Method and system to control electronic throttle sensitivity

• US 8,204,662 B2
• Filed: 02/28/2008
• Issued: 06/19/2012
• Est. Priority Date: 02/28/2008
• Status: Active Grant

• Current Assignee: Blue Leaf IP Incorporated (CNH Industrial N.V.)
• Original Assignee: CNH Industrial America LLC (CNH Industrial N.V.)
• Inventors: Shoemaker, Joseph R.
• Primary Examiner(s): Trammell, James
• Assistant Examiner(s): Shafi, Muhammad
• Application Number:
  US12/039,110
• Publication Number:
  US 20090222183A1
• Time in Patent Office: 1,573 Days
• Field of Search: 701/70, 701/84, 701/30.4, 701/30.6, 701/30.7, 701/30.8, 701/30.9, 701/31.1, 340/855.4, 340/855.5, 340/855.7, 340/872.4
• US Class Current: 701/70
• CPC Class Codes: F02D 11/02 characterised by hand, foot, or like operator controlled initiation means
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 11/106 Detection of demand or actuation
• CPC Class Codes: F02D 2200/602 Pedal position

Abstract

An electronic throttle control system for a motorized vehicle includes a sensor providing a signal corresponding to a relative position of an accelerator pedal between an undepressed position and a fully depressed position at a first predetermined time interval. A memory device is provided for storing a plurality of provided signals. A controller is provided for averaging a predetermined number of provided signals and sending the averaged signal to the motor at a second predetermined time interval for modulating operating speed of the motor. Upon the memory device storing the predetermined number of provided signals, provided signals are discarded from the memory device on a first in, first out basis.

Claims

1. An electronic throttle control system for a motorized vehicle comprising:

a sensor providing a signal corresponding to a relative position of an accelerator pedal between an undepressed position and a fully depressed position at a first predetermined time interval;

a memory device for storing a plurality of provided signals from the sensor;

a controller configured to determine a motor control signal as a function of a predetermined quantity of provided signals stored in the memory device and to send the motor control signal to the motor at a second predetermined time interval for modulating operating speed of the motor wherein the predetermined quantity of stored signals used in the determination of the motor control signal is modifiable by an operator input such that either additional or fewer stored signals are used by the controller in determining the motor control speed for adjusting throttle sensitivity, wherein the predetermined quantity of signals from the sensor are averaged by the controller to calculate the motor control signal; and

the memory device configured upon storing the predetermined number of provided signals, to discard an older signal from the memory device and replace the older signal with a more recent signal.

2. The control system of claim 1, wherein the predetermined number of signals averaged can be increased and decreased while the vehicle is operating.

3. The control system of claim 1, wherein the operator input is configured to provide a selectable plurality of signal number values for an operator to chose the predetermined number of signals and the quality of stored signals corresponding to positions of the pedal is at least two.

4. The control system of claim 3, wherein the selectable plurality of signal number values correspond to sensitivity settings of the throttle, wherein a high sensitivity setting corresponds to a first predetermined number and a low sensitivity setting corresponding to a second predetermined number having a value higher than the first predetermined number, wherein the sensitivity of the throttle corresponds to the effect of each signal reading from the sensor on the calculated motor control signal.

5. The control system of claim 1, wherein the memory device has a plurality of storage locations, each storage location configured to store a signal representing a position of the pedal, the controller configured to store a new signal in one of the storage locations of the memory device after the passage of the first predetermined time interval, wherein as the new signal is stored in a storage location the oldest signal value at the time is deleted from the memory, the controller configured to average signals from a selected predetermined number of storage locations such that each motor control signal is determined as a function of at least two signals from the sensor and the operator input determines the predetermined number of storage locations from which the controller calculates the motor control signal using stored signals thereform.

6. The control system of claim 1, wherein the first predetermined time interval is between about 5 milliseconds to about 500 milliseconds.

7. The control system of claim 6, wherein the first predetermined time interval is between about 5 milliseconds to about 50 milliseconds.

8. The control system of claim 7, wherein the first predetermined time interval is about 10 milliseconds.

9. The control system of claim 1, wherein the second predetermined time interval is between about 10 milliseconds to about 500 milliseconds.

10. The control system of claim 9, wherein the second predetermined time interval is between about 15 milliseconds to about 100 milliseconds.

11. The control system of claim 9, wherein the second predetermined time interval is about 20 milliseconds.

12. The control system of claim 1, wherein the memory device sequentially stores the plurality of provided signals.

13. The control system of claim 1, wherein the predetermined number of signals is between about 3 and about 25.