CN105275642A - Engine rotation speed control structure and control method thereof during rear power take-off - Google Patents
Engine rotation speed control structure and control method thereof during rear power take-off Download PDFInfo
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- CN105275642A CN105275642A CN201510766891.6A CN201510766891A CN105275642A CN 105275642 A CN105275642 A CN 105275642A CN 201510766891 A CN201510766891 A CN 201510766891A CN 105275642 A CN105275642 A CN 105275642A
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Abstract
The invention provides an engine rotation speed control structure and a control method thereof during rear power take-off. The control structure comprises an electronic control unit (ECU) and a rear power take-off switch. The ECU comprises a first port and a second port. The rear power take-off switch comprises a first contactor, a second contactor, a third contactor, a fourth contactor and a preset resistor. The preset resistor is arranged on the circuit where the third contactor is located. The first contactor is connected with a power source capable of supplying power. The first port is connected with the second contactor. The fourth contactor is used for switching on a rear power take-off device. The second port is connected with the third contactor. When the rear power take-off switch is switched off, the second contactor is communicated with the third contactor, and the first contactor is communicated with the fourth contactor. According to the engine rotation speed control structure and the control method thereof, the maximum rotation speed of an engine does not exceed a rotation speed threshold value during rear power take-off, and accordingly the safety during rear power take-off is ensured.
Description
Technical field
The present invention relates to the field of engine control of vehicle, control of engine speed structure when particularly relating to a kind of rear power taking and controlling method thereof.
Background technique
When vehicle parking power taking, in order to meet rear power takeoff to the demand of engine speed, the Security of rear power taking can be ensured again, require that the rotating speed of motor can not be too high, therefore, when vehicle parking power taking, need the rotating speed controlling motor.Such as, the maximum speed of diesel engine can reach more than 2500rpm, but in the application of rear power takeoff reality, do not need so high rotating speed, too high rotating speed easily causes potential safety hazard on the contrary.For meeting the requirement of Safety performance, after requiring, power taking vehicle is when parking power taking, the rotating speed≤1500rmp of motor.
At present, control method for engine speed during rear power taking has two kinds, and one tramples gas pedal by driver, the rotating speed of manual control motor, this method needs driver by virtue of experience to control engine speed, and different drivers differs to control of engine speed during parking power taking.Another method controls engine constant speed running by PTO (English full name is powertakeoff, and Chinese full name is Power output) function.
But these two kinds of methods all cannot the maximum speed of limiting engine when rear power taking, therefore, all may there is certain potential safety hazard in the control method for engine speed after above-mentioned two kinds during power taking.
Summary of the invention
In view of this, control of engine speed structure when the invention provides a kind of rear power taking and controlling method thereof, with the maximum speed of volitional check motor when rear power taking, and then the Security of power taking after improving.
In order to solve the problems of the technologies described above, present invention employs following technological scheme:
Control of engine speed structure during rear power taking, comprising:
ECU and rear power taking switch, described ECU comprises first interface and the second interface, and described rear power taking switch comprises the first contact, the second contact, the 3rd contact, the 4th contact and preset resistance; Described preset resistance arranges on the circuit at described 3rd place, contact;
Described first contact with can be connected by power supply;
Described first interface connects described second contact;
Described 4th contact is for connecting rear power takeoff;
Described second interface connects described 3rd contact;
When described rear power taking switch is in closed state, described second contact is communicated with described 3rd contact, and described first contact is communicated with described 4th contact.
Alternatively, described structure also comprises many small power oil switch, and described rear power taking switch also comprises the 5th contact;
Described second interface connects one end of described many small power oil switch, and the other end of described many small power oil switch connects described 5th contact;
When described rear power taking switch disconnects, described second contact is communicated with described 5th contact, and described first contact and described 4th contact disconnect.
Alternatively, described rear power taking switch also comprises: the 6th contact being in vacant state; When described rear power taking switch disconnects, described first contact is communicated with described 6th contact.
Alternatively, described many small power oil switch comprises: first resistance of connecting successively, the second resistance, the 3rd resistance and the 4th resistance;
Wherein, between the first resistance and the second resistance, draw A contact, between the second resistance and the 3rd resistance, draw B contact, between the 3rd resistance and the 4th resistance, draw C contact, draw D contact in the back of the 4th resistance;
Wherein, described second interface is connected with described first resistance; When described rear power taking switch closes, described 3rd contact is connected with described 4th resistance.
