# US 9,868,356 B2 · Extended-range full-electric low-speed tractor

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

- Number: US 9,868,356 B2
- Document ID: US9868356B2
- Status: Granted
- Kind: B2
- Application number: 15/505,916
- Filed: 2016-09-09
- Published: 2017-12-14
- Granted: 2018-01-16
- Earliest claimed: 2015-09-11
- Assignees: Shenzhen Anshun Energy-saving Technology Development Co., Ltd
- Applicants: Shenzhen Anshun Energy-saving Technology Development Co., Ltd
- Inventors: Tonghui An; Kai Jia
- Web page: https://patentgrep.com/patent/US9868356B2

## CPC

- B60L 50/16: with provision for separate direct mechanical propulsion
- B60L 1/00: Supplying electric power to auxiliary equipment of vehicles (circuit arrangements for charging batteries H02J7/00)
- B60L 50/51: characterised by AC-motors
- B60L 50/62: charged by low-power generators primarily intended to support the batteries, e.g. range extenders
- B60L 58/20: having different nominal voltages
- B60L 2200/36: Vehicles designed to transport cargo, e.g. trucks
- B60L 2200/40: Working vehicles
- B60L 2210/12: Buck converters
- B60L 2210/14: Boost converters
- B60L 2210/30: AC to DC converters
- B60L 2210/40: DC to AC converters
- Y02P 90/60: Electric or hybrid propulsion means for production processes
- 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
- Y02T 10/72: Electric energy management in electromobility
- Y02T 10/92: Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
- Y02T 90/14: Plug-in electric vehicles
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Disclosed is an extended-range full-electric low-speed tractor, which includes a system control unit, a battery pack, a frequency conversion driver, a bidirectional DC-DC converter, a generating set and a drive system. The generating set is capable of working in an intermittent mode. The generating set will be started when the power of the battery pack is lower than a preset working range; once the generating set begins to work, the generating set will be running under a condition of “the most economic fuel consumption” and provide stable output at constant speed and constant power, so as to make sure that the generating set is not overloaded, emits no black smoke and has highest energy efficiency. It has advantages of low energy consumption, low pollution and long life of the generating set.

## Claims

### Claim 1

An extended-range full-electric low-speed tractor, wherein comprises a system control unit, a battery pack, a frequency conversion driver, a bidirectional DC-DC converter, a generating set and a drive system, the generating set comprising an engine and a generator connected to the engine, the frequency conversion driver comprising an AC/DC converter and a DC/AC bidirectional converter; wherein the generating set is connected to the AC/DC converter and then divided to two branch circuits, one being connected to the bidirectional DC-DC converter and the battery set in sequence via a DC bus and the other one being connected to the DC/AC bidirectional converter; the battery pack, the bidirectional DC-DC converter, the generating set and the frequency conversion driver are all signal controlled by the system control unit; the DC/AC bidirectional converter is connected to a load; a charging-discharging power of the battery set is greater than or equal to a power of the drive system; the drive system comprises a drive motor, a gearbox, a drive axle and a drive wheel, all of which are connected in sequence; and the DC/AC bidirectional converter is connected to the drive motor.

### Claim 2 (depends on 1)

The extended-range full-electric low-speed tractor according to claim 1, wherein the tractor further comprises an auxiliary power supply connected to the DC bus.

### Claim 3 (depends on 1)

The extended-range full-electric low-speed tractor according to claim 1, wherein the tractor further comprises a 24V DC power supply connected to the DC bus.