (P) range that stops the vehicle on which the oil pump control device 1 is mounted, and a drive (D) range that enables the vehicle to start.

  For example, the vehicle speed sensor S4 detects the vehicle speed of the vehicle based on the rotational speed of the drive wheel of the vehicle on which the oil pump control device 1 is mounted, and outputs the detection result to the control device 3.

  The oil temperature sensor S5 detects the oil temperature T in the torque converter TC and outputs the detection result to the control device 3.

  The IG switch SW is a switch that accepts an operation for instructing start of the engine EG. The on operation is an operation for instructing the start of the engine EG, and the off operation is an operation for stopping the engine EG. Here, the engine EG is started when the engine start condition including the ON operation of the IG switch SW is satisfied, and the engine EG is stopped when the engine stop condition including the OFF operation of the IG switch SW is satisfied.

  The control device 3 includes (a) control of starting / stopping the engine EG, (b) control of shifting and shutting off at the automatic transmission AT, and (c) operation / stopping of the electric oil pump P1 and discharge amount thereof. Take control.

  More specifically, in (a), the control device 3 detects the shift position based on the detection result of the shift position sensor S3. Then, when the shift position is in the P range, the control device 3 starts the engine EG when the IG switch SW is turned on and the engine start condition is satisfied, and the IG switch SW is turned off and the engine stop condition When is established, the engine EG is stopped.

  In (b), when the shift position is in the P range, the control device 3 controls the automatic transmission AT so that the rotational speed of the input shaft 15 is cut off and is not transmitted to the output shaft 17. When the shift position is in the D range, the rotational speed of the input shaft 15 is shifted and transmitted to the output shaft 17 at a gear ratio corresponding to each detection result of the engine rotational speed sensor S1 and the vehicle speed sensor S4. Control the automatic transmission AT.

In (c), the control device 3 determines that the engine is in the P range (that is, in a state where the rotational speed of the input shaft 15 is cut off and not transmitted to the output shaft 17 in the automatic transmission AT). When the EG is started, based on the detection results of the engine rotation speed sensor S1 and the turbine rotation speed sensor S2, the turbine rotation speed (that is, output) with respect to the rise of the engine rotation speed (that is, the rotation speed of the input shaft 5) Ne. The rising speed of the rotation speed of the shaft 7) Nt is detected. Further, the control unit 3, the detection result of the oil temperature sensor S5 (i.e., oil temperature T in the torque converter TC) depending on, sets the first threshold value used in the following determination (change). For example, the control device 3 changes the first threshold value to be lower as the oil temperature T is higher.

  Then, the control device 3 compares the detected delay with the set first threshold, and when the delay is equal to or less than the first threshold, the amount of oil filling in the torque converter TC is not insufficient. And the discharge amount of the electric oil pump P1 is controlled so that the oil supply amount to the torque converter TC becomes the first supply amount. On the other hand, if the delay is larger than the first threshold value, the torque converter It is determined that the oil filling amount in the TC is insufficient, and the discharge amount of the electric oil pump P1 is set so that the oil supply amount to the torque converter TC becomes a second supply amount that is larger than the first supply amount. Control. The first supply amount is an optimum supply amount when the oil filling amount in the torque converter TC is not insufficient, and is a constant value or a value that changes according to the engine rotational speed Ne.

  That is, when the delay is greater than the first threshold (that is, when it is determined that oil has been removed from the torque converter), the control device 3 determines that the amount of oil supplied to the torque converter TC is less than the delay. The electric oil pump P1 is controlled so as to increase more than the amount of oil supplied to the torque converter TC in the case where it is equal to or less than the first threshold (that is, when it is determined that oil is not drained from the torque converter TC).

More specifically, for example, a speed ratio E (= Nt / Ne) between the engine rotational speed Ne immediately after engine startup and the turbine rotational speed Nt is used as the delay index. Then, depending on whether or not the speed ratio E is less than a second threshold (predetermined threshold) , whether or not the delay is greater than the first threshold (that is, whether or not oil is drained from the torque converter TC). Is determined.

