Method and device for detecting a drop in pressure in motor vehicle tires
First Claim
1. A method for detecting a pressure loss in a tire in a motor vehicle during travel including detecting a seating of the tire casing on an emergency tread in the tire or a drop of the tire pressure below a threshold value, the method comprising the steps of:
- detecting the respective angular velocities of the wheels of said motor vehicle utilizing sensors assigned to corresponding ones of said wheels;
detecting a loss of pressure in the tire of at least one of said wheels from an increase in the angular velocity of said one wheel relative to the angular velocities of said other wheels; and
, after said loss of pressure, detecting a sudden decrease in the ancular velocity of said one wheel indicating a massive loss of air pressure.
0 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a method for detecting a drop in pressure of a motor vehicle tire by evaluating wheel speeds determined by sensors. The method for detecting the drop in pressure is based on the detection of a large drop in pressure or a complete drop in pressure using a reduction of the angular velocity or an increase (8) in the dynamic read radius rd of one or more wheels. The invention also relates to a device for controlling the braking power and/or driving dynamics and for measuring the pressure of vehicle tires wherein a microcomputer, which is connected to wheel rotational speed sensors and optionally to driving dynamic sensors, is used to perform the aforementioned method and a known method for regulating the braking power and/or driving dynamics.
8 Citations
18 Claims
-
1. A method for detecting a pressure loss in a tire in a motor vehicle during travel including detecting a seating of the tire casing on an emergency tread in the tire or a drop of the tire pressure below a threshold value, the method comprising the steps of:
-
detecting the respective angular velocities of the wheels of said motor vehicle utilizing sensors assigned to corresponding ones of said wheels;
detecting a loss of pressure in the tire of at least one of said wheels from an increase in the angular velocity of said one wheel relative to the angular velocities of said other wheels; and
,after said loss of pressure, detecting a sudden decrease in the ancular velocity of said one wheel indicating a massive loss of air pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An arrangement for controlling the braking force and/or the driving dynamic and for measuring the pressure of tires in a motor vehicle, the arrangement comprising:
-
sensors for detecting the respective angular velocities of the wheels of said motor vehicle;
a microcomputer connected to said sensors;
said microcomputer functioning to carry out a method including the steps of;
detecting the respective angular velocities of the wheels of said motor vehicle utilizing sensors assigned to corresponding ones of said wheels;
detecting a loss of pressure in the tire of at least one of said wheels from an increase in the angular velocity of said one wheel relative to the angular velocities of said other wheels; and
after said loss of pressure, detecting a sudden decrease in the angular velocity of said one wheel indicating a massive loss of air pressure; and
,said microcomputer further functioning to carry out a method for controlling the braking force and/or driving dynamic.
-
-
13. A method for detecting a pressure loss in a tire in a motor vehicle during travel including detecting a seating of the tire casing on an emergency tread in the tire or a drop of the tire pressure below a threshold value, the method comprising the steps of:
-
providing sensors for detecting the respective angular velocities of the wheels of said motor vehicle; and
,detecting the loss of pressure in at least one of said tires by detecting a high pressure loss or a total pressure loss in said tire based at least on one of the following;
a reduction of the angular velocity of one or more wheels and/or an increase of the dynamic rolling radius rd of one or more of said wheels; and
,wherein the pressure loss detecting method includes a first further submethod (Prog A) and a second further submethod (Prog B);
both further submethods generate one or more reference quantities Refi from the angular velocities or informations which indicate the angular velocities on the basis of time intervals; and
, thereupon a check is made of the reference quantity or quantities as to whether upper and lower limit values G1 and G2 are exceeded; and
, the second further submethod (Prog B) has limit values BG1 and BG2 which define a narrower range than the limit values AG1 and AG2 of the first further submethod (Prog A) so that BG1<
AG1 and BG2>
AG2.- View Dependent Claims (14, 15, 16, 17, 18)
-
Specification