Method for reducing erroneous judgment on separated road state, turning judgment method, controller and corresponding vehicle

A technology that separates road surfaces and vehicles. It is applied in the field of vehicles and judges the turning of vehicles. It can solve the problems of low deceleration, hardening of the brake pedal in the stopping distance, and reduced vehicle braking performance. It can increase the braking pressure, simplify the system composition, The effect of good braking performance

Active Publication Date: 2014-05-07
BOSCH AUTOMOTIVE PROD SUZHOU
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Problems solved by technology

As a result, such misjudgments can significantly reduce the braking performance of the vehicle, causing the vehicle to underbrake with longer stopping distances or even stiffen the brake pedal
"Brake pedal hardening" means that the vehicle has a relatively low deceleration compared to the road adhesion coefficient, but the driver cannot depress the brake pedal further to obtain better deceleration

Method used

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  • Method for reducing erroneous judgment on separated road state, turning judgment method, controller and corresponding vehicle

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Embodiment Construction

[0022] As mentioned above, for a vehicle braking system with an ABS controller, the system is usually equipped with one wheel speed sensor for each wheel to measure the corresponding rotational speed of each wheel, that is, usually four wheel speed sensors are equipped to measure four The rotational speed of the wheels. Due to cost and other factors, many vehicles do not have other sensors, such as lateral acceleration sensors, steering angle sensors, or yaw acceleration sensors (ie, the acceleration of the vehicle's swing about a vertical axis). In the absence of other sensors, it is necessary to judge the driving state of the vehicle based on the output signals of each wheel speed sensor, such as the turning state (such as the J-turn state) and the separation road state.

[0023] Specifically, in the case of separated road surfaces, since the adhesion coefficients on the left and right sides of the vehicle are significantly different, under the same wheel pressure, the wheel...

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Abstract

The invention provides a method for reducing the situation that a J-shaped turning state is erroneously judged to be a separated road state. When the separated road state is initially detected and an ABS of a vehicle is started, the method continues to execute the following steps that the absolute value |vDiff_Geo| of a geometric sliding rate is calculated, the geometric sliding rate is |vDiff_Geo|= (vFR-vFL)-(vRR-vRL), vFR is the speed of a right front wheel, vFL is the speed of a left front wheel, vRR is the speed of a left rear wheel, and vRL is the speed of a left rear wheel; a first specific value of the speed ratio of the left rear wheel to the right rear wheel and a second specific value of the speed ratio of the right rear wheel to the left rear wheel are calculated; the absolute value of the geometric sliding rate is compared with a set first threshold value, whether the first specific value or the second specific value is within a set area range or not is judged, and whether the situation that the J-shaped turning state is erroneously judged to be the separated road state exists or not is determined according to a comparison result and a judgment result. The invention further discloses a method for judging vehicle turning, a controller and a vehicle. The method can reduce erroneous judgment, and brake performance can be improved.

Description

technical field [0001] The invention relates to a method capable of reducing the misjudgment of a J-shaped turning state as a separated road surface state, a method for judging a turning of a vehicle, a controller for executing the method, and a vehicle including the controller. Background technique [0002] At present, many motor vehicles are equipped with ABS (anti-lock braking system) to prevent the wheel from locking when braking, which greatly improves the safety performance of the vehicle. In ABS, a wheel speed sensor is used to monitor the rotational speed of the wheels, and the monitoring signal is output to the electronic controller of the vehicle. When the electronic controller judges that the wheel may be locked through the monitoring signal, the electronic controller sends a corresponding command to the electromagnetic regulator, and the electromagnetic regulator controls the oil pressure distribution valve to adjust the brake cylinder of the corresponding wheel,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/172B60T8/1755B60T8/24
Inventor 俞雷兵
Owner BOSCH AUTOMOTIVE PROD SUZHOU
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