Vehicle braking-force control device
First Claim
1. A vehicle braking-force control device comprising:
- a road-surface friction coefficient estimator configured to estimate a road-surface friction coefficient;
a ground-load estimator configured to estimate ground loads acting on individual wheels;
a lateral-tire-force estimator configured to estimate lateral tire forces acting on the individual wheels;
a vehicle-behavior detector configured to detect whether a vehicle is running in an understeer condition or an oversteer condition;
a permissible-engine-torque calculator configured to calculate a permissible engine torque on the basis of the road-surface friction coefficient, the ground loads of the individual wheels, and the lateral tire forces of the individual wheels when an understeer condition is detected;
a brake controller configured to perform brake control on an inside turning wheel when the understeer condition is detected; and
an engine-torque controller configured to control an engine torque such that;
in an understeer condition detected when the brake controller performs a brake control, and when an operation of engine braking is not detected, the engine-torque controller reduces the engine torque in accord with a parameter that is based on the permissible engine torque, andin an understeer condition detected when the brake controller performs a brake control, and when an operation of engine braking is detected, the engine-torque controller increases the engine torque to substantially zero.
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Accused Products
Abstract
A braking-force control device has a brake control function for performing brake control on a front outside wheel when a vehicle is detected to be in an oversteer condition during a turning operation and for performing brake control on a rear inside wheel when the vehicle is detected to be in an understeer condition during a turning operation. For preventing the oversteer condition, a command for reducing the engine torque is output. On the other hand, for preventing the understeer condition, the engine torque is limited in accordance with a permissible engine torque value that is calculated on the basis of a road-surface friction coefficient, and ground loads and lateral tire forces of individual wheels. If it is detected that engine braking is in operation, the engine torque is adjusted to substantially zero.
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Citations
19 Claims
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1. A vehicle braking-force control device comprising:
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a road-surface friction coefficient estimator configured to estimate a road-surface friction coefficient; a ground-load estimator configured to estimate ground loads acting on individual wheels; a lateral-tire-force estimator configured to estimate lateral tire forces acting on the individual wheels; a vehicle-behavior detector configured to detect whether a vehicle is running in an understeer condition or an oversteer condition; a permissible-engine-torque calculator configured to calculate a permissible engine torque on the basis of the road-surface friction coefficient, the ground loads of the individual wheels, and the lateral tire forces of the individual wheels when an understeer condition is detected; a brake controller configured to perform brake control on an inside turning wheel when the understeer condition is detected; and an engine-torque controller configured to control an engine torque such that; in an understeer condition detected when the brake controller performs a brake control, and when an operation of engine braking is not detected, the engine-torque controller reduces the engine torque in accord with a parameter that is based on the permissible engine torque, and in an understeer condition detected when the brake controller performs a brake control, and when an operation of engine braking is detected, the engine-torque controller increases the engine torque to substantially zero. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle braking-force control device comprising:
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a road-surface friction coefficient estimator configured to estimate a road-surface friction coefficient; a ground-load estimator configured to estimate ground loads acting on individual wheels; a lateral-tire-force estimator configured to estimate lateral tire forces acting on the individual wheels; a permissible-engine-torque calculator configured to calculate a permissible engine torque on the basis of the road-surface friction coefficient, the ground loads of the individual wheels, and the lateral tire forces of the individual wheels; a vehicle-behavior detector configured to detect whether a vehicle is running in an oversteer condition or an understeer condition; a brake controller configured to perform brake control on an outside turning wheel when the oversteer condition is detected, and to perform brake control on an inside turning wheel when the understeer condition is detected; and an engine-torque controller configured to control an engine torque such that; if an oversteer condition is detected, when the brake controller performs a brake control, and an operation of engine braking is not detected, the engine-torque controller sets the engine torque to a pre-set engine torque value, if an understeer condition is detected, when the brake controller performs a brake control, and a current-engine torque is higher than the calculated permissible engine torque, the engine-torque controller reduces the engine torque to the calculated permissible engine torque, if an understeer condition is detected, when the brake controller performs a brake control, and a current-engine torque is less than or equal to the calculated permissible engine torque, and an operation of engine braking is not detected, the engine-torque controller will not perform an engine torque control, and if an operation of engine braking is detected, when the brake controller performs a brake control, the engine-torque controller increases the engine torque to substantially zero. - View Dependent Claims (8, 9, 10, 11)
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12. A vehicle braking-force control device comprising:
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a road-surface friction coefficient estimator configured to estimate a road-surface friction coefficient; a ground-load estimator configured to estimate ground loads acting on individual wheels; a lateral-tire-force estimator configured to estimate lateral tire forces acting on the individual wheels; a permissible-engine-torque calculator configured to calculate a permissible engine torque on the basis of the road-surface friction coefficient, the ground loads of the individual wheels, and the lateral tire forces of the individual wheels; a vehicle-behavior detector configured to detect a running condition of the vehicle; a brake controller configured to perform brake control selectively on one or more wheels of the vehicle, based on the detected running condition of the vehicle, during a turning operation of the vehicle; and an engine-torque controller configured to perform an engine torque control based on the detected running condition of the vehicle, and, selectively, based on the calculated permissible engine-torque wherein the selective performance of an engine torque control based on the calculated permissible engine-torque is dependent on the detected running condition of the vehicle, and the calculated permissible engine torque is a forward driving engine torque to be delivered to one or more of the vehicle wheels. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification