CN102182822B - Gear shift prompting equipment and method - Google Patents

Abstract

The invention discloses a shift prompt device and method. The gear shift prompting device of the present invention may include: an information collection device configured to collect vehicle operating information; an optimal rotational speed determination device connected to the information collection device and configured to determine the optimal rotational speed of the engine according to the vehicle operating information; The optimal gear determining device is connected with the optimal rotational speed determining device and is configured to determine the optimal gear of the vehicle's gearbox based on the optimal rotational speed; and the prompting device is connected with the optimal gear determining device and is configured to Prompt the user for the best gear.

Description

Shift prompt device and method

technical field

The invention relates to the technical field of diesel engines, in particular to a gear shift prompting device and method for diesel engines.

Background technique

During the use of the vehicle, the fuel consumption of the vehicle is an important issue. For a vehicle in the process of driving, the current common method is to determine the appropriate gear for the vehicle according to the driving speed of the vehicle in order to save fuel consumption. This generally requires the driver to have rich experience. Speed gear. In addition, there is currently a method of automatically calculating the appropriate gear through the control system according to the driving speed of the vehicle.

However, these existing methods do not consider various specific conditions of the vehicle during driving, such as vehicle operating information such as real-time engine speed, torque, universal characteristic curve, external characteristic curve, and optimal operating point curve of the engine. Therefore, the gear position obtained according to the existing method is not effectively related to the current driving condition of the vehicle, resulting in low accuracy of the gear position obtained in this way and low fuel economy of the vehicle.

Contents of the invention

In view of the above problems, an object of the present invention is to provide a gear shift prompting device and method, which can obtain the engine speed based on the actual running conditions of the vehicle, so as to determine the gearbox gear suitable for the current running conditions of the vehicle based on the engine speed, and provide The user is prompted so that the user can select a gear as required, thereby improving the fuel economy of the vehicle and saving fuel consumption.

According to the first aspect of the present invention, there is provided a gear shift prompting device, which may include: an information collection device configured to collect vehicle operating information; an optimal rotational speed determination device connected to the information collection device, It is configured to determine the optimal rotation speed of the engine according to the vehicle operation information; the optimal gear determination device is connected to the optimal rotation speed determination device and is configured to determine the optimal gear position of the vehicle's gearbox based on the optimal rotation speed; and prompting The device, connected with the optimal gear determination device, is configured to prompt the user for the optimal gear.

According to an embodiment of the present invention, the information collection device may include: a device for obtaining one or more of the following vehicle operating information: gearbox output shaft speed, engine speed, torque, vehicle speed, universal characteristic curve of the engine , External characteristic curve, best working point curve.

According to an embodiment of the present invention, the optimal rotational speed determination device may include: a calculation device for calculating the current power of the engine; and an acquisition device for obtaining the optimal rotational speed according to the current power according to the universal characteristic curve of the engine.

According to an embodiment of the present invention, the optimal rotation speed determination device may include: a calculation device for calculating the current power of the engine according to the vehicle operating information; a calculation device for calculating the ratio of the current torque of the engine to the maximum possible torque at the current rotation speed ; When the ratio is greater than or equal to a predetermined threshold, the current speed of the engine is determined as an optimal speed of determination; and when the ratio is less than a predetermined threshold, the update torque of the engine is determined according to the external characteristic curve of the engine and according to the current speed of the engine The power and updated torque means for obtaining an optimum rotational speed of the engine, wherein the ratio of the updated torque to the maximum possible torque is greater than or equal to a predetermined threshold.

According to an embodiment of the present invention, the optimal rotation speed determination device may include: an acquisition device for obtaining the acceleration of the vehicle; a comparison device for comparing the acceleration with an acceleration threshold; a calculation device for calculating the current power of the engine; Calculation means for calculating the ratio of the current torque of the engine to the maximum possible torque at the current speed; means for determining the current speed of the engine as the optimal speed when the ratio is greater than or equal to a predetermined threshold; It is a device for determining the updated torque of the engine according to the external characteristic curve of the engine and obtaining the optimal rotational speed of the engine according to the current power of the engine and the updated torque, wherein the ratio of the updated torque to the maximum possible torque is greater than or equal to a predetermined threshold.

According to an embodiment of the present invention, the device for determining the optimal gear position may include: a calculating device configured to calculate the ratio of the optimal rotational speed to the rotational speed of the output shaft of the gearbox; The configuration table is used to search the set of candidate gears of the gearbox according to the ratio; the obtaining device is configured to obtain the set of candidate speeds of the engine from the set of candidate gears of the gearbox according to the configuration table of gear ratio constants of the gearbox; the selection device is configured to configured to select a rotational speed from the set of candidate rotational speeds according to the optimal operating point curve of the engine; and the determining device is configured to determine a gear corresponding to the selected rotational speed in the set of candidate gears as the optimum gear .

According to an embodiment of the present invention, the selection means in the optimal gear determination means may include: a determination means for determining the candidate rotational speed closest to the optimum operating point curve of the engine in the candidate rotational speed set; Selection means for selecting the determined candidate rotational speed from the set of rotational speeds.

According to an embodiment of the present invention, the prompting device may include: a device for preferentially displaying the best gear in the information display.

According to the second aspect of the present invention, there is provided a shift prompt method, which may include the following steps: collecting vehicle operating information; determining the optimal engine speed according to the vehicle operating information; determining the vehicle's gearbox based on the optimal rotating speed the optimal gear; and prompting the user for the optimal gear.

According to an embodiment of the present invention, collecting vehicle operation information may include: obtaining one or more of the following: gearbox output shaft speed, engine speed, torque, vehicle speed, universal characteristic curve of the engine, external characteristic curve, maximum Optimum working point curve.

According to an embodiment of the present invention, determining the optimal rotational speed when the engine has optimal fuel economy according to the vehicle operation information may include: calculating the current power of the engine according to the vehicle operation information; get the optimum speed.

According to an embodiment of the present invention, determining the optimal engine speed when the engine has the best fuel economy according to the vehicle running information may include: calculating the current power of the engine according to the vehicle running information; calculating the current torque of the engine and the maximum possible torque at the current speed When the ratio is greater than or equal to the predetermined threshold, the current speed of the engine is determined as the optimal speed; and when the ratio is less than the predetermined threshold, the update torque of the engine is determined according to the external characteristic curve of the engine, and according to the current power of the engine and The updated torque results in an optimal rotational speed of the engine, wherein the ratio of the updated torque to the maximum possible torque is greater than or equal to a predetermined threshold.

According to an embodiment of the present invention, determining the optimal rotational speed when the engine has optimal fuel economy according to the vehicle running information may include: obtaining the acceleration of the vehicle; comparing the acceleration with the acceleration threshold, and if the acceleration is greater than the acceleration threshold, then calculating the current speed of the engine Power, calculate the ratio of the current torque of the engine to the maximum possible torque at the current speed, when the ratio is greater than or equal to a predetermined threshold, determine the current speed of the engine as the optimal speed, and when the ratio is less than the predetermined threshold, according to the external characteristics of the engine The curve determines the updated torque of the engine, and obtains the optimal rotational speed of the engine according to the current power of the engine and the updated torque, wherein the ratio of the updated torque to the maximum possible torque is greater than or equal to a predetermined threshold.

According to an embodiment of the present invention, determining the optimum gear position of the gearbox of the vehicle based on the optimum rotational speed may include: calculating the ratio of the optimum rotational speed to the rotational speed of the output shaft of the transmission; Find the candidate gear set of the gearbox by the ratio; according to the gear ratio constant configuration table of the gearbox, get the candidate speed set of the engine from the candidate gear set of the gearbox; according to the optimal operating point curve of the engine, select the Select a rotational speed; and determine the gear corresponding to the selected rotational speed in the set of candidate gears as the best gear.

According to an embodiment of the present invention, according to the optimal operating point curve of the engine, selecting a rotational speed from the candidate rotational speed set may include: determining the candidate rotational speed closest to the optimum operating point curve of the engine in the candidate rotational speed set; The determined candidate rotational speed is selected from the rotational speed set.

