US 8,478,483 B2Granted

Skid detection apparatus for vehicle

AssigneeHonda Motor Co., Ltd.

InventorsYuichiro Takemori, Masatoshi Noguchi, Yuzo Okubo

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Abstract

In an apparatus for detecting a skid occurred on a four-wheel drive vehicle having a prime mover and a transmission, an actual rear right/left wheel speed ratio between the rear right/left wheel speeds is calculated based on detected front and rear wheel rotational speeds, a front/rear wheel slip ratio during grip-driving is calculated by retrieving characteristics of a front/rear wheel slip ratio set with respect to a rear right/left wheel speed ratio using the calculated actual rear right/left wheel speed ratio, an actual front/rear wheel slip ratio is calculated based on the detected front wheel rotational speed and the rear wheel rotational speed, and occurrence of skid is then determined based on a difference between the calculated front/rear wheel slip ratio during grip-driving and the calculated actual front/rear wheel slip ratio.

Claims10

Dependent claims

An apparatus for detecting a skid occurred on a vehicle having a prime mover and a transmission that changes an output of the prime mover in speed and transmits the output to front right/left wheels and rear right/left wheels to drive them, comprising:

a front/rear wheel rotational speed detector that detects each rotational speed of the front wheels and that of the rear wheels;
an actual rear right/left wheel speed ratio calculator that calculates an actual rear right/left wheel speed ratio between the rear right/left wheel speeds based on the detected front wheel rotational speed and the rear wheel rotational speed;
a grip-driving front/rear wheel slip ratio calculator that calculates a front/rear wheel slip ratio during grip-driving by retrieving characteristics of a front/rear wheel slip ratio set with respect to a rear right/left wheel speed ratio using the calculated actual rear right/left wheel speed ratio, which characteristics are calculated and prepared in advance based on assumption that the front and rear wheels grip a road;
an actual front/rear wheel slip ratio calculator that calculates an actual front/rear wheel slip ratio based on the detected front wheel rotational speed and the rear wheel rotational speed;
and
a skid determiner that determines that a skid has occurred based on a difference between the calculated front/rear wheel slip ratio during grip-driving and the calculated actual front/rear wheel slip ratio,
wherein the skid determiner determines that the skid has occurred when the difference is out of a range defined by skid detection threshold values.

4 more elements

A method of detecting a skid occurred on a vehicle having a prime mover and a transmission that changes an output of the prime mover in speed and transmits the output to front right/left wheels and rear right/left wheels to drive them, comprising the steps of:

detecting each rotational speed of the front wheels and that of the rear wheels;
calculating an actual rear right/left wheel speed ratio between the rear right/left wheel speeds based on the detected front wheel rotational speed and the rear wheel rotational speed;
calculating a front/rear wheel slip ratio during grip-driving by retrieving characteristics of a front/rear wheel slip ratio set with respect to a rear right/left wheel speed ratio using the calculated actual rear right/left wheel speed ratio, which characteristics are calculated and prepared in advance based on assumption that the front and rear wheels grip a road;
calculating an actual front/rear wheel slip ratio based on the detected front wheel rotational speed and the rear wheel rotational speed;
and
determining that a skid has occurred based on a difference between the calculated front/rear wheel slip ratio during grip-driving and the calculated actual front/rear wheel slip ratio,
wherein the step of skid determining determines that the skid has occurred when the difference is out of a range defined by skid detection threshold values.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/910,563Filed 22 Oct 2010
Priority: JP 2009-25108530 Oct 2009
Published: US 2011/0106378 A15 May 2011
Granted: 2 Jul 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B60T 8/1769
Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS: specially adapted for vehicles having…
B60T 8/1755
Using electrical or electronic regulation means to control braking: brake regulation specially adapted to control the stability of the vehicle,…
B60T 8/17616
Responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure: microprocessor-based systems
B60T 2270/12
ABS control systems: for all-wheel drive vehicles