  The second threshold value is a threshold value corresponding to the first threshold value when the index of delay is defined as a speed ratio E. Here, a predetermined ratio Y of the speed ratio Eo (where Y is 0 <Y ≦ 1) (That is, the second threshold = Eo × Y). The speed ratio Eo is the speed ratio E when the oil filling amount in the torque converter TC is not insufficient. The speed ratio Eo is a value that changes in accordance with changes in the engine rotational speed Ne and the oil temperature T.

  Here, as shown in FIG. 2, a plurality of correspondence relationships M between the speed ratio Eo and the oil temperature T are set in the control device 3 for each engine speed Ne. In FIG. 2, four correspondence relationships M1, M2, M3, and M4 are illustrated as an example. Each of the correspondence relationships M1, M2, M3, and M4 corresponds to a different engine speed Ne. Such a correspondence relationship M can be obtained from experimental data, for example.

  And the control apparatus 3 calculates | requires speed ratio E (= Nt / Ne) based on detection result Ne and Nt of engine rotational speed sensor S1 and turbine rotational speed sensor S2. The control device 3 obtains a speed ratio Eo corresponding to the detection result (oil temperature) T of the oil temperature sensor S5 using the correspondence M corresponding to the detection result Ne of the engine rotation speed sensor S1, and the speed ratio A value obtained by multiplying Eo by a predetermined ratio Y is set as the second threshold value (= Eo × Y). Then, the control device 3 determines whether or not the obtained speed ratio E is less than the second threshold value. When the obtained speed ratio E is less than the second threshold value, the delay is the When it is determined that the oil amount in the torque converter TC is larger than the first threshold value (that is, the oil filling amount in the torque converter TC is insufficient), on the other hand, when the obtained speed ratio E is equal to or larger than the second threshold value, the delay is It is determined that it is equal to or less than the first threshold (that is, the amount of oil filling in the torque converter TC is not insufficient).

  FIG. 3 is a diagram showing an example of the rise of the engine rotation speed Ne and the rise of the turbine rotation speed Nt. Nt1 in FIG. 3 is an example of a rise in the turbine rotation speed Nt when the oil filling amount in the torque converter TC is not insufficient, and Nt2 is a shortage of oil filling amount in the torque converter TC. It is an example of the rise of the turbine rotational speed Nt in the case of being. As can be seen from FIG. 3, as the amount of oil filling in the torque converter TC becomes insufficient, the rise of the turbine rotational speed Nt becomes slower, so the speed ratio E = Nt / Ne becomes smaller. Using this characteristic, when the speed ratio E is less than the second threshold value, it is determined that the amount of oil filling in the torque converter TC is insufficient, while the speed ratio E is the second ratio. If it is equal to or greater than the threshold value, it is determined that the amount of oil filling in the torque converter TC is not insufficient.

<Description of operation>
The operation of the oil pump control device 1 will be described with reference to FIG. FIG. 4 is a flowchart for explaining the operation of the oil pump control device 1.

  In step U1, the IG switch SW is turned on in a state where the shift position is in the P range (that is, a state where the output rotational speed Nt of the torque converter TC is blocked by the automatic transmission AT and is not transmitted to the output shaft 17). The engine EG is started by the control device 3 when the engine start condition is satisfied.

  In step U2, the detection result of the engine speed sensor S1 (namely, the engine speed) Ne, the detection result of the turbine speed sensor S2 (namely, the turbine speed) Nt, and the detection result of the oil temperature sensor S5 (namely, Oil temperature T is acquired by the control device 3.

  In step U3, the control device 3 obtains the correspondence M corresponding to the engine speed Ne acquired in step U2 from the plurality of correspondences M set in advance, and uses the obtained correspondence M. Thus, the speed ratio Eo corresponding to the oil temperature T acquired in step U2 is obtained, and the second threshold value (= speed ratio Eo × ratio Y) is calculated from the obtained speed ratio Eo. Further, the control device 3 calculates the speed ratio E (= Nt / Ne) from the engine rotational speed Ne and the turbine rotational speed Nt obtained in step U2.