Control method for engine speed during rear power taking, described method adopts the structure described in above-mentioned arbitrary mode of execution, and described method comprises:
When motor carries out rear power taking, ECU obtains the resistance value of described preset resistance;
ECU obtains the voltage status corresponding with the resistance value of described preset resistance according to the resistance value of described preset resistance by the logical function demarcation of self;
The ECU voltage status corresponding according to the resistance value of described and described preset resistance limits the maximum speed of motor under the voltage status that the resistance value of described and described preset resistance is corresponding, makes the maximum speed of motor during rear power taking be no more than rotary speed threshold value.
Alternatively, described method adopts the 4th kind of structure described in mode of execution, and described method also comprises:
When described rear power taking switch disconnects, described ECU obtains the resistance value in the oil switch of many small power;
ECU obtains the voltage status corresponding with the resistance value in the oil switch of described many small power according to the resistance value in the oil switch of described many small power by the logical function demarcation of self;
ECU limit under the corresponding voltage status of the resistance value of motor in the oil switch of described and described many small power rotating speed and moment of torsion.
Compared to prior art, the present invention has following beneficial effect:
From such scheme, in control of engine speed structure during rear power taking provided by the invention and controlling method thereof, ECU can demarcate according to the resistance value of the preset resistance in rear power taking switch and obtain voltage status corresponding to this resistance value, then ECU carries out Control for Speed Limitation according to this voltage status to engine speed during rear power taking, thus control after power taking time motor maximum speed, the maximum speed of motor during rear power taking is made to be no more than a rotary speed threshold value, and then the Security after ensureing during power taking.
Accompanying drawing explanation
In order to be expressly understood technological scheme of the present invention, the accompanying drawing used is done a brief description below when describing the specific embodiment of the present invention.Apparently, these accompanying drawings are only section Example of the present invention, and those skilled in the art, under the prerequisite not paying creative work, can also obtain other accompanying drawing.
Fig. 1 be the embodiment of the present invention one provide rear power taking time the structural representation of control of engine speed structure;
Fig. 2 be the embodiment of the present invention one provide rear power taking time the schematic flow sheet of control method for engine speed;
Fig. 3 is the principle schematic of the many small power oil switch in correlation technique;
Fig. 4 be the embodiment of the present invention two provide rear power taking time the structural representation of control of engine speed structure;
Fig. 5 be the embodiment of the present invention two provide rear power taking time the schematic flow sheet of control method for engine speed.
Embodiment
For making the object of the embodiment of the present invention, technological scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technological scheme in the embodiment of the present invention is clearly described, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiment.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not paying creative work, belong to the scope of protection of the invention.
In order to clearly understand technological scheme of the present invention, the technical term used when first introducing the lower description specific embodiment of the invention.
ECU: Chinese is electronic control unit, and English name is ElectronicControlUnit, be that a kind of signal inputted according to each sensor runs computing, process, judgement, then output order controls the controller of final controlling element action.
Speed changer power take-off valve: non-automatic-reset formula inching switch is a kind of switch controlling gearbox power stage, is also rear power taking switch.
The specific embodiment of the present invention is introduced below in conjunction with accompanying drawing.First see embodiment one
Embodiment one
Fig. 1 be the embodiment of the present invention one provide rear power taking time the structural representation of control of engine speed structure.As shown in Figure 1, this control structure comprises:
ECU11 and rear power taking switch 12, wherein, ECU comprises first interface 111 and the second interface 112, and rear power taking switch 12 comprises the first contact 122, contact 121, second, the 3rd contact 123, the 4th contact 124 and preset resistance R0;
Described preset resistance R0 is arranged on the circuit at described 3rd place, contact 123;
Described first contact 121 can power supply (not shown in figure 1) be connected with one, this can power supply can for providing the electric power storage electric screen of 24V voltage.
Described first interface 111 connects described second contact 122;
Described 4th contact 124 is for connecting rear power takeoff (not shown in figure 1);
Described second interface 112 connects described 3rd contact 123.
It should be noted that, in embodiments of the present invention, first interface 111 and the second interface 112 can be stitch interface.As a specific embodiment of the present invention, the resistance of preset resistance R0 is 191.8k Ω.
When pressing rear power taking switch, when described rear power taking switch 12 is in closed state, described first contact 121 is communicated with described 4th contact 124.So, electric energy can be provided for rear power takeoff by the first contact 121 and the 4th contact 124 by power supply, for starting described rear power takeoff, now power taking work after gearbox.
Power taking switch 12 after pressing, when described rear power taking switch 12 is in closed state, second contact 122 is communicated with described 3rd contact, and so, the first interface 111 of ECU11 links together through second interface 112 of the second contact 122 and preset resistance R0 and the 3rd contact 123 and ECU11.So, ECU can control engine speed during rear power taking, and as shown in Figure 2, it comprises the following steps the schematic flow sheet of this controlling method:
S201, ECU obtain the resistance value of preset resistance:
The circuit be made up of first interface 111, second contact 122, preset resistance R0, the 3rd contact 123 and the second interface 112, ECU11 can obtain the resistance value of preset resistance.
S202, ECU obtain the voltage status corresponding with the resistance value of described preset resistance according to the resistance value of described preset resistance by the logical function demarcation of self.
S203, ECU voltage status corresponding according to the resistance value of described and described preset resistance limit motor under this voltage status maximum speed, the maximum speed of motor during rear power taking is made to be no more than rotary speed threshold value, thus the rotating speed of motor during rear power taking is controlled in safety range, and then the Security of power taking after ensureing:
It should be noted that, the rotary speed threshold value described in the embodiment of the present invention is got by the working experience of staff.Such as, when the maximum speed of motor is 2500rmp, when the rotating speed of the motor of rear power taking is more than 1500rmp, may will there is potential safety hazard.So now, rotary speed threshold value can be 1500rmp.When rear power taking, when the rotating speed of motor exceedes this rotary speed threshold value, the danger of rear power taking can be increased.And when rear power taking, the maximum speed of motor is no more than this rotary speed threshold value, the Security of power taking after just ensureing.
In addition, during due to rear power taking, the rotating speed of motor reaches the power demand that certain rotating speed can meet rear power taking, and without the need to reaching the very high rotating speed of motor self, so the maximum speed of the motor after controlling during power taking is also conducive to the waste avoiding the energy.
In addition, when rear power takeoff switch 12 is in off state, after gearbox, power taking does not work, and other all functions of motor recover normal, and now the rotating speed of motor is no longer by the restriction of engine peak speed during rear power taking.
It should be noted that, the control of engine speed structure when controlling method of engine speed is the rear power taking provided by the embodiment of the present invention during power taking after in above-described embodiment realizes.This control procedure is realized automatically by this control structure, avoids the method being controlled engine speed in prior art by the method for driver's foot throttle.Therefore control structure provided by the invention and controlling method avoid the impact that in prior art, driver skill difference controls rotating speed, and the method can control engine speed during rear power taking more exactly.
And the logical operation function of ECU in the control structure to be provided by the embodiment of the present invention can according to demarcating the voltage status corresponding with the resistance value of its acquisition, the rotating speed limit value of the motor after then limiting according to this voltage status during power taking, the maximum speed of the motor namely after restriction during power taking, therefore, the maximum speed of motor when the method can limit rear power taking, can ensure the Security of rear power taking.
Control of engine speed structure during the rear power taking provided for the embodiment of the present invention one above and the embodiment of controlling method thereof.
It should be noted that, in heavy vehicle, be generally all configured with many small power oil switch, utilize this many small power oil switch, ECU can to the restriction of Engine torque and rotating speed.In current technology, ECU can utilize many small power oil switch to heavy duty, in carry and engine speed in unloaded three kinds of situations and moment of torsion control.
Fig. 3 is many small power oil switch principle schematic.As shown in Figure 3, be provided with the resistance of four series connection in the oil switch of many small power, the resistance of these four series connection respectively is the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4.
Wherein, between the first resistance R1 and the second resistance R2, draw A contact, between the second resistance R2 and the 3rd resistance R3, draw B contact, between the 3rd resistance R3 and the 4th resistance R4, draw C contact, draw D contact in the back of the 4th resistance R4.
When the knob of many small power oil switch is in A, B, C, D diverse location, the resistance value of many small power oil switch that ECU receives is also different, ECU to be demarcated by the logical function of self according to its resistance value received and obtains 4 kinds of different voltage status, then, ECU realizes to Engine torque and rotating speed according to the difference of voltage status restriction.Therefore, utilize the many small power oil switch shown in Fig. 3, ECU can demarcate 4 kinds of different Engine torques and rotating speed limit value.
