CLUTCH CONTROL FOR PROVIDING AN INDICATION TO A DRIVER

Abstract

An illustrative example embodiment of a system for providing an indication to a driver includes a clutch that is at least partially automatically controllable and clutch control means configured to control the clutch in a manner that results in a haptic indication to a driver based on at least one predefined condition. In an example embodiment, the clutch control includes automatically adjusting an amount of clutch engagement to provide the haptic indication.

Claims

1-17. (canceled)

18. A system for providing an indication to a driver, comprising: a clutch that is at least partially automatically controllable; and clutch control means configured to: determine a need to shift a gear of an associated transmission; and control the clutch in a manner that results in a haptic indication to the driver based on at least the determined need to shift a gear of the associated transmission.

19. The system of claim 18, wherein the clutch control means automatically adjusts an amount of engagement of the clutch to cause the haptic indication.

20. The system of claim 18, wherein the clutch control means automatically and repeatedly causes engagement of the clutch to increase and decrease.

21. The system of claim 18, wherein the clutch control means automatically causes clutch engagement to oscillate between two engagement conditions.

22. The system of claim 18, wherein the haptic indication comprises vibration of at least one component associated with the clutch.

23. The system of claim 18, wherein the haptic indication simulates an impending engine stall.

24. A vehicle comprising the system of claim 18 and comprising an engine associated with the clutch; and the transmission associated with the clutch; wherein controlling the clutch in a manner that results in a haptic indication to the driver is further based on: a speed of the engine corresponding to a vehicle stop; the driver indicating a desire to increase the speed of the engine; and the transmission being in a gear that is not suitable to start movement of the vehicle from stop.

25. The vehicle of claim 24, wherein the haptic indication is intended to prompt the driver to shift the transmission into a different gear.

26. The vehicle of claim 24, wherein the clutch is manually controllable; and the transmission is manually controllable.

27. A method of providing an indication to a driver, comprising: determining a need to shift a gear of an associated transmission; and automatically controlling an at least partially automatically controllable clutch in a manner that results in a haptic indication to the driver based on at least the determined need to shift a gear of the associated transmission.

28. The method of claim 27, comprising automatically adjusting an amount of engagement of the clutch to cause the haptic indication.

29. The method of claim 27, comprising automatically and repeatedly causing engagement of the clutch to increase and decrease.

30. The method of claim 27, comprising automatically causing clutch engagement to oscillate between two engagement conditions.

31. The method of claim 27, wherein the haptic indication comprises vibration of at least one component associated with the clutch.

32. The method of claim 27, wherein the haptic indication simulates an impending engine stall.

33. The method of claim 27, wherein controlling the clutch in a manner that results in a haptic indication to a driver is further based on an attempted start from stop of an associated vehicle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] One or more embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0026] FIG. 1 diagrammatically illustrates an example embodiment of a vehicle including a driver indicator system designed according to an embodiment of this invention;

[0027] FIG. 2 schematically illustrates selected portions of a vehicle including a driver indicator system designed according to an embodiment of this invention;

[0028] FIG. 3 is a flowchart diagram summarizing an example driver indication strategy; and

[0029] FIGS. 4A-4D illustrate an example scenario including clutch control for providing an indication to a driver according to an embodiment of this invention.

DETAILED DESCRIPTION

[0030] FIGS. 1 and 2 illustrate selected features of a vehicle 20. A clutch 22 selectively couples an engine 24 and transmission 26 for delivering torque to wheels 28 to cause desired movement of the vehicle 20. The clutch 22 in this example is at least partially automatically controllable. A clutch control means 30 is provided for controlling or modifying operation of the clutch 22 under selected circumstances. The clutch control means 30 in some examples comprises a processor or electronic controller that is suitably programmed to achieve the desired clutch control. The processor may be a dedicated or distinct device or may be a portion of a processor that performs other functions or operations. Some embodiments include several processors that contribute to clutch control, such as by communicating over a network.

[0031] The example of FIG. 2 includes a manual clutch control means 32 for allowing a driver to manually control whether the clutch 22 is released or engaged. In some examples, the manual clutch control means 32 comprises a clutch pedal that may be manipulated by a driver to control the engagement of the clutch 22.

[0032] In the illustrated example, the transmission 26 is a manual transmission. A gear selection means 34 for manually selecting a gear provides manual control to a vehicle driver. In one example, the gear selection means comprises a stick shift mechanism or a moveable handle that can be manipulated to select a gear.

[0033] A supervisory control means 36 monitors information regarding vehicle performance, a condition of the engine 24, clutch 22 and transmission 26. In this example, the supervisory control means 36 communicates with the clutch control means 30 under selected conditions to provide information to the clutch control means 30 for controlling the clutch 22 in a manner that provides an indication to a driver of the vehicle 20 regarding a condition that requires driver attention, for attention. The supervisory control means 36 in some embodiments comprises a processor suitably programmed according to the needs of a particular vehicle and system embodiment. While the clutch control means 30 and the supervisory control means 36 are illustrated separately in FIG. 2, it is possible to realize both of them using a single processor unit.

