A new energy electric vehicle four-gear switching method

Abstract

The application discloses a four-gear switching method for a new energy electric vehicle. A four-gear shifter outputs four signals, namely, R-gear (reverse gear), N-gear (neutral gear), D-gear (economy forward gear) and S-gear (sport forward gear) signals. The method comprises the following steps: (1) the shifter is switched to R-gear, if the motor speed is less than a reference value I, and the brake opening degree signal is on and the brake state signal is in an on state, the gear state is set to R-gear, the gear effective flag is valid, and the gear switching does not alarm; (2) the shifter is switched to N-gear, and the gear state is immediately set to N-gear, if the gear signal is not received, the gear is set to N-gear by default; (3) the shifter is switched to D-gear, if the motor speed is greater than a reference value II, and the brake opening degree signal and the brake state signal exist, the gear state can be switched to D-gear; and (4) the shifter is switched to S-gear, if the motor speed is greater than the reference value II, and the brake opening degree signal and the brake state signal exist, the gear state is set to S-gear.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy electric vehicle gear shifting, in particular to a four-gear switching method for new energy electric vehicles. BACKGROUND

[0002] The rapid development of the automobile industry has brought a lot of convenience to people, but oil resources are decreasing and non-renewable, and environmental pollution is increasing. China is rich in electric power resources, and under the guidance of the state, a series of policies have been introduced to encourage and promote the development of new energy vehicles, so new energy electric vehicle technology has emerged as the times require.

[0003] Gear is an essential part of new energy electric vehicles, and is directly related to whether the vehicle can be driven normally and comfortably, so reasonable, compliant and simple gear shifting logic is particularly important. Most current new energy electric vehicles are three-gear (R (reverse gear), N (neutral gear), D (forward gear)), and the vehicle driving gear shifting strategy is designed on these three gears, but the three-gear switching logic strategy cannot be directly applied to four-gear (R (reverse gear), N (neutral gear), D (economy forward gear), S (sport forward gear)) electric vehicles, and a four-gear switching logic is needed to meet the vehicle driving requirements. SUMMARY

[0004] The purpose of the present application is to provide a four-gear switching method for new energy electric vehicles to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] A four-gear switching method for new energy electric vehicles, the four-gear shifter outputs four signals, R (reverse gear), N (neutral gear), D (economy forward gear), and S (sport forward gear) signals, including the following steps:

[0007] (1) The shifter is switched to R, if the motor speed < reference value I, the brake opening signal is turned on and the brake state signal is in the on state, the gear state is set to R, the gear valid flag is valid, and the gear switching is not alarmed;

[0008] Otherwise, the gear state is still set to N, and a gear valid flag invalid signal is sent, and a gear switching failure alarm is sent to the gear VCU (vehicle controller);

[0009] (2) The shifter is switched to N, the gear state is immediately set to N, and if no gear signal is received, it is defaulted to N;

[0010] (3) The shift lever is switched to D, if the motor speed > reference value II, there is brake opening signal and brake state signal, the gear state can be switched to D, the gear valid flag bit is sent to send valid signal, and the gear switching is not alarmed;

[0011] Otherwise, the gear state is still set to N, and the gear valid flag bit is sent to send invalid signal, and the gear switching failure alarm is sent to the gear VCU (vehicle controller) ;

[0012] (4) The shift lever is switched to S, if the motor speed > reference value II, there is brake opening signal and brake state signal, the gear state is set to S, the gear valid flag bit is valid, and the gear switching is not alarmed; Otherwise, the gear state is still set to N, and the gear valid flag bit is sent to send invalid signal, and the gear switching failure alarm is sent to the gear VCU (vehicle controller).

[0013] Further, when D and S are switched, the brake is not needed to be stepped on, and only the acceleration MAP is linearly switched.

[0014] Further, when any gear is switched to N, it can be directly switched without stepping on the brake;

[0015] Further, each time the gear is switched, the gear is switched according to the steps of stepping on the brake first and then shifting, otherwise the gear will be invalid, and the gear lever needs to return to N gear to reengage.

[0016] Further, the reference value I in the step (1) is 130 rpm.

[0017] Further, the reference value II in the step (2) is -130 rpm.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] 1. The gear switching logic is simple, which avoids too complex to cause the driving experience to decline;

[0020] 2. It has simple and direct alarm setting, reasonable and compliant gear shifting logic, which prevents misoperation from causing accidental gear switching to cause driving danger;

[0021] 3. It has good vehicle driving protection logic, which judges at a certain logic when the vehicle speed is high or the motor speed is high, and does not allow direct switching of the forward gear and the reverse gear, thereby protecting the power system and driving safety. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The logic switching schematic flowchart of the application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0024] Embodiment 1, please refer to Figure 1 :

[0025] The four-gear shifter outputs four signals, which are R (reverse gear), N (neutral gear), D (economy forward gear) and S (sport forward gear) signals.

