Systems and Methods for Controlling Manual Transmissions

• US 20110040461A1
• Filed: 08/14/2009
• Published: 02/17/2011
• Est. Priority Date: 08/14/2009
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Wolterman, Michael John
• Granted Patent: US 8,843,284 B2
• Time in Patent Office: Days
• US Class Current: 701/51
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2540/14 Clutch pedal position
• CPC Class Codes: B60W 2540/16 Ratio selector position
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: B60W 50/0097 Predicting future conditions
• CPC Class Codes: F16H 2059/086 Adaptive mode, e.g. learning from the driver
• CPC Class Codes: F16H 2061/0225 Modifying of shift maps by manual control, e.g. by learning values from the driver during manual shift mode
• CPC Class Codes: F16H 59/0217 with electric switches or sensors not for gear or range selection, e.g. for controlling auxiliary devices for gear selection F16H59/044; for range selection F16H59/105
• CPC Class Codes: F16H 61/28 with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted

Abstract

A method for controlling a manual transmission of a vehicle includes providing a manual transmission comprising a shift fork actuator and a shifter assembly comprising a shift lever, a shift knob disposed on the shifter lever, a shift lever position sensor and a shifter tactile sensor. The tactile sensor may be used to determine when pressure is applied to the shift knob of the shifter assembly and, when pressure is applied to the shift knob, vehicle operating parameters are monitored. A predicted gear selection is determined based on the monitored vehicle operating parameters. An operator gear selection is then determined based on the shift lever position sensor when the shift lever is moved. The operator gear selection is compared to the predicted gear selection and, when the predicted gear selection is the same as the operator gear selection, the manual transmission is shifted to the predicted gear selection.

Claims

1. A method for controlling a manual transmission of a vehicle, the method comprising:

providing a manual transmission comprising a shift fork actuator and a shifter assembly comprising a shift lever, a shift knob disposed on the shift lever, a shift lever position sensor and a shifter tactile sensor;

determining when pressure is applied to the shift knob of the shifter assembly with the shifter tactile sensor;

monitoring vehicle operating parameters when pressure is applied to the shift knob;

determining a predicted gear selection based on the monitored vehicle operating parameters;

determining an operator gear selection using the shift lever position sensor when the shift lever is moved;

comparing the predicted gear selection to the operator gear selection; and

shifting the manual transmission to the predicted gear selection with the shift fork actuator when the predicted gear selection is the same as the operator gear selection.

2. The method of claim 1 further comprising shifting the manual transmission to the operator gear selection with the shift fork actuator when the predicted gear selection is not the same as the operator gear selection.

3. The method of claim 1 further comprising:

providing a clutch pedal with a pedal portion;

determining when pressure is applied to the pedal portion of the clutch pedal without the clutch pedal being depressed simultaneous with determining if pressure is applied to the shift knob of the shifter assembly.

4. The method of claim 3 wherein the vehicle operating parameters are monitored when pressure is applied to either the shift knob, the pedal portion of the clutch pedal, or both.

5. The method of claim 1 further comprising:

providing a clutch pedal with a clutch pedal position sensor; and

determining if the clutch pedal is depressed using the clutch pedal position sensor.

6. The method of claim 5 wherein the operator gear selection is determined when the shift lever is moved and the clutch pedal is depressed.

7. The method of claim 1 wherein the predicted gear selection is determined by comparing a presently selected gear and the monitored vehicle operating parameters to a look-up table comprising vehicle operating parameters and previous gear selections indexed according to the presently selected gear.

8. A system for electronically shifting a manual transmission of a vehicle, the system comprising a shifter assembly, a shift fork actuator, a clutch actuator, and a controller, wherein:

the shifter assembly comprises a shift lever comprising a shift knob, a shift gate, a shifter tactile sensor, and a shift lever position sensor, wherein;

the shifter tactile sensor is operable to detect a pressure applied to the shift knob and send a tactile signal to the controller indicative of the pressure being applied to the shift knob; and

the shift lever position sensor is operable to detect a position of the shift lever in the shift gate and send a gear selection signal to the controller indicative of the selected gear ratio;

the controller is operable to;

determine a shift command signal based on the received gear selection signal when the received tactile signal indicates pressure is applied to the shift knob;

send a clutch command signal to the clutch actuator; and

send the shift command signal to the shift actuator when the gear selection signal indicates that the shift lever has moved;

the clutch actuator is operable to receive the clutch command signal from the controller and, based on the received clutch command actuate the clutch; and

the shift fork actuator is operable to receive the shift command signal from the controller and shift the manual transmission to the gear ratio represented by the shift command signal.

