CN107627864B - A kind of power distribution method and control system of extended-range vehicle - Google Patents

Abstract

The invention provides a power distribution method and a control system of an extended-range vehicle, and relates to the technical field of electric vehicles. The power allocation method of the present invention is used to set the corresponding relationship between engine speed and power to obtain multiple power response strategies when the range-extended vehicle has an energy request for the range-extender; obtain vehicle operating conditions according to the real-time status of the vehicle ; Select different power response strategies according to the working conditions. The power response strategy includes multi-power point response strategy and power following response strategy. The invention provides a power distribution control system of an extended-range vehicle, which includes a setting unit, an acquiring unit and a selecting unit. The power allocation method and control system of the range-extending vehicle of the present invention can flexibly select one of the multi-power point response strategy and the power following response strategy according to the different working conditions of the vehicle, so that the range-extending vehicle using this method is more flexible , It is more adaptable to the new and increases the contribution of the vehicle to the economy.

Description

A power distribution method and control system for an extended-range vehicle

technical field

The invention relates to the technical field of electric vehicles, in particular to a power distribution method and a control system for an extended-range vehicle.

Background technique

With the advancement of technology in the field of electric vehicles, in order to solve the problem of short mileage of existing electric vehicles, extended-range electric vehicles have emerged as the times require. A range-extended electric vehicle is an electric vehicle equipped with an online rechargeable power battery and a range extender. The mileage of electric vehicles is greatly increased, and the problem of short mileage of pure electric vehicles is improved. Existing range-extended electric vehicles use a single response control strategy under different working conditions, which makes the fuel economy of extended-range electric vehicles poor.

Contents of the invention

An object of the present invention is to provide a method for power distribution of extended-range vehicles with flexible selection.

Another object of the present invention is to provide a control system for applying the power distribution method of the extended-range vehicle.

In particular, the present invention provides a power distribution method for a range-extended vehicle, which is suitable for when the range-extended vehicle has an energy request for the range extender, including:

Set the corresponding relationship between engine speed and power, and get a variety of power response strategies through calculation and verification;

Obtain the working conditions of the vehicle according to the real-time condition of the vehicle;

Control and select different power response strategies according to the working conditions;

Wherein, the multiple power response strategies include:

Multiple Power Point Response Strategy, a response strategy developed for multiple single power points with lower specific fuel consumption; and

The power following response strategy is a response strategy formed for continuous power points with real-time response and feedback of low fuel consumption rate.

Further, in the multi-power point response strategy, the correspondence between the rotational speed and power is a plurality of discontinuous points when the fuel consumption rate is low;

In the power following response strategy, the corresponding relationship between the rotational speed and the power is a continuous curve when the fuel consumption rate is low.

Further, the operating condition includes a parking condition, wherein a multi-power point response strategy is selected under the parking condition.

Further, according to the parking condition, it is judged that there is a demand for fast charging of the power battery, and the power generation point with the best fuel economy and higher power in the multi-power point response strategy with the best comprehensive evaluation is selected.

Further, the working condition also includes a reverse working condition, wherein the multi-power point response strategy is selected under the reverse working condition.

Further, according to the reversing working condition, it is determined that the battery power is not enough to support the extended-range vehicle to complete the reversing function, and the lowest power point in the multi-power point response strategy that meets the low power requirement of reversing is selected.

Further, the working conditions also include the forward working condition, wherein the forward working condition includes the first forward working condition in which the power battery is used as the main source of energy demand, the range extender is used as the auxiliary energy source, and the range extender is used as the first forward working condition. The second forward working condition is the main source of energy demand, and the power battery is used as the auxiliary energy source.

Further, under the first forward working condition, the multi-power point response strategy is selected, and one of the power points is selected according to the energy demand of the vehicle to charge the power battery or work coupled with the power battery to meet the high power of the vehicle need.

Further, under the second forward working condition, the power following response strategy is selected to meet the power request of the whole vehicle in real time.

Further, the present invention also provides a control system applying a power distribution method of an extended-range vehicle, including:

The setting unit is used to obtain various power response strategies through calculation and verification according to the corresponding relationship between engine speed and power;

An acquisition unit, configured to acquire the working condition of the vehicle, including parking condition, reverse working condition and forward working condition;

A selection unit, configured to select different power response strategies according to different working conditions, so as to meet the requirements of different working conditions of the vehicle;

Wherein, the multiple power response strategies include:

Multiple Power Point Response Strategy, a response strategy developed for multiple single power points with lower specific fuel consumption; and

The power following response strategy is a response strategy formed for continuous power points with real-time response and feedback of low fuel consumption rate.