But as previously mentioned, current ECU utilize many small power oil switch to heavy duty, in carry and engine speed in unloaded three kinds of situations and moment of torsion control.That is, at present, many small power oil switch of vehicle configuration can realize three kinds of voltage status, and generally, adopt the voltage status that A, B, D contact is corresponding, so, in the present case, contact C is idle more.But ECU can voltage status corresponding to contact C limit the rotating speed of motor and moment of torsion.So, in order to retain the validity of 3 kinds of voltage status of the many small power oil switch in normal vehicle operation, and power taking switch after additionally not increasing, the control of engine speed structure when embodiment of the present invention additionally provides power taking after another and controlling method thereof.Specifically see embodiment two.
Embodiment two
Fig. 4 be the embodiment of the present invention two provide rear power taking time the structural representation of control of engine speed structure.It should be noted that, control of engine speed structure during rear power taking shown in Fig. 4 is except comprising all parts of the control structure in embodiment one, and the annexation of the annexation of all parts corresponding component a kind of with embodiment is identical.
Particularly, control of engine speed structure during rear power taking shown in Fig. 4 comprises ECU41 and rear power taking switch 42, wherein, ECU41 comprises first interface 411 and the second interface 412, and rear power taking switch 42 comprises the first contact 422, contact 421, second, the 3rd contact 423, the 4th contact 424 and preset resistance R0 '.
Described preset resistance R0 ' is arranged on the circuit at described 3rd place, contact 423;
Described first contact 421 can be connected by power supply (not shown in Fig. 4) with one, this can power supply can for providing the electric power storage electric screen of 24V voltage.
Described first interface 411 connects described second contact 422;
Described 4th contact 424 is for connecting rear power takeoff (not shown in Fig. 4);
Described second interface 412 connects described 3rd contact 423.
When pressing rear power taking switch 42, when described rear power taking switch 42 is in closed state, described first contact 421 is communicated with described 4th contact 422, contact 424, second and is communicated with described 3rd contact 423.
In addition, the control structure shown in Fig. 4 also comprises following structure:
Many small power oil switch 43; Wherein, rear power taking switch can also comprise the 5th contact 425;
Wherein, described second interface 412 connects one end of described many small power oil switch 43, and the other end of described many small power oil switch connects described 5th contact 425.
It should be noted that, the many small power oil switch 43 described in the embodiment of the present invention can adopt the many small power oil switch structure shown in Fig. 3.
In embodiments of the present invention, the resistance value that the resistance value of preset resistance R0 ' can be corresponding with the C contact in many small power oil switch 43 is identical.
When the rear power taking that the embodiment of the present invention provides engine speed control structure in, the second contact 422 can be communicated with the 5th contact 425 with the 3rd contact 423.Wherein, when pressing rear power taking switch, when rear power taking switch is in closed state, the second contact 422 is communicated with the 3rd contact 421, contact 423, first and is communicated with described 4th contact 424, now power taking work after gearbox.Further, ECU controls engine speed during rear power taking, and this controlling method is identical with the controlling method described in above-described embodiment one, for the sake of brevity, is not described in detail at this, and details refer to the corresponding description of embodiment one.
When not according to after power taking switch, when rear power taking switch is in off state, the second contact 422 is communicated with the 5th contact, contact 425, first 421 and disconnects with described 4th contact 424, and now, after gearbox, power taking does not work, and vehicle is in normal travelling state.Now, ECU can utilize many small power oil switch to vehicle heavy duty, in carry or the engine speed of light car conditions and moment of torsion control.Shown in concrete controlling method figure Fig. 5.It comprises the following steps:
S501, ECU obtain the resistance value of many small power oil switch:
As mentioned above, knob is in the different contact position places in the oil switch of many small power, and the resistance value of many small power oil switch is just different, so the resistance value of many small power oil switch that ECU obtains is just different.
S502, ECU obtain the voltage status corresponding with the resistance value in the oil switch of described many small power according to the resistance value in the oil switch of described many small power by the logical function demarcation of self.