According to an embodiment of the present invention, prompting the user for the best gear may include: preferentially displaying the best gear on the information display.

By utilizing the gear shift prompting device in the embodiment of the present invention, the driver can be prompted in real time of the gearbox gear with the best fuel economy under the current vehicle operating conditions, and the driver can be prompted to shift gears, thereby achieving the purpose of reducing fuel consumption. In addition, the shift prompt device of the present invention has a simple structure and can be realized without adding any sensors on the basis of the original complete vehicle.

Other features and advantages of the invention will become apparent from the following description of preferred embodiments illustrating the principles of the invention, taken in conjunction with the accompanying drawings.

Description of drawings

Through the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other purposes and effects of the present invention will become clearer and easier to understand, wherein:

Fig. 1 is a schematic block diagram of a gear shift prompting device according to an embodiment of the present invention.

Fig. 2 is a flowchart of a gear shift prompting method according to an embodiment of the present invention.

Fig. 3 is a flow chart of a shift prompt method according to another embodiment of the present invention.

FIG. 4 is a schematic diagram of an engine external characteristic curve according to an embodiment of the present invention.

In all the above drawings, the same reference numerals indicate the same, similar or corresponding features or functions.

Detailed ways

The present invention will be explained and described in more detail below in conjunction with the accompanying drawings. It should be understood that the drawings and embodiments of the present invention are for exemplary purposes only, and are not intended to limit the protection scope of the present invention.

FIG. 1 is a schematic block diagram of a gear shift prompting device 100 according to an embodiment of the present invention. The gear shift prompting device 100 shown in FIG. 1 may include: an information collection device 110 , an optimal rotational speed determination device 120 , an optimal gear position determination device 130 , and a prompting device 140 .

The information collection device 110 may be configured to collect vehicle operation information. In one embodiment, the information collection device 110 may include: a device for obtaining one or more of the following: gearbox output shaft speed, engine speed, torque, vehicle speed, universal characteristic curve of the engine, external characteristic curve , Optimum working point curve.

The optimal rotational speed determination device 120 may be connected with the information collection device 110 and configured to determine the optimal rotational speed of the engine according to the vehicle operation information.

In one embodiment, the optimal rotational speed determining means 120 may include: means for calculating the current power of the engine; and means for obtaining the optimal rotational speed according to the current power according to the universal characteristic curve of the engine.

In another embodiment, the optimal rotational speed determining means 120 may include: means for calculating the current power of the engine according to the vehicle operating information; means for calculating the ratio of the current torque of the engine to the maximum possible torque at the current rotational speed; A device for determining the current rotational speed of the engine as the optimum rotational speed when the ratio is greater than or equal to a predetermined threshold; and for determining the update torque of the engine according to the external characteristic curve of the engine and according to the current power of the engine when the ratio is less than the predetermined threshold and an updated torque to obtain an optimal rotational speed of the engine, wherein the ratio of the updated torque to the maximum possible torque is greater than or equal to a predetermined threshold.

In yet another embodiment, the optimal rotational speed determination device 120 may include: a device for obtaining the acceleration of the vehicle; a device for comparing the acceleration with an acceleration threshold; a device for calculating the current power of the engine; means for the ratio of the current torque to the maximum possible torque at the current speed; means for determining the current speed of the engine as the optimum speed when the ratio is greater than or equal to a predetermined threshold; A device for determining the updated torque of the engine based on the external characteristic curve of the engine and obtaining the optimal rotational speed of the engine according to the current power of the engine and the updated torque, wherein the ratio of the updated torque to the maximum possible torque is greater than or equal to a predetermined threshold.

