Vehicle control apparatus and method

Abstract

A vehicle control apparatus and method that control a vehicle equipped with a driving source and an automatic transmission connected to the driving source are provided. The vehicle control apparatus and method increase a driving force by at least one of the increase in output from the driving source and the increase in a speed ratio of the automatic transmission, when the vehicle is traveling. The vehicle control apparatus and method detects a request for passing a lead vehicle, and performs a limit control when the request for passing the lead vehicle is detected. The limit control reduces a proportion of the driving force increased by the increase in the speed ratio of the automatic transmission to the driving force increased by the increase in the output from the driving source.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and further objects, features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings, wherein like numerals are used to represent like elements and wherein:

FIG. 1 is a block diagram showing a powertrain of a vehicle to which a vehicle control apparatus according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing the ECU 1000 shown in FIG. 1.

FIGS. 3A and 3B are flowcharts showing a routine of the processes performed by the powertrain control unit 1300 shown in FIG. 2.

FIG. 4 is a timing diagram showing a change in a required throttle opening over time.

FIG. 5 is a graph showing the changed shift line.

FIG. 6 is a view illustrating how the vehicle travels.

FIG. 7 is a view illustrating how the vehicle travels.

Claims

1. A vehicle control apparatus that controls a vehicle equipped with a driving source and an automatic transmission connected to the driving source, and increases a driving force by at least one of an increase in output from the driving source and an increase in a speed ratio of the automatic transmission when the vehicle is traveling, the vehicle control apparatus comprising: a detecting unit that detects a request for passing a lead vehicle made by a driver; anda control unit that performs a speed ratio change limit control when the request for passing the lead vehicle is detected, the speed ratio change limit control reducing a proportion of the driving force increased by the increase in the speed ratio of the automatic transmission to the driving force increased by the increase in the output from the driving source.

2. The vehicle control apparatus according to claim 1, wherein the automatic transmission includes a gearshift transmission mechanism, and the speed ratio is increased by downshifting; andthe control unit does not perform the downshifting and increases the output from the driving source when the request for passing the lead vehicle is detected.

3. The vehicle control apparatus according to claim 2, wherein the control unit increases the output from the driving source by increasing a throttle opening from a basic throttle opening corresponding to a normal driving control.

4. The vehicle control apparatus according to claim 2, wherein the control unit moves a shift line of the speed ratio of the gearshift transmission mechanism in a direction increasing a throttle opening to prohibit the downshifting.

5. The vehicle control apparatus according to claim 1, wherein the detecting unit determines whether the vehicle is traveling in either of a driving lane or a passing lane, and detects the request for passing the lead vehicle by detecting a lane change from the driving lane to the passing lane.

6. The vehicle control apparatus according to claim 5, wherein the control unit terminates the speed ratio change limit control when the vehicle is traveling in the driving lane after a lane change from the passing lane to the driving lane.

7. The vehicle control apparatus according to claim 5, wherein the control unit terminates the speed ratio change limit control when the vehicle is continuously driving in the passing lane.

8. The vehicle control apparatus according to claim 1, further comprising: a rapid acceleration detecting unit that detects a request for rapid acceleration, wherein the control unit prohibits the speed ratio change limit control when the request for rapid acceleration is detected.

9. The vehicle control apparatus according to claim 8, wherein the rapid acceleration detecting unit detects the request for rapid acceleration according to an amount of change in the accelerator pedal operation.

10. A vehicle control apparatus that controls a vehicle having a driving source and an automatic transmission connected to the driving source, the vehicle control apparatus comprising: a driving source control unit that increases a driving force by an increase in output from the driving source;a speed ratio control unit that increases the driving force by an increase in a speed ratio;a detecting unit that detects a lane change of the vehicle from a driving lane to a passing lane; anda control unit that performs a speed ratio change limit control when the lane change from the driving lane to the passing lane is detected, the speed ratio change limit control reducing a proportion of the driving force increased by the increase in the speed ratio of the automatic transmission to the driving force increased by the increase in the output from the driving source.

11. The vehicle control apparatus according to claim 10, wherein the automatic transmission includes a gearshift transmission mechanism, and the speed ratio is increased by downshifting; andthe control unit does not perform the downshifting and increases the output from the driving source when the lane change from the driving lane to the passing lane is detected.

12. The vehicle control apparatus according to claim 10, wherein the detecting unit detects the lane change from the driving lane to the passing lane according to a current position of the vehicle and map information.

13. A vehicle control method that controls a vehicle having a driving source and an automatic transmission connected to the driving source, and increases a driving force by at least one of an increase in output from the driving source and an increase in a speed ratio of the automatic transmission when the vehicle is traveling, the vehicle control method comprising: detecting a request for passing a lead vehicle made by a driver; andperforming a speed ratio change limit control when the request for passing the lead vehicle is detected, the speed ratio change limit control reducing a proportion of the driving force increased by the increase in the speed ratio of the automatic transmission to the driving force increased by the increase in the output from the driving source.