  In step U4, the control device 3 determines whether or not the speed ratio E is less than the second threshold (that is, whether or not the delay of the turbine rotation speed Nt with respect to the engine rotation speed Ne is greater than the first threshold). A determination is made. As a result of the determination, if the speed ratio E is equal to or greater than the second threshold (that is, the delay is equal to or less than the first threshold), the amount of oil filled in the torque converter TC is not insufficient by the control device 3. If it is determined and the process proceeds to step U5, and the speed ratio E is less than the second threshold value (that is, if the delay is greater than the first threshold value), the control device 3 causes the torque converter TC to It is determined that the oil filling amount is insufficient, and the process proceeds to step U6.

  In step U5, the discharge amount of the electric oil pump P1 is controlled by the control device 3 so that the oil supply amount to the torque converter TC becomes the first supply amount. Then, the process ends.

  On the other hand, in step U6, the discharge amount of the electric oil pump P1 is controlled by the control device 3 so that the oil supply amount to the torque converter TC becomes a second supply amount larger than the first supply amount. Then, the process returns to step U2.

  By the above operation, when the speed ratio E is less than the second threshold value (that is, when the oil filling amount in the torque converter TC is insufficient), the process U4 → U6 → U2 → U3 → U4 is repeated. Until the speed ratio E becomes equal to or higher than the second threshold (that is, until NO at U4), the oil supply to the torque converter TC is the oil supply amount when the oil filling amount in the torque converter TC is not insufficient. The discharge amount of the electric oil pump P1 is controlled so as to be larger than the (first supply amount). As a result, when the oil filling amount in the torque converter TC is insufficient, the oil supply amount to the torque converter TC is quickly increased to eliminate the shortage of oil filling amount in the torque converter TC. This prevents a decrease in vehicle start performance.

<Main effects>
According to the oil pump control device 1 configured as described above, in the state where the automatic transmission AT blocks the rotational speed Nt of the output shaft 7 of the torque converter TC, the output shaft with respect to the rise of the output rotational speed Ne of the engine EG. 7 is larger than the first threshold (that is, when it is considered that oil has been removed from the torque converter T), the electric oil pump P1 supplies the oil supply amount to the torque converter TC. More than the oil supply amount when the delay is equal to or less than the first threshold (that is, when it is considered that oil is not drained from the torque converter TC). In addition, the amount of oil supplied to the torque converter TC can be increased, and a decrease in vehicle start performance can be prevented.

<< Second Embodiment >>
In the first embodiment, the case where the electric oil pump (oil pump) P1 is used has been described, but in this embodiment, the case where a mechanical oil pump (oil pump) is used will be described.

<Overall configuration>
FIG. 5 is a schematic configuration diagram of an oil pump control device according to the second embodiment of the present invention.
An oil pump control device 1B according to this embodiment is obtained by replacing the electric oil pump P1 with a mechanical oil pump P2 in the oil pump control device 1 according to the first embodiment.

  The mechanical oil pump P2 is driven by the power of the engine EG, and supplies oil stored in a predetermined oil storage section (not shown) to the torque converter TC, according to the rotational speed Ne of the engine EG. The discharge amount (that is, the oil supply amount to the torque converter TC) is controlled.

  The control device 3B of this embodiment includes (a) start / stop control of the engine EG, (b) control of shift and cut-off in the automatic transmission AT, and (c ′) discharge amount of the mechanical oil pump P2. The engine speed Ne for controlling the engine is controlled. Since (a) and (b) are the same as (a) and (b) of the first embodiment, detailed description thereof is omitted.

  (C ′) is the same as (c) in the first embodiment except that the engine EG is controlled as follows instead of controlling the electric oil pump P1.

  That is, when the delay is equal to or less than the first threshold value (that is, when the speed ratio E is equal to or greater than the second threshold value), the control device 3B does not have an insufficient oil filling amount in the torque converter TC. And the engine EG is controlled so that the engine rotational speed Ne becomes the first rotational speed Ne1. Accordingly, the mechanical oil pump P2 is driven with a discharge amount corresponding to the first rotational speed Ne1, and oil is supplied to the torque converter TC with an oil supply amount (first supply amount) corresponding to the discharge amount. The first rotational speed Ne1 is an optimum engine rotational speed (engine rotational speed at idling) when the oil filling amount in the torque converter TC is not insufficient.