The optimal gear position determination device 130 may be connected with the optimal rotational speed determination device 120 and configured to determine the optimal gear position of the transmission of the vehicle based on the optimal rotational speed. In one embodiment, the optimal gear position determination device 130 may include: a calculation device configured to calculate the ratio of the optimal rotation speed to the transmission output shaft rotation speed; a search device configured to configure according to the transmission gear speed ratio constant The table is used to look up the candidate gear set of the gearbox according to the ratio; the obtaining device is configured to obtain the candidate speed set of the engine from the candidate gear set of the gearbox according to the gear ratio constant configuration table of the gearbox; the selection device is configured To select a rotational speed from the set of candidate rotational speeds according to the optimal operating point curve of the engine; and the determining device is configured to determine the gear corresponding to the selected rotational speed in the set of candidate gears as the optimum gear.

In one embodiment, the selection means of the optimal gear determination means 130 may include:

means for determining the candidate rotational speed closest to the optimal operating point curve of the engine in the set of candidate rotational speeds; and means for selecting the determined candidate rotational speed from the set of candidate rotational speeds.

The prompting device 140 may be connected with the optimal gear determining device 130 and configured to prompt the user for the optimal gear. In one embodiment, the prompting means 140 may include means for preferentially displaying the best gear in the information display.

It should be understood that the above-mentioned devices of the present invention may be realized by a combination of existing hardware, firmware, software, and machines. For example, each of the above-mentioned devices can be implemented by using commonly used or future application-specific integrated circuits, application-specific digital processors, programmable logic controllers (such as Field Programmable Gate Array FPGA, etc.) and the like.

Fig. 2 is a flowchart of a gear shift prompting method according to an embodiment of the present invention. The gear shift prompting method shown in FIG. 2 can be implemented by using the gear shift prompting device shown in FIG. 1 .

In step 201, vehicle operation information is collected.

This step can be completed by the information collection device 110 of the gear shift prompting device 100 shown in FIG. 1 , or by any other suitable device conceivable by those skilled in the art. In step 201, for example, vehicle operation information such as the output shaft speed of the gearbox, engine speed, torque, vehicle speed, universal characteristic curve, external characteristic curve, and optimal operating point curve of the vehicle may be collected.

In step 202, the optimal rotational speed of the engine is determined according to the vehicle operation information.

This step can be completed by the optimal rotation speed determining device 120 of the gear shift prompting device 100 shown in FIG. 1 , or by any other suitable device that can be imagined by those skilled in the art.

In one embodiment, the current power of the engine may be firstly calculated according to the vehicle operation information, and then the optimal rotational speed is obtained according to the current power according to the universal characteristic curve of the engine, so as to complete step 202 .

The universal characteristic curve of the engine usually refers to taking the engine speed as the abscissa and the average effective pressure or torque as the ordinate to draw together the load characteristic curve, speed characteristic curve, power and fuel consumption of the diesel engine at each speed. curve. From the universal characteristic curve, the torque, fuel consumption rate and other parameters of the diesel engine at different power states at each specific speed can be read out. From the universal characteristic curve, the best economic operation area of the diesel engine can be observed. The universal characteristic curve of the engine can be pre-stored in the ECU, for example. The vehicle running information may include, for example, the transmission output shaft speed, engine speed, torque, vehicle speed, universal characteristic curve of the engine, external characteristic curve, optimal operating point curve and other information. The current power of the engine can be obtained, for example, by multiplying the engine speed by the torque. After obtaining the current power of the engine, the optimal engine speed can be obtained by querying the optimal operating point curve in the universal characteristic curve. Fig. 4 schematically shows the optimal operating point curve of the engine. For example, when the optimal operating point curve is the curve when the engine has the best fuel economy, you can query the curve to get the optimal speed when the engine has the best fuel economy; when the optimal operating point curve is the engine with the best fuel economy When the curve is the best dynamic performance, the optimal rotational speed when the engine has the best dynamic performance can be obtained by querying the curve.

In the second embodiment, step 202 can be completed through the following process: first calculate the current power of the engine according to the vehicle running information; then calculate the ratio of the current torque of the engine to the maximum possible torque at the current speed; when the ratio is greater than or equal to the predetermined When the threshold is reached, the current rotational speed of the engine is determined as the optimal rotational speed; and, when the ratio is less than the predetermined threshold, the updated torque of the engine is determined according to the external characteristic curve of the engine, and the optimal rotational speed of the engine is obtained according to the current power of the engine and the updated torque , wherein the ratio of the updated torque to the maximum possible torque is greater than or equal to a predetermined threshold. This embodiment will be described in detail below with reference to FIG. 3 . The external characteristic curve of the engine usually refers to the engine speed characteristic curve measured under the condition that the engine emits the maximum power under the best working condition of the engine.