[0034] Those skilled in the art who have the benefit of this description will realize what combination of electronics, software and firmware will best meet their particular needs.

[0035] FIG. 3 is a flowchart diagram 40 summarizing an example approach for providing an indication to a driver. At 42, a determination is made that a condition exists that requires driver attention or response. The supervisory control means 36 makes this determination according to an example embodiment. At 44, the clutch control means 30 controls the clutch 22 in a manner that provides a haptic indication to a driver regarding a condition that was determined to exist at 42. At 46, a determination is made whether the condition has been resolved. If not, the clutch control at 44 continues until the condition has been resolved or a preset time limit has expired, or a different strategy is implemented. Once the condition has been resolved, the supervisory control means 36 continues monitoring whether another condition exists that may require providing an indication to a driver.

[0036] One example situation in which a haptic driver indication would be useful is when a driver has reduced the speed of the vehicle while leaving the transmission 26 in a high gear. If the driver brings the vehicle to a rest, for example, starting the vehicle from stop requires the transmission 26 to be in a suitable gear, such as first gear. If the driver has not shifted out of a higher gear utilized prior to bringing the vehicle to a stop, the vehicle may not be successfully launched.

[0037] FIGS. 4A-4D illustrate an example scenario in which controlling the clutch 22 is useful for providing a haptic indication to the driver that can prompt the driver to shift gears so that a successful start from stop launch may occur. FIG. 4A includes a plot 50 of engine speed over time. As shown at 52, the engine speed decreases as the driver slows the vehicle down. In this particular example, the vehicle is brought to a stop and the engine speed is shown at zero in FIG. 4A. FIG. 4B includes a plot 60 showing the currently engaged gear of the transmission 26. As can be appreciated by comparing FIGS. 4A and 4B, the transmission remains in sixth gear even though the driver has brought the vehicle to a stop.

[0038] Referring to FIGS. 4A and 4C, the engine speed increases at 54 as the driver indicates a desire to launch the vehicle from stop. FIG. 4C includes a plot 70 showing an engine start request initiated at 72. As can be appreciated from FIGS. 4A and 4C, the engine speed begins to increase at 54 at the engine start request 72. Given that the transmission is currently in sixth gear as shown at 62, the supervisory control means 36 determines that driver attention is required for shifting the transmission 26 into a lower gear. The supervisory control means 36 communicates with the clutch control means 30 so that the clutch control means 30 may automatically control the clutch 22 in a manner that will provide a haptic indication to the driver for prompting the driver to shift gears.

[0039] FIG. 4D includes a plot 80 showing automatic clutch position control achieved by the clutch control means 30. Given that engine speed is increasing at 54 and the transmission is currently in sixth gear as shown at 62, the clutch control means 30 automatically adjusts engagement of the clutch 22 in a manner that repeatedly alters the engagement as shown at 82. In this example, the amount of clutch engagement is varied or oscillated about a biting point shown at 84. The result of controlling the clutch in this way causes vehicle vibration or movement that simulates an impending engine stall. The driver will haptically notice the simulated stall behaviour and realize that attention is required for launching the vehicle from stop. In some situations, the driver may instinctively downshift into a lower gear. In some embodiments, a separate visual or audible indication may also be provided to the driver indicating that the gear selection means 34 should be manipulated to shift the transmission 26 into a lower gear.

[0040] As can be appreciated from FIGS. 4B and 4D, once the driver downshifts into first gear, the automated clutch control changes as shown at 86 corresponding to the gear change.

[0041] In some embodiments, the clutch control means 30 monitors driver operation of the manual clutch control means 32 for purposes of determining whether to allow the manual clutch control to override automatic clutch control based upon information that the driver is utilizing the gear selection means 34 and the manual clutch control means 32 in a manner that indicates that the driver is attempting to shift the transmission 26 into an appropriate gear for launching the vehicle from rest. In some embodiments, the automatic control over the clutch 22 continues until the driver realizes to shift the transmission into an appropriate gear and the driver is not required to utilize manual control over the clutch under such conditions. In some embodiments, the automated clutch control associated with providing a haptic indication to the driver overrides any attempt by the driver to manually control the clutch engagement condition.

[0042] While a vehicle start from stop condition is described as an example scenario in which a haptic indication can be provided to a driver, embodiments of this invention are not limited to that scenario. Those skilled in the art who have the benefit of this description will realize other conditions in which automated clutch control for providing a haptic indication to a driver will be useful. As can be appreciated from this description, embodiments of this invention allow for providing a haptic indication to a driver to alert the driver to a situation or condition that requires some action or response from the driver.