S503, ECU voltage status corresponding according to the resistance value in the oil switch of described and described many small power limits the rotating speed of motor under this voltage status and moment of torsion, thus realize to vehicle heavy duty, in carry or underloading time engine speed and the restriction of moment of torsion.
Control of engine speed structure during the rear power taking provided for the embodiment of the present invention two above and the embodiment of controlling method thereof.This mode of execution, except having the beneficial effect described in embodiment one, also retains the validity of the many small power oil switch in normal vehicle operation, and has the rear power taking switch of extra increase.
In addition, in order to improve Security further, as shown in Figure 4, can further include in the rear power taking switch 42 in the control of engine speed structure when the rear power taking described in above-described embodiment two: the 6th contact 426 being in vacant state; When rear power taking switch disconnects, when namely after gearbox, power taking does not work, the first contact 421 is communicated with described 6th contact 426.
Control of engine speed structure during the rear power taking provided for the embodiment of the present invention above and the embodiment of controlling method thereof.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (6)
1. the control of engine speed structure after during power taking, is characterized in that, comprising:
ECU and rear power taking switch, described ECU comprises first interface and the second interface, and described rear power taking switch comprises the first contact, the second contact, the 3rd contact, the 4th contact and preset resistance; Described preset resistance arranges on the circuit at described 3rd place, contact;
Described first contact with can be connected by power supply;
Described first interface connects described second contact;
Described 4th contact is for connecting rear power takeoff;
Described second interface connects described 3rd contact;
When described rear power taking switch is in closed state, described second contact is communicated with described 3rd contact, and described first contact is communicated with described 4th contact.
2. structure according to claim 1, is characterized in that, described structure also comprises many small power oil switch, and described rear power taking switch also comprises the 5th contact;
Described second interface connects one end of described many small power oil switch, and the other end of described many small power oil switch connects described 5th contact;
When described rear power taking switch disconnects, described second contact is communicated with described 5th contact, and described first contact and described 4th contact disconnect.
3. structure according to claim 1 and 2, is characterized in that, described rear power taking switch also comprises: the 6th contact being in vacant state; When described rear power taking switch disconnects, described first contact is communicated with described 6th contact.
4. structure according to claim 2, is characterized in that, described many small power oil switch comprises: first resistance of connecting successively, the second resistance, the 3rd resistance and the 4th resistance;
Wherein, between the first resistance and the second resistance, draw A contact, between the second resistance and the 3rd resistance, draw B contact, between the 3rd resistance and the 4th resistance, draw C contact, draw D contact in the back of the 4th resistance;
Wherein, described second interface is connected with described first resistance; When described rear power taking switch closes, described 3rd contact is connected with described 4th resistance.
5. the control method for engine speed after during power taking, is characterized in that, described method adopts the structure described in any one of claim 1-4, and described method comprises:
When motor carries out rear power taking, ECU obtains the resistance value of described preset resistance;
ECU obtains the voltage status corresponding with the resistance value of described preset resistance according to the resistance value of described preset resistance by the logical function demarcation of self;
The ECU voltage status corresponding according to the resistance value of described and described preset resistance limits the maximum speed of motor under the voltage status that the resistance value of described and described preset resistance is corresponding, makes the maximum speed of motor during rear power taking be no more than rotary speed threshold value.
6. method according to claim 5, is characterized in that, described method adopts structure according to claim 4, and described method also comprises:
When described rear power taking switch disconnects, described ECU obtains the resistance value in the oil switch of many small power;
ECU obtains the voltage status corresponding with the resistance value in the oil switch of described many small power according to the resistance value in the oil switch of described many small power by the logical function demarcation of self;
ECU limit under the corresponding voltage status of the resistance value of motor in the oil switch of described and described many small power rotating speed and moment of torsion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510766891.6A CN105275642B (en) | 2015-11-11 | 2015-11-11 | Control of engine speed structure and its control method after a kind of when power taking |
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| CN201510766891.6A CN105275642B (en) | 2015-11-11 | 2015-11-11 | Control of engine speed structure and its control method after a kind of when power taking |
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| CN105275642A true CN105275642A (en) | 2016-01-27 |
| CN105275642B CN105275642B (en) | 2018-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110843758A (en) * | 2019-11-14 | 2020-02-28 | 陕西重型汽车有限公司 | Method and system for controlling power take-off constant rotating speed of automobile transfer case equipped with automatic transmission |
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