In a third embodiment, step 202 can be accomplished through the following process: first obtain the acceleration of the vehicle; compare the obtained acceleration with a preset acceleration threshold, and if the acceleration is greater than the acceleration threshold, then the rest of the processing will be compared with the second acceleration threshold. The embodiments are similar: for example, it is possible to calculate the current power of the engine, calculate the ratio of the current torque of the engine to the maximum possible torque at the current speed, determine the current speed of the engine as the optimal speed when the ratio is greater than or equal to a predetermined threshold, and determine the current speed of the engine as the optimal speed when the ratio is less than When the predetermined threshold is determined, the updated torque of the engine is determined according to the external characteristic curve of the engine, and the optimal rotational speed of the engine is obtained according to the current power of the engine and the updated torque, wherein the ratio of the updated torque to the maximum possible torque is greater than or equal to the predetermined threshold.

In step 203, based on the optimal rotational speed, the optimal gear position of the gearbox of the vehicle is determined.

This step can be completed by the optimal gear determination device 130 of the gear shift prompting device 100 shown in FIG. 1 , or by any other suitable device that can be imagined by those skilled in the art.

In one embodiment, the ratio of the optimal rotational speed to the output shaft rotational speed of the transmission can be calculated first; according to the configuration table of transmission gear ratio constants, the set of candidate gears of the transmission can be searched according to the ratio; according to the gear ratio of the transmission The constant configuration table obtains the candidate speed set of the engine from the candidate gear set of the gearbox; selects a speed from the candidate speed set according to the optimal operating point curve of the engine; and combines the candidate gear set with the selected The gear corresponding to the rotational speed is determined as the best gear, thus step 203 is completed.

In another embodiment, the process of implementing step 203, in addition to performing the steps of the above-mentioned embodiments, can also first determine the candidate rotational speed during the process of selecting a rotational speed from the set of candidate rotational speeds according to the optimum operating point curve of the engine The candidate rotational speed closest to the optimal operating point curve of the engine in the set is selected, and then the determined candidate rotational speed is selected from the set of candidate rotational speeds. This embodiment will be described in detail below with reference to FIG. 3 .

In step 204, the best gear is prompted to the user.

This step can be accomplished by the prompting device 140 of the shift prompting device 100 shown in FIG. 1 , or by any other suitable device that can be imagined by those skilled in the art.

In step 204, for example, the optimal gear can be preferentially displayed in the information display, so that the user can quickly know which gear is the optimal gear of the current vehicle, so that the user can change the gear, thereby saving fuel, reducing the fuel consumption. The information display can have various forms. For example, the information display can be: LCD, VFD, OLED, etc. For example, the information display can be a flat display or a head-up display.

Then, the flow in Fig. 2 ends.

Fig. 3 is a flow chart of a shift prompt method according to another embodiment of the present invention. The embodiment shown in FIG. 3 is a specific implementation of the gear shift prompt method of the present invention, and those skilled in the art should fully understand that the embodiment in FIG. 3 is only exemplary and not limiting for the present invention. The gear shift prompt method and device of the present invention are not limited to the specific examples given in this specification, but may include any implementation manners that can be imagined by those skilled in the art according to the present invention.

In step 301, vehicle operation information is collected.

As mentioned above, the vehicle running information in the present invention may include, for example, transmission output shaft speed, engine speed, torque, vehicle speed, universal characteristic curve of the engine, external characteristic curve, optimal operating point curve and other information.

In step 302, the current power of the engine is calculated according to the vehicle operation information.

According to the vehicle running information obtained in step 301, the current speed and torque of the engine can be obtained, so that the current power of the engine can be obtained by multiplying the current speed of the engine and the current torque. Those skilled in the art can also obtain the current power of the engine according to other known technical means commonly used in the art, without being limited to the specific implementation manners disclosed in the present invention.