9. The system of claim 8 further comprising a clutch pedal comprising a clutch pedal pressure sensor and a clutch pedal position sensor, wherein:

the clutch pedal pressure sensor is operable to detect a pressure applied to the clutch pedal and send a clutch pedal pressure signal to the controller indicative of pressure being applied to the clutch pedal, wherein the shift command signal is determined by the controller when the received tactile signal indicates pressure is applied to the shift knob, when the received clutch pedal pressure signal indicates pressure is applied to the clutch pedal, or both;

the clutch pedal position sensor is operable to detect a position of the clutch pedal and send a clutch pedal position signal to the controller indicative of the position of the clutch pedal; and

the clutch command signal is determined by the controller based on the received clutch pedal position signal.

10. The system of claim 8 wherein the controller is further operable to:

receive at least one vehicle operation input signal;

determine a predicted gear selection based on the received vehicle operation input signal; and

compare the predicted gear selection to a gear selected by the operator and, when the predicted gear selection is the same as the gear selected by the operator, send the shift command signal to the shift actuator to shift the manual transmission to the predicted gear selection.

11. The system of claim 10 wherein the controller is further operable to send a shift command signal to the shift fork actuator to shift the manual transmission to the gear selected by the operator when the predicted gear selection is not the same as the gear selected by the operator.

12. The system of claim 10 wherein the predicted gear selection is determined by comparing a presently selected gear and the vehicle operation input signals to an LUT of prior vehicle operation input signals indexed according to the presently selected gear.

13. The system of claim 10 further comprising storing the predicted gear selection and the vehicle operation input signals in a look-up table indexed according to the presently selected gear.

14. The system of claim 10 wherein the vehicle operation input signal comprises a speed at which the shift lever is moved, a rotational speed signal indicative of the rotational speed of an engine of the vehicle, an engine load signal indicative of the load on the engine, a vehicle speed signal indicative of a speed of the vehicle, a brake pedal position signal indicative of a position of a brake pedal, a throttle position signal indicative of a position of a throttle, a steering wheel position signal or combinations thereof.

15. The system of claim 8 wherein the controller is further operable to place the transmission in a predetermined gear ratio when the vehicle is parked and the operator does not select a gear ratio.

16. A method for controlling a manual transmission of a vehicle, the method comprising:

providing a manual transmission comprising a shift fork actuator and a clutch actuator and a controller operable to actuate the shift fork actuator and the clutch actuator and receive at least one vehicle operation input signal;

learning a driving style of an operator of the vehicle by storing a plurality of shift histories in a memory associated with the controller, the shift histories comprising the value of the at least one vehicle operation input signal for a shift;

determining a predicted gear selection based on at least one current vehicle operation input signal, a presently selected gear ratio and the stored shift histories; and

actuating the shift fork actuator and the clutch actuator to shift the manual transmission to the predicted gear selection.

17. The method of claim 16 further comprising:

determining an operator gear selection;

comparing the operator gear selection with the predicted gear selection; and

actuating the shift fork actuator and the clutch actuator to shift the manual transmission to the predicted gear selection when the predicted gear selection is the same as the operator gear selection.

18. The method of claim 16 further comprising:

providing a shifter assembly comprising a shift lever and shift knob with a shifter tactile sensor, wherein the shifter tactile sensor is operatively coupled to the controller and the predicted gear selection is determined when pressure is applied to the shift knob as determined with the shifter tactile sensor.

19. The method of claim 18 further comprising:

providing a clutch pedal comprising a pedal portion with a clutch pedal pressure sensor, wherein the clutch pedal pressure sensor is operatively coupled to the controller and the predicted gear selection is determined when pressure is applied to the pedal portion as determined by the clutch pedal pressure sensor, when pressure is applied to the shift knob, or both.

20. The method of claim 19 further comprising actuating the shift fork actuator and the clutch actuator to shift the manual transmission to the operator gear selection when the predicted gear selection is not the same as an operator gear selection.