Angular velocity calculating device, offset determination method for the same, and vehicle stopping detecting device
First Claim
1. An angular velocity calculating device operative to determine an offset value based on an angular velocity signal that is output from a gyro while a vehicle is stationary and to determine an angular velocity while the vehicle is moving based on the offset value, the angular velocity calculating device comprising:
- a stationary range determiner configured to detect a minimum value and a maximum value of an angular velocity signal for a predetermined period T1 while a vehicle is stationary and to determine a range of the angular velocity signal used to identify when the vehicle is stationary;
a stopping/starting determiner configured to determine that the vehicle starts to move when the angular velocity signal from a gyro exceeds the range and to determine that the vehicle is stationary when the angular velocity signal from the gyro is within the range;
an angular velocity averager configured to calculate an average angular velocity value based on the angular velocity signal output from the gyro at predetermined time intervals;
an angular velocity storage configured to store the average angular velocity output from the angular velocity averager; and
an offset value determiner configured to determine an offset value based on the angular velocity stored at a set time before the stopping/starting determiner detects that the vehicle starts to move.
1 Assignment
0 Petitions
Accused Products
Abstract
Minimum and maximum values of an angular velocity signal output from a gyro while a vehicle is stationary are detected. A range of the angular velocity signal is set that is used to determine when the vehicle is stationary. When the angular velocity signal output from the gyro exceeds the range, the vehicle starts to move, offset values calculated within a set time from a movement start detection time are discarded, and an average angular velocity signal having been calculated and stored the set time before, is output as the offset value. Thus, even when the vehicle does not have a vehicle speed sensor, the stopping and starting of the movement of the vehicle can be accurately detected using the output signal from the gyro and the accurate offset value can be output.
-
Citations
13 Claims
-
1. An angular velocity calculating device operative to determine an offset value based on an angular velocity signal that is output from a gyro while a vehicle is stationary and to determine an angular velocity while the vehicle is moving based on the offset value, the angular velocity calculating device comprising:
-
a stationary range determiner configured to detect a minimum value and a maximum value of an angular velocity signal for a predetermined period T1 while a vehicle is stationary and to determine a range of the angular velocity signal used to identify when the vehicle is stationary; a stopping/starting determiner configured to determine that the vehicle starts to move when the angular velocity signal from a gyro exceeds the range and to determine that the vehicle is stationary when the angular velocity signal from the gyro is within the range; an angular velocity averager configured to calculate an average angular velocity value based on the angular velocity signal output from the gyro at predetermined time intervals; an angular velocity storage configured to store the average angular velocity output from the angular velocity averager; and an offset value determiner configured to determine an offset value based on the angular velocity stored at a set time before the stopping/starting determiner detects that the vehicle starts to move. - View Dependent Claims (2, 3, 4)
-
-
5. A vehicle stopping detecting device for detecting when a vehicle stops, comprising:
-
a gyro configured to output an angular velocity signal of the vehicle; a stationary range determiner configured to detect a minimum value and a maximum value of the angular velocity signal for a predetermined period T1 while the vehicle is stationary and to determine a range of the angular velocity signal used to determine whether the vehicle is stationary; and a stopping/starting determiner configured to determine that the vehicle starts to move when the angular velocity signal from the gyro exceeds the stationary range and to determine that the vehicle is stationary when the angular velocity signal from the gyro is within the range. - View Dependent Claims (6, 7, 8)
-
-
9. An offset determination method comprising the steps of:
-
detecting, with a stationary range determiner, a minimum value and a maximum value of an angular velocity signal for a predetermined period T1 while a vehicle is stationary and determining a range of the angular velocity signal used to determine when the vehicle is stationary; determining, with a stopping/starting determiner, that the vehicle starts to move when the angular velocity signal from a gyro exceeds the range and determining that the vehicle is stationary when the angular velocity signal from the gyro is within the range; and determining, with an offset determiner, an offset value based on the value of the angular velocity of the gyro at predetermined time intervals. - View Dependent Claims (10, 11, 12)
-
-
13. An angular velocity calculating device comprising:
-
a stationary range determiner configured to detect a minimum value and a maximum value of an angular velocity signal for a predetermined period T1 while a vehicle is stationary and to determine a range of the angular velocity signal used to identify when the vehicle is stationary; a stopping/starting determiner configured to determine that the vehicle starts to move when the angular velocity signal exceeds the range and to determine that the vehicle is stationary when the angular velocity signal is within the range; and an offset value determiner configured to determine an offset value based on the angular velocity signal at predetermined time intervals.
-
Specification