The power distribution method and control system of the range-extended vehicle of the present invention can flexibly select one of the multi-power point response strategy and the power following response strategy according to the different working conditions of the vehicle, so that the range-extended vehicle using the method It is more flexible, more adaptable, and increases the contribution of the extended-range vehicle to the economy.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

FIG. 1 is a schematic flow chart of a power distribution method for an extended-range vehicle according to an embodiment of the present invention;

FIG. 2 is a relationship diagram between power and rotational speed of a power following response strategy according to an embodiment of the present invention;

FIG. 3 is a logical schematic diagram of a power distribution method for an extended-range vehicle according to an embodiment of the present invention;

Fig. 4 is a schematic block diagram of a power distribution control system of an extended-range vehicle according to an embodiment of the present invention.

Detailed ways

Fig. 1 is a schematic flowchart of a power allocation method for an extended-range vehicle according to an embodiment of the present invention.

The present invention provides a power distribution method for an extended-range vehicle, which is used to include the following steps when the extended-range vehicle has an energy request for the range extender:

S10, setting the corresponding relationship between engine speed and power, and obtaining various power response strategies through calculation and verification;

S20, obtaining the working conditions of the vehicle according to the real-time condition of the vehicle;

S30, controlling and selecting different power response strategies according to the working conditions;

Wherein, the multiple power response strategies include:

Multiple Power Point Response Strategy, a response strategy developed for multiple single power points with lower specific fuel consumption; and

The power following response strategy is a response strategy formed for continuous power points with real-time response and feedback of low fuel consumption rate.

The power distribution method of the extended-range vehicle of the present invention can flexibly select one of the multi-power point response strategy and the power following response strategy according to the different working conditions of the vehicle. Therefore, compared with the prior art, only one The response strategy makes the range-extending vehicle of the present invention more flexible and adaptable, and increases the contribution of the range-extending vehicle to economy.

As a specific embodiment, in the multi-power point response strategy, the correspondence between the rotational speed and the power is a plurality of discontinuous points when the fuel consumption rate is low. The discontinuous points are all power points with better emission at the same time, and the multiple power points are defined as P0, P1...Pn.

Fig. 2 shows a relationship between power and rotational speed of a power following response strategy. In the power following response strategy, the corresponding relationship between the rotational speed and the power is a continuous curve when the fuel consumption rate is low. The continuous curve responds and feeds back power in real time according to the needs of the vehicle, and a curve from P0 to Pn is obtained through calculation and verification (as shown in Figure 2).

In general, the operating conditions of the vehicle generally include parking conditions, reversing conditions and forward conditions. In this embodiment, the control strategies selected for each working condition are slightly different.

As a specific embodiment, when the vehicle selects a multi-power point response strategy under the parking condition.

As a preference, in this embodiment, according to the parking conditions, it is judged that there is a demand for fast charging of the power battery, and the power generation point with the best fuel economy and relatively large power in the multi-power point response strategy is selected as the best comprehensive evaluation . This power generation point can be called the optimal power generation point. In a specific embodiment, if the optimal power generation point selected by the vehicle at this time is the P3 power generation point, because the engine speed needs a process to rise, in order to avoid jumping directly into the P3 power generation point after the range extender is turned on, avoid excessive speed fluctuations. large and affect the economical decline of the whole vehicle. Under this working condition, control the transition path of the range extender from P0->P1->P2->P3 until it reaches the optimal power generation point and stops. The optimal generating power point calculated in the rapid transition control system under the premise of ensuring the steady increase of the speed.

Further, when the vehicle is in the reverse condition, a multi-power point response strategy is selected.

Preferably, according to the reversing working conditions, it is determined that the battery power is not enough to support the extended-range vehicle to complete the reversing function, and the lowest power point in the multi-power point response strategy that meets the low power requirements of reversing is selected.

Further, the working conditions also include the forward working condition, wherein the forward working condition includes the first forward working condition in which the power battery is used as the main source of energy demand, the range extender is used as the auxiliary energy source, and the range extender is used as the first forward working condition. The second forward working condition is the main source of energy demand, and the power battery is used as the auxiliary energy source.

Further, under the first forward working condition, a multi-power point response strategy is selected, and one of the power points is selected from the n+1 points in P0 to Pn according to the energy demand of the vehicle, so as to charge the power battery or Coupled with the power battery to meet the high power demand of the vehicle.

Further, under the second forward working condition, a power following response strategy is selected to meet the power request of the whole vehicle in real time. That is, the actual energy demand value of the whole vehicle is matched in real time through the curve of P0-Pn.

Fig. 3 shows a logical diagram of the power distribution method of the range-extended vehicle under different working conditions according to the present invention. Specifically include:

Step D10, start the vehicle, start the control system, and the vehicle has an energy request for the range extender;

Step D20, judge whether the range extender is faulty, if yes, go to step D30, if not, go to step D40;

Step D30, judging whether power generation is allowed, if yes, enter step D40, if not, end and exit;

Step D40, judging whether the vehicle speed is 0, if it is, it means entering the parking condition, select the optimal power generation point control strategy in the multi-power point response strategy, and end after completing the action, if not, go to step D50;

Step D50, judging whether the vehicle speed direction is negative, if yes, enter the reverse operation mode, select the lowest power point control strategy among the multi-power point response strategies, and end after completing the action, if not, enter the forward operation mode, and enter step D60;

Step D60, judging whether the vehicle is a power battery as the main energy source, if yes, select the multi-power point response strategy, and end after completing the action, if not, it means that the extended range is the main source of normal energy demand, select the power follow-dependence strategy, and complete Action ends.