[0026] The switching logic of the gears is as follows:

[0027] When the shifter is switched to the R gear, if the motor speed (MotorSpeed) is less than 130 rpm (a reference value, and a calibrated value is used for different vehicle models), the brake opening degree signal (BrakePedalValue_Reserve) is opened (1%-100%) and the brake state signal (BreakPaddelStatus) is in an opened state (BeakeOn), the gear state is set to the R gear, the gear valid flag (GearStatustValidFlag) is valid, and no gear switching alarm is given; otherwise, the gear state is still set to the N gear, the gear valid flag (GearStatustValidFlag) is sent to be invalid, and a gear switching invalid alarm (ShiftChageWarning) is sent to the gear VCU (vehicle controller).

[0028] When the shifter is switched to the N gear, the gear state is immediately set to the N gear, and the N gear is used by default if no gear signal is received.

[0029] When the shifter is switched to the D gear, if the motor speed (MotorSpeed) is greater than -130 rpm (a reference value, and a calibrated value is used for different vehicle models), the brake opening degree signal (BrakePedalValue_Reserve) and the brake state signal (BreakPaddelStatus) are present, the gear state can be switched to the D gear, the gear valid flag (GearStatustValidFlag) is sent to be valid, and no gear switching alarm is given; otherwise, the gear state is still set to the N gear, the gear valid flag (GearStatustValidFlag) is sent to be invalid, and a gear switching invalid alarm (ShiftChageWarning) is sent to the gear VCU (vehicle controller).

[0030] When the shift lever is switched to S, if the motor speed is greater than -130 rpm (reference value, different models use calibrated value), there is brake pedal value signal (BrakePedalValue_Reserve) and brake status signal (BreakPaddelStatus), the gear state is set to S, the gear valid flag (GearStatustValidFlag) is valid, and the gear shift warning is not reported; otherwise, the gear state is still set to N, and the gear valid flag (GearStatustValidFlag) is sent to the gear VCU (vehicle controller) to send a gear shift failure warning (ShiftChageWarning);

[0031] D and S do not need to be switched by pressing the brake, only the acceleration MAP linear switching;

[0032] Any gear shift to N can be directly switched without pressing the brake;

[0033] Each time the gear is switched, it needs to follow the steps of "1. press the brake 2. shift gears" to switch the gear, to prevent the driver from misplacing the gear, otherwise the gear will be invalid, and the gear lever needs to return to N to re-hang the gear.

[0034] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A four-gear switching method for a new energy electric vehicle, a four-gear shifter outputs four signals, respectively R gear (reverse gear), N gear (neutral gear), D gear (economy forward gear) and S gear (sport forward gear) signals, characterized in that, The method comprises the following steps: (1) The shift lever is switched to R, if the motor speed < reference value I, the brake opening signal is on and the brake state signal is in the on state, the gear state is set to R, the gear effective flag is valid, and the gear switching does not alarm; Otherwise, the gear state is still set to N, and the gear effective flag invalid signal is sent, and the gear switching failure alarm is sent to the gear VCU (vehicle controller); (2) The shift lever is switched to N, and the gear state is immediately set to N, and if the gear signal is not received, it is defaulted to N; (3) The shift lever is switched to D, if the motor speed > reference value II, there is a brake opening signal and a brake state signal, the gear state can be switched to D, the gear effective flag valid signal is sent, and the gear switching does not alarm; Otherwise, the gear state is still set to N, and the gear effective flag invalid signal is sent, and the gear switching failure alarm is sent to the gear VCU (vehicle controller); (4) The shift lever is switched to S, if the motor speed > reference value II, there is a brake opening signal and a brake state signal, the gear state is set to S, the gear effective flag is valid, and the gear switching does not alarm; Otherwise, the gear state is still set to N, and the gear effective flag invalid signal is sent, and the gear switching failure alarm is sent to the gear VCU (vehicle controller).

2. The four-gear switching method for new energy electric vehicles according to claim 1, characterized in that, When D and S are switched, the brake does not need to be stepped on, and only the acceleration MAP is linearly switched.

3. The four-gear switching method for new energy electric vehicles according to claim 1, characterized in that, When any gear is switched to N, it can be directly switched without stepping on the brake.

4. The four-gear switching method for new energy electric vehicles according to claim 1, characterized in that, Each time the gear is switched, the gear is switched according to the steps of stepping on the brake first and then shifting, otherwise the gear will be invalid, and the gear lever needs to return to N to reengage the gear.

5. The four-gear switching method for new energy electric vehicles according to claim 1, characterized in that, The reference value I in step (1) is 130 rpm.

6. A new energy electric vehicle four-gear switching method according to claim 1, characterized in that, The reference value II in step (2) is -130 rpm.

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