Method and system to control electronic throttle sensitivity

• US 8,600,640 B2
• Filed: 05/11/2012
• Issued: 12/03/2013
• 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:
  US13/469,353
• Publication Number:
  US 20120283924A1
• Time in Patent Office: 571 Days
• Field of Search: 701/70, 701/84, 701/30.4, 701/30.6, 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. A method for controlling an electronic throttle for a vehicle with a controller, the steps comprising:

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

storing the sampled signals from the sensor in a memory device;

calculating an average signal using the controller based on a predetermined quantity of the sampled signals;

sending the averaged signal from the controller to the motor as a motor controlling signal for modulating an operating speed of the motor; and

discarding an older signal and replacing the older signal with a more recent signal when calculating with the controller the average signal upon the number of stored sampled signals exceeding the predetermined quantity of sampled signals; and

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 can be used by the controller for adjusting throttle sensitivity.

2. The method of claim 1, wherein the selectively modifying step provides a selectable plurality of signal number values for an operator to choose with an input the predetermined number of signals.

3. The method of claim 1, 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.

4. The method of claim 1, wherein the signals are stored in the memory device having 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.