US5265020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque distribution control apparatus for four wheel drive
Assignee: Mazda Motor Corp
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Filing: 1991-04-18
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Granted: 1993-11-23
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Expires: 2011-04-18
Abstract
Abstract The torque distribution for four wheels is controlled correspondingly to the turning state of a car. In this case, a target yaw rate is determined on the basis of a steering angle and a car speed so that the torque distribution ratio of right and left wheels is set. Consequently, the turning of the car can be improved. In addition, a quantity of drivers' steering can be prevented from being excessively increased during turning.
Inventors
- 👤 Yasunari Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:36
CPC Classifications
B; B60; B60K; B60K23/00; B60K23/08; B60K23/0808
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
159 words
A torque distribution control apparatus of a four wheel drive in which four wheels of a car are driven by engine outputs, comprising; torque distribution change means for adjusting a quantity of the engine outputs to be transmitted to the four wheels so as to change driving torque distribution between right and left wheels, a steering angle sensor for detecting a steering angle, a car speed sensor for detecting a car speed, a yaw rate sensor for detecting an actual yaw rate of the car, and torque distribution control means having a yaw rate setting section for setting a target yaw rate on the basis of the steering angle and car speed, and a lateral distribution ratio setting section for setting the torque distribution ratio between the right and left wheels such that the actual yaw rate corresponds to the target yaw rate and controlling the torque distribution change means on the basis of the distribution ratio thus set.
Claim 2
Dependent Claim
159 words
A torque distribution control apparatus of a four wheel drive in which four wheels of a car are driven by engine outputs, comprising; torque distribution change means for adjusting a quantity of the engine outputs to be transmitted to the four wheels so as to change driving torque distribution between right and left wheels, a steering angle sensor for detecting a steering angle, a car speed sensor for detecting a car speed, a yaw rate sensor for detecting an actual yaw rate of the car, and torque distribution control means having a yaw rate setting section for setting a target yaw rate on the basis of the steering angle and car speed, and a lateral distribution ratio setting section for setting the torque distribution ratio between the right and left wheels such that the actual yaw rate corresponds to the target yaw rate and controlling the torque distribution change means on the basis of the distribution ratio thus set.
Claim 3
Dependent Claim
43 words
A torque distribution control apparatus of a four wheel drive according to claim 1, wherein the target yaw rate is caused on the car correspondingly to the steering angle and car speed when a friction coefficient is great between a road and tires.
Claim 4
Dependent Claim
72 words
A torque distribution control apparatus of a four wheel drive according to claim 2, wherein the torque distribution control means includes a running state decision section for deciding the turning start or turning escape of the car on the basis of the steering angle, and the yaw rate setting section sets the target yaw rate to be increased at the time of turning start and decreased at the time of turning escape.
Claim 5
Dependent Claim
55 words
A torque distribution control apparatus of a four drive wheel according to claim 3, wherein the torque distribution control means includes a lateral distribution ratio correction section which restricts and corrects the torque distribution ratio between the right and left wheels on the basis of the load movement rate between the right and left wheels.
Claim 6
Dependent Claim
39 words
A torque distribution control apparatus of a four drive wheel according to claim 4, wherein the torque distribution ratio between the right and left wheels are not restricted and corrected at the time of turning start of the car.
Claim 7
Dependent Claim
87 words
A torque distribution control apparatus of a four drive wheel according to claim 5, wherein the torque distribution control means includes a longitudinal distribution ratio setting section for setting the torque distribution ratio for the front and rear wheels correspondingly to the operating conditions of the car, and a longitudinal distribution ratio correction section for correcting the torque distribution ratio between the front and rear wheels such that the torque distribution for the rear wheels is decreased when the actual yaw rate exceeds the target yaw rate.
Claim 8
Dependent Claim
39 words
A torque distribution control apparatus of a four drive wheel according to claim 3, wherein the torque distribution ratio between the right and left wheels are not restricted and corrected at the time of turning start of the car.
Claim 9
Dependent Claim
87 words
A torque distribution control apparatus of a four drive wheel according to claim 7, wherein the torque distribution control means includes a longitudinal distribution ratio setting section for setting the torque distribution ratio for the front and rear wheels correspondingly to the operating conditions of the car, and a longitudinal distribution ratio correction section for correcting the torque distribution ratio between the front and rear wheels such that the torque distribution for the rear wheels is decreased when the actual yaw rate exceeds the target yaw rate.
Claim 10
Dependent Claim
72 words
A torque distribution control apparatus of a four wheel drive according to claim 1, wherein the torque distribution control means includes a running state decision section for deciding the turning start or turning escape of the car on the basis of the steering angle, and the yaw rate setting section sets the target yaw rate to be increased at the time of turning start and decreased at the time of turning escape.
