# US 2023/0264677 A1 · Charging control method and system for range extend electric vehicle, and electric vehicle

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2023/0264677 A1
- Document ID: US20230264677A1
- Status: Published application
- Kind: A1
- Application number: 18/006,435
- Filed: 2021-07-19
- Published: 2023-08-24
- Earliest claimed: 2020-07-23
- Assignees: Xiamen Yaxon Network Co., Ltd.
- Applicants: Xiamen Yaxon Network Co., Ltd
- Inventors: Yankai TU; Yuan CHEN
- Web page: https://patentgrep.com/patent/US20230264677A1

## CPC

- B60L 50/62: charged by low-power generators primarily intended to support the batteries, e.g. range extenders
- B60W 20/13: in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
- B60L 50/61: by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
- B60L 58/12: responding to state of charge [SoC]
- B60L 58/13: Maintaining the SoC within a determined range
- B60W 10/06: including control of combustion engines
- B60W 50/0097: {Predicting future conditions}
- B60L 2240/642: Slope of road
- B60L 2260/54: Energy consumption estimation
- B60W 2510/0666: Engine power
- B60W 2510/244: Charge state
- B60W 2530/10: Weight
- B60W 2552/05: Type of road, e.g. motorways, local streets, paved or unpaved roads
- B60W 2555/60: Traffic rules, e.g. speed limits or right of way
- B60W 2710/0677: Engine power
- Y02T 10/62: Hybrid vehicles
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Disclosed are a charging control method and system for a range extend electric vehicle, and the electric vehicle. The control method includes: presetting a first threshold value and a second threshold value and executing the following steps: when the electric quantity of a battery is lower than the second threshold value, performing forced charging on the battery; when the electric quantity of the battery is lower than the first threshold value and higher than the second threshold value, proceeding to a subsequent step to determine whether Pv+Pb1>Pu is met, Pv, Pb1 and Pu respectively representing current vehicle driving required power, minimum required charging power of the battery and maximum power of a high efficiency running range of an engine; if not, determining the time as an optimal charging time, controlling the engine to increase the power to Pu, and charging the battery with a power of Pu−Pv; and if so, skipping performing charging, and predicting an optimal charging time for charging according to a terrain condition or road environment ahead. On the basis of the above charging control method, the optimal charging time of the range extend electric vehicle can be predicted, ensuring that the engine runs in a high efficiency power range while charging the battery, and achieving better economic efficiency.

## Claims

### Claim 1

A charging control method for a range extend electric vehicle, comprising: presetting a first threshold value and a second threshold value, the first threshold value being greater than the second threshold value; and executing the following steps:
(1) detecting, by a controller, an electric quantity of a battery;
(2) determining, by the controller, an electric quantity of the battery, when the electric quantity of the battery is lower than the first threshold value and higher than the second threshold value, proceeding to a next step, and when the electric quantity of the battery is lower than the second threshold value, controlling, by the controller, the battery to be forcibly charged and returning to step (1) upon completion of charging;
(3) determining, by the controller, whether Pv+Pb1>Pu is met, Pv, Pb1 and Pu respectively representing current vehicle driving required power, minimum required charging power of the battery and maximum power of a high efficiency running range of an engine; when Pv+Pb1>Pu is not met, determining a time as an optimal charging time, controlling the engine to increase power to Pu, charging the battery with a power of Pu−Pv, and returning to step (1) upon completion of charging; and when Pv+Pb1>Pu is met, skipping performing charging and proceeding to the next step; and
(4) predicting an optimal charging time according to a terrain condition or a road environment ahead, performing charging at the optimal charging time, and returning to step (1) upon completion of charging.

### Claim 2 (depends on 1)

The charging control method for a range extend electric vehicle according to claim 1, wherein, in step (4), the controller predicts predicted required power Pv′ for vehicle driving in the terrain condition or the road environment ahead, and determines whether Pv′+Pb1>Pu is met, when Pv′+Pb1>Pu is not met, a time when the vehicle reaches a road ahead and Pv′+Pb1<Pu is met is the optimal charging time, and charging starts; otherwise, charging is not performed.

### Claim 3 (depends on 2)

The charging control method for a range extend electric vehicle according to claim 2, wherein in the case that the optimal charging time does not occur in the terrain condition or the road environment ahead, when the electric quantity of the battery is lower than the second threshold value, the controller controls the battery to be forcibly charged to the first threshold value.

### Claim 4 (depends on 2)

The charging control method for a range extend electric vehicle according to claim 2, wherein in the case that the terrain condition or the road environment ahead has a slope change, the predicted required power Pv′ is estimated as follows:
(1) reading a current engine load percentage value N, N being a percentage of current power to maximum power Wmax of the engine, and acquiring a current slope value θ0 and a slope ahead value θi from an electronic horizon; and
(2) assuming that the vehicle travels in a similar state and a speed is V, at a road segment ahead with the slope ahead value θi, when a predicted load percentage of the engine is Ni′, calculating to obtain the predicted required power Pv′=Ni′Wmax.

### Claim 5 (depends on 4)

The charging control method for a range extend electric vehicle according to claim 4, wherein a traction change caused by the slope is: Fs=mg sin(θi−θ0)≈mg(θi−θ0);
a power change is: P=mgV(θi−θ0); and
the predicted load percentage of the engine is: Ni′=N+mgV(θi−θ0)/Wmax,
wherein m is a mass of the vehicle, and g is an acceleration of gravity.

### Claim 6 (depends on 5)

The charging control method for a range extend electric vehicle according to claim 5, wherein in the case that the terrain condition or the road environment ahead has a speed limit change, and speed limit information of a point j ahead acquired from the electronic horizon is Vj, the speed is replaced by Vj, correspondingly, the predicted load percentage Nj′ is: Nj′=N+mgVj(θi−θ0)/Wmax, and the predicted required power is: Pv′=Nj′Wmax.

### Claim 7 (depends on 5)

The charging control method for a range extend electric vehicle according to claim 5, wherein in the case that the terrain condition or the road environment ahead has curve information, and a turning radius and a turning angle of a point k ahead acquired from the electronic horizon are Rk and αk,
a turning resistance coefficient fr in an ideal state is: fr=(V2/Rg)a;
a power increased by the curve is:
P
=
mgVf
r
=
a
k
⁢
mV
3
R
k
;
a total increased power is:
mgV
j
(
θ
i
-
θ
0
)
+
a
k
⁢
mV
j
3
R
k
,
and
N
k
′
=
N
+
[
mgV
j
(
θ
i
-
θ
0
)
+
a
k
⁢
mV
j
3
R
k
]
/
W
max
;
the predicted required power is Pv′=Ni′Wmax,
wherein R is a turning radius, and a is a turning angle.

### Claim 8 (depends on 1)

A charging control system for a range extend electric vehicle, comprising an engine, a generator, an electric motor, a battery, and a controller, the generator being connected to the electric motor, the battery and the engine, the controller being connected to the engine and the generator, wherein the controller is further connected to an electronic horizon system to acquire a terrain condition or a road environment ahead of the range extend electric vehicle, and controls the engine to drive the generator to charge the battery by using the charging control method for the range extend electric vehicle according to claim 1.

### Claim 9 (depends on 8)

A range extend electric vehicle comprising a vehicle body, further comprising the charging control system for the range extend electric vehicle according to claim 8, mounted in the vehicle body.