  On the other hand, when the delay is larger than the first threshold (that is, when the speed ratio E is less than the second threshold), the control device 3B has insufficient oil filling amount in the torque converter TC. And the engine EG is controlled so that the engine rotational speed Ne becomes the second rotational speed Ne2 that is higher than the first rotational speed Ne1. As a result, the mechanical oil pump P2 is driven according to the second rotational speed Ne2 that is faster than the first rotational speed Ne1, so that the torque is increased with an oil supply amount (second supply amount) larger than the first supply amount. Supply oil to converter TC.

  That is, when the delay is greater than the first threshold (that is, when it is determined that oil has drained from the torque converter), the control device 3B determines that the oil supply amount to the torque converter TC is less than the delay. Mechanical oil is controlled through the control of the engine EG so as to increase more than the amount of oil supplied to the torque converter TC in the case where it is equal to or less than the first threshold (that is, when it is determined that oil is not drained from the torque converter). The discharge amount of the pump P2 is controlled.

<Description of operation>
The operation of the oil pump control device 1B will be described based on FIG. FIG. 6 is a flowchart for explaining the operation of the oil pump control device 1B.

  Since FIG. 6 is obtained by replacing the respective steps U5 and U6 of FIG. 4 with the respective steps U5B and U6B, the description of the respective steps U1, U3 and U4 is omitted, and the description of each of the steps U5B and U6B is mainly described. To do.

  In step U4, if the result of determination in step U4 is that the speed ratio E is greater than or equal to the second threshold (that is, the delay is less than or equal to the first threshold), the process proceeds to step U5B, while the speed is If the ratio E is less than the second threshold (that is, if the delay is greater than the first threshold), the process proceeds to step U6B.

  In step U5B, it is determined by the control device 3B that the oil filling amount in the torque converter TC is not insufficient, and the engine EG is controlled so that the engine rotational speed Ne becomes the first rotational speed Ne1. As a result, the mechanical oil pump P2 is driven at a discharge amount corresponding to the first rotational speed Ne1, and the oil supply amount from the mechanical oil pump P2 to the torque converter TC becomes the first supply amount corresponding to the discharge amount. . Then, the process ends.

  On the other hand, in step U6B, it is determined by the control device 3B that the oil filling amount in the torque converter TC is insufficient, and the engine rotational speed Ne becomes the second rotational speed Ne2 that is larger than the first rotational speed Ne1. Thus, the engine EG is controlled. Accordingly, the mechanical oil pump P2 is driven at a discharge amount corresponding to the second rotation speed Ne2 that is faster than the first rotation speed Ne1, and the oil supply amount from the mechanical oil pump P2 to the torque converter TC is the discharge amount. According to the second supply amount (that is, a supply amount larger than the first supply amount). Then, the process returns to step U2.

  By the above operation, when the speed ratio E is less than the second threshold value (that is, when the oil filling amount in the torque converter TC is insufficient), the process U4 → U6B → U2 → U3 → U4 is repeated. Thus, until the speed ratio E becomes equal to or higher than the second threshold (that is, until NO at U4), the oil supply to the torque converter TC is the oil when the oil filling amount in the torque converter TC is not insufficient. The discharge amount of the mechanical oil pump P2 is controlled via the engine EG so as to be larger than the supply amount (first supply amount). Thereby, when the oil filling amount in the torque converter TC is insufficient, the oil supply amount to the torque converter TC is quickly increased, and the shortage of the oil filling amount in the torque converter TC is resolved. Thereby, the fall of vehicle start performance is prevented.

<Main effects>
According to the oil pump control device 1B configured as described above, the same effect as that of the first embodiment can be obtained by using the mechanical oil pump P2.

≪Reference form≫
In the second embodiment, based on the delay of the turbine rotation speed Nt for the engine rotational speed Ne, it is determined whether the oil shortage in the torque converter TC, but the engine EG is controlled in accordance with the determination result, the following In the reference embodiment to be described , based on the oil temperature in the torque converter TC when the engine is stopped and the elapsed time from the time when the engine is stopped until the next engine start (that is, the shortage amount of oil in the torque converter TC (that is, The amount of oil omission) is estimated, and the engine EG is controlled according to the estimation result.

