RUNNING PATTERN CALCULATING APPARATUS AND RUNNING PATTERN CALCULATING METHOD

• US 20100262408A1
• Filed: 04/12/2010
• Published: 10/14/2010
• Est. Priority Date: 04/13/2009
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Matsunaga, Masaki, TAGUCHI, Koji
• Granted Patent: US 8,483,949 B2
• Time in Patent Office: Days
• US Class Current: 703/8
• CPC Class Codes: B60W 50/0098 Details of control systems ensuring comfort, safety or stability not otherwise provided for
• CPC Class Codes: B60W 50/085 Changing the parameters of the control units, e.g. changing limit values, working points by control input

Abstract

A running pattern calculating apparatus and running pattern calculating method that stores road information; predicts a running state when the vehicle will travel on a road, based on the stored road information; divides the road into a plurality of sections based on the predicted running state and sets an evaluation function for each road section; and calculates a running pattern of the vehicle that will travel on the road, based on the evaluation function set for each road section.

Claims

1. A running pattern calculating apparatus that calculates a running pattern in a path along which a vehicle will travel, comprising:

a road information storage portion that stores road information;

a running state predicting portion that predicts a running state when the vehicle will travel on a road, based on the road information stored in the road information storage portion;

an evaluation function setting portion that divides the road into a plurality of sections based on the running state predicted by the running state predicting portion, and sets an evaluation function for each road section; and

a running pattern calculating portion that calculates a running pattern of the vehicle that will travel on the road, based on the evaluation function set for each road section by the evaluation function setting portion.

2. The running pattern calculating apparatus according to claim 1, wherein the running pattern calculating portion calculates the running pattern with the position of the division between the sections of the road divided by the evaluation function setting portion as a variable condition.

3. The running pattern calculating apparatus according to claim 1, wherein the running state predicting portion calculates a speed pattern predicted when the vehicle will travel on the road, based on the road information stored in the road information storage portion, and the evaluation function setting portion divides the road into at least an acceleration section and a deceleration section as the road sections, based on the speed pattern calculated by the running state predicting portion, and sets an acceleration section evaluation function for the acceleration section, and a deceleration section evaluation function for the deceleration section.

4. The running pattern calculating apparatus according to claim 3, wherein the evaluation function setting portion sets the evaluation function that evaluates an engine speed of equal to or higher than medium speed as more preferable than an engine speed near zero, as the acceleration section evaluation function.

5. The running pattern calculating apparatus according to claim 3, wherein the evaluation function setting portion obtains a rate of thermal efficiency of an engine at each point when the best point for the thermal efficiency is given a numerical value of 1, sets the evaluation function in which the difference between each of all of the obtained thermal efficiency rates and 1 becomes an evaluation value as the acceleration section evaluation function, and makes the evaluation value when the engine speed is near zero a numerical value greater than 0.

6. The running pattern calculating apparatus according to claim 3, wherein the evaluation function setting portion sets the evaluation function that evaluates an engine speed near zero as more preferable than an engine speed equal to or higher than medium speed as the deceleration section evaluation function.

7. The running pattern calculating apparatus according to claim 3, wherein the evaluation function setting portion sets the evaluation function in which a numerical value at which the loss of energy input/output in a hybrid system is proportionate to acceleration/deceleration energy removed from rolling resistance deceleration is the evaluation value, when the rolling resistance is 0 as a reference, as the deceleration section evaluation function, and makes the evaluation value when the engine speed is equal to or higher than medium engine speed a numerical value greater than 0.

8. The running pattern calculating apparatus according to claim 1, wherein the running state predicting portion calculates a friction circle use rate predicted when the vehicle will travel on the road, based on the road information stored in the road information storage portion, and the evaluation function setting portion sets the evaluation function for the road section in which the friction circle use rate calculated by the running state predicting portion is relatively high different from the evaluation function for the road section in which the friction circle use rate is relatively low.

9. The running pattern calculating apparatus according to claim 8, wherein when the friction circle use rate calculated by the running state predicting portion is relatively high, the evaluation function setting portion sets the evaluation function that evaluates acceleration emphasizing thermal efficiency based on the engine operating state together with a hybrid system as preferable for the road section in which the running state is an accelerating state, and sets the evaluation function that evaluates deceleration by regeneration and power assist based on the engine being off as preferable for the road section in which the running state is a decelerating state.

10. The running pattern calculating apparatus according to claim 1, further comprising:

an assist control unit that defines a plurality of sections corresponding to the running state based on a target speed/acceleration pattern related to a target speed or a target acceleration when the vehicle is traveling, and assists to achieve a travel plan for each defined section.

11. The running pattern calculating apparatus according to claim 10, wherein the assist control unit outputs, in a visually and/or audibly recognizable manner, information related to the running state corresponding to the section and/or information related to a difference between the speed or the acceleration of the target speed/acceleration pattern and the speed or the acceleration input to the vehicle by the driver.

12. A running pattern calculating method for calculating a running pattern in a path along which a vehicle will travel, comprising:

storing road information;

predicting a running state when the vehicle will travel on a road, based on the stored road information;

dividing the road into a plurality of sections based on the predicted running state, and setting an evaluation function for each road section; and

calculating a running pattern of the vehicle that will travel on the road, based on the evaluation function set for each road section.