CN101758776B

CN101758776B - Vehicle inclination sensing device

Info

Publication number: CN101758776B
Application number: CN 200810190217
Authority: CN
Inventors: 蔡翼阳; 张森宪
Original assignee: Kwang Yang Motor Co Ltd
Current assignee: Kwang Yang Motor Co Ltd
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2013-07-31
Anticipated expiration: 2028-12-26
Also published as: CN101758776A

Abstract

The invention relates to a vehicle inclination sensing device which mainly comprises a sensor, a comparing circuit and a switching circuit, wherein the sensor induces a vehicle inclining state and transmits a sensing signal; the comparing circuit judges whether a vehicle inclining angle is larger than a critical value or not according to the sensing signal transferred by the sensor so as to transfer a control signal; and the switching circuit receives the control signal transferred by the comparing circuit and controls the operation of an engine controller according to the control signal. The invention judges whether the vehicle inclining angle is overlarge or not by utilizing the analog-digital comparing circuit; and compared with an expensive digital chip, the invention has the advantage of low cost without poor mechanical action.

Description

Vehicle inclination sensing device

Technical field

The present invention relates to a kind of vehicle inclination sensing device,, be used to judge whether to stop the action of car engine controller in order to the senses vehicle angle of inclination.

Background technology

Generally in order to prevent engine controller (ECU) still continuous running and initiation potential behind inclination of vehicle, manufacturer is arranged then in the angle of inclination of vehicle interior installing tilting sensing device with the sensing car body, when judging that the tilting of car body angle is excessive, can stop the running of car engine controller at once, avoid the dangerous facts to take place.

Existing tilting sensing device comprises the sensing device of mechanical type and electronic type.The mechanical type tilting sensing device as shown in Figure 3, its inside wabble mechanism (60) that is pivoted, and bottom wabble mechanism (60), be provided with magnet (61), in magnet (61) below Hall subassembly (62) is set at interval again, when the vehicle run-off the straight, relative position system between magnet (61) and the Hall subassembly (62) produces and changes, and Hall subassembly (62) is satisfied because of changes of magnetic field produces sensing signal, is used to judge vehicle-state.

Because traditional mechanical type tilting sensing device takes up space, and cause swinging bad or block fully when motionless, may cause the engine controller misoperation in external impact or wabble mechanism (60) long-term use.

About the electronic type tilting sensing device, can announce novel patent M335683 number with reference to TaiWan, China, little process chip that it mainly uses the acceleration pick-up at detecting vehicle angle of inclination and connects this acceleration pick-up, utilize this little process chip according to measured each the axial acceleration variable quantity of acceleration pick-up evaluation in addition, and judicious tilt condition and export judgement information.Yet employed little process chip cost costliness will make the vehicle manufacturing cost improve relatively.

Therefore, how to provide effectively and the cheap relatively tilting sensing device of cost the necessity that remains further solution.

Summary of the invention

As shown in the above description, existing machinery formula tilting sensing device takes up space and long-term use has the anxiety of easy fault, and it is not striking to be built in its price of digit chip of electronic type tilting sensing device in existing, and it is many to make that cost also improves relatively.

In view of this, main purpose of the present invention is to provide a kind of vehicle inclination sensing device, the defective that does not have mechanical device, and can reach electronic type senses vehicle angle of inclination equally by cheap relatively cost, and judge whether to stop the action of car engine controller.

Desiring to reach the employed technological means of above-mentioned purpose, is to make this vehicle inclination sensing device comprise:

Sensor, induction tilting of car body state and send sensing signal;

Comparator circuit connects sensor, and whether this comparator circuit judges the tilting of car body angle greater than critical value according to the sensing signal that sensor transmitted, and then transfer control signal; And

Switch circuit connects this comparator circuit and receives aforementioned control signal, according to this control signal and whether the Control Engine controller operates,

Wherein, described comparator circuit comprises first comparator and second comparator, and the in-phase input end of described first comparator is connected described sensor jointly with the inverting input of second comparator; The inverting input of described first comparator connects high VREF (Voltage Reference); The in-phase input end of described second comparator connects low VREF (Voltage Reference); Described first comparator is connected described switch circuit jointly with the mouth of second comparator,

Wherein, described switch circuit comprises transistor and bleeder circuit, and described transistor base connects the mouth of described first comparator and second comparator; Described bleeder circuit comprises several and is connected in resistance between constant potential and the ground terminal, and its dividing potential drop mid point connects described transistorized collecting electrode.

The angle of inclination of the corresponding car body of the sensing signal that sensor transmitted, aforementioned comparator circuit can be by judging the sensor input sensing signal magnitude of voltage size between or exceed specific voltage value scope, and the interpretation car body tilts angle between or exceed zone of reasonableness, thereby the output difference controls signal to switch circuit, provide this switch circuit as foundation, make engine controller continue running or termination with switching.Therefore, the present invention is with respect to prior art, not only do not have the mechanical type long-term use and cause moving condition of poor and produce, and whether excessive by the simple comparator circuit of design with analog-to-digital mode interpretation car body inclination angle, more can save cost than the existing mode of the digit chip of high price that adopts.

Description of drawings

Fig. 1 is the block diagram representation of one embodiment of the present invention;

Fig. 2 is the circuit diagram of one embodiment of the present invention;

Fig. 3 is the section-drawing of existing machinery formula tilting sensing device.

