Vehicle state estimation method and vehicular auxiliary brake control apparatus using the method
First Claim
Patent Images
1. A vehicle state estimation method comprising the step of estimating a vehicle weight based on driving torque and vehicle acceleration during a gear shift in a vehicle andestimating a road surface gradient based on the vehicle weight.
1 Assignment
0 Petitions
Accused Products
Abstract
A vehicle weight and a road surface gradient are estimated based on driving torque values and vehicle acceleration values when specific behavior occurs in a vehicle. Resulting estimation values are used for vehicle controls such as an engine control, an auxiliary brake control, and a transmission control.
-
Citations
7 Claims
-
1. A vehicle state estimation method comprising the step of estimating a vehicle weight based on driving torque and vehicle acceleration during a gear shift in a vehicle and
estimating a road surface gradient based on the vehicle weight.
-
4. A vehicular auxiliary brake control apparatus comprising:
-
road surface gradient detecting means for estimating a vehicle weight based on driving torque and vehicle acceleration when specific behavior occurs in a vehicle, and for detecting a road surface gradient based on the estimated vehicle weight;
brake state detecting means for detecting an operation state of the brake;
vehicle speed detecting means for detecting a speed of the vehicle; and
an auxiliary brake device for employing, as a target vehicle speed, a vehicle speed at a time point when the road surface gradient detecting means has detected a downhill slope and the brake state detecting means has detected a change from a brake operating state to a brake non-operating state during running on the downhill slope, and for decelerating the vehicle so that an actual vehicle speed becomes the target vehicle speed. - View Dependent Claims (5)
-
-
6. A vehicular auxiliary brake control method using:
-
road surface gradient detecting means for estimating a vehicle weight based on driving torque and vehicle acceleration when specific behavior occurs in a vehicle, and for detecting a road surface gradient based on the estimated vehicle weight;
brake state detecting means for detecting an operation state of a brake; and
vehicle speed detecting means for detecting a speed of the vehicle, the method comprising the steps of;
employing, as a target vehicle speed, a vehicle speed at a time point when the road surface gradient detecting means has detected a downhill slope and the brake state detecting means has detected a change from a brake operating state to a brake non-operating state during running on the downhill slope; and
performing an auxiliary brake control by operating an auxiliary brake device for decelerating the vehicle so that an actual vehicle speed becomes the target vehicle speed. - View Dependent Claims (7)
-
Specification