In this embodiment, the current torque of the engine is denoted as M _C , and the current rotational speed is denoted as n _C , the current output power of the engine can be obtained as:

P _C =M _C ×n _C (1)

In step 303, the torque ratio between the current torque of the engine and the maximum possible torque at the current rotational speed is calculated.

Torque generally refers to the amount of force that the engine drives the drive shaft to rotate. Generally, under the condition of fixed power, the torque is inversely proportional to the engine speed, the faster the speed, the smaller the torque, and the slower the speed, the greater the torque.

The maximum possible torque at the current rotational speed can be obtained, for example, from the universal characteristic curve of the engine. In this embodiment, the maximum possible torque of the engine at the current speed is marked as M _Cmax , and the ratio of the current torque of the engine to the maximum possible torque at the current speed is marked as R _M , then

R _M =M _C /M _Cmax (2)

In step 304, it is determined whether the torque ratio obtained from step 303 is less than a predetermined threshold.

The predetermined threshold for the ratio can be obtained in various ways, for example, it can be pre-specified according to empirical values, obtained according to the current technology, calculated according to a mathematical model, or an appropriate preset value that can be realized by those skilled in the art.

In one embodiment, the predetermined threshold may be 60%, for example. Now the ratio R _M obtained from step 303 can be compared with a predetermined threshold, if the ratio R _M is less than the predetermined threshold, then proceed to step 305; if the ratio R _M is not less than (that is, greater than or equal to) the predetermined threshold, then proceed to Go to step 306.

In step 305, the updated torque of the engine is determined according to the external characteristic curve of the engine, and the optimal rotational speed of the engine is obtained according to the current power of the engine and the updated torque.

When the torque ratio R _M obtained from step 303 is smaller than the predetermined threshold, enter this step from step 304, which means that the current engine load rate is low and the engine speed needs to be reduced. An updated torque (denoted as M) can be obtained according to the external characteristic curve of the engine, wherein the ratio R _M of the updated torque to the maximum possible torque at the current speed is greater than the predetermined threshold in step 304 . The external characteristic curve of the engine can be further obtained, for example, by reading the CAN bus to obtain engine configuration information. FIG. 4 schematically shows the external characteristic curve of the engine.

According to the engine current power P _C and the update torque M obtained in step 302, the optimum speed (denoted as n) can be obtained as follows:

n=P _C /M (3)

In step 306, the current rotational speed of the engine is determined as the optimal rotational speed.

In step 307, the speed ratio between the optimal speed and the speed of the output shaft of the gearbox is calculated.

In one example, the rotational speed ratio between the optimal rotational speed and the rotational speed of the output shaft of the gearbox can be denoted as i, where i=n/n _o , and n _o is the rotational speed of the output shaft of the gearbox, which can be obtained, for example, from vehicle operating information.

In step 308, according to the configuration table of gear ratio constants of the gearbox, search for a set of candidate gears of the gearbox according to the rotational speed ratio obtained in step 307.

The gearbox gear speed ratio constant configuration table can be obtained, for example, from the description of the configuration information document when the vehicle leaves the factory, which describes the ratio of the input speed of the vehicle's gearbox (and the speed of the engine) to the output speed and the ratio of each gear. corresponding relationship. In one example, assume that the gearbox of the vehicle has 5 gears, wherein the gear ratio of the highest gear (for example, the 5th gear) is 1:1, and the 4th gear to the 1st gear are sequentially, for example, 1:1. 1.27, 1:1.27 ² , 1:1.27 ³ , 1:1.27 ⁴ .

Assuming that the speed ratio obtained in step 307 is 1:1.2, then in step 308, it can be obtained that the gear ratios of the 4th and 5th gears are relatively close to the speed ratio of 1:1.2, so the 4th gear can be and the 5th gear are added to the set of candidate gears as members of the set.

In step 309 , according to the gear ratio constant configuration table of the gearbox, the candidate rotational speed set of the engine is obtained from the gear candidate set of the gearbox.

