RU2067751C1 - Device checking pressure in driving wheels of automobile - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: invention is meant to check pressure in driving wheels of automobile when she moves. Apart from pickup 1 of revolutions of wheel and pickup 2 of revolutions of cardan shaft, first and second counters 3, 4 device includes third counter 5 and first differentiating circuit 7 connected in series, second differentiating circuit 6, memory register 8 and decoder 9 connected in series, light and sound indicators 10, 11. Output of pickup 1 of revolutions of wheel is connected to input of first counter 3 which output is linked to inputs of third counter 5 and second differentiating circuit 6. Outputs of pickup 2 of revolutions of cardan shaft is connected to input of second counter 4 which output is connected to second input of memory register 8. Output of first differentiating circuit 7 is connected to setting inputs of counters 3, 4 and 5. EFFECT: indication system generates information not only on pressure on wheel if it below rated one but on degree of pressure drop determined by duty factor of light and audio signals. 1 dwg

Description

 The invention relates to instrumentation and can be used to control tire pressure in the car during movement.

A device for monitoring tire pressure of vehicles comprising wheel speed sensors and a pulse processing system [1]
Closest to the invention is a device for signaling a pressure drop in the tires of a car while driving, comprising wheel and propeller shaft speed sensors and first and second counters [2]
The known device has a large time for detecting a pressure drop in the wheel, requires the installation of speed sensors on each of the wheels of the car, and the pressure control in the wheels is performed sequentially.

 The invention is aimed at eliminating these disadvantages of the known device.

 The essence of the invention lies in the fact that the known device is equipped with a third counter and a first differentiating circuit connected in series and a second differentiating circuit, a memory register, a decoder and an indicator block connected in series, which is made in the form of light and sound indicators connected in parallel, while the output of the wheel speed sensor connected to the input of the first counter, the output of which is connected to the inputs of the third counter and the second differentiating circuit, the output of the cardan speed sensor the first shaft is connected to the input of a second counter whose output is connected to the second input of the storage register, the output of the first differentiating circuit connected to the inputs of zero-setting the first, second and third counters.

 The invention is illustrated in the drawing.

 The pressure monitoring device in the driving wheels of the vehicle contains a sensor 1 of the rear wheel speed, a sensor 2 of the driveshaft speed, counters 3, 4, 5, differentiating circuits 6, 7, memory register 8, decoder 9, light 10 and sound 11 indicators.

The device operates as follows. The counter 3 with the counting module m receives pulses from the wheel speed sensor 1, and the counter 4 with the counting module n pulses from the speed sensor of the propeller shaft 2. For one revolution of the propeller shaft, the sensor 2 gives R pulses. The values of n and m are selected from the relation
n mRN _i ,
where N _{i is the} gear ratio of the main pair of gears of the differential of the automobile bridge.

 Counter 5 has a counter module K. At the time when counter 3 counts to m, counter 5 changes its state to 1, and counter 4, if the wheel has normal pressure, counts the value n. This value of counter 4 is written into memory 8 and fed to the decoder. If the deviation of the obtained number of pulses from the given n is small, then there is no signal at the output of the decoder 9. The general cycle ends when the counter 5 is counted to a value of k.

 If the pressure in the wheel drops during the counting of revolutions by the counter 3 to m in the counter 4, the value of the number will be less than the specified n, for example, it will be n 1. Let the decoder 9 give a signal if at its input the number is more than 2 or less (n 2 ) Then, already in the third cycle of counting counter 3, the output of counter 4 will be the number n 3, which will turn on the display system through memory 8 and decoder 9.

 Depending on the degree of pressure drop in the wheel, the number of counting cycles by the counter 3, which is necessary to turn on the alarm (indication), changes.

 Thus, the duty cycle of light and sound signals can be used to judge the degree of pressure reduction in the wheel.

 If the pressure drops in the wheel on which the sensor is not installed, it starts to rotate faster, and due to the differential action of the bridge gear differential, the wheel with the sensor will rotate more slowly. In this case, for each cycle of counting counter 3, counter 4 will count the number of pulses greater than n, and depending on the degree of pressure drop in the second wheel, the device gives a signal in the first or subsequent cycles of counting counter 3.

Claims (1)

 A device for controlling pressure in driving wheels of a vehicle, comprising wheel and propeller shaft speed sensors and first and second counters, characterized in that it is provided with a third counter and a first differentiating circuit connected in series and a second differentiating circuit, a memory register, a decoder and an indicator block connected in series, which is made in the form of parallel-connected light and sound indicators, while the output of the wheel speed sensor is connected to the input of the first counter, the output of which o connected to the inputs of the third counter and the second differentiating circuit, the output of the cardan shaft speed sensor is connected to the input of the second counter, the output of which is connected to the second input of the memory register, and the output of the first differentiating circuit is connected to the zero-setting inputs of the first, second and third counters.