<Overall configuration>
As shown in FIG. 5, an oil pump control device 1 </ b> C according to this reference embodiment is obtained by replacing the control device 3 with a control device 3 </ b> C in the oil pump control device 1 </ b> B according to the second embodiment.

  The control device 3C performs (a ′) start / stop control of the engine EG, and (b) shift and cutoff control in the automatic transmission AT. Said (b) is the same as the case of 2nd Embodiment (hence the case of 1st Embodiment).

  In (a ′), when the IG switch SW is turned off and the engine stop condition is satisfied, the control device 3C stops the engine EG. At that time, the control device 3C detects the oil temperature Tf in the torque converter TC when the engine is stopped based on the detection result of the oil temperature sensor S5, and stores the detection result in a predetermined storage unit. Further, the control device 3C measures an elapsed time Δt1 from when the engine is stopped to when the next engine is started.

  When the IG switch SW is turned on and the engine start condition is satisfied, the control device 3C starts the engine EG, and the elapsed time from the previous engine stop time counted as described above to the current engine start time. Based on Δt1 and the oil temperature Tf stored in the predetermined storage unit, an oil loss amount Q1 from the torque converter TC during an elapsed time Δt1 from the previous engine stop to the current engine start is obtained.

  This oil dropout amount Q1 increases as the oil temperature T in the torque converter TC increases, and increases as the elapsed time from when the engine stops. Here, for example, a correspondence relationship between the elapsed time Δt1 and the oil temperature Tf and the oil loss amount Q1 is set in the control device 3C, and the control device 3 uses the correspondence relationship to measure the elapsed time Δt1. Based on the stored oil temperature Tf, an oil loss amount Q1 is obtained.

  Then, the control device 3C obtains an oil amount Q2 in the torque converter TC at the time of starting the engine from the obtained oil loss amount Q1, and based on the oil amount Q2, from the oil amount Q3 necessary for the creep start of the vehicle. Is calculated as a discharge amount (a discharge amount of the mechanical oil pump P2) required to fill the shortage amount Q4 in a predetermined second ΔT2 (for example, 2 seconds) after the engine is started. A corresponding engine speed Nt1 is calculated. Then, control device 3C drives engine EG at the calculated engine speed Nt1 immediately after engine EG is started.

  Then, the control device 3C drives the engine EG at the engine rotation speed Nt1 until a predetermined second Δt2 elapses immediately after the engine is started, and when a predetermined second Δt2 elapses, the normal engine rotation speed (engine rotation speed during idling) Nt2 Return to.

<Description of operation>
Next, the operation of the oil pump control device 1C will be described with reference to FIG. FIG. 7 is a flowchart for explaining the operation of the oil pump control device 1C.

  In Step V1, when the IG switch SW is turned off and the engine stop condition is satisfied, the control device 3C stops the engine EG.

  In step V2, the control device 3C detects the oil temperature (that is, the oil temperature in the torque converter TC) Tf when the engine is stopped based on the detection result of the oil temperature sensor S5, and the detection result is a predetermined value. Is stored in the storage unit. In step V3, the control device 3C starts measuring the elapsed time Δt1 from when the engine is stopped to when the next engine is started.

  In step V4, when the IG switch SW is turned on and the engine EG start condition is satisfied, the process proceeds to step V5, where the control device 3C starts the engine EG and the elapsed time Δt1 of step V3. The time measurement is ended, and an oil loss amount Q1 in the torque converter TC at the time of starting the engine is obtained based on the measured elapsed time Δt1 and the oil temperature Tf stored in step V2.

  In step V6, the control device 3C obtains the oil amount Q2 in the torque converter TC at the time of starting the engine from the obtained oil missing amount Q1, and starts creeping of the vehicle based on the oil amount Q2. The deficient amount Q4 (= Q3-Q2) from the required oil amount (oil amount in the torque converter TC) Q3 is obtained, and the deficient amount Q4 is filled within Δt2 for a predetermined second (for example, 2 seconds) immediately after the engine is started. An engine rotational speed Nt1 corresponding to the amount of discharge required for this (that is, the amount of discharge of the mechanical oil pump P2) is calculated.