First, the candidate rotational speeds corresponding to each candidate gear in the candidate gear set can be obtained according to the transmission gear ratio constant configuration table, and then these candidate rotational speeds can be used as members of the candidate rotational speed set.

In step 310, a rotational speed is selected from the set of candidate rotational speeds according to the optimum operating point curve of the engine.

In this step, the candidate rotational speed closest to the optimal operating point curve of the engine in the candidate rotational speed set may be determined first, and then the closest candidate rotational speed is selected from the candidate rotational speed set.

In step 311, the gear corresponding to the selected rotational speed in the set of candidate gears is determined as the best gear.

Since the candidate gear set and the candidate rotational speed set correspond one-to-one according to the gear ratio constant configuration table of the gearbox, according to the candidate rotational speed selected from the candidate rotational speed set in step 310, it is possible to determine the The corresponding candidate gear is determined as the best gear.

At step 312, the user is prompted for the best gear.

This step is similar to step 204 and will not be repeated here.

Then, the flow in Fig. 3 ends.

The shift prompt device and method of the present invention can be used in engine control systems, such as control systems of National III or above. All domestic commercial vehicles (trucks) at present have national iii and above national iii engine electronic control systems with CAN bus information exchange function, and all follow the regulation of SAE J1939 communication protocol, so the present invention has a wider scope of application. The invention can communicate with the engine ECU, the combination meter and the whole vehicle controller on the whole vehicle, and is used for combination meter information display and gearbox shift control.

The gear shift prompting device and method of the present invention can be used in vehicles with manual transmissions, and the gear shift prompting device and method of the present invention can prompt the driver in real time for the transmission gear with the best fuel economy under the current vehicle operating conditions , to prompt the driver to shift gears, so as to achieve the purpose of reducing fuel consumption. The shift prompt device of the present invention has a simple structure and can be realized without adding any sensor on the basis of the original complete vehicle. In addition, the gear shift prompting device and method of the present invention can output standard transmission gear position CAN bus information for use by other electronic control units on the vehicle.

The present invention can be implemented in hardware, firmware, software, or a combination of software and hardware. The hardware can be realized by application-specific integrated circuits and programmable logic controllers; the software part can be stored in memory and executed by an appropriate instruction execution system, such as a microprocessor, a personal computer (PC) or a mainframe.

It should be noted that in order to make the present invention easier to understand, the above description omits some more specific technical details that are known to those skilled in the art and may be necessary for the realization of the present invention.

The description of the present invention has been presented for purposes of illustration and description, not exhaustive or limited to the invention in the form disclosed. Many modifications and changes will be apparent to those of ordinary skill in the art.

Therefore, the embodiment is selected and described in order to better explain the principle of the present invention and its practical application, and to make those skilled in the art understand that all modifications and changes fall within the scope of the patent rights without departing from the essence of the present invention. within the scope of protection of the present invention as defined by the requirements.

Claims (10)

1. a gear shift prompting equipment, is characterized in that comprising:

Information collection apparatus, is configured to collect vehicle operating information;

Optimized rotating speed determining device, is connected with described information collection apparatus, is configured to the optimized rotating speed according to described vehicle operating information determination motor;

Best gear determining device, is connected with described optimized rotating speed determining device, is configured to the best gear determining the gearbox of described vehicle based on described optimized rotating speed; And

Suggestion device, is connected with described best gear determining device, is configured to point out described best gear to user,

Wherein said optimized rotating speed determining device comprises:

For obtaining the acquisition device of the acceleration of vehicle;

For the comparer of more described acceleration and acceleration rate threshold;

For calculating the computing device of the current power of described motor when described acceleration is greater than described acceleration rate threshold;

For calculating the computing device of the ratio of maximum possible moment of torsion under the current torque of described motor and current rotating speed;

For the current rotating speed of described motor being defined as when described ratio is more than or equal to predetermined threshold the determining device of optimized rotating speed; And

For obtaining the device of the optimized rotating speed of described motor when described ratio is less than predetermined threshold according to the current power of described motor and described renewal moment of torsion according to the renewal moment of torsion of the external characteristic curve determination motor of described motor, the ratio of wherein said renewal moment of torsion and described maximum possible moment of torsion is more than or equal to predetermined threshold.

