CN102407845A

CN102407845A - Method for reducing vibration of hybrid electric vehicle in acceleration and deceleration

Info

Publication number: CN102407845A
Application number: CN2011103342685A
Authority: CN
Inventors: 王奇; 陆中华
Original assignee: SUZHOU HAIGE NEW ENERGY AUTO ELECTRIC CONTROL SYSTEM TECHNOLOGY Co Ltd
Current assignee: SUZHOU HAIGE NEW ENERGY AUTO ELECTRIC CONTROL SYSTEM TECHNOLOGY Co Ltd
Priority date: 2011-10-29
Filing date: 2011-10-29
Publication date: 2012-04-11

Abstract

The invention discloses a method for reducing vibration of a hybrid electric vehicle in acceleration and deceleration. The method comprises the following steps that: 1) filtration is judged according to an enable signal, wherein if the torque changes over a certain time, the filtration is started; and if the changed torque is less than a certain value, the filtration is over; and 2) when a recovery end signal is 'true', the output of a low-pass filtering unit comes from an initial value, and an input value can not be output; and when the enable signal is 'true', the input value enters the low-pass filtering unit for the calculation of low-pass filtration. In the invention, a static torque is used as an input condition of a controller, the change of the torque is used as a basis of judging whether the vehicle enters an acceleration or deceleration state, and an ideal dynamic torque is obtained through a series of algorithms such as integration or filtration, thus the vibration felt by a driver stepping on or releasing an accelerator.

Description

The method of the shake sense when reducing hybrid vehicle acceleration and deceleration

Technical field

The present invention relates to a kind of electronic control system of hybrid vehicle, particularly a kind ofly reduce that hybrid vehicle quickens and the method for the shake sense when slowing down.

Background technology

Hybrid vehicle is meant two above propulsions source are housed on the car: the generator set of storage battery, fuel cell, solar cell, diesel locomotive, current hybrid vehicle generally is meant the diesel locomotive electrical generator, adds the automobile of storage battery.

At present domestic hybrid vehicle is in the starting stage, to various control methods just under study for action, mostly for there not being torque control, perhaps having torque control and but handles the driving problem less than algorithm preferably.When driving, step on the accelerator and pine tar door all can cause car body that the shake sense is arranged, and when engage a gear, also have the shake sense, and these are all owing to the moment of torsion sudden change causes.

Summary of the invention

The present invention solves the existing in prior technology technical matters, reaches desirable dynamic torque thereby provide a kind of through algorithm, thereby eliminates the method for the shake sense of driving step on the accelerator and pine tar door.

Above-mentioned technical matters of the present invention mainly is able to solve through following technical proposals: a kind ofly reduce that hybrid vehicle quickens and the method for the shake sense when slowing down, comprise following steps:

1) judge whether to carry out filtering according to enable signal (en), confirm that filtering begins if the variation of moment of torsion surpasses certain hour, when the moment of torsion of variation was worth less than certain, filtering finished;

2) when reset terminal signal (reset) be that " very " is (true) time; The output of low-pass filter unit (lowpass) is to come from initial value (iv); Input value (in) value is not exported; When enable signal (en) is " very " (true) time, input value (in) gets in the low-pass filter unit (lowpass), carries out the calculating of LPF.

Owing to of the present inventionly reduce that hybrid vehicle quickens and the method for the shake sense when slowing down changes simple in the orthodox method and carries out searching of moment of torsion according to the mode of tabling look-up; But according to the initial conditions of static torque as controller, the rate of change of its moment of torsion is as the sign that judges whether to get into acceleration and deceleration regime.Through a series of algorithm such as integration or filter and reach desirable dynamic torque, thereby eliminate the shake sense of driving step on the accelerator and pine tar door.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 reduces that hybrid vehicle quickens and the principle model scheme drawing of the method for shake sense when slowing down for of the present invention;

Fig. 2 is the inner structure scheme drawing of the low-pass filter unit of the principle model scheme drawing among Fig. 1;

Fig. 3 is the structural representation of the core of the low-pass filter unit among Fig. 2;

Fig. 4 is the experimental result diagram of curves of principle model when quickening among Fig. 1;

Fig. 5 is the experimental result diagram of curves of principle model when slowing down among Fig. 1.

The specific embodiment

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are set forth in detail, thereby protection scope of the present invention is made more explicit defining so that advantage of the present invention and characteristic can be easier to it will be appreciated by those skilled in the art that.

The invention provides and a kind ofly reach desirable dynamic torque, thereby eliminate the method for the shake sense of driving step on the accelerator and pine tar door through algorithm.

As depicted in figs. 1 and 2, LPF is the method for calculating of a LPF, and purpose is to postpone, and its result can see in Fig. 3 and Fig. 4.Tabling look-up part in the model is according to calculating in the sampling period, and the amount of change in torque need to confirm the time of delay.

Specify as follows: filter signal (filter_signal) is an analog signal of calculating; Its simulation be the condition that lets this module enable: when the accelerator open degree of driving engine surpasses certain limit, the speed of a motor vehicle is not hung neutral greater than the idling road speed; Do not occur quickening; And be not difference in torque from the torque rating of this model output and input (in) greater than certain value the time, begin to enable calculating, promptly Enable Pin (En) is input as 1; Relation between this signal be entirely " with " (and), recover the signal and the just negate of Enable Pin (En) of (Reset).Pedaling torque (Torque_pedal) is the desired signal of simulation pedal, and torque filter device (torque_filter) is a module that receives result of calculation, and the experimental result of back can show.

Fig. 2 is the inner structure of low-pass filter (Lowpass), and its algorithm is to come from core (core) part.

Fig. 3 is core (core) part, and this is the computing formula of low-pass filter (Lowpass): Reset=true, Lowpass=Iv then, and during Reset=false, Lowpass (k)=Lowpass (k-1)+[In-Lowpass (k-1)] * dT/T

Step:

1. en: when enable signal determines whether carrying out filtering according to the judgement of some conditions (this condition is explained) in filter_signal; As change in torque occurs and surpass certain hour and confirm that filtering begins; When the moment of torsion that changes was worth less than certain, filtering finished;

2. reset: the signal of this input and the just negate of the signal of en;

3. iv representes initial value, and in representes input, and when reset was true, the output of lowpass was to come from the iv value, and the in value is never come by output.When en was true, in got among the lowpass, carries out the calculating of LPF.

4. the T filtration time is by the difference decision of pedaling torque output one-period, and difference is big more, and filtration time is long more; This value will be demarcated, confirm according to the shake sense of vehicle, if like Fig. 1 current moment of torsion shown in a) with last time difference in torque was excessive; The T value will be big more so; Difference in torque is more little, and the T value is just little, and the curve among the map of back can embody.

5. dT is each time gap that calculates, and is 0.01s according to confirming the computing time of system, having defined computation period in this system, and promptly 10ms calculates once.

6. in case can to carry out that filtering calculates be that En is true to module, output valve is exactly a filter value; If the value of Reset is true, output valve is the iv value so.

Like Fig. 4 and shown in Figure 5, the skew lines among the result of test is the value of pedaling torque torque_pedal, and near the curve of the skew lines torque rating that should export for obtaining through this computing module of low-pass filter (lowpass).

Below only with an embodiment mentality of designing of the present invention is described, under the situation that system allows, the present invention can expand to external more function module simultaneously, thereby expands its function to greatest extent.

The above is merely the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any variation or replacement of expecting without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.

Claims

1. one kind reduces that hybrid vehicle quickens and the method for the shake sense when slowing down; Comprise following steps: 1) judge whether to carry out filtering according to enable signal (en); Confirm that filtering begins if the variation of moment of torsion surpasses certain hour, when the moment of torsion of variation was worth less than certain, filtering finished; 2) when reset terminal signal (reset) be that " very " is (true) time; The output of low-pass filter unit (lowpass) is to come from initial value (iv); Input value (in) value is not exported; When enable signal (en) is " very " (true) time, input value (in) gets in the low-pass filter unit (lowpass), carries out the calculating of LPF.