  In step V7, the engine EG is controlled by the control device 3C so that the engine speed Nt = Nt1 immediately after the engine is started. As a result, the oil supply amount from the mechanical oil pump P2 to the torque converter TC is increased from the normal oil supply amount (that is, the oil supply amount when the shortage amount Q4 is zero), and a predetermined number of seconds immediately after the engine is started. The oil shortage in the torque converter TC is resolved between Δt2.

  In step V8, if the predetermined time Δt2 has not elapsed since immediately after starting the engine, the process returns to step V7. On the other hand, if the predetermined time Δt2 has elapsed since immediately after starting the engine, the process proceeds to step V9. The engine EG is controlled so that the engine rotation speed Nt becomes a normal engine rotation speed (engine rotation speed during idling) Nt2. Thereby, the oil supply amount from the mechanical oil pump P2 to the torque converter TC is returned to the normal oil supply amount. Then, the process ends.

  With this operation, in this oil pump control device 1C, as indicated by G1 in FIG. 8, the engine rotation speed Nt is set to the conventional value (G2) for a predetermined second (for example, 2 seconds) Δt2 immediately after engine start t1. The engine speed Nt1 is faster than the engine speed Nt2. As a result, the oil amount in the torque converter TC is filled up to the oil amount Q3 necessary for the creep start of the vehicle within a predetermined time Δt2 immediately after the engine start t1, and the vehicle can start creeping.

  FIG. 8 shows an example (G1) of the time change of the engine speed Nt from the engine start time t1 in the oil pump control device 1C and the time change of the engine speed Nt from the engine start time t1 in the conventional case. An example (G2) is shown.

<Main effects>
According to the oil pump control device 1C configured as described above, the torque converter at the time of engine start is calculated using the oil temperature Tf at the time of engine stop and the elapsed time Δt1 from the time of engine stop to the next engine start. The amount of oil loss Q1 in the TC is estimated, and based on the estimation, the amount of oil shortage in the torque converter TC (that is, the amount of oil shortage relative to the amount of oil necessary for vehicle creep start) is determined for a predetermined number of seconds immediately after the engine is started. The engine rotation speed Nt1 that can be filled with Δt2 is calculated, and the engine EG is driven at the engine rotation speed Nt1 immediately after the engine is started. As a result, when the oil filling amount in the torque converter TC is insufficient, the oil supply to the torque converter TC is performed in the same manner as in the second embodiment within a predetermined time Δt2 immediately after the engine is started (that is, quickly). The amount is increased, and the shortage of the oil filling amount in the torque converter TC is resolved, thereby preventing the vehicle start performance from being deteriorated.

≪Attached matters≫
As mentioned above, although preferred embodiment and reference form of this invention were described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to such an example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. It is understood.

In addition, the invention in which the reference form is combined with either the first or second embodiment is naturally understood to belong to the technical scope of the present invention.

  The present invention is suitable for application to an oil pump control device that prevents a decrease in vehicle start performance due to oil loss in a torque converter.

1, 1B, 1C Oil pump control device 3, 3B control device 4 Crankshaft 5,15 Input shaft 7,17 Output shaft 19 Oil pan C Clutch B Brake EG Engine (Internal combustion engine)
TC Torque converter P1 Electric oil pump (oil pump)
P2 Mechanical oil pump (oil pump)
Ne Output rotation speed of engine Nt Output rotation speed of torque converter

Claims (1)

An internal combustion engine;
A torque converter having an input shaft and an output shaft, and transmitting the output rotational speed of the internal combustion engine input to the input shaft to the output shaft via oil;
A transmission for shifting or blocking the rotational speed of the output shaft;
An oil pump for supplying the oil to the torque converter;
With
If the speed ratio of the rotating speed of the output shaft against the output rotational speed immediately after the start of the previous SL internal combustion engine is equal to or greater than a predetermined threshold value, the oil pump, the oil supply amount is first feed to the torque converter On the other hand, when the speed ratio is less than the threshold value, the oil pump causes the oil supply amount to the torque converter to be a second supply amount that is greater than the first supply amount. An oil pump control device that is driven.

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