The specific embodiment

With reference to the block diagram representation and the circuit diagram of vehicle inclination sensing device of the present invention one preferred embodiment of Figure 1 and Figure 2, it comprises:

Sensor (10), respond to the tilting of car body state and send sensing signal, in the present embodiment, this sensor (10) can be acceleration pick-up (G-sensor), can when induction tilting of car body angle, send the signal of different voltage levvls as sensing signal with different angle correspondences; As shown in Figure 2, this sensor (10) but in present embodiment the axial heeling condition of this car body of dipulse governor three, so can comprise three axial mouths (101,102,103) to export disalignment respectively to measured sensing signal;

Comparator circuit (20) connects sensor (10), and whether the sensing signal that this comparator circuit (20) is transmitted according to sensor (10) judges the tilting of car body angle greater than critical value, and then transfer control signal; As shown in Figure 2, this comparator circuit (20) comprises first comparator (21) and second comparator (22) in the present embodiment, respectively has in-phase input end (210,220), inverting input (211,221) and mouth (212,222); Wherein, the in-phase input end (210) of this first comparator (21) is connected this sensor (10) jointly with the inverting input (221) of second comparator (22); The inverting input (211) of this first comparator (21) connects high VREF (Voltage Reference) V2 (for example 2.48 volts); The in-phase input end (220) of this second comparator (22) connects low VREF (Voltage Reference) V1 (for example 1.1 volts); And

Switch circuit (30), connect this comparator circuit (20) and receive the control signal that it transmits, whether control the engine controller (50) that is installed in the car body according to this control signal operates, as shown in Figure 2, this switch circuit (30) mainly comprises transistor (31) in the present embodiment, its base stage is connected to the mouth (212 of aforementioned first comparator (21) and second comparator (22), 222), this bleeder circuit (32) is connected between constant potential 5V and the ground terminal by several resistance string and constitutes, its dividing potential drop mid point connect this transistor (31) collecting electrode and as the mouth of this switch circuit (30).

For cooperating three axial mouths (101,102,103) of sensor (10); This vehicle inclination sensing device can further comprise switching device (40), this switching device (40) has and connects these three axial mouths (101 respectively, 102,103) three input ends (401,402,403), this switching device (40) also has the mouth (404) of the input end that connects this comparator circuit (20) (that is inverting input (221) of the in-phase input end (210) of first comparator (21) and second comparator (22)), and for the output of switching each axial sensing signal whether this switching device (40).

With Fig. 2 is example, when sensor (10) transmits sensing signal to comparator circuit (20), this sensing signal is imported first and second comparator (21 respectively, 22), if the sensing signal magnitude of voltage is between low VREF (Voltage Reference) V1 and high VREF (Voltage Reference) V2 the time, represent the angle that tilts that car body line perpendicular to the ground compares all less than critical angle, first and second comparator this moment (21,22) is all exported the low-level voltage of 0V; When if the sensing signal magnitude of voltage is lower than VREF (Voltage Reference) V1 or is higher than high VREF (Voltage Reference) V2, the angle that tilts of promptly representing car body line perpendicular to the ground to compare all surpasses critical angle, the anxiety of overturning is arranged, the high-level voltage of first or second comparator (21,22) output this moment 5V.

When high and low horizontal voltage inputs to switch circuit (30), wherein, low-level voltage (0V) can't drive aforementioned transistor as switch (31) conducting, makes switch circuit (30) can make engine controller keep the suitable dividing potential drop of operating state by its bleeder circuit (32) output; The then driving transistors conducting of high level voltage (5V), the dividing potential drop that the bleeder circuit (32) of switch circuit this moment (30) is exported can't make engine controller continue running, thereby engine controller is stopped.

In sum, the present invention cooperates suitably height VREF (Voltage Reference) by design comparator circuit (20), carrying out suitable inclination angle with the sensing signal to sensor (10) input judges, thereby the control signal of exporting high and low voltage levvl is given switch circuit (30), switch circuit (30) switch engine controller running according to this or stop again.The mode of this analog-to-digital adopts the digit chip of high price to carry out the data operation judgement with respect to prior art, can provide identical tilting of car body safety precaution effect by cheaper cost, and not have the defective of the easy et out of order of mechanical type tilting sensing device swinging gear equally.

Claims

1. a vehicle inclination sensing device supplies to be installed on the car body with engine controller, it is characterized in that:

Described vehicle inclination sensing device comprises:

Sensor, induction tilting of car body state and send sensing signal;

Comparator circuit connects sensor, and whether described comparator circuit judges the tilting of car body angle greater than critical value according to the sensing signal that sensor transmitted, and then transfer control signal; And

Switch circuit connects described comparator circuit and receives aforementioned control signal, according to described control signal and whether the Control Engine controller operates,

2. vehicle inclination sensing device as claimed in claim 1 is characterized in that:

Described sensor is an acceleration pick-up, and

But the heeling condition that the described car body of described sensor sensing three is axial, and comprise three axial mouths, to export disalignment respectively to measured sensing signal; Described vehicle inclination sensing device further comprises switching device, described switching device has three input ends that connect described three axial mouths respectively, and having a mouth of the input end that connects described comparator circuit, for the output of switching each axial sensing signal whether described switching device.