CN2559969Y

CN2559969Y - Vehicle fuel tank fuel consumption monitoring & controlling apparatus

Info

Publication number: CN2559969Y
Application number: CN 02252131
Authority: CN
Inventors: 杨卜凡; 乐斌
Original assignee: Fujian electronic technology research institute; Xiamen European Intelligent Traffic Equipment Co Ltd
Current assignee: Fujian electronic technology research institute; Xiamen European Intelligent Traffic Equipment Co Ltd
Priority date: 2002-08-23
Filing date: 2002-08-23
Publication date: 2003-07-09
Anticipated expiration: 2012-08-23

Abstract

The utility model relates to an oil flow monitoring device, in particular to the monitoring device of the oil consumption of vehicles. The utility model is provided with an oil flow monitoring circuit and comprises an oil flow sensor signal-input circuit, a voltage-frequency converter, a central processing unit and a power supply. An input end is externally connected with the oil flow sensor of vehicles; the output end of the sensor signal-input circuit is connected with the central processing unit by the voltage-frequency converter. Since input signals come from the sensor, the output voltage changes with the change of oil consumption, thereby, each driving in any time segment is recorded a plurality of corresponding parameters. The parameters are dynamic and diminishes gradually, thus the position of the oil standard at anytime of the segment can be determined. Furthermore, if the oil is properly used can be judged by the relation between the oil consumption and the travel route; or, if the oil is properly used can be judged by the comparison between the position of the oil standard when the vehicle stops and the poison of the oil standard when the vehicle restarts. The utility model which has the advantages of simple structure, small volume, light weight and low cost can be made into a little box as the black box of vehicles.

Description

Oil tank of vehicle oil consumption supervising device

The utility model relates to a kind of oil mass pick-up unit, especially oil tank of vehicle oil consumption supervising device.

Existing all kinds of automobile generally all is provided with fuel level gauge, shows the instant oil reserve of fuel tank.It is to utilize the float that is provided with in the fuel tank to drive the variable-resistance variation of sensor with the variation of fuel tank intermediate fuel oil amount, thereby changes the position of fuel level gauge pointer.But whether the fuel oil in the oil tank of vehicle normally uses but be difficult to detect and monitor.

The utility model aims to provide a kind of energy reflection, registration of vehicle fuel tank fuel quantity operating position and carries out the device of qualitative detection.

Another purpose of the present utility model is that the improper use of the fuel oil of oil tank of vehicle is monitored.

The utility model is provided with the oil mass supervisory circuit, it comprises fuel-quantity transducer signal input circuit, voltage to frequency converter, central processing unit, power supply, the external vehicle fuel-quantity transducer of the input end of fuel-quantity transducer signal input circuit, the input end of the output termination voltage to frequency converter of fuel-quantity transducer signal input circuit, the output termination central processing unit (containing storer) of voltage to frequency converter; Housing is used for supporting and containing oil mass supervisory circuit.

Because input signal of the present utility model is from the vehicle fuel tank fuel quantity signal of sensor, and fuel-quantity transducer is 1 probe that is subjected to the control of oil tank fuel buoyancy, how many its output voltages changes with fuel oil, writing down once travelling of arbitrary time period like this, all write down corresponding a plurality of parameter (deciding) on the sample frequency and the method for sampling, this parameter is dynamic change, and is (except the oiling) that gradually reduces, and can determine the oil ga(u)ge position in this arbitrary time of interval thus.And can by the vehicle oil consumption and the relation curve of stroke judge the oil tank of vehicle fuel oil whether by normal use or during by vehicle parking oil ga(u)ge position and vehicle recurrence during the step oil ga(u)ge position judge that relatively the oil tank of vehicle fuel oil is whether by normal the use (both identical or latter are considered as normally than the former oiling of Duoing).Obviously, of the present utility model simple in structure, volume is little, in light weight, cost is low, can be made into the black box of a capsule as vehicle.

Fig. 1 is the outside drawing of the utility model embodiment.

Fig. 2 is the oil mass supervisory circuit composition frame chart of the utility model embodiment.

Fig. 3 is the oil mass supervisory circuit schematic diagram of the utility model embodiment.

Fig. 4 is the relation curve of vehicle oil consumption and stroke.

Fig. 5 is the relation of vehicle oil mass and startup, stop frequency.

Following examples will be further described the utility model in conjunction with the accompanying drawings.

