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Nissan used rapidpro system for engine control

the test project of using rapidpro hardware for engine control

successfully used in the on-board test of Nissan maxima

rapidpro system will be widely used in Nissan's R & D work

Japan's Nissan Motor Company uses the latest signal conditioning and power drive hardware rapidpro in its test project, As part of the complete rapid control prototype application scheme to control Nissan's famous VQ engine. The control function was immediately verified in Nissan Qianli. The pilot project is entirely based on dSPACE's hardware and software tool chain. Nissan will continue to use rapidpro system in its R & D projects according to the actual situation

nissan's VQ engine

in order to evaluate the signal conditioning and power drive characteristics of rapidpro system under real conditions, Nissan chose Qianlima as the test vehicle of the test project. Qianlima is driven by the latest 3.5lvq engine. VQ engine is the mainstream V6 engine model of Nissan, and has been selected as the "top ten engines in the world" of the authoritative American automobile magazine "Ward's auto world" for 11 consecutive years. Nissan's improvement of VQ engine is continuous. The engine has developed to the third generation and is equipped with a new engine management system (EMS). The EMS system supports a variety of different devices, such as continuous variable valve timing and variable intake system. The system reduces the redundancy of system functions (such as camshaft sensors) by reading multiple information from one sensor, so it can reduce the number of sensors required. Another feature of EMS system is the use of advanced air-fuel ratio mixture control strategy and λ The sensor effectively controls the emission performance

Nissan's VQ engine - for Nissan's Qianlima - was selected to be equipped with rapidpro in this test project

Nissan's rapid control prototype (RCP) system for VQ engine

in the fullpass control scheme for controlling VQ engine, Nissan uses dSPACE's microautobox rapid prototype, which is equipped with two sets of rapidpro signal conditioning units and a set of rapidpro power drive unit with appropriate signal conditioning and power drive modules. Rapidpro unit can be adapted to the sensor and actuator signals that microautobox needs to connect (as shown in the following figure). The engine controller model runs in microautobox, which has been verified in Nissan's last round of R & D projects. Use proven software tool chains: MATLAB/Simulink, dSPACE real time interface (RTI) for basic IO and extended engine control, and test software controldesk. Nissan's rapidpro hardware can be configured through the configuration terminal, and the new configuration software configurationdesk can configure the detailed parameters of the signal conditioning and driving module

"we are very satisfied with the result. This system works reliably and can start our engine quickly. To be honest, I am surprised that the rapidpro system can start the engine so easily and gently, because I once predicted that this project will be difficult to progress." Shigeaki Kakizaki, Nissan Motor Company, Japan

phased test plan

after designing the general scheme, The test plan is divided into four main stages:

· detailed design description and system configuration

· commissioning and real load test

· hardware in the loop test (HIL) on the test bench

· on-board test

stage 1: detailed design description and system configuration

in order to refine the design scheme, Nissan provides instructions for sensor input and actuator output, Through this description, you can select the appropriate rapidpro module, as shown in the table below. Then, dSPACE company configured the module according to the instructions and made the harness between the sensor/actuator and rapidpro and between rapidpro and microautobox. The designed system includes some reserved channels, which can connect additional sensors and actuators when the engine is improved in the future. The system configuration makes full use of all IO channels of microautobox

quantity module description typical application

1 sc-ai4/1

(4-channel differential analog input module) throttle position and pressure sensor signal (need to be amplified)

3 sc-ai10/1

(10 channel analog input module) accelerator pedal position, pressure sensor, temperature sensor, air mass flow sensor, Sensor power supply and battery voltage measurement

2 sc-di8/1

(8-channel digital input 1, amorphous feeding module) crankshaft/camshaft sensor, switch (such as braking, gear shifting, etc.)

1 sc-do8/1

(8-channel digital output module) relay, Ignition coil

1 sc-sens4/1

(4-channel sensor power supply module) supplies power to the sensor and ignition coil

1 ps-fbd2/1

(2-channel full axle drive module) throttle, tumble vortex control valve

5 ps-lsd6/1

(6-channel low-end drive module) evaporator relay, VVT solenoid valve, EGR stepping motor, fuel injector, Oxygen sensor heater

stage 2: commissioning and real load test

dSPACE will connect the real load of Nissan with rapidpro in the laboratory for preliminary test. The synchronization of crankshaft and camshaft, ignition and fuel injection signals are tested by hardware in the loop simulation system. These tests were conducted using pure excitation models running in microautobox. In the debugging stage of the system, especially in the aspect of bundle, a compact and easy to operate rapidpro interface box (Bob) is required. In terms of typical signal connection/disconnection, access to excitation signals, signal measurement, etc., rapidpro's special Bob has greater advantages than sub-d connector. If a wiring fault is found during commissioning, it can be directly rewired on Bob to correct the error. At the end of the debugging phase, the bob of rapidpro can be removed, and the correct harness can be directly connected to the rapid PRO system

stage 3: the hardware on the test bench is tested in the loop (HIL)

then, the rapidpro system arrives at Nissan and is connected to the existing DSL simulator of dSPACE for testing, which matches the actuator and sensor box of the real engine. In HIL test, rapi India will be the final configuration of dpro system in the world's fastest-growing country through software. For example, engineers can adjust the different thresholds of each channel of the 8-channel digital input module and the cut-off frequency of each channel of the 4-channel analog input module by configuring software. The whole system passed the test without any hardware changes. After successfully completing this stage, Nissan decided to conduct on-board test directly in Qianli

stage 4: on board test

after the rapidpro system is installed on the vehicle, the signal is tested under the two states of engine not running and engine running. Nissan tested all sensors and actuators to confirm the functionality, authenticity and noise of the signal. The input signal is tested by the instrument without oscilloscope for a long time, and compared with the model input signal tested by controldesk. Nissan engineers were trained in the fourth stage on how to use and configure the rapidpro system

nissan's rapidpro system experience

nissan's purpose is to evaluate the rapidpro prototype system and develop new engine control functions. Rapidpro is still in use and plays an important role. The rapidpro prototype is about to be replaced by the new version of rapidpro device. The control scheme of VQ engine will be expanded and added soon λ Control and knock detection. DSPACE will provide necessary modules for subsequent projects. Since the IO resources of microautobox have been fully utilized in the pilot project, rapidpro intelligent IO subsystem needs to be used to expand IO capacity. If the intelligent IO subsystem is used to process all IOS, either 2 In terms of terminology, users no longer need to make the harness between microautobox and rapidpro system, but only need to use high-speed serial communication interface for communication

shigeaki kakizaki

engine management system engineering department

Nissan Motor Company

Frank Sch ü TTE

Application Department

Germany dSPACE GmbH (end)

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