Claim 11
Dependent Claim
55 words
A torque distribution control apparatus of a four drive wheel according to claim 9, wherein the torque distribution control means includes a lateral distribution ratio correction section which restricts and corrects the torque distribution ratio between the right and left wheels on the basis of the load movement rate between the right and left wheels.
Claim 12
Dependent Claim
39 words
A torque distribution control apparatus of a four drive wheel according to claim 10, wherein the torque distribution ratio between the right and left wheels are not restricted and corrected at the time of turning start of the car.
Claim 13
Dependent Claim
87 words
A torque distribution control apparatus of a four drive wheel according to claim 11, wherein the torque distribution control means includes a longitudinal distribution ratio setting section for setting the torque distribution ratio for the front and rear wheels correspondingly to the operating conditions of the car, and a longitudinal distribution ratio correction section for correcting the torque distribution ratio between the front and rear wheels such that the torque distribution for the rear wheels is decreased when the actual yaw rate exceeds the target yaw rate.
Claim 14
Dependent Claim
55 words
A torque distribution control apparatus of a four drive wheel according to claim 1, wherein the torque distribution control means includes a lateral distribution ratio correction section which restricts and corrects the torque distribution ratio between the right and left wheels on the basis of the load movement rate between the right and left wheels.
Claim 15
Dependent Claim
87 words
A torque distribution control apparatus of a four drive wheel according to claim 1, wherein the torque distribution control means includes a longitudinal distribution ratio setting section for setting the torque distribution ratio for the front and rear wheels correspondingly to the operating conditions of the car, and a longitudinal distribution ratio correction section for correcting the torque distribution ratio between the front and rear wheels such that the torque distribution for the rear wheels is decreased when the actual yaw rate exceeds the target yaw rate.
Claim 16
Dependent Claim
49 words
A torque distribution control apparatus of a four wheel drive according to claim 1, wherein each wheel of the car is braked by a respective brake and said torque distribution change means adjusts each respective brake so as to change driving torque distribution between the right and left wheels.
Claim 17
Dependent Claim
141 words
A torque distribution control apparatus comprising; torque distribution change means for adjusting a quantity of the engine outputs to be transmitted to right and left wheels so as to change driving torque distribution between said wheels, a steering angle sensor for detecting a steering angle, a car speed sensor for detecting a car speed, a yaw rate sensor for detecting an actual yaw rate of the car, and torque distribution control means having a yaw rate setting section for setting a target yaw rate on the basis of the steering angle and car speed, and a lateral distribution ratio setting section for setting the torque distribution ratio between the right and left wheels such that the actual yaw rate corresponds to the target yaw rate and controlling the torque distribution change means on the basis of the distribution ratio thus set.
Claim 18
Dependent Claim
141 words
A torque distribution control apparatus comprising; torque distribution change means for adjusting a quantity of the engine outputs to be transmitted to right and left wheels so as to change driving torque distribution between said wheels, a steering angle sensor for detecting a steering angle, a car speed sensor for detecting a car speed, a yaw rate sensor for detecting an actual yaw rate of the car, and torque distribution control means having a yaw rate setting section for setting a target yaw rate on the basis of the steering angle and car speed, and a lateral distribution ratio setting section for setting the torque distribution ratio between the right and left wheels such that the actual yaw rate corresponds to the target yaw rate and controlling the torque distribution change means on the basis of the distribution ratio thus set.
Claim 19
Dependent Claim
150 words
A torque distribution control apparatus of a four wheel drive in which each wheel of a car is braked by a respective brake comprising; torque distribution change means for adjusting each respective brake so as to change driving torque distribution between right and left wheels, a steering angle sensor for detecting a steering angle, a car speed sensor for detecting a car speed, a yaw rate sensor for detecting an actual yaw rate of the car, and torque distribution control means having a yaw rate setting section for setting a target yaw rate on the basis of the steering angle and car speed, and a lateral distribution ratio setting section for setting the torque distribution ratio between the right and left wheels such that the actual yaw rate corresponds to the target yaw rate and controlling the torque distribution change means on the basis of the distribution ratio thus set.
Claim 20
Dependent Claim
150 words
A torque distribution control apparatus of a four wheel drive in which each wheel of a car is braked by a respective brake comprising; torque distribution change means for adjusting each respective brake so as to change driving torque distribution between right and left wheels, a steering angle sensor for detecting a steering angle, a car speed sensor for detecting a car speed, a yaw rate sensor for detecting an actual yaw rate of the car, and torque distribution control means having a yaw rate setting section for setting a target yaw rate on the basis of the steering angle and car speed, and a lateral distribution ratio setting section for setting the torque distribution ratio between the right and left wheels such that the actual yaw rate corresponds to the target yaw rate and controlling the torque distribution change means on the basis of the distribution ratio thus set.
References Cited (Backward Citations)
US4949265A
Cited
JPH01247223A
Cited
US5046008A
Cited
US5088043A
Cited
US5060747A
Cited
US5099944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |