Control device and control method for vehicle

Abstract

A vehicle control device includes: real drag torque calculating means a1 which calculates the drag torque of a power transfer mechanism; lubricating oil flow rate calculating means a3 which determines the flow rate of lubricating oil according to an real drag torque; reference drag torque calculating means a2 which calculates a reference drag torque as a reference; reference lubricating oil flow rate calculating means a4 which calculates a reference lubricating oil flow rate according to the reference drag torque; correction rate calculating means a5 which calculates a correction value corresponding to the rate of correction of the lubricating oil flow rate according to the lubricating oil flow rate and reference lubricating oil flow rate; and flow rate correction means a7 which outputs a drive signal to an actuator which controls the lubricating oil flow rate according to the correction rate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a control device as an embodiment of the present invention.

FIG. 2 is a skeleton diagram of an automatic transmission system including a power train control unit 100 as shown in FIG. 1.

FIG. 3 is a block diagram illustrating an electric control system in the control units as shown in FIG. 2.

FIG. 4 shows an example of a drag torque calculation method in the real drag torque calculating means a1 as shown in FIG. 1.

FIG. 5 shows an example of timing for drag torque calculation as shown in FIG. 1.

FIG. 6 shows an example of correlation between drag torque and lubricating oil flow rate as used in the actual lubricating oil flow rate calculating means a3 and reference lubricating oil flow rate calculating means a4.

FIG. 7 shows an example of the correction rate calculating means a5 as shown in FIG. 1.

FIG. 8 shows an example of the calculation flow chart for the correction rate calculating means a5 as shown in FIG. 1.

FIG. 9 shows an example of correction rate determination as shown in FIG. 8.

FIG. 10 shows an example of the method of correction by the flow rate correction means a7 as shown in FIG. 1.

FIG. 11 shows an example of the range for fault diagnosis by the flow rate diagnosis means a6 as shown in FIG. 1.

FIG. 12 shows an example of the reference drag torque calculating means a2 as shown in FIG. 1.

FIG. 13 shows an example of the learning map for the correction learning means a10 as shown in FIG. 1.

FIG. 14 shows an example of the time chart after start of correction as shown in FIG. 1.

FIG. 15 shows an example of the diagnosis flow chart in which the deviation of the actual flow rate from the reference does not converge and an NG decision is made.

FIG. 16 shows a flow chart for the example as shown in FIG. 11.

FIG. 17 shows an example of setting diagnostic thresholds B and V in FIG. 15 and FIG. 16.

FIG. 18 shows an example of the time chart for learning as shown in FIG. 19.

FIG. 19 is an example of the learning flow chart for the example as shown in FIG. 1.

FIG. 20] is a skeleton diagram of an example of a second system configuration including a vehicle control device with an automatic transmission according to another embodiment of the present invention.

Claims

1. A control method for a vehicle with an automatic transmission including a power transfer mechanism using lubricating oil, comprising: determining a lubricating oil flow rate based on a drag torque of the power transfer mechanism;taking in condition information on the power transfer mechanism and determining a reference lubricating oil flow rate based on a reference drag torque obtained in accordance with the condition information;determining a correction value corresponding to a correction flow rate of the lubricating oil based on the lubricating oil flow rate and the reference lubricating oil flow rate; andcontrolling the lubricating oil flow rate in accordance with the correction value.

2. A control device for a vehicle with an automatic transmission including a power transfer mechanism using lubricating oil, comprising: a drag torque determining section for determining a drag torque of the power transfer mechanism;a lubricating oil flow rate determining section for determining a flow rate of the lubricating oil based on the drag torque;a reference drag torque determining section which takes in condition information on the power transfer mechanism and determines a reference drag torque to be a reference value in accordance with the condition information;a reference lubricating oil flow rate determining section for determining a reference lubricating oil flow rate based on the reference drag torque;a correction value determining section for determining a correction value corresponding to a correction rate of the lubricating oil flow rate based on the lubricating oil flow rate and the reference lubricating oil flow rate; anda flow rate correcting section for outputting a signal for operating to an actuator, which controls the lubricating oil flow rate, in accordance with the correction value.

3. The vehicle control device according to claim 2, wherein the drag torque determining section determines the drag torque based on an output of a flow rate sensor for the lubricating oil or a pressure sensor for the lubricating oil or a drag torque sensor.

4. The vehicle control device according to claim 2, further comprising a correction value learning section for leaning the correction value obtained by the correction value determining section.

5. The vehicle control device according to claim 2, wherein, when the lubricating oil flow rate is lower than the reference lubricating oil flow rate, the correction value is determined by differences between the two so as to increase the lubricating oil flow rate.

6. The vehicle control device according to claim 2, wherein, when the lubricating oil flow rate is higher than the reference lubricating oil flow rate, the correction value is determined by differences between the two so as to decrease the lubricating oil flow rate.

7. The vehicle control device according to claim 2, wherein, when the power transfer mechanism is in a transitional state, correction of the lubricating oil flow rate according to the correction value is stopped.

8. The vehicle control device according to claim 2, wherein the power transfer mechanism is a wet clutch constituting a twin clutch used for a twin clutch type automatic transmission.

9. The vehicle control device according to claim 2, further comprising a lubricating oil flow rate diagnosing section for making a diagnosis of the lubricating oil flow rate by using the correction value and giving a warning to a driver in accordance with a result of the diagnosis.

10. The vehicle control device according to claim 2, wherein the power transfer mechanism is provided between an engine and an input shaft of the automatic transmission; andwherein the drag torque determining section determines the drag torque based on change in rotation speed of the input shaft during a neutral state of the automatic transmission after switching the power transfer mechanism from its engaged state to its disengaged state.

11. The vehicle control device according to claim 2, wherein the power transfer mechanism is a mechanism constituting a twin clutch in a twin clutch type automatic transmission; the twin clutch is capable of switching engage/disengage of two input shafts of the automatic transmission to each other for an output shaft; and one of gear positions of the automatic transmission is set in pre-shift state on a disengaged-input shaft of the two input shafts;wherein the drag torque determining section determines the drag torque based on change in rotation speed of the input shaft being in pre-shift motion, during a neutral state after switching the power transfer mechanism from its engaged state to its disengaged state.

12. The vehicle control device according to claim 2, further comprising a storage section which stores a characteristic of correlation between the lubricating oil flow rate and the drag torque by a plurality of maps or tables for each lubricating oil temperature and/or rotation speed,wherein the lubricating oil determining section and the reference lubricating oil flow rate determining section calculate the lubricating oil flow rate and the reference lubricating oil flow rate from the drag torque and the reference drag torque by referencing to the maps or tables, respectively.

13. The vehicle control device according to claim 2, wherein the power transfer mechanism is a mechanism which constitutes at least either clutch for an input shaft or an assist clutch in a torque assist type automatic transmission.

14. A control device for a vehicle with an automatic transmission including a power transfer mechanism using lubricating oil, comprising: a drag torque determining section for determining a drag torque of the power transfer mechanism;a reference drag torque determining section which takes in condition information on the power transfer mechanism and determines a reference drag torque to be a reference value in accordance with the condition information;a correction value determining section which compares the drag torque with the reference drag torque and determines a correction value corresponding to a correction rate of the lubricating oil flow rate based on a result of the comparison; anda flow rate correcting section for outputting a signal for operating to an actuator, which controls the lubricating oil flow rate, in accordance with the correction value.

15. A control device for a vehicle with an automatic transmission including a power transfer mechanism using lubricating oil, wherein a lubricating oil flow rate for the power transfer mechanism is controlled so that a drag torque of the power transfer mechanism remains unchanged under a predetermined condition or driving range.

16. A control method for a vehicle with an automatic transmission including a power transfer mechanism using lubricating oil, comprising: determining a drag torque of the power transfer mechanism;taking in condition information on the power transfer mechanism and determining a reference drag torque obtained in accordance with the condition information;determining a correction value corresponding to a correction flow rate of the lubricating oil based on the drag torque and the reference drag torque; andcontrolling the lubricating oil flow rate in accordance with the correction value.

17. The vehicle control device according to claim 14, wherein, when the drag torque is lower than the reference drag torque, the correction value is determined so as to increase the lubricating oil flow rate.

18. The vehicle control device according to claim 14, wherein, when the drag torque is higher than the reference drag torque, the correction value is determined so as to decrease the lubricating oil flow rate.