Shown in Fig. 1～3, present embodiment is provided with housing 1 and oil mass supervisory circuit.The oil mass supervisory circuit is located in the housing, is made up of fuel-quantity transducer signal input circuit 2, voltage to frequency converter 3, central processing unit (containing storer) 4 and power supply etc., and the input interface of fuel-quantity transducer signal input circuit 2 is located on the housing 1.The signal voltage output terminal of the external vehicle fuel-quantity transducer of the input interface of fuel-quantity transducer signal input circuit 2, the input end of the output termination voltage to frequency converter 3 of fuel-quantity transducer signal input circuit, the output termination central processing unit (containing storer) 4 of voltage to frequency converter 3.Power supply can be outward if built-in.

The voltage signal that is obtained by fuel-quantity transducer adds voltage to frequency converter, and the latter produces the pulse signal of a frequency that changes with voltage, and this signal is input to central processing unit, handles and deposit in storer by the central processing unit pulse signals.

In Fig. 3,0～24V that obtains on the sensor or the d. c. voltage signal of 0～12V, be input on the IYH of voltage to frequency converter, through R18, the dividing potential drop of R19 is added to the 7th pin of integrated circuit U1 (LM231), carry out electric voltage frequency conversion by LM231, then from the 3rd pin output pulse signal of LM231.(frequency of pulse is 0Hz during 0V, and the frequency of pulse is 5KHz during 12V, and the frequency of pulse is 8KHz during 24V).Pulse signal is counted by the counter that YHMC delivers to central processing unit (CPU).

Fuel-quantity transducer is a variable resistor that is subjected to buoyancy control, when fuel tank intermediate fuel oil amount more for a long time, buoyancy rises, resistance of sensor reduces, its voltage reduces, the input voltage of electric voltage/frequency converter LM231 reduces, the conversion ratio step-down of LM231.If buoyancy descends, the LM231 inversion frequency uprises, and writing down once travelling of arbitrary time period, all records minimum and highest frequency like this, this two number be dynamic change we can adopt successive approximation algorithm correction, through just determining oil ga(u)ge extreme higher position and extreme lower position after N time.

To further determine normally to be used, availablely judge as the oil consumption of Fig. 4 and the relation curve of stroke the such one section oil mass of travelling.

For example automobile fuel consumption per hundred kilometers curve is a parameter of each automobile, and the cruising curve has difference, but should difference too not big, as Fig. 4, by a to b, refuels c when b, arrives d again, and slope is roughly the same.Refuel e at d, the oil consumption of travelling is to f, and slope is too big, promptly in that very the short distance oil consumption is too big, illustrates that oil consumption is undesired.

Below explanation is to the quantification treatment of oil ga(u)ge, referring to Fig. 5, assign to fuel tank is divided with 100 grades, just enable automobile black box owing to can't require vehicle user must fill it up with oil during practice, thereby just can't carry out minimum and maximum the demarcation to oil ga(u)ge, also just can't draw the oil mass in the current a certain moment.But we represent certain startup respectively with two unit, the highest minimum measurement of correspondence during parking, i.e. and fmax and fmin set up the two-dimensional coordinate of oil mass and startup, stop frequency.

F1max, f2max ..., fnmax starts to parking oil mass maximal value at every turn,

F1min, f2min ..., fnmin starts to parking oil mass minimum value at every turn,

Then get fmax=Max (f1max, f2max ... fnmax)

fmin＝Min(f1min，f2min，……fnmin)

After n reached some, above-mentioned fmax and fmin can keep relative stability, and can think that these two values are corresponding oil mass 100 and 0, thereby can realize demarcating, and drew the oil mass in any moment.

Claims

1, oil tank of vehicle oil consumption supervising device is characterized in that being provided with

The oil mass supervisory circuit, comprise fuel-quantity transducer signal input circuit, voltage to frequency converter, central processing unit, power supply, the external vehicle fuel-quantity transducer of the input end of fuel-quantity transducer signal input circuit, the input end of the output termination voltage to frequency converter of fuel-quantity transducer signal input circuit, the output termination central processing unit of voltage to frequency converter, central processing unit contains storer;

Housing is used for supporting and containing oil mass supervisory circuit.

2, oil tank of vehicle oil consumption supervising device as claimed in claim 1 is characterized in that the input interface of fuel-quantity transducer signal input circuit is located on the housing.

3, oil tank of vehicle oil consumption supervising device as claimed in claim 1 is characterized in that said power supply is outer if built-in.