2. equipment according to claim 1, is characterized in that, described information collection apparatus comprises:

For obtain following in one or more device: the universal characteristic curve of output shaft of gear-box rotating speed, engine speed, moment of torsion, the speed of a motor vehicle, motor, external characteristic curve, best effort point curve.

3. equipment according to claim 1, is characterized in that, described best gear determining device comprises:

Computing device, is configured to the ratio calculating described optimized rotating speed and output shaft of gear-box rotating speed;

Search device, be configured to, according to gearbox-gear speed ratio constant allocation list, search candidate's gear set of gearbox according to described ratio;

Acquisition device, is configured to, according to gearbox-gear speed ratio constant allocation list, obtain candidate's rotating speed set of motor from candidate's gear set of described gearbox;

Selection device, is configured to the best effort point curve according to motor, from the set of described candidate's rotating speed, select a rotating speed; And

Determining device, is configured to the gear corresponding with selected rotating speed in the set of described candidate's gear to be defined as best gear.

4. equipment according to claim 3, is characterized in that, described selection device comprises:

For determining the determining device with the immediate candidate's rotating speed of the best effort point curve of described motor in the set of described candidate's rotating speed; And

For selecting the selection device of determined candidate's rotating speed from the set of described candidate's rotating speed.

5. the equipment according to any one of claim 1-4, is characterized in that, described suggestion device comprises:

For the device of the described best gear of preferential display in information display.

6. a gear shift reminding method, comprising:

Collect vehicle operating information;

According to the optimized rotating speed of described vehicle operating information determination motor;

Based on described optimized rotating speed, determine the best gear of the gearbox of described vehicle; And

Described best gear is pointed out to user,

Wherein comprise according to the optimized rotating speed of described vehicle operating information determination motor:

Obtain the acceleration of vehicle;

More described acceleration and acceleration rate threshold, if described acceleration is greater than acceleration rate threshold, then

Calculate the current power of described motor,

Calculate the ratio of maximum possible moment of torsion under the current torque of described motor and current rotating speed,

When described ratio is more than or equal to predetermined threshold, the current rotating speed of described motor is defined as optimized rotating speed, and

When described ratio is less than predetermined threshold, according to the renewal moment of torsion of the external characteristic curve determination motor of described motor, and the optimized rotating speed of described motor is obtained according to the current power of described motor and described renewal moment of torsion, the ratio of wherein said renewal moment of torsion and described maximum possible moment of torsion is more than or equal to predetermined threshold.

7. method according to claim 6, wherein collect vehicle operating information and comprise: obtain following in one or more: the universal characteristic curve of output shaft of gear-box rotating speed, engine speed, moment of torsion, the speed of a motor vehicle, motor, external characteristic curve, best effort point curve.

8. method according to claim 6, wherein determine based on described optimized rotating speed that the best gear of the gearbox of described vehicle comprises:

Calculate the ratio of described optimized rotating speed and output shaft of gear-box rotating speed;

According to gearbox-gear speed ratio constant allocation list, search candidate's gear set of gearbox according to described ratio;

According to gearbox-gear speed ratio constant allocation list, obtain candidate's rotating speed set of motor from candidate's gear set of described gearbox;

According to the best effort point curve of motor, from the set of described candidate's rotating speed, select a rotating speed; And

The gear corresponding with selected rotating speed in the set of described candidate's gear is defined as best gear.

9. method according to claim 8, wherein according to the best effort point curve of motor, from the set of described candidate's rotating speed, select a rotating speed to comprise:

Determine candidate rotating speed immediate with the best effort point curve of described motor in the set of described candidate's rotating speed; And

Determined candidate's rotating speed is selected from the set of described candidate's rotating speed.

10. the method any one of claim 6-9, wherein point out described best gear to comprise to user:

The described best gear of preferential display in information display.