Fig. 4 shows a schematic block diagram of a power distribution control system of a range-extended vehicle according to an embodiment of the present invention.

As shown in FIG. 4 , the power distribution control system of the extended-range vehicle of the present invention includes a setting unit 10 , an acquiring unit 20 and a selecting unit 30 .

Wherein, the setting unit 10 is used to obtain various power response strategies through calculation and verification according to the corresponding relationship between engine speed and power;

An acquisition unit 20, configured to acquire the operating conditions of the vehicle, the operating conditions including parking conditions, reverse operating conditions and forward operating conditions;

A selection unit 30, configured to select different power response strategies according to different working conditions, so as to meet the requirements of different working conditions of the vehicle;

Wherein, the multiple power response strategies include:

Multiple Power Point Response Strategy, a response strategy developed for multiple single power points with lower specific fuel consumption; and

The power following response strategy is a response strategy formed for continuous power points with real-time response and feedback of low fuel consumption rate.

The power distribution control system of the extended-range vehicle of the present invention can flexibly select one of the multi-power point response strategy and the power following response strategy according to the different working conditions of the vehicle. Therefore, compared with the prior art, it can only use A response strategy makes the range-extending vehicle of the present invention more flexible and adaptable, and increases the contribution of the range-extending vehicle to economy.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (8)

1. A power distribution method for a range-extender vehicle, suitable for when the range-extender vehicle has an energy request to the range extender, comprising: Set the corresponding relationship between engine speed and power, and get a variety of power response strategies through calculation and verification; Obtain the working conditions of the vehicle according to the real-time condition of the vehicle; Control and select different power response strategies according to the working conditions; Wherein, the multiple power response strategies include: Multiple Power Point Response Strategy, a response strategy developed for multiple single power points with lower specific fuel consumption; and Power following response strategy, a response strategy formed for real-time response and feedback of continuous power points with low fuel consumption rate; The operating condition includes a parking condition, wherein the multi-power point response strategy is selected under the parking condition; According to the parking conditions, it is judged that there is a demand for fast charging of the power battery, and the power point of the multi-power point response strategy with the best fuel economy and the best comprehensive evaluation of the larger power is selected. 2. The power distribution method according to claim 1, characterized in that, In the multi-power point response strategy, the corresponding relationship between the rotational speed and power is a plurality of discontinuous points when the fuel consumption rate is low; In the power following response strategy, the corresponding relationship between the rotational speed and the power is a continuous curve when the fuel consumption rate is low. 3. The power allocation method according to any one of claims 1-2, characterized in that, The operating condition also includes a reverse operating condition, wherein the multi-power point response strategy is selected under the reverse operating condition. 4. The power distribution method according to claim 3, characterized in that, According to the reversing working conditions, it is determined that the battery power is not enough to support the extended-range vehicle to complete the reversing function, and the lowest power point in the multi-power point response strategy that meets the low power requirements of reversing is selected. 5. The power allocation method according to any one of claims 1-2 or 4, characterized in that, The working conditions also include the forward working condition, wherein the forward working condition includes the first forward working condition in which the power battery is used as the main source of energy demand, the range extender is used as the auxiliary energy source, and the range extender is used as the main source of energy demand. source, power battery as the second forward working condition of the auxiliary energy source. 6. The power distribution method according to claim 5, characterized in that, Under the first forward working condition, select the multi-power point response strategy, and select one of the power points according to the energy demand of the vehicle to charge the power battery or work coupled with the power battery to meet the high power demand of the vehicle. 7. The power distribution method according to claim 5, characterized in that, Under the second forward working condition, the power following response strategy is selected to meet the power request of the whole vehicle in real time. 8. A control system applying the power distribution method of the range-extended vehicle according to any one of claims 1-7, comprising: The setting unit is used to obtain various power response strategies through calculation and verification according to the corresponding relationship between engine speed and power; An acquisition unit, configured to acquire the working condition of the vehicle, including parking condition, reverse working condition and forward working condition; A selection unit, configured to select different power response strategies according to different working conditions, so as to meet the requirements of different working conditions of the vehicle; Wherein, the multiple power response strategies include: Multiple Power Point Response Strategy, a response strategy developed for multiple single power points with lower specific fuel consumption; and The power following response strategy is a response strategy formed for continuous power points with real-time response and feedback of low fuel consumption rate.