Deceleration factor estimating device and drive assisting device

Patent metadata

Field	Value
Publication number	US-9205843-B2
Application number	US-201214376288-A
Country	US
Kind code	B2
Filing date	Feb 3, 2012
Priority date	Feb 3, 2012
Publication date	Dec 8, 2015
Grant date	Dec 8, 2015

Abstract

A deceleration factor estimating device that estimates a deceleration factor of a vehicle includes a road load calculating unit configured to calculate a road load estimated value, and a filtering calculating unit configured to perform filtering processing of extracting a predetermined frequency component of the road load estimated value calculated by the road load calculating unit. The filtering calculating unit extracts a vehicle-originated road load component, an environment-originated road load component, and the like by filtering the road load estimated value to extract a certain predetermined frequency component.

First claim

The invention claimed is:

1. A drive assisting device comprising:
a deceleration factor estimating device that estimates a deceleration factor of a vehicle, the deceleration factor estimating device including
a road load calculating unit configured to calculate a road load estimated value, and
a filtering calculating unit configured to perform filtering processing of extracting a predetermined frequency component of the road load estimated value, wherein
the filtering calculating unit extracts a total road load component by performing filtering processing on the road load estimated value with a first time constant,
the filtering calculating unit extracts a vehicle-originated road load component by performing filtering processing on the road load estimated value with a second time constant that has a period longer than that of the first time constant, and
the filtering calculating unit calculates an environment-originated road load component by subtracting the vehicle-originated road load component from the total road load component,
the vehicle-originated road load component includes resistance generated in a drive system that transmits a driving force generated by a driving source,
the environment-originated road load component includes road surface resistance generated between a tire and a road surface; and

a drive assisting control unit configured to execute drive assistance using a deceleration factor estimated by the deceleration factor estimating device, wherein
each of the road load calculating unit, the filtering calculating unit, and the drive assisting control unit is comprised in at least one electronic control unit (ECU).

2. The drive assisting device according to claim 1 , wherein
the drive assisting control unit stops the drive assistance at the time the environment-originated road load component is a threshold value or more.

3. The drive assisting device according to claim 1 , wherein
the drive assisting control unit stops the drive assistance at the time an amount of change of the environment-originated road load component is a threshold value or more.

4. The drive assisting device according to claim 1 , further comprising:
a vehicle behavior stability control detecting unit configured to detect an operation of vehicle behavior stability control, wherein
the drive assisting control unit stops the drive assistance at the time the operation of the vehicle behavior stability control is detected by the vehicle behavior stability control detecting unit, and
the vehicle behavior stability control detecting unit is comprised in the at least one electronic control unit (ECU).

5. A drive assisting device comprising:
a deceleration factor estimating device that estimates a deceleration factor of a vehicle, the deceleration factor estimating device including
a road load calculating unit configured to calculate a road load estimated value,
a filtering calculating unit configured to perform filtering processing of extracting a predetermined frequency component of the road load estimated value,
a deceleration factor estimating unit configured to include the road load calculating unit and the filtering calculating unit,
a driving force acquiring unit configured to acquire a driving force of the vehicle,
a vehicle speed acquiring unit configured to acquire a vehicle speed of the vehicle, and
an acceleration acquiring unit configured to acquire an acceleration of the vehicle, wherein
the filtering calculating unit extracts a total road load component by performing filtering processing on the road load estimated value with a first time constant,
the filtering calculating unit extracts a vehicle-originated road load component by performing filtering processing on the road load estimated value with a second time constant that has a period longer than that of the first time constant, and
the filtering calculating unit calculates an environment-originated road load component by subtracting the vehicle-originated road load component from the total road load component,
the vehicle-originated road load component includes resistance generated in a drive system that transmits a driving force generated by a driving source,
the environment-originated road load component includes road surface resistance generated between a tire and a road surface, and
the deceleration factor estimating unit estimates a plurality of deceleration factors including the road load estimated value based on a relation among the acquired driving force, the vehicle speed acquired by the vehicle speed acquiring unit, and the acceleration acquired by the acceleration acquiring unit; and

a drive assisting control unit configured to execute drive assistance using a deceleration factor estimated by the deceleration factor estimating device, wherein
each of the road load calculating unit, the filtering calculating unit, the deceleration factor estimating unit, the driving force acquiring unit, the vehicle speed acquiring unit, the acceleration acquiring unit, and the drive assisting control unit is comprised in at least one electronic control unit (ECU).

6. The drive assisting device according to claim 5 , wherein
the deceleration factor estimating unit determines one deceleration factor to be estimated based on the vehicle speed acquired by the vehicle speed acquiring unit and the acceleration acquired by the acceleration acquiring unit.

7. The drive assisting device according to claim 5 , wherein
the deceleration factor estimating unit analyzes a relation among the driving force, the vehicle speed acquired by the vehicle speed acquiring unit, and the acceleration acquired by the acceleration acquiring unit by using an equation of motion, and estimates the deceleration factor.

8. A drive assisting device comprising:
a deceleration factor estimating device that estimates a deceleration factor of a vehicle, the deceleration factor estimating device including
a road load calculating unit configured to calculate a road load estimated value,
a filtering calculating unit configured to perform filtering processing of extracting a predetermined frequency component of the road load estimated value,
a deceleration factor estimating unit configured to include the road load calculating unit and the filtering calculating unit,
a driving force acquiring unit configured to acquire a driving force of the vehicle,
a vehicle speed acquiring unit configured to acquire a vehicle speed of the vehicle, and
an acceleration acquiring unit configured to acquire an acceleration of the vehicle, wherein
the filtering calculating unit extracts a total road load component by performing filtering processing on the road load estimated value with a first time constant,
the filtering calculating unit extracts a vehicle-originated road load component by performing filtering processing on the road load estimated value with a second time constant that has a period longer than that of the first time constant, and
the filtering calculating unit calculates an environment-originated road load component by subtracting the vehicle-originated road load component from the total road load component,
the vehicle-originated road load component includes resistance generated in a drive system that transmits a driving force generated by a driving source,
the environment-originated road load component includes road surface resistance generated between a tire and a road surface,
the deceleration factor estimating unit estimates a plurality of deceleration factors including the road load estimated value based on a relation among the acquired driving force, the vehicle speed acquired by the vehicle speed acquiring unit, and the acceleration acquired by the acceleration acquiring unit,
the dece

Assignees

• Sannodo Shinya
• Otake Hirotada
• Toyota Motor Co Ltd

Inventors

• Sannodo Shinya
• Otake Hirotada

Classifications

• B60W40/1005

  Driving resistance · CPC title

• B60W50/14

  Means for informing the driver, warning the driver or prompting a driver intervention · CPC title

• B60W2510/244

  Charge state · CPC title

• B60W2530/10

  Weight · CPC title

• B60W20/10

  Controlling the power contribution of each of the prime